#!/usr/bin/env perl
# -*-mode:cperl; indent-tabs-mode: nil; cperl-indent-level: 4-*-

## Script to control Bucardo
##
## Copyright 2006-2015 Greg Sabino Mullane <greg@endpoint.com>
##
## Please see http://bucardo.org/ for full documentation
##
## Run with a --help argument for some basic instructions

package bucardo;

use strict;
use warnings;
use utf8;
use 5.008003;
use open qw( :std :utf8 );
use DBI;
use IO::Handle      qw/ autoflush /;
use File::Basename  qw/ dirname /;
use Time::HiRes     qw/ sleep gettimeofday tv_interval /;
use POSIX           qw/ ceil setsid localeconv /;
use Config          qw/ %Config /;
use Encode          qw/ decode /;
use File::Spec;
use Data::Dumper    qw/ Dumper /;
$Data::Dumper::Indent = 1;
use Getopt::Long;
Getopt::Long::Configure(qw/ no_ignore_case pass_through no_autoabbrev /);

require I18N::Langinfo;

our $VERSION = '5.4.1';

## For the tests, we want to check that it compiles without actually doing anything
return 1 if $ENV{BUCARDO_TEST};

## No buffering on the standard streams
*STDOUT->autoflush(1);
*STDERR->autoflush(1);

my $locale = I18N::Langinfo::langinfo(I18N::Langinfo::CODESET());

for (@ARGV) {
    $_ = decode($locale, $_);
}

## All the variables we use often and want to declare here without 'my'
use vars qw/$dbh $SQL $sth %sth $count $info %global $SYNC $GOAT $TABLE $SEQUENCE $DB $DBGROUP $HERD $RELGROUP
            $CUSTOMCODE $CUSTOMNAME $CUSTOMCOLS $CLONE /;

## How to show dates from the database, e.g. start time of a sync
my $DATEFORMAT       = $ENV{BUCARDO_DATEFORMAT} || q{Mon DD, YYYY HH24:MI:SS};
my $SHORTDATEFORMAT  = $ENV{BUCARDO_SHORTDATEFORMAT} || q{HH24:MI:SS};

## How long (in seconds) we hang out between checks after a kick - or when waiting for notices
my $WAITSLEEP = 1;

## Determine how we were called
## If we were called from a different directory, and the base directory is in our path,
## we strip out the directory part
my $progname = $0;
if (exists $ENV{PATH} and $progname =~ m{(.+)/(.+)}) {
    my ($base, $name) = ($1,$2);
    for my $seg (split /\:/ => $ENV{PATH}) {
        if ($seg eq $base) {
            $progname = $name;
            last;
        }
    }
}

## We must have at least one argument to do anything
help(1) unless @ARGV;

## Default arguments - most are for the bc constructor
my $bcargs = {
              quiet        => 0,
              verbose      => 0,
              quickstart   => 0,
              bcverbose    => 1,
              dbname       => 'bucardo',
              dbuser       => 'bucardo',
              dbpass       => undef,
              sendmail     => 0,
              extraname    => '',
              logseparate  => 0,
              logextension => '',
              logclean     => 0,
              batch        => 0,
          };

## These options must come before the main GetOptions call
my @opts = @ARGV;
GetOptions(
    $bcargs,
    'no-bucardorc',
    'bucardorc=s',
);

## Values are first read from a .bucardorc, either in the current dir, or the home dir.
## If those do not exist, check for a global rc file
## These will be overwritten by command-line args.
my $file;
if (! $bcargs->{'no-bucardorc'}) {
    if ($bcargs->{bucardorc}) {
        -e $bcargs->{bucardorc} or die qq{Could not find the file "$bcargs->{bucardorc}"\n};
        $file = $bcargs->{bucardorc};
    }
    elsif (-e '.bucardorc') {
        $file = '.bucardorc';
    }
    elsif (defined $ENV{HOME} && -e "$ENV{HOME}/.bucardorc") {
        $file = "$ENV{HOME}/.bucardorc";
    }
    elsif (-e '/etc/bucardorc') {
        $file = '/etc/bucardorc';
    }
}
if (defined $file) {
    open my $rc, '<', $file or die qq{Could not open "$file": $!\n};
    while (<$rc>) {

        ## Skip any lines starting with a hash
        next if /^\s*#/;

        ## Format is foo=bar or foo:bar, with whitespace allowed
        if (/^\s*(\w[\w-]+)\s*[:=]\s*(.+?)\s*$/o) {
            my ($name,$value) = ($1,$2); ## no critic (ProhibitCaptureWithoutTest)
            $bcargs->{$name} = $name eq 'logdest' ? [$value] : $value;
        }
        else {
            warn qq{Could not parse line $. of file "$file"\n};
        }

    }
    close $rc or die;
}

Getopt::Long::Configure(qw(no_pass_through autoabbrev));
GetOptions ## no critic (ProhibitCallsToUndeclaredSubs)
    ($bcargs,
     'verbose+',
     'vv',
     'vvv',
     'vvvv',
     'quiet+',
     'quickstart',
     'notimer',
     'help|?',
     'debug!',
     'version',
     'sort=i',
     'showdays|show-days',
     'compress',
     'retry=i',
     'retrysleep|retry-sleep=i',
     'batch',
     'dryrun|dry-run',
     'confirm',
     'tsep=s',
     'exit-on-nosync!',

     ## These are sent to the constructor:
     'bcverbose',
     'dbport|db-port|p=i',
     'dbhost|db-host|h=s',
     'dbname|db-name|d=s',
     'dbuser|db-user|U=s',
     'dbpass|db-pass|P=s',
     'sendmail=i',
     'extraname|extra-name=s',

     'debugsyslog=i', # legacy
     'debugdir=s',    # legacy
     'debugfile=i',   # legacy
     'cleandebugs=i', # legacy


     'logdest|log-dest|log-destination=s@', # stderr, syslog, or file path
     'logseparate|log-sep|log-separate|debugfilesep!',
     'logextension|log-extension|log-ext|debugname=s',
     'logclean|log-clean!',

     ## Used internally
     'force',
     'schema|n=s@',
     'exclude-schema|N=s@',
     'table|t=s@',
     'exclude-table|T=s@',
     'db|database=s',
     'herd|relgroup=s',
     'piddir|pid-dir=s',
) or die "\n";

## If --help is set, ignore everything else, show help, then exit
help() if $bcargs->{help};

## If --version is set, ignore everything else, show the version, and exit
if ($bcargs->{version}) {
    print "$progname version $VERSION\n";
    exit 0;
}

## Allow some options to be set by env
if ($ENV{BUCARDO_CONFIRM} and ! exists $bcargs->{confirm}) {
    $bcargs->{confirm} = $ENV{BUCARDO_CONFIRM};
}

# Determine the logging destination.
if (exists $bcargs->{logdest}) {
    if (! ref $bcargs->{logdest}) {
        $bcargs->{logdest} = [$bcargs->{logdest}];
    }
}
else {
    if (exists $bcargs->{debugfile} && !delete $bcargs->{debugfile}) {
        # Old --debugfile option can disable logging.
        $bcargs->{logdest} = [];
    }
    elsif (my $dir = $bcargs->{debugdir}) {
        # Old --debugdir option determines log directory.
        $bcargs->{logdest} = [$dir];
    }
    else {
        # Default value.
        $bcargs->{logdest} = ['/var/log/bucardo'];
    }

    if ($bcargs->{debugsyslog}) {
        # Old --debugsyslog option enables syslog logging.
        push @{ $bcargs->{logdest} } => 'syslog';
    }
}

# Handle legacy --cleandebugs option.
$bcargs->{logclean} = 1
    if delete $bcargs->{cleandebugs} && !exists $bcargs->{logclean};

## Sometimes we want to be as quiet as possible
my $QUIET = delete $bcargs->{quiet};

## Quick shortcuts for lots of verbosity
$bcargs->{vv} and $bcargs->{verbose} = 2;
$bcargs->{vvv} and $bcargs->{verbose} = 3;
$bcargs->{vvvv} and $bcargs->{verbose} = 4;

## Set some global arguments
my $VERBOSE = delete $bcargs->{verbose};
my $DEBUG   = delete $bcargs->{debug} || $ENV{BUCARDO_DEBUG} || 0;

## Do we compress time outputs by stripping out whitespace?
my $COMPRESS = delete $bcargs->{compress} || 0;

## Do we retry after a sleep period on failed kicks?
my $RETRY      = delete $bcargs->{retry} || 0;
my $RETRYSLEEP = delete $bcargs->{retrysleep} || 0;

## Allow people to turn off the cool timer when kicking syncs
my $NOTIMER = delete $bcargs->{notimer} || 0;

## Anything left over is the verb and noun(s)
my $verb = shift || '';

## No verb? Show a help message and exit
help(1, "Missing required command\n") unless $verb;

## Standardize the verb as lowercase, and grab the rest of the args as the "nouns"
$verb = lc $verb;
my @nouns = @ARGV;

## Allow alternate underscore format
if ($verb =~ /^(\w+)_(\w+)$/) {
    $verb = $1;
    unshift @nouns => $2;
}

## Make a single string version, mostly for output in logs
my $nouns = join ' ' => @nouns;
## The verb may have a helper, usually a number
my $adverb;

## Installation must happen before we try to connect!
install() if $verb =~ /instal/i;

## Display more detailed help than --help
superhelp() if $verb eq 'help';

my ($STOPFILE,$REASONFILE,$REASONFILE_LOG);

## If we are trying a stop, and piddir is already set, do it now
if ('stop' eq $verb and $bcargs->{piddir}) {
    $STOPFILE = "$bcargs->{piddir}/fullstopbucardo";
    $REASONFILE = 'bucardo.restart.reason.txt';
    $REASONFILE_LOG = 'bucardo.restart.reason.log';
    stop();
}

## For everything else, we need to connect to a previously installed Bucardo database

## Create a quick data source name
my $DSN = "dbi:Pg:dbname=$bcargs->{dbname}";
$bcargs->{dbhost} and length $bcargs->{dbhost} and $DSN .= ";host=$bcargs->{dbhost}";
$bcargs->{dbport} and length $bcargs->{dbport} and $DSN .= ";port=$bcargs->{dbport}";

## Connect to the database
$dbh = DBI->connect($DSN, $bcargs->{dbuser}, $bcargs->{dbpass}, {AutoCommit=>0,RaiseError=>1,PrintError=>0});

## We only want to concern ourselves with things in the bucardo schema
$dbh->do('SET search_path = bucardo');

## Make sure we find a valid Postgres version
## Why do we check this after a successful install?
## In case they get pg_dumped to a different (older) database. It has happened! :)
check_version($dbh); ## dies on invalid version

## Listen for the MCP. Not needed for old-school non-payload LISTEN/NOTIFY, but does no harm
$dbh->do('LISTEN bucardo');
$dbh->commit();

## Set some global variables based on information from the bucardo_config table

## The reason file records startup and shutdown messages
$REASONFILE = get_config('reason_file');
($REASONFILE_LOG = $REASONFILE) =~ s{(?:[.][^.]+)?$}{.log};

## The directory Bucardo.pm writes PID and other information to
my $PIDDIR = $bcargs->{piddir} || get_config('piddir');

## The PID file of the master control file (MCP)
## If this exists, it is a good bet that Bucardo is currently running
my $PIDFILE = "$PIDDIR/bucardo.mcp.pid";

## The stop file whose existence tells all Bucardo processes to exit immediately
my $stopfile = get_config('stopfile');
$STOPFILE = "$PIDDIR/$stopfile";

## Aliases for terms people may shorten, misspell, etc.
## Mostly used for database columns when doing an 'update'
our %alias = (
    'ssp'                 => 'server_side_prepares',
    'server_side_prepare' => 'server_side_prepares',
    'port'                => 'dbport',
    'host'                => 'dbhost',
    'name'                => 'dbname',
    'user'                => 'dbuser',
    'pass'                => 'dbpass',
    'password'            => 'dbpass',
    'service'             => 'dbservice',
);

## Columns that cannot be changed: used in the update_* subroutines
my %column_no_change = (
    'id'    => 1,
    'cdate' => 1,
);

## Regular expression for a valid dbgroup name
my $re_dbgroupname = qr{\w[\w\d]*};

## Regular expression for a valid database name
my $re_dbname = qr{\w[\w\d]*};

## Send a ping to the MCP to make sure it is alive and responding
ping() if $verb eq 'ping';

## Make sure the Bucardo database has the latest schema
upgrade() if $verb =~ /^upgr/ or $verb eq 'uprgade' or $verb eq 'ugprade';

## All the rest of the verbs require use of global information
## Thus, we load everything right now
load_bucardo_info();

## View the status of one or more syncs
status_all()    if $verb eq 'status' and ! @nouns;
status_detail() if $verb eq 'status';

## Stop, start, or restart the main Bucardo daemon
stop()          if $verb eq 'stop';
start()         if $verb eq 'start' or $verb eq 'strt';
restart()       if $verb eq 'restart';

## Reload the configuration file
reload_config() if $verb eq 'reload' and defined $nouns[0] and $nouns[0] eq 'config';

## Reload the mcp (if args, we want reload_sync)
reload() if $verb eq 'reload' and ! defined $nouns[0];

# Reopen the log files
reopen()        if $verb eq 'reopen';

## Show information about something: database, table, sync, etc.
list_item()     if $verb eq 'list' or $verb eq 'l' or $verb eq 'lsit' or $verb eq 'liast'
    or $verb eq 'lisy' or $verb eq 'lit';

## Add something
add_item()      if $verb eq 'add';

## Remove something
remove_item()   if $verb eq 'remove' or $verb eq 'delete' or $verb eq 'del';

## Update something
update_item()   if $verb eq 'update' or $verb eq 'upd' or $verb eq 'udpate';

## Inspect something
inspect()       if $verb eq 'inspect';

## Inject a message into the Bucardo logs
message()       if $verb eq 'message' or $verb eq 'msg';

## Show or set an item from the bucardo.config table
config()        if $verb eq 'set' or $verb eq 'show' or $verb eq 'config';

## Validate a sync
validate()      if $verb =~ /^vali/;

## Purge the delta/track tables
purge()         if $verb eq 'purge';

## Clone a database
clone()         if $verb eq 'clone';

## View delta statistics
count_deltas()  if $verb eq 'delta' or $verb eq 'deltas';

## There are only a few valid verbs left, so we check for them now
if ($verb ne 'kick' and $verb ne 'activate' and $verb ne 'deactivate'
    and $verb ne 'reload'
        and $verb ne 'pause' and $verb ne 'resume') {
    ## Show help and exit
    help(1, qq{Unknown command "$verb"\n});
}

## For all remaining verbs, we expect a list of syncs with an optional decimal "timeout"

## If there are no syncs, no sense in going on!
if (! keys %$SYNC) {
    die qq{No syncs have been created yet!\n};
}

## The final list of syncs we are going to do something to
my @syncs;

## The fail msg on a non-match
my $msg;

## Loop through each noun and handle it
SYNCMATCH: for my $sync (@nouns) {

    ## Quick skipping of noise word 'sync'
    next if $sync =~ /^syncs?$/;

    ## If this is a number, it's a timeout, so set it and skip to the next noun
    if ($sync =~ /^\d+$/) {
        $adverb = $sync;
        next SYNCMATCH;
    }

    ## If they want all syncs, grab them all and stop reading any more nouns
    if ($sync eq 'all') {
        undef @syncs;
        for my $name (sort keys %$SYNC) {
            push @syncs => $name;
        }
        last SYNCMATCH;
    }

    ## The rest are all ways of finding the sync they want
    ## Change the name to a Perl-regex friendly form
    (my $term = $sync) =~ s/%/\*/g;
    $term =~ s/([^\.])\*/$1.*/g;
    $term =~ s/^\*/.*/;

    if ($term =~ /\*/) {
        for my $name (sort keys %$SYNC) {
            push @syncs => $name if $name =~ /^$term$/;
        }
        next SYNCMATCH;
    }

    ## Now that wildcards are out, we must have an absolute match
    if (! exists $SYNC->{$sync}) {
        $msg = qq{Sync "$sync" does not appear to exist\n};
        ## No sense in going on
        last SYNCMATCH;
    }

    ## Got a direct match, so store it away
    push @syncs => $sync;

}

## If syncs is empty, a regular expression search failed
if (!@syncs) {
    $msg = qq{No matching syncs were found\n};
}

## If we have a message, something is wrong
if (defined $msg) {
    ## Be nice and print a list of active syncs
    my @goodsyncs;
    for my $s (sort keys %$SYNC) {
        push @goodsyncs => $s if $SYNC->{$s}{status} eq 'active';
    }
    if (@goodsyncs) {
        $msg .= "Active syncs:\n";
        $msg .= join "\n" => map { " $_" } @goodsyncs;
    }
    die "$msg\n";
}

## Activate or deactivate one or more syncs
vate_sync() if $verb eq 'activate' or $verb eq 'deactivate';

## Kick one or more syncs
kick() if $verb eq 'kick';

## Pause or resume one or more syncs
pause_resume($verb) if $verb eq 'pause' or $verb eq 'resume';

## Reload one or more syncs
reload_sync() if $verb eq 'reload';


## If we reach here (and we should not), display help and exit
help(1);

exit;

## Everything from here on out is subroutines


sub get_config {

    ## Given a name, return the matching value from the bucardo_config table
    ## Arguments: one
    ## 1. setting name
    ## Returns: bucardo_config.value string

    my $name = shift;

    $SQL = 'SELECT setting FROM bucardo.bucardo_config WHERE LOWER(name) = ?';
    $sth = $dbh->prepare_cached($SQL);
    $count = $sth->execute(lc $name);
    if ($count < 1) {
        $sth->finish();
        die "Invalid bucardo_config setting: $name\n";
    }
    return $sth->fetchall_arrayref()->[0][0];

} ## end of get_config


sub numbered_relations {

    ## Sorting function
    ## Arguments: none (implicit $a / $b via Perl sorting)
    ## Returns: winning value
    ## Sorts relations of the form schema.table
    ## in which we do alphabetical first, but switch to numeric order
    ## for any numbers at the end of the schema or the table
    ## Thus, public.foobar1 will come before public.foobar10

    ## Pull in the names to be sorted, dereference as needed
    my $uno = ref $a ? "$a->{schemaname}.$a->{tablename}" : $a;
    my $dos = ref $b ? "$b->{schemaname}.$b->{tablename}" : $b;

    ## Break apart the first item into schema and table
    die if $uno !~ /(.+)\.(.+)/;
    my ($schema1,$sbase1,$table1,$tbase1) = ($1,$1,$2,$2);
    ## Store ending numbers if available: if not, use 0
    my ($snum1, $tnum1) = (0,0);
    $sbase1 =~ s/(\d+)$// and $snum1 = $1;
    $tbase1 =~ s/(\d+)$// and $tnum1 = $1;

    ## Break apart the second item into schema and table
    die if $dos !~ /(.+)\.(.+)/;
    my ($schema2,$sbase2,$table2,$tbase2) = ($1,$1,$2,$2);
    my ($snum2, $tnum2) = (0,0);
    $sbase2 =~ s/(\d+)$// and $snum2 = $1;
    $tbase2 =~ s/(\d+)$// and $tnum2 = $1;

    return (
        $sbase1 cmp $sbase2
     or $snum1 <=> $snum2
     or $tbase1 cmp $tbase2
     or $tnum1 <=> $tnum2);

} ## end of numbered_relations


sub check_version {

    ## Quick check that we have the minumum supported version
    ## This is for the bucardo database itself
    ## Arguments: one
    ## 1. Database handle
    ## Returns: undef (may die if the version is not good)

    my $dbh = shift;
    my $res = $dbh->selectall_arrayref('SELECT version()')->[0][0];
    if ($res !~ /(\d+)\.(\d+)/) {
        die "Sorry, unable to determine the database version\n";
    }
    my ($maj,$min) = ($1,$2);
    if ($maj < 8 or (8 == $maj and $min < 1)) {
        die "Sorry, Bucardo requires Postgres version 8.1 or higher. This is only $maj.$min\n";
    }

    return;

} ## end of check_version

sub _pod2usage {
    require Pod::Usage;
    Pod::Usage::pod2usage(
        '-verbose' => 99,
        '-exitval' => 2,
        @_
    );
    return;
}

sub help {

    my ($exitval, $message) = @_;

    ## Give detailed help about usage of this program
    ## Arguments: none
    ## Returns: never, always exits

    ## Nothing to do if we are being quiet
    exit 0 if $QUIET;

    _pod2usage(
        '-message'  => $message,
        '-sections' => '^(?:USAGE|COMMANDS|OPTIONS)$',
        '-exitval'  => $exitval || 0,
    );

    return;

} ## end of help

sub superhelp {

    ## Show detailed help by examining the verb and nouns
    ## Arguments: none
    ## Returns: never, always exits

    ## If there are no nouns, we can only show the generic help
    help() if ! @nouns;

    # Make sure all commands and actions, as well as their aliases, are here.
    my %names = (
        ( map { $_ => 'relgroup' } qw(relgroup herd) ),
        ( map { $_ => 'db'       } qw(db database) ),
        ( map { $_ => 'list'     } qw(l lsit liast lisy lit) ),
        ( map { $_ => 'upgrade'  } qw(upgrade uprgade ugprade) ),
        ( map { $_ => 'start'    } qw(start strt) ),
        ( map { $_ => 'remove'   } qw(remove delete del) ),
        ( map { $_ => 'update'   } qw(update upd udpate) ),
        map { $_ => $_ } qw(
            activate
            add
            all
            config
            customcode
            customcols
            customname
            dbgroup
            deactivate
            delta
            help
            inspect
            install
            kick
            list
            message
            ping
            purge
            reload
            reload
            restart
            sequence
            sequences
            set
            show
            status
            stop
            sync
            table
            tables
            validate
        ),
    );

    # Standardize names.
    my @names;
    for my $noun (@nouns) {
        push @names => $names{ lc $noun } || $names{ standardize_name($noun) }
            || help( 1, 'Unknown command: ' . join ' ' => @nouns );
    }

    my @command = ($names[0]);
    if (@names > 1) {
        ## Actions are documented in Pod as "=head3 $action $command".
        push @command, join ' ', @names;
    }
    else {
        ## Don't show subsections for commands that have them.
        push @command, => '!.+' if $names[0] eq 'add' || $names[0] eq 'update';
    }
    usage_exit(join('/' => @command), 0);

    return;

} ## end of superhelp


sub ping {

    ## See if the MCP is alive and responds to pings
    ## Default is to wait 15 seconds
    ## Arguments: none, but looks in @nouns for a timeout
    ## Returns: never, exits

    ## Set the default timeout, but override if any remaining args start with a number
    my $timeout = 15;
    for (@nouns) {
        if (/^(\d+)/) {
            $timeout = $1;
            last;
        }
    }

    $VERBOSE and print "Pinging MCP, timeout = $timeout\n";
    $dbh->do('LISTEN bucardo_mcp_pong');
    $dbh->do('NOTIFY bucardo_mcp_ping');
    $dbh->commit();
    my $starttime = time;
    sleep 0.1;

    ## Loop until we timeout or get a confirmation from the MCP
  P:{
        ## Grab any notices that have come in
        my $notify = $dbh->func('pg_notifies');
        if (defined $notify) {
            ## Extract the PID that sent this notice
            my ($name, $pid, $payload) = @$notify;
            ## We are done: ping successful
            $QUIET or print "OK: Got response from PID $pid\n";
            exit 0;
        }

        ## Rollback, sleep, and check for a timeout
        $dbh->rollback();
        sleep 0.5;
        my $totaltime = time - $starttime;
        if ($timeout and $totaltime >= $timeout) {
            ## We are done: ping failed
            $QUIET or print "CRITICAL: Timed out ($totaltime s), no ping response from MCP\n";
            exit 1;
        }
        redo;
    }

    return;

} ## end of ping


sub start {

    ## Attempt to start the Bucardo daemon
    ## Arguments: none
    ## Returns: undef

    ## Write a note to the 'reason' log file
    ## This will automatically write any nouns in as well
    append_reason_file('start');

    ## Refuse to go on if we get a ping response within 5 seconds
    $QUIET or print "Checking for existing processes\n";

    ## We refuse to start if the MCP PID file exists and looks valid
    if (-e $PIDFILE) {
        open my $fh, '<', $PIDFILE or die qq{Could not open "$PIDFILE": $!\n};
        my $pid = <$fh> =~ /(\d+)/ ? $1 : 0;
        close $fh or warn qq{Could not close $PIDFILE: $!\n};

        $msg = qq{Cannot start, PID file "$PIDFILE" exists\n};
        if (!$pid) {
            warn qq{File "$PIDFILE" does not start with a PID!\n};
        }
        else {
            ## We have a PID, see if it is still alive
            my $res = kill 0 => $pid;
            if (0 == $res) {
                warn qq{Removing file "$PIDFILE" with stale PID $pid\n};
                unlink $PIDFILE;
                $msg = '';
            }
        }

        if ($msg) {
            $QUIET or print $msg;

            append_reason_file('fail');

            exit 1;
        }
    }

    ## Verify that the version in the database matches our version
    my $dbversion = get_config('bucardo_version')
        or die "Could not find Bucardo version!\n";
    if ($dbversion ne $VERSION) {
        my $message = "Version mismatch: bucardo is $VERSION, but bucardo database is $dbversion\n";
        append_reason_file('fail');
        warn $message;
        warn "Perhaps you need to run 'bucardo upgrade' ?\n";
        exit 1;
    }

    ## Create a new Bucardo daemon
    ## If we are a symlink, put the source directory in our path
    if (-l $progname and readlink $progname) {
        my $dir = dirname( readlink $progname );
        unshift @INC, $dir;
    }
    require Bucardo;
    $bcargs->{exit_on_nosync} = delete $bcargs->{'exit-on-nosync'}
        if exists $bcargs->{'exit-on-nosync'};
    my $bc = Bucardo->new($bcargs);

    ## Verify that the version of Bucardo.pm matches our version
    my $pm_version = $bc->{version} || 'unknown';
    if ($VERSION ne $pm_version) {
        my $message = "Version mismatch: bucardo is $VERSION, but Bucardo.pm is $pm_version\n";
        append_reason_file('fail');
        die $message;
    }

    my $had_stopfile = -e $STOPFILE;

    ## Just in case, stop it
    stop_bucardo();

    if ($had_stopfile) {
        print qq{Removing file "$STOPFILE"\n} unless $QUIET;
    }
    unlink $STOPFILE;

    $QUIET or print qq{Starting Bucardo\n};

    ## Disconnect from our local connection before we fork
    $dbh->disconnect();

    ## Remove nouns from @opts.
    ## XXX Will fail if an option value is the same as a noun.
    my %remove = map { $_ => undef } @nouns;
    @opts = grep { ! exists $remove{$_} } @opts;

    ## Fork and setsid to disassociate ourselves from the daemon
    if (fork) {
        ## We are the kid, do nothing
    }
    else {
        setsid() or die;
        ## Here we go!
        $bc->start_mcp( \@opts );
    }

    exit 0;

} ## end of start


sub stop {

    ## Attempt to stop the Bucardo daemon
    ## Arguments: none
    ## Returns: undef

    ## Write a note to the 'reason' log file
    append_reason_file('stop');

    print "Creating $STOPFILE ... " unless $QUIET;
    stop_bucardo();
    print "Done\n" unless $QUIET;

    ## If this was called directly, just exit now
    exit 0 if $verb eq 'stop';

    return;

} ## end of stop


sub stop_bucardo {

    ## Create the semaphore that tells all Bucardo processes to exit
    ## Arguments: none
    ## Returns: undef

    ## Create the file, and write some quick debug information into it
    ## The only thing the processe care about is if the file exists
    open my $stop, '>', $STOPFILE or die qq{Could not create "$STOPFILE": $!\n};
    print {$stop} "Stopped by $progname on " . (scalar localtime) . "\n";
    close $stop or warn qq{Could not close "$STOPFILE": $!\n};

    return;

} ## end of stop_bucardo


sub restart {

    ## Simple, really: stop, wait, start!
    ## Arguments: none
    ## Returns: undef

    stop();
    sleep 3;
    start();

    return;

} ## end of restart


sub reload {

    ## Reload the MCP daemon
    ## Effectively restarts everything
    ## Arguments: none
    ## Returns: never, exits

    ## Is Bucardo active?
    my $pong = 'bucardo_mcp_pong';
    $dbh->do("LISTEN $pong");
    $dbh->do('NOTIFY bucardo_mcp_ping');
    $dbh->commit();
    ## Wait a little bit, then scan for the confirmation message
    sleep 0.1;
    if (! wait_for_notice($dbh, $pong, 2)) {
        die "Looks like Bucardo is not running, so there is no need to reload\n";
    }

    ## We want to wait to hear from the MCP that it is done
    my $done = 'bucardo_reloaded_mcp';
    $dbh->do('NOTIFY bucardo_mcp_reload');
    $dbh->do("LISTEN $done");
    $dbh->commit();

    ## Wait a little bit, then scan for the confirmation message
    sleep 0.1;
    my $timeout = $adverb || get_config('reload_config_timeout') || 30;
    if (! wait_for_notice($dbh, $done, $timeout) ) {
        die "Waited ${timeout}s, but Bucardo never confirmed the reload!\n"
          . "HINT: Pass a longer timeout to the reload_config command or set the\n"
          . "reload_config_timeout configuration setting to wait longer\n";
    }
    print "DONE!\n";

    exit 0;

} ## end of reload


sub reload_config {

    ## Reload configuration settings from the bucardo database,
    ## then restart all controllers and kids
    ## Arguments: none directly (but processes the nouns to check for numeric arg)
    ## Returns: never, exits

    ## Scan the nouns for a numeric argument.
    ## If found, set as the adverb.
    ## This will cause us to wait for confirmation or reload before exiting
    for (@nouns) {
        if (/^(\d+)$/) {
            $adverb = $1;
            last;
        }
    }

    $QUIET or print qq{Forcing Bucardo to reload the bucardo_config table\n};

    ## Is Bucardo active?
    my $pong = 'bucardo_mcp_pong';
    $dbh->do("LISTEN $pong");
    $dbh->do('NOTIFY bucardo_mcp_ping');
    $dbh->commit();
    ## Wait a little bit, then scan for the confirmation message
    sleep 0.1;
    if (! wait_for_notice($dbh, $pong, 2)) {
        die "Looks like Bucardo is not running, so there is no need to reload\n";
    }

    ## We want to wait to hear from the MCP that it is done
    my $done = 'bucardo_reload_config_finished';
    $dbh->do('NOTIFY bucardo_reload_config');
    $dbh->do("LISTEN $done");
    $dbh->commit();

    ## Wait a little bit, then scan for the confirmation message
    sleep 0.1;
    my $timeout = $adverb || get_config('reload_config_timeout') || 30;
    if (! wait_for_notice($dbh, $done, $timeout) ) {
        die "Waited ${timeout}s, but Bucardo never confirmed the configuration reload!\n"
          . "HINT: Pass a longer timeout to the reload_config command or set the\n"
          . "reload_config_timeout configuration setting to wait longer\n";
    }
    print "DONE!\n";

    exit 0;

} ## end of reload_config


sub wait_for_notice {

    ## Keep hanging out until we get the notice we are waiting for
    ## Arguments: three
    ## 1. Database handle
    ## 2. String(s) to listen for
    ## 3. How long to wait (default is forever)
    ## Returns: 1
    ## If the strings argument is an array ref, this will return a hash ref
    ## where each key is a string we found, and the value is how many times we
    ## found it. Note that we return as soon as we've found at least one
    ## matching NOTIFY; we don't wait for the full timeout to see which
    ## messages show up.

    my ($ldbh, $string, $howlong) = @_;
    my ($num_strings, %search_strings, %matches);
    my $found = 0;
    if (ref $string eq 'ARRAY') {
        $num_strings = scalar @$string;
        map { $search_strings{$_} = 1 } @$string;
    }
    else {
        $num_strings = 1;
        $search_strings{$string} = 1;
    }

    my $start_time = [gettimeofday];

  WAITIN: {
        for my $notice (@{ db_get_notices($ldbh) }) {
            my ($name) = @$notice;
            if (exists $search_strings{$name}) {
                $found = 1;
                $matches{$name}++;
            }
        }
        last WAITIN if $found;

        if (defined $howlong) {
            my $elapsed = tv_interval( $start_time );
            return 0 if ($elapsed >= $howlong and (scalar keys %matches == 0));
        }

        $dbh->commit();
        sleep($WAITSLEEP);
        redo;
    }

    if (scalar keys %matches) {
        if ($num_strings == 1) {
            return 1;
        }
        else {
            return \%matches;
        }
    }
    else {
        if ($num_strings == 1) {
            return 0;
        }
        else {
            return {};
        }
    }
} ## end of wait_for_notice


sub reload_sync {

    ## Ask for one or more syncs to be reloaded
    ## Arguments: none directly (but processes the nouns for a list of syncs)
    ## Returns: never, exits

    my $doc_section = 'reload';
    usage_exit($doc_section) unless @nouns;

    for my $syncname (@nouns) {

        ## Be nice and allow things like $0 reload sync foobar
        next if $syncname eq 'sync';

        ## Make sure this sync exists, and grab its status
        $SQL = 'SELECT status FROM bucardo.sync WHERE name = ?';
        $sth = $dbh->prepare($SQL);
        $count = $sth->execute($syncname);
        if ($count != 1) {
            warn "Invalid sync: $syncname\n";
            $sth->finish();
            next;
        }
        my $status = $sth->fetch()->[0];

        ## Skip any syncs that are not active
        if ($status ne 'active') {
            warn qq{Cannot reload: status of sync "$syncname" is $status\n};
            next;
        }

        ## We wait for the MCP to tell us that each sync is done reloading
        my $done = "bucardo_reloaded_sync_$syncname";
        my $err  = "bucardo_reload_error_sync_$syncname";
        print "Reloading sync $syncname...";
        $dbh->do(qq{LISTEN "$done"});
        $dbh->do(qq{LISTEN "$err"});
        $dbh->do(qq{NOTIFY "bucardo_reload_sync_$syncname"});
        $dbh->commit();

        ## Sleep a little, then wait until we hear a confirmation from the MCP
        sleep 0.1;
        my $res = wait_for_notice($dbh, [$err, $done], 10);
        if ($res == 0 or scalar keys %$res == 0) {
            print "Reload of sync $syncname failed; reload response message never received\n";
        }
        elsif (exists $res->{$done}) {
            print "Reload of sync $syncname successful\n";
        }
        elsif (exists $res->{$err}) {
            print "Reload of sync $syncname failed\n";
        }
        else {
            print "ERROR. Reload results unavailable, because something weird happened.\n";
        }
        print "\n";

    } ## end each sync to be reloaded

    exit 0;

} ## end of reload_sync


sub reopen {

    ## Signal the bucardo processes that they should reopen any log files
    ## Used after a log rotation
    ## Sends a USR2 to all Bucardo processes
    ## Arguments: none
    ## Returns: never, exits

    open my $fh, '<', $PIDFILE
        or die qq{Could not open pid file $PIDFILE: is Bucardo running?\n};

    ## Grab the PID of the MCP
    if (<$fh> !~ /(\d+)/) { ## no critic
        die qq{Could not find a PID in file $PIDFILE!\n};
    }
    close $fh or warn qq{Could not close $PIDFILE: $!\n};

    my $gid = getpgrp $1;
    $gid =~ /^\d+$/ or die qq{Unable to obtain the process group\n};

    ## Quick mapping of names to numbers so we can kill effectively
    my $x = 0;
    my %signumber;
    for (split(' ', $Config{sig_name})) {
        $signumber{$_} = $x++;
    }

    my $signumber = $signumber{USR2};

    ## The minus indicates we are sending to the whole group
    my $num = kill -$signumber, $gid;
    if ($num < 1) {
        warn "Unable to signal any processed with USR2\n";
        exit 1;
    }
    $QUIET or print "Sent USR2 to Bucardo processes\n";

    exit 0;

} ## end of reopen


sub validate {

    ## Attempt to validate one or more syncs
    ## Arguments: none directly (but processes the nouns for a list of syncs)
    ## Returns: never, exits

    my $doc_section = 'validate';
    usage_exit($doc_section) unless @nouns;

    ## Build the list of syncs to validate
    my @synclist;

    ## Nothing specific is the same as 'all'
    if ($nouns[0] eq 'all' and ! defined $nouns[1]) {
        @synclist = sort keys %$SYNC;
        if (! @synclist) {
            print "Sorry, there are no syncs to validate!\n";
            exit 0;
        }
    }
    else {
        for my $name (@nouns) {

            ## Be nice and allow things like $0 validate sync foobar
            next if $name eq 'sync';

            if (! exists $SYNC->{$name}) {
                die qq{Sorry, there is no sync named "$name"\n};
            }
            push @synclist => $name;
        }
    }

    ## Get the largest sync name so we can line up the dots all pretty
    my $maxsize = 1;
    for my $name (@synclist) {
        $maxsize = length $name if length $name > $maxsize;
    }
    $maxsize += 3;

    ## Loop through and validate each in turn,
    ## waiting for a positive response from the MCP
    my $exitval = 0;
    for my $name (@synclist) {

        printf "Validating sync $name %s ",
            '.' x ($maxsize - length $name);

        my ($evalok, $success);
        eval {
            my ($message) = $dbh->selectrow_array(
                'SELECT validate_sync(?)',
                undef, $name
            );
            $dbh->commit;
            if ($message eq 'MODIFY') {
                $success = 1;
            }
            else {
                warn "$message\n";
                $exitval++;
            }
            $evalok = 1;
        };

        if ($evalok) {
            print "OK\n" if $success;
        }
        else {
            warn $dbh->errstr || $@;
            $exitval++;
        }

    }

    exit $exitval;

} ## end of validate


sub count_deltas {

    ## Count up rows in the delta tables
    ## Does not remove "unvacuumed" rows: assumes delta tables are getting emptied out by VAC
    ## Arguments: optional
    ## Returns: nothing, exits

    ## May want to see totals only
    my $total_only = (defined $nouns[0] and $nouns[0] =~ /totals?/i) ? 1 : 0;

    ## See if we want to limit it to specific databases
    my %dblimit;
    for my $name (@nouns) {

        ## Do not limit if doing a total, even if other names are specified
        next if $total_only;

        ## Allow wildcards
        if ($name =~ s/[%*]/.*/) {
            for (grep { $_ =~ /$name/ } keys %$DB) {
                $dblimit{$_}++;
            }
        }
        elsif (exists $DB->{$name}) {
            $dblimit{$name}++;
        }
    }

    ## No matches means we stop right away
    if (@nouns and !keys %dblimit and !$total_only) {
        warn qq{No matching databases were found: try "bucardo list dbs"\n};
        exit 1;
    }

    my $total = { grand => 0 };

    for my $dbname (sort keys %$DB) {
        my $db = $DB->{$dbname};

        ## Only sources should get checked
        if (! $db->{issource}) {
            if (delete $dblimit{$dbname}) {
                print "Skipping database $dbname: not a source\n";
            }
            elsif ($VERBOSE >= 1) {
                print "Skipping $dbname: not a source\n";
            }
            next;
        }

        ## If we are limiting, possibly skip this one
        next if keys %dblimit and ! exists $dblimit{$dbname};

        ## Make sure it has a bucardo schema.
        ## May not if validate_sync has never been run!
        my $dbh = connect_database($dbname);

        if (! schema_exists('bucardo')) {
            warn "Cannot check database $dbname: no bucardo schema!\n";
            next;
        }

        ## Grab all potential delta tables
        $SQL = 'SELECT deltaname FROM bucardo.bucardo_delta_names';
        for my $row (@{ $dbh->selectall_arrayref($SQL) }) {
            my $tname = $row->[0];
            $SQL = "SELECT count(*) FROM bucardo.$tname";
            $count = $dbh->selectall_arrayref($SQL)->[0][0];
            $total->{grand} += $count;
            $total->{database}{$dbname} += $count;
            if ($db->{status} ne 'active') {
                $total->{databaseinactive}{$dbname} = 1;
            }
        }
        $dbh->disconnect();
    }

    ## Stop here if we did not actually scan any databases because they are all non-source
    if (! keys %{ $total->{database} }) {
        print "No databases to check\n";
        exit 1;
    }

    ## Figure out our sizes for a pretty alignment
    my $grandmessage = 'Total deltas across all targets';
    my $dbmessage = 'Total deltas for database';
    my $size = { db => 0, largest => length $grandmessage, };
    for my $db (keys %{ $total->{database} }) {
        $size->{db} = length $db if length $db > $size->{db};
        my $len = length "  $dbmessage $db";
        $size->{largest} = $len if $len > $size->{largest};
    }

    printf "%*s: %s\n", $size->{largest}, $grandmessage, pretty_number($total->{grand});

    ## Break it down by database
    for my $db (sort keys %{ $total->{database} }) {
        next if $total_only;
        printf "%*s: %s%s\n",
            $size->{largest},
                "  $dbmessage $db",
                    pretty_number($total->{database}{$db}),
                        $total->{databaseinactive}{$db} ? ' (not active)' : '';
    }

    exit 0;

} ## end of count_deltas


sub purge {

    ## Purge the delta and track tables for one or more tables, for one or more databases
    ## Arguments: variable
    ## Returns: never, exits

    ## TODO: databases, tables, timeslices

    my $doc_section = 'purge';

    ## Nothing specific is the same as 'all'
    my $doall = 0;
    if (!@nouns or ($nouns[0] eq 'all' and ! defined $nouns[1])) {
        $doall = 1;
        for my $dbname (sort keys %$DB) {
            my $db = $DB->{$dbname};
            ## Do not purge inactive databases
            next if $db->{status} ne 'active';

            ## Do not purge unless they are a source
            next if ! $db->{issource};

            print "Checking db $dbname\n";

            ## Make sure it has a bucardo schema.
            ## May not if validate_sync has never been run!
            my $dbh = connect_database($dbname);

            if (! schema_exists('bucardo')) {
                warn "Cannot purge database $dbname: no bucardo schema!\n";
                next;
            }

            ## Run the purge_delta on this database
            $SQL = 'SELECT bucardo.bucardo_purge_delta(?)';
            $sth = $dbh->prepare($SQL);
            $sth->execute('1 second');
            my $results = $sth->fetchall_arrayref()->[0][0];
            ## Dump the resulting message back to the user
            ## Should be like this: Tables processed: 3
            print "$dbname: $results\n";

            $dbh->commit();

        }
    }
    if (! $doall) {
        for my $name (@nouns) {
            die "Purging name $name\n";
        }
    }

    exit 0;

} ## end of purge


sub add_item {

    ## Add an item to the internal bucardo database
    ## Arguments: none directly (but processes the nouns)
    ## Returns: never, exits

    my $doc_section = 'add/!.+';
    usage_exit($doc_section) unless @nouns;

    ## First word is the type of thing we are adding
    my $thing = shift @nouns;

    ## Account for variations and abbreviations
    $thing = standardize_name($thing);

    ## All of these will exit and do not return
    add_customcode() if $thing eq 'customcode';
    add_customname() if $thing eq 'customname';
    add_customcols() if $thing eq 'customcols';
    add_database()   if $thing eq 'database';
    add_dbgroup()    if $thing eq 'dbgroup';
    add_herd()       if $thing eq 'herd';
    add_sync()       if $thing eq 'sync';

    ## The rest is tables and sequences
    ## We need to support 'add table all' as well as 'add all tables'

    my $second_arg = $nouns[0] || '';

    ## Rearrange the args as needed, and determine if we want 'all'
    my $do_all = 0;

    if ($thing eq 'all') {
        $do_all = 1;
        $thing = shift @nouns;
        $thing = standardize_name($thing);
    }
    elsif (lc $second_arg eq 'all') {
        $do_all = 1;
        shift @nouns;
    }

    ## Quick check in case someone thinks they should add a goat
    if ($thing =~ /^goat/i) {
        warn qq{Cannot add a goat: use add table or add sequence instead\n};
        exit 1;
    }

    ## Add a table
    if ($thing eq 'table') {
        if ($do_all) {
            ## Add all the tables, and return the output
            print add_all_tables();
            ## The above does not commit, so make sure we do it here
            confirm_commit();
            exit 0;
        }
        else {
            add_table('table');
        }
    }

    ## Add a sequence
    if ($thing eq 'sequence') {
        if ($do_all) {
            ## Add all the sequences, and return the output
            print add_all_sequences();
            ## The above does not commit, so make sure we do it here
            $dbh->commit();
            exit 0;
        }
        else {
            add_table('sequence');
        }
    }

    ## Anything past this point is an error
    if ($do_all) {
        warn qq{The 'all' option can only be used with 'table' and 'sequence'\n};
        exit 1;
    }

    usage_exit($doc_section);

    return;

} ## end of add_item


sub update_item {

    ## Update some object in the database
    ## This merely passes control on to the more specific update_ functions
    ## Arguments: none (but parses nouns)
    ## Returns: undef

    my $doc_section = 'update/!.+';

    ## Must have at least three nouns
    usage_exit($doc_section) if @nouns < 3;

    ## What type of thing are we updating?
    my $thing = shift @nouns;

    ## Account for variations and abbreviations
    $thing = standardize_name($thing);

    my $code = $thing eq 'customcode' ? \&update_customcode
             : $thing eq 'database'   ? \&update_database
             : $thing eq 'dbgroup'    ? \&update_dbgroup
             : $thing eq 'sync'       ? \&update_sync
             : $thing eq 'table'      ? \&update_table
             : $thing eq 'sequence'   ? \&update_table
             :                          usage_exit($doc_section)
    ;

    ## The update function returns, due to recursion, so we must exit.
    $code->(@nouns);

    exit 0;

} ## end of update_item


sub list_item {

    ## Show information about one or more items in the bucardo database
    ## Arguments: none, but parses nouns
    ## Returns: 0 on success, -1 on error

    my $doc_section = 'list';
    usage_exit($doc_section) unless @nouns;

    ## First word is the type if thing we are listing
    my $thing = shift @nouns;

    ## Account for variations and abbreviations
    $thing = standardize_name($thing);

    SWITCH: {
        $thing eq 'clone' and do {
            list_clones();
            last SWITCH;
        };
        $thing eq 'config' and do {
            $verb = 'config';
            config();
            exit;
        };
        $thing eq 'customcode' and do {
            list_customcodes();
            last SWITCH;
        };
        $thing eq 'customname' and do {
            list_customnames();
            last SWITCH;
        };
        $thing eq 'customcols' and do {
            list_customcols();
            last SWITCH;
        };
        ## The dbgroup must be checked before the database (dbg vs db)
        $thing eq 'dbgroup' and do {
            list_dbgroups();
            last SWITCH;
        };
        $thing eq 'database' and do {
            list_databases();
            last SWITCH;
        };
        $thing eq 'herd' and do {
            list_herds();
            last SWITCH;
        };
        $thing eq 'sync' and do {
            list_syncs();
            last SWITCH;
        };
        $thing eq 'table' and do {
            list_tables();
            last SWITCH;
        };
        $thing eq 'sequence' and do {
            list_sequences();
            last SWITCH;
        };
        $thing eq 'all' and do {
            ## Not shown on purpose: clones
            if (keys %$CUSTOMCODE) {
                print "-- customcodes:\n"; list_customcodes();
            }
            if (keys %$CUSTOMNAME) {
                print "-- customnames:\n"; list_customnames();
            }
            if (keys %$CUSTOMCOLS) {
                print "-- customcols:\n"; list_customcols();
            }
            print "-- dbgroups:\n";     list_dbgroups();
            print "-- databases:\n";    list_databases();
            print "-- relgroup:\n";     list_herds();
            print "-- syncs:\n";        list_syncs();
            print "-- tables:\n";       list_tables();
            print "-- sequences:\n";    list_sequences();
            print "\n";
            last SWITCH;
        };

        ## catch all
        ## Cannot list anything else
        usage_exit($doc_section);

    } # SWITCH

    exit 0;

} ## end of list_item


sub remove_item {

    ## Delete from the bucardo database
    ## Arguments: none, but parses nouns
    ## Returns: never, exits

    my $doc_section = 'remove';
    usage_exit($doc_section) unless @nouns;

    ## First word is the type if thing we are removing
    my $thing = shift @nouns;
    ## Account for variations and abbreviations
    $thing = standardize_name($thing);
    my $second_arg = $nouns[0] || '';

    ## Allow the keyword 'all' to appear before or after the noun
    my $do_all = 0;
    if ($thing eq 'all') {
        $do_all = 1;
        $thing = shift @nouns;
        $thing = standardize_name($thing);
    }
    elsif (lc $second_arg eq 'all') {
        $do_all = 1;
        shift @nouns;
    }

    my $arg = $do_all ? 'all' : '';

    ## All of these will exit and do not return
    remove_customcode($arg) if $thing eq 'customcode';
    remove_customname($arg) if $thing eq 'customname';
    remove_customcols($arg) if $thing eq 'customcols';
    ## The dbgroup must be checked before the database (dbg vs db)
    remove_database($arg)   if $thing eq 'database';
    remove_dbgroup($arg)    if $thing eq 'dbgroup';
    remove_herd($arg)       if $thing eq 'herd';
    remove_sync($arg)       if $thing eq 'sync';

    remove_relation('table', $arg)    if $thing eq 'table';
    remove_relation('sequence', $arg) if $thing eq 'sequence';

    ## Do not know how to remove anything else
    usage_exit($doc_section);

    return;

} ## end of remove_item


##
## Database-related subroutines: add, remove, update, list
##

sub add_database {

    ## Add one or more databases. Inserts to the bucardo.db table
    ## By default, we do a test connection as well (turn off with the --force argument)
    ## Arguments: two or more
    ## 1. The internal name Bucardo uses to refer to this database
    ## 2+ name=value parameters, dash-dash arguments
    ## Returns: undef
    ## Example: bucardo add db nyc1 dbname=nyc1 dbhost=nyc1.example.com dbgroup=sales
    ## Example: bucardo add dbs nyc1,nyc2 dbname=nyc1,nyc2 dbgroup=sales

    ## Grab our generic usage message
    my $doc_section = 'add/add db';

    ## The first word is the internal name (bucardo.db.name) - may have commas
    my $item_name = shift @nouns || '';

    ## No name is a problem
    usage_exit($doc_section) unless length $item_name;

    ## We may have more than one database specified at once
    ## Assign to an array, and set the role as well in case a dbgroup is set
    my $db_names = [];
    my $newsource = 0;
    for my $entry (split /\s*,\s*/ => $item_name) {
        ## First database defaults to source, others to targets
        if (! @$db_names and $entry !~ /:/) {
            $entry .= ':source';
            $newsource = 1;
        }
        push @{ $db_names } => [ extract_name_and_role($entry) ];
    }

    ## Inputs and aliases, database column name, flags, default value
    my $validcols = q{
        db|dbname                dbname               0                null
        type|dbtype              dbtype               0                postgres
        pass|password|dbpass     dbpass               0                null
        host|dbhost|pghost       dbhost               0                ENV:PGHOSTADDR|PGHOST
        port|dbport|pgport       dbport               0                ENV:PGPORT
        conn|dbconn|pgconn       dbconn               0                null
        service|dbservice        dbservice            0                null
        stat|status              status               =active|inactive null
        group|dbgroup            dbgroup              0                null
        addalltables             none                 0                null
        addallsequences          none                 0                null
        server_side_prepares|ssp server_side_prepares TF               null
        makedelta                makedelta            TF               null
    };

    ## Include the value for the dbuser only if a service is not specified, or
    ## a user was explicitly included. In other words, don't default the user
    ## name when there's a service.
    $validcols .= "user|username|dbuser     dbuser               0                bucardo\n"
        if ((! grep { /^(db)?service=/ } @nouns) || grep { /^(db)?user(name)?=/ } @nouns);

    my ($dbcols) = process_simple_args({
        cols        => $validcols,
        list        => \@nouns,
        doc_section => $doc_section,
    });

    ## Must have a database name unless using a service
    if (! exists $dbcols->{dbname} && ! exists $dbcols->{dbservice}) {
        print qq{Cannot add database: must supply a database name to connect to\n};
        exit 1;
    }

    ## Cannot add if already there
    for my $db (map { $_->[0] } @$db_names) {
        if (exists $DB->{ $db }) {
            print qq{Cannot add database: the name "$db" already exists\n};
            exit 1;
        }
    }

    ## Clean up and standardize the type name
    my $dbtype = $dbcols->{dbtype} = standardize_rdbms_name($dbcols->{dbtype});

    ## If we have a service, strip the host and port as they may have been set via ENV
    if (exists $dbcols->{dbservice}) {
        delete $dbcols->{dbport};
        delete $dbcols->{dbhost};
    }

    ## We do not want some things to hang around in the dbcols hash
    my $dbgroup = delete $dbcols->{dbgroup};

    ## Map each value into individual databases
    my %dbinfo;
    for my $k (sort keys %$dbcols) {
        ## Each db in db_names needs to have an associated value for each dbcol entry
        ## Hence, we only use dbcols to build list of columns: values are kept in a hash
        next if $dbcols->{$k} !~ /,/;
        my @list = split /\s*,\s*/ => $dbcols->{$k};
        my $value;
        ## The dbnames can contain role information: strip it out from here
        if ('dbname' eq $k) {
            @list = map { [extract_name_and_role($_)]->[0] } @list;
        }
        for (my $x=0; defined $db_names->[$x]; $x++) {
            $value = $list[$x] if defined $list[$x];
            $dbinfo{$k}[$x] = $value;
        }
    }

    ## Attempt to insert into the bucardo.db table
    my $columns = join ',' => keys %$dbcols;
    my $qs = '?,' x keys %$dbcols;
    $SQL = "INSERT INTO bucardo.db (name,$columns) VALUES (${qs}?)";
    debug("SQL: $SQL");
    $sth = $dbh->prepare($SQL);
    for (my $x = 0; defined $db_names->[$x]; $x++) {
        my @args;
        for my $key (keys %$dbcols) {
            push @args => exists $dbinfo{$key} ? $dbinfo{$key}->[$x] : $dbcols->{$key};
        }
        my $evalok = 0;
        debug(Dumper $db_names->[$x]);
        debug(Dumper \@args);
        eval {
            $sth->execute($db_names->[$x][0], @args);
            $evalok = 1;
        };

        if (! $evalok) {

            if ($@ =~ /"db_name_sane"/) {
                die qq{Invalid name: you cannot refer to this database as "$db_names->[$x]"\n};
            }
            die "Failed to add database: $@\n";
        }
    }

    ## Store certain messages so we can output them in a desired order
    my $finalmsg = '';

    ## Test database handle
    my $testdbh;

    ## May want to do a test connection to each databases
  TESTCONN: {

        ## Nothing else to do for flatfiles
        last TESTCONN if 'flatfile' eq $dbtype;

        ## Get the module name, the way to refer to its database
        ## This also makes sure we have a valid type
        my %dbtypeinfo = (
            drizzle  => ['DBD::drizzle',  'Drizzle database'],
            mongo    => ['MongoDB',       'MongoDB'],
            mysql    => ['DBD::mysql',    'MySQL database'],
            mariadb  => ['DBD::mysql',    'MariaDB database'],
            oracle   => ['DBD::Oracle',   'Oracle database'],
            postgres => ['DBD::Pg',       'PostgreSQL database'],
            redis    => ['Redis',         'Redis database'],
            sqlite   => ['DBD::SQLite',   'SQLite database'],
        );
        if (! exists $dbtypeinfo{$dbtype}) {
            die qq{Unknown database type: $dbtype\n};
        }
        my ($module,$fullname) = @{ $dbtypeinfo{$dbtype} };

        ## Gather connection information from the database via db_getconn
        $SQL = 'SELECT bucardo.db_getconn(?)';
        $sth = $dbh->prepare($SQL);
        for my $db (map { $_->[0] } @$db_names) {
            $sth->execute($db);
            my $dbconn = $sth->fetchall_arrayref()->[0][0];

            ## Must be able to load the Perl driver
            my $evalok = 0;
            eval {
                eval "require $module";
                $evalok = 1;
            };
            if (! $evalok) {
                die "Cannot add unless the Perl module '$module' is available: $@\n";
            }

            ## Reset for the evals below
            $evalok = 0;

            ## Standard args for the DBI databases
            ## We put it here as we may move around with the Postgres bucardo user trick
            my ($type,$dsn,$user,$pass) = split /\n/ => $dbconn;

            ## Handle all of the ones that do not use standard DBI first

            if ('mongo' eq $dbtype) {

                my $mongodsn = {};
                for my $line (split /\n/ => $dbconn) {
                    next if $line !~ /(\w+):\s+(.+)/;
                    $mongodsn->{$1} = $2;
                }

                eval {
                    $testdbh = MongoDB::Connection->new($mongodsn); ## no critic
                    $evalok = 1;
                };
            }

            elsif ('redis' eq $dbtype) {

                my $tempdsn = {};
                for my $line (split /\n/ => $dbconn) {
                    next if $line !~ /(\w+):\s+(.+)/;
                    $tempdsn->{$1} = $2;
                }
                my $server;
                if (exists $tempdsn->{host}) {
                    $server = $tempdsn->{host};
                }
                if (exists $tempdsn->{port}) {
                    $server .= ":$tempdsn->{port}";
                }
                my @dsn;
                if (defined $server) {
                    push @dsn => 'server', $server;
                }

                $evalok = 0;
                eval {
                    $testdbh = Redis->new(@dsn);
                    $evalok = 1;
                };
            }

            ## Anything else must be something with a standard DBI driver
            else {
                eval {
                    $testdbh = DBI->connect($dsn, $user, $pass, {AutoCommit=>0,RaiseError=>1,PrintError=>0});
                    $evalok = 1;
                };
            }

            ## At this point, we have eval'd a connection
            if ($evalok) {
                ## Disconnect from DBI.
                $testdbh->disconnect if $module =~ /DBD/;
            }
            else {
                my $err = $DBI::errstr || $@;

                ## For Postgres, we get a little fancy and try to account for instances
                ## where the bucardo user may not exist yet, by reconnecting and
                ## creating said user if needed.
                if ($DBI::errstr
                    and 'postgres' eq $dbtype
                    and $user eq 'bucardo'
                    and $DBI::errstr =~ /bucardo/
                    and eval { require Digest::MD5; 1 }) {

                    # Try connecting as postgres instead.
                    print qq{Connection to "$db" ($fullname) as user bucardo failed.\nError was: $DBI::errstr\n\n};
                    print qq{Will try to connect as user postgres and create superuser $user...\n\n};
                    my $dbh = eval {
                        DBI->connect($dsn, 'postgres', $pass, {AutoCommit=>1,RaiseError=>1,PrintError=>0});
                    };
                    if ($dbh) {
                        ## Create the bucardo user now. We'll need a password;
                        ## create one if we don't have one.
                        my $connok = 0;
                        eval {
                            my $newpass = $pass || generate_password();
                            my $encpass = Digest::MD5::md5_hex($newpass);
                            $dbh->do(qq{CREATE USER $user SUPERUSER ENCRYPTED PASSWORD '$encpass'});
                            $dbh->disconnect;
                            my $extrauser = $pass ? '' : qq{ with password "$newpass"};
                            warn "Created superuser '$user'$extrauser\n\n";
                            $pass = $newpass;
                            $connok = 1;
                        };
                        goto TESTCONN if $connok;
                        $err = $DBI::errstr || $@;
                        $msg = "Unable to create superuser $user";
                    }
                    else {
                        $err = $DBI::errstr || $@;
                        $msg = 'Connection as postgres failed, too';
                    }
                }
                else {
                    $msg = qq{Connection to "$db" ($fullname) failed};
                }

                die "$msg. You may force add it with the --force argument.\nError was: $err\n\n"
                    unless $bcargs->{force};
                warn "$msg, but will add anyway.\nError was: $err\n";
            }
        } ## End each database to connect to

    } ## end of TESTCONN

    ## If we got a group, process that as well
    if (defined $dbgroup) {

        ## If the dbnames had supplied role information, extract that now
        if (exists $dbcols->{dbname} and $dbcols->{dbname} =~ /:/) {
            my $x=0;
            for my $namerole (split /\s*,\s*/ => $dbcols->{dbname}) {
                my ($name,$role) = extract_name_and_role($namerole);
                debug("$namerole gave us $name and $role");
                $db_names->[$x++][1] = $role;
            }
        }

        ## If it has an attached role, strip it out and force that everywhere
        my $master_role = $dbgroup =~ s/:(\w+)// ? $1 : 0;

        ## We need to store this away as the function below changes the global hash
        my $isnew = exists $DBGROUP->{$dbgroup} ? 0 : 1;
        my $firstrow = 1;
        for my $row (@$db_names) {

            my ($db,$role) = @$row;

            ## If we set this source ourself, change to target if the group already exists
            if ($firstrow) {
                $firstrow = 0;
                if ($newsource and ! $isnew) {
                    $role = 'target';
                }
            }

            ## The master role trumps everything
            $role = $master_role if $master_role;

            my ($newgroup, $newrole) = add_db_to_group($db, "$dbgroup:$role");
            if ($isnew) {
                $finalmsg .= qq{Created dbgroup "$newgroup"\n};
                $isnew = 0;
            }
            $finalmsg .= qq{  Added database "$db" to dbgroup "$newgroup" as $newrole\n};
        }
    }

    ## Adjust the db name so add_all_* can use it
    $bcargs->{db} = $db_names->[0][0];

    ## Make sure $DB gets repopulated for the add_all_* calls below
    load_bucardo_info(1);

    ## Add in all tables for this database
    $finalmsg .= add_all_tables() if grep /addalltab/i, @nouns;

    ## Add in all sequences for this database
    $finalmsg .= add_all_sequences() if grep /addallseq/i, @nouns;

    if (!$QUIET) {
        my $list = join ',' => map { qq{"$_->[0]"} } @$db_names;
        printf qq{Added %s %s\n},
            $list =~ /,/ ? 'databases' : 'database', $list;
        $finalmsg and print $finalmsg;
    }

    confirm_commit();

    exit 0;

} ## end of add_database


sub remove_database {

    ## Remove one or more databases. Updates the bucardo.db table
    ## Use the --force argument to clear out related tables and groups
    ## Arguments: one or more
    ## 1+ Name of a database
    ## Returns: undef
    ## Example: bucardo remove db nyc1 nyc2 --force

    my $doc_section = 'remove';
    usage_exit($doc_section) unless @nouns;

    ## Make sure all named databases exist
    for my $name (@nouns) {
        if (! exists $DB->{$name}) {
            die qq{No such database "$name"\n};
        }
    }

    ## Prepare the SQL to delete each database
    $SQL = 'DELETE FROM bucardo.db WHERE name = ?';
    $sth = $dbh->prepare($SQL);

    ## Loop through and attempt to delete each given database
    for my $name (@nouns) {
        ## Wrap in an eval so we can handle known exceptions
        my $evalok = 0;
        $dbh->pg_savepoint('try_remove_db');
        eval {
            $sth->execute($name);
            $evalok = 1;
        };
        if (! $evalok) {
            if ($bcargs->{force} and $@ =~ /"goat_db_fk"|"dbmap_db_fk"/) {
                $QUIET or warn qq{Dropping all tables and dbgroups that reference database "$name"\n};
                $dbh->pg_rollback_to('try_remove_db');
                $dbh->do('DELETE FROM bucardo.goat WHERE db = ' . $dbh->quote($name));
                $dbh->do('DELETE FROM bucardo.dbmap WHERE db = ' . $dbh->quote($name));
                ## Try the same query again
                eval {
                    $sth->execute($name);
                };
            }

            ## We've failed: output a reasonable message when possible
            if ($@ =~ /"goat_db_fk"/) {
                die qq{Cannot delete database "$name": must remove all tables that reference it first (try --force)\n};
            }
            if ($@ =~ /"dbmap_db_fk"/) {
                die qq{Cannot delete database "$name": must remove all dbmap references first (try --force)\n};
            }
            $@ and die qq{Could not delete database "$name"\n$@\n};
        }
    }

    for my $name (@nouns) {
        $QUIET or print qq{Removed database "$name"\n};
    }

    confirm_commit();

    exit 0;

} ## end of remove_database


sub update_database {

    ## Update one or more databases.
    ## This may modify the bucardo.db, bucardo.dbgroup, and bucardo.dbmap tables
    ## Arguments: two plus
    ## 1. Name of the database to update. Can be "all" and can have wildcards
    ## 2+ What exactly we are updating.
    ## Returns: undef
    ## Example: bucardo update db nyc1 port=6543 group=nycservers:source,globals

    my @actions = @_;

    ## Grab our generic usage message
    my $doc_section = 'update/update db';
    usage_exit($doc_section) unless @actions;

    my $name = shift @actions;

    ## Recursively call ourselves for wildcards and 'all'
    return if ! check_recurse($DB, $name, @actions);

    ## Make sure this database exists!
    if (! exists $DB->{$name}) {
        die qq{Could not find a database named "$name"\nUse 'list dbs' to see all available.\n};
    }

    ## Everything is a name=value setting after this point
    ## We will ignore and allow noise word "set"
    for my $arg (@actions) {
        next if $arg =~ /set/i;
        next if $arg =~ /\w+=\w+/o;
        usage_exit($doc_section);
    }

    ## Change the arguments into a hash
    my $args = process_args(join ' ' => @actions);

    ## Track what changes we made
    my %change;

    ## Walk through and handle each argument pair
    for my $setting (sort keys %$args) {

        next if $setting eq 'extraargs';

        ## Change the name to a more standard form, to better figure out what they really mean
        ## This also excludes all non-alpha characters
        my $newname = transform_name($setting);

        ## Exclude ones that cannot / should not be changed (e.g. cdate)
        if (exists $column_no_change{$newname}) {
            print "Sorry, the value of $setting cannot be changed\n";
            exit 1;
        }

        ## Standardize the values as well
        my $value = $args->{$setting};
        my $newvalue = transform_value($value);
        my $oldvalue = $DB->{$name}{$newname};

        ## We want certain booleans to appear as "off/on"
        if ($setting =~ /makedelta|server_side_prepares/) {
            $oldvalue = $oldvalue ? 'on' : 'off';
            ## Clean up, but lightly so invalid entries fall through for later
            if ($newvalue =~ /^[1tT]/ or $newvalue =~ /^on/i) {
                $newvalue = 'on';
            }
            elsif ($newvalue =~ /^[0fF]/ or $newvalue =~ /^off/i) {
                $newvalue = 'off';
            }
        }

        ## Handle all the non-standard columns
        if ($newname =~ /^group/) {

            ## Track the changes and publish at the end
            my @groupchanges;

            ## Grab the current hash of groups
            my $oldgroup = $DB->{$name}{group} || '';

            ## Keep track of what groups they end up in, so we can remove as needed
            my %donegroup;

            ## Break apart into individual groups
            for my $fullgroup (split /\s*,\s*/ => $newvalue) {

                my ($group,$role,$extra) = extract_name_and_role($fullgroup);

                ## Note that we've found this group
                $donegroup{$group}++;

                ## Does this group exist?
                if (! exists $DBGROUP->{$group}) {
                    create_dbgroup($group);
                    push @groupchanges => qq{Created dbgroup "$group"};
                }

                ## Are we a part of it already?
                if ($oldgroup and exists $oldgroup->{$group}) {

                    ## Same role?
                    my $oldrole = $oldgroup->{$group}{role};
                    if ($oldrole eq $role) {
                        $QUIET or print qq{No change: database "$name" already belongs to dbgroup "$group" as $role\n};
                    }
                    else {
                        change_db_role($role,$group,$name);
                        push @groupchanges => qq{Changed role for database "$name" in dbgroup "$group" from $oldrole to $role};
                    }
                }
                else {
                    ## We are not a part of this group yet
                    add_db_to_group($name, "$group:$role");
                    push @groupchanges => qq{Added database "$name" to dbgroup "$group" as $role};
                }

                ## Handle any extra modifiers
                if (keys %$extra) {
                    update_dbmap($name, $group, $extra);
                    my $list = join ',' => map { "$_=$extra->{$_}" } sort keys %$extra;
                    push @groupchanges => qq{For database "$name" in dbgroup "$group", set $list};
                }

            } ## end each group specified

            ## See if we are removing any groups
            if ($oldgroup) {
                for my $old (sort keys %$oldgroup) {
                    next if exists $donegroup{$old};

                    ## Remove this database from the group, but do not remove the group itself
                    remove_db_from_group($name, $old);
                    push @groupchanges => qq{Removed database "$name" from dbgroup "$old"};
                }
            }

            if (@groupchanges) {
                for (@groupchanges) {
                    chomp;
                    $QUIET or print "$_\n";
                }
                confirm_commit();
            }

            ## Go to the next setting
            next;

        } ## end of 'group' adjustments

        ## This must exist in our hash
        if (! exists $DB->{$name}{$newname}) {
            print qq{Cannot change "$newname"\n};
            next;
        }

        ## Has this really changed?
        if ($oldvalue eq $newvalue) {
            print "No change needed for $newname\n";
            next;
        }

        ## Add to the queue. Overwrites previous ones
        $change{$newname} = [$oldvalue, $newvalue];

    } ## end each setting

    ## If we have any changes, attempt to make them all at once
    if (%change) {
        my $SQL = 'UPDATE bucardo.db SET ';
        $SQL .= join ',' => map { "$_=?" } sort keys %change;
        $SQL .= ' WHERE name = ?';
        my $sth = $dbh->prepare($SQL);
        eval {
            $sth->execute((map { $change{$_}[1] } sort keys %change), $name);
        };
        if ($@) {
            $dbh->rollback();
            $dbh->disconnect();
            print "Sorry, failed to update the bucardo.db table. Error was:\n$@\n";
            exit 1;
        }

        for my $item (sort keys %change) {
            my ($old,$new) = @{ $change{$item} };
            print "Changed bucardo.db $item from $old to $new\n";
        }

        confirm_commit();
    }

    return;

} ## end of update_database


sub list_databases {

    ## Show information about databases. Queries the bucardo.db table
    ## Arguments: zero or more
    ## 1+ Databases to view. Can be "all" and can have wildcards
    ## Returns: 0 on success, -1 on error
    ## Example: bucardo list db sale%

    ## Might be no databases yet
    if (! keys %$DB) {
        print "No databases have been added yet\n";
        return -1;
    }

    ## If not doing all, keep track of which to show
    my %matchdb;

    for my $term (@nouns) {

        ## Special case for all: same as no nouns at all, so simply remove them!
        if ($term =~ /\ball\b/i) {
            undef %matchdb;
            undef @nouns;
            last;
        }

        ## Check for wildcards
        if ($term =~ s/[*%]/.*/) {
            for my $name (keys %$DB) {
                $matchdb{$name} = 1 if $name =~ /^$term$/;
            }
            next;
        }

        ## Must be an exact match
        for my $name (keys %$DB) {
            $matchdb{$name} = 1 if $name eq $term;
        }

    } ## end each term

    ## No matches?
    if (@nouns and ! keys %matchdb) {
        print "No matching databases found\n";
        return -1;
    }

    ## We only show the type if they are different from each other
    my %typecount;

    ## Figure out the length of each item for a pretty display
    my ($maxdb,$maxtype,$maxstat,$maxlim1,$maxlim2,$showlim) = (1,1,1,1,1,0);
    for my $name (sort keys %$DB) {
        next if @nouns and ! exists $matchdb{$name};
        my $info = $DB->{$name};
        $typecount{$info->{dbtype}}++;
        $maxdb   = length $info->{name} if length $info->{name} > $maxdb;
        $maxtype = length $info->{dbtype} if length $info->{dbtype} > $maxtype;
        $maxstat = length $info->{status} if length $info->{status} > $maxstat;
    }

    ## Do we show types?
    my $showtypes = keys %typecount > 1 ? 1 : 0;

    ## Now do the actual printing
    for my $name (sort keys %$DB) {
        next if @nouns and ! exists $matchdb{$name};
        my $info = $DB->{$name};
        my $type = sprintf 'Type: %-*s  ',
            $maxtype, $info->{dbtype};
        printf 'Database: %-*s  %sStatus: %-*s  ',
            $maxdb, $info->{name},
            $showtypes ? $type : '',
            $maxstat, $info->{status};
        my $showhost = length $info->{dbhost} ? " -h $info->{dbhost}" : '';
        my $showport = $info->{dbport} =~ /\d/ ? " -p $info->{dbport}" : '';
        my $dbtype = $info->{dbtype};
        if ($dbtype eq 'postgres') {
            print "Conn: psql$showport -U $info->{dbuser} -d $info->{dbname}$showhost";
            if (! $info->{server_side_prepares}) {
                print ' (SSP is off)';
            }
            if ($info->{makedelta}) {
                print ' (makedelta on)';
            }
        }
        if ($dbtype eq 'drizzle') {
            $showport = (length $info->{dbport} and $info->{dbport} != 3306)
                ? " --port $info->{dbport}" : '';
            printf 'Conn: drizzle -u %s -D %s%s%s',
                $info->{dbuser},
                $info->{dbname},
                $showhost,
                $showport;
        }
        if ($dbtype eq 'flatfile') {
            print "Prefix: $info->{dbname}";
        }
        if ($dbtype eq 'mongo') {
            if (length $info->{dbhost}) {
                print "Host: $info->{dbhost}";
            }
        }
        if ($dbtype eq 'mysql' or $dbtype eq 'mariadb') {
            $showport = (length $info->{dbport} and $info->{dbport} != 3306)
                ? " --port $info->{dbport}" : '';
            printf 'Conn: mysql -u %s -D %s%s%s',
                $info->{dbuser},
                $info->{dbname},
                $showhost,
                $showport;
        }
        if ($dbtype eq 'oracle') {
            printf 'Conn: sqlplus %s%s',
                $info->{dbuser},
                $showhost ? qq{\@$showhost} : '';
        }
        if ($dbtype eq 'redis') {
            my $server = '';
            if (length $info->{dbhost}) {
                $server .= $info->{dbhost};
            }
            if (length $info->{dbport}) {
                $server .= ":$info->{dbport}";
            }
            if ($server) {
                $server = "server=$server";
                print "Conn: $server";
            }
        }
        if ($dbtype eq 'sqlite') {
            printf 'Conn: sqlite3 %s',
                $info->{dbname};
        }

        print "\n";

        if ($VERBOSE) {

            ## Which dbgroups is this a member of?
            if (exists $info->{group}) {
                for my $group (sort keys %{ $info->{group} }) {
                    my $i = $info->{group}{$group};
                    my $role = $i->{role};
                    my $gang = $i->{gang};
                    my $pri = $i->{priority};
                    print "  Belongs to dbgroup $group ($role)";
                    $pri and print "  Priority:$pri";
                    print "\n";
                }
            }

            ## Which syncs are using it, and as what role
            if (exists $info->{sync}) {
                for my $syncname (sort keys %{ $info->{sync} }) {
                    print "  Used in sync $syncname in a role of $info->{sync}{$syncname}{role}\n";
                }
            }

            $VERBOSE >= 2 and show_all_columns($info);
        }
    }

    return 0;

} ## end of list_databases


##
## Database-group-related subroutines: add, remove, update, list
##

sub add_dbgroup {

    ## Add one or more dbgroups. Inserts to the bucardo.dbgroup table
    ## May also insert to the bucardo.dbmap table
    ## Arguments: one plus
    ## 1. The name of the group we are creating
    ## 2+ Databases to add to this group, with optional role information attached
    ## Returns: undef
    ## Example: bucardo add dbgroup nycservers nyc1:source nyc2:source lax1

    ## Grab our generic usage message
    my $doc_section = 'add/add dbgroup';

    my $name = shift @nouns || '';

    ## Must have a name
    usage_exit($doc_section) unless length $name;

    ## Create the group if it does not exist
    if (! exists $DBGROUP->{$name}) {
        create_dbgroup($name);
        $QUIET or print qq{Created dbgroup "$name"\n};
    }

    ## Add all these databases to the group
    for my $dblist (@nouns) {

        for my $fulldb (split /\s*,\s*/ => $dblist) {

            ## Figure out the optional role
            my ($db,$role) = extract_name_and_role($fulldb);

            ## This database must exist!
            if (! exists $DB->{$db}) {
                print qq{The database "$db" does not exist\n};
                exit 1;
            }

            add_db_to_group($db, "$name:$role");

            $QUIET or print qq{Added database "$db" to dbgroup "$name" as $role\n};
        }
    }

    confirm_commit();

    exit 0;

} ## end of add_dbgroup


sub remove_dbgroup {

    ## Remove one or more entries from the bucardo.dbgroup table
    ## Arguments: one or more
    ## 1+ Name of a dbgroup
    ## Returns: undef
    ## Example: bucardo remove dbgroup sales

    my $doc_section = 'remove';

    ## Must have at least one name
    usage_exit($doc_section) unless @nouns;

    ## Make sure all the groups exist
    for my $name (@nouns) {
        if (! exists $DBGROUP->{$name}) {
            die qq{No such dbgroup: $name\n};
        }
    }

    ## Prepare the SQL to delete each group
    $SQL = q{DELETE FROM bucardo.dbgroup WHERE name = ?};
    $sth = $dbh->prepare($SQL);

    for my $name (@nouns) {
        ## Wrap in an eval so we can handle known exceptions
        eval {
            $sth->execute($name);
        };
        if ($@) {
            if ($@ =~ /"sync_dbs_fk"/) {
                if ($bcargs->{force}) {
                    $QUIET or warn qq{Dropping all syncs that reference the dbgroup "$name"\n};
                    $dbh->rollback();
                    $dbh->do('DELETE FROM bucardo.sync WHERE dbs = ' . $dbh->quote($name));
                    eval {
                        $sth->execute($name);
                    };
                    goto NEND if ! $@;
                }
                else {
                    die qq{Cannot remove dbgroup "$name": it is being used by one or more syncs\n};
                }
            }
            die qq{Could not delete dbgroup "$name"\n$@\n};
        }
          NEND:
        $QUIET or print qq{Removed dbgroup "$name"\n};
    }

    confirm_commit();

    exit 0;

} ## end of remove_dbgroup


sub update_dbgroup {

    ## Update one or more dbgroups
    ## This may modify the bucardo.dbgroup and bucardo.dbmap tables
    ## Arguments: two or more
    ## 1. Group to be updated
    ## 2. Databases to be adjusted, or name change request (name=newname)
    ## Returns: undef
    ## Example: bucardo update dbgroup sales A:target

    my @actions = @_;

    my $doc_section = 'update/update dbgroup';
    usage_exit($doc_section) unless @actions;

    my $name = shift @actions;

    ## Recursively call ourselves for wildcards and 'all'
    exit 0 if ! check_recurse($DBGROUP, $name, @actions);

    ## Make sure this dbgroup exists!
    if (! exists $DBGROUP->{$name}) {
        die qq{Could not find a dbgroup named "$name"\nUse 'list dbgroups' to see all available.\n};
    }

    ## From this point on, we have either:
    ## 1. A rename request
    ## 2. A database to add/modify

    ## Track dbs and roles
    my %dblist;

    ## Track if we call confirm_commit or not
    my $changes = 0;

    for my $action (@actions) {
        ## New name for this group?
        if ($action =~ /name=(.+)/) {
            my $newname = $1;
            if ($newname !~ /^$re_dbgroupname$/) {
                die qq{Invalid dbgroup name "$newname"\n};
            }
            next if $name eq $newname; ## Duh
            $SQL = 'UPDATE bucardo.dbgroup SET name=? WHERE name=?';
            $sth = $dbh->prepare($SQL);
            $sth->execute($newname, $name);
            $QUIET or print qq{Changed dbgroup name from "$name" to "$newname"\n};
            $changes++;
            next;
        }

        ## Assume the rest is databases to modify

        ## Default role is always target
        my ($db,$role) = extract_name_and_role($action);
        $dblist{$db} = $role;
    }

    ## Leave now if no databases to handle
    if (! %dblist) {
        $changes and confirm_commit();
        exit 0;
    }

    ## The old list of databases:
    my $oldlist = $DBGROUP->{$name}{db} || {};

    ## Walk through the old and see if any were changed or removed
    for my $db (sort keys %$oldlist) {
        if (! exists $dblist{$db}) {
            remove_db_from_group($db, $name);
            $QUIET or print qq{Removed database "$db" from dbgroup "$name"\n};
            $changes++;
            next;
        }
        my $oldrole = $oldlist->{$db}{role};
        my $newrole = $dblist{$db};
        if ($oldrole ne $newrole) {
            change_db_role($newrole, $name, $db);
            $QUIET or print qq{Changed role of database "$db" in dbgroup "$name" from $oldrole to $newrole\n};
            $changes++;
        }
    }

    ## Walk through the new and see if any are truly new
    for my $db (sort keys %dblist) {
        next if exists $oldlist->{$db};
        my $role = $dblist{$db};
        add_db_to_group($db, "$name:$role");
        $QUIET or print qq{Added database "$db" to dbgroup "$name" as $role\n};
        $changes++;
    }

    confirm_commit() if $changes;

    return;

} ## end of update_dbgroup


sub list_dbgroups {

    ## Show information about all or some subset of the bucardo.dbgroup table
    ## Arguments: zero or more
    ## 1+ Groups to view. Can be "all" and can have wildcards
    ## Returns: 0 on success, -1 on error
    ## Example: bucardo list dbgroups

    ## Might be no groups yet
    if (! keys %$DBGROUP) {
        print "No dbgroups have been added yet\n";
        return -1;
    }

    ## If not doing all, keep track of which to show
    my %matchdbg;

    for my $term (@nouns) {

        ## Special case for all: same as no nouns at all, so simply remove them!
        if ($term =~ /\ball\b/i) {
            undef %matchdbg;
            undef @nouns;
            last;
        }

        ## Check for wildcards
        if ($term =~ s/[*%]/.*/) {
            for my $name (keys %$DBGROUP) {
                $matchdbg{$name} = 1 if $name =~ /$term/;
            }
            next;
        }

        ## Must be an exact match
        for my $name (keys %$DBGROUP) {
            $matchdbg{$name} = 1 if $name eq $term;
        }

    } ## end each term

    ## No matches?
    if (@nouns and ! keys %matchdbg) {
        print "No matching dbgroups found\n";
        return -1;
    }

    ## Figure out the length of each item for a pretty display
    my ($maxlen) = (1);
    for my $name (sort keys %$DBGROUP) {
        next if @nouns and ! exists $matchdbg{$name};
        my $info = $DBGROUP->{$name};
        $maxlen = length $info->{name} if length $info->{name} > $maxlen;
    }

    ## Print it
    for my $name (sort keys %$DBGROUP) {
        next if @nouns and ! exists $matchdbg{$name};
        my $info = $DBGROUP->{$name};
        ## Does it have associated databases?
        my $dbs = '';
        if (exists $DBGROUP->{$name}{db}) {
            $dbs = '  Members:';
            for my $dbname (sort keys %{ $DBGROUP->{$name}{db} }) {
                my $i = $DBGROUP->{$name}{db}{$dbname};
                $dbs .= " $dbname:$i->{role}";
                ## Only show the gang if this group is using multiple gangs
                if ($DBGROUP->{$name}{gangs} >= 2) {
                    $dbs .= ":gang=$i->{gang}";
                }
                ## Only show the priority if <> 0
                if ($i->{priority} != 0) {
                    $dbs .= ":pri=$i->{priority}";
                }
            }
        }
        printf "dbgroup: %-*s%s\n",
            $maxlen, $name, $dbs;
        $VERBOSE >= 2 and show_all_columns($info);
    }

    return 0;

} ## end of list_dbgroups


##
## Customname-related subroutines: add, exists, remove, list
##

sub add_customname {

    ## Add an item to the customname table
    ## Arguments: none, parses nouns for tablename|goatid, syncname, database name
    ## Returns: never, exits
    ## Examples:
    ## bucardo add customname public.foobar foobarz
    ## bucardo add customname public.foobar foobarz sync=bee
    ## bucardo add customname public.foobar foobarz db=baz
    ## bucardo add customname public.foobar foobarz db=baz sync=bee

    my $item_name = shift @nouns || '';

    my $doc_section = 'add/add customname';

    my $newname = shift @nouns || '';

    usage_exit($doc_section) unless length $item_name && length $newname;

    ## Does this number or name exist?
    my $goat;
    if (exists $GOAT->{by_fullname}{$item_name}) {
        $goat = $GOAT->{by_fullname}{$item_name};
    }
    elsif (exists $GOAT->{by_table}{$item_name}) {
        $goat = $GOAT->{by_table}{$item_name};
    }
    elsif (exists $GOAT->{by_id}{$item_name}) {
        $goat = $GOAT->{by_id}{$item_name};
    }
    else {
        print qq{Could not find a matching table for "$item_name"\n};
        exit 1;
    }

    ## If this is a ref due to it being an unqualified name, just use the first one
    $goat = $goat->[0] if ref $goat eq 'ARRAY';
    my ($sname,$tname) = ($goat->{schemaname},$goat->{tablename});

    ## The new name can have a schema. If it does not, use the "old" one
    my $Sname;
    my $Tname = $newname;
    if ($Tname =~ /(.+)\.(.+)/) {
        ($Sname,$Tname) = ($1,$2);
    }
    else {
        $Sname = $sname;
    }

    ## If the new name contains an equal sign, treat as an error
    usage_exit($doc_section) if $Tname =~ /=/;

    ## Names cannot be the same
    if ($sname eq $Sname and $tname eq $Tname) {
        print qq{The new name cannot be the same as the old\n};
        exit 1;
    }

    ## Parse the rest of the arguments
    my (@sync,@db);
    for my $arg (@nouns) {
        ## Name of a sync
        if ($arg =~ /^sync\s*=\s*(.+)/) {
            my $sync = $1;
            if (! exists $SYNC->{$sync}) {
                print qq{No such sync: "$sync"\n};
                exit 1;
            }
            push @sync => $sync;
        }
        elsif ($arg =~ /^(?:db|database)\s*=\s*(.+)/) {
            my $db = $1;
            if (! exists $DB->{$db}) {
                print qq{No such database: "$db"\n};
                exit 1;
            }
            push @db => $db;
        }
        else {
            usage_exit($doc_section);
        }
    }

    ## Loop through and start adding rows to customname
    my $goatid = $goat->{id};

    $SQL = "INSERT INTO bucardo.customname(goat,newname,db,sync) VALUES ($goatid,?,?,?)";
    $sth = $dbh->prepare($SQL);

    ## We may have multiple syncs or databases, so loop through
    my $x = 0;
    my @msg;
    {

        ## Setup common message post scripts
        my $message = '';
        defined $db[$x] and $message .= " (for database $db[$x])";
        defined $sync[$x] and $message .= " (for sync $sync[$x])";

        ## Skip if this exact entry already exists
        if (customname_exists($goatid,$newname,$db[$x],$sync[$x])) {
            if (!$QUIET) {
                printf "Already have an entry for %s to %s%s\n",
                    $item_name, $newname, $message;
            }
            next;
        }

        $sth->execute($newname, $db[$x], $sync[$x]);
        push @msg => "Transformed $sname.$tname to $newname$message";

        ## Always go at least one round
        ## We go a second time if there is another sync or db waiting
        $x++;
        redo if defined $db[$x] or defined $sync[$x];
        last;
    }

    if (!$QUIET) {
        for (@msg) {
            chomp; ## Just in case we forgot above
            print "$_\n";
        }
    }

    confirm_commit();

    exit 0;

} ## end of add_customname


sub remove_customname {

    ## Remove one or more entries from the bucardo.customname table
    ## Arguments: one or more
    ## 1+ IDs to be deleted
    ## Returns: undef
    ## Example: bucardo remove customname 7

    ## Grab our generic usage message
    my $doc_section = 'remove';
    usage_exit($doc_section) unless @nouns;

    ## Make sure each argument is a number
    for my $name (@nouns) {
        usage_exit($doc_section) if $name !~ /^\d+$/;
    }

    ## We want the per-id hash here
    my $cn = $CUSTOMNAME->{id};

    ## Give a warning if a number does not exist
    for my $name (@nouns) {
        if (! exists $cn->{$name}) {
            $QUIET or warn qq{Customname number $name does not exist\n};
        }
    }

    ## Prepare the SQL to delete each customname
    $SQL = 'DELETE FROM bucardo.customname WHERE id = ?';
    $sth = $dbh->prepare($SQL);

    ## Go through and delete any that exist
    for my $number (@nouns) {

        ## We've already handled these in the loop above
        next if ! exists $cn->{$number};

        ## Unlike other items, we do not need an eval,
        ## because it has no cascading dependencies
        $sth->execute($number);

        my $cc = sprintf '%s => %s%s%s',
            $cn->{$number}{tname},
            $cn->{$number}{newname},
            (length $cn->{$number}{sync} ? " Sync: $cn->{$number}{sync}" : ''),
            (length $cn->{$number}{db} ? " Database: $cn->{$number}{db}" : '');

        $QUIET or print qq{Removed customcode $number: $cc\n};

    }

    confirm_commit();

    exit 0;

} ## end of remove_customname


sub customname_exists {

    ## See if an entry already exists in the bucardo.customname table
    ## Arguments: four
    ## 1. Goat id
    ## 2. New name
    ## 3. Database name (can be null)
    ## 4. Sync name (can be null)
    ## Returns: true or false (1 or 0)

    my ($id,$newname,$db,$sync) = @_;

    ## Easy if there are no entries yet!
    return 0 if ! keys %$CUSTOMNAME;

    my $cn = $CUSTOMNAME->{goat};

    ## Quick filtering by the goatid
    return 0 if ! exists $cn->{$id};

    my $matchdb = defined $db ? $db : '';
    my $matchsync = defined $sync ? $sync : '';

    return exists $cn->{$id}{$matchdb}{$matchsync};

} ## end of customname_exists


sub list_customnames {

    ## Show information about all or some subset of the bucardo.customname table
    ## Arguments: zero or more
    ## 1+ Names to view. Can be "all" and can have wildcards
    ## Returns: 0 on success, -1 on error
    ## Example: bucardo list customname

    ## Grab our generic usage message
    my $doc_section = 'list';

    ## Might be no entries yet
    if (! keys %$CUSTOMNAME) {
        print "No customnames have been added yet\n";
        return -1;
    }

    my $cn = $CUSTOMNAME->{list};

    ## If not doing all, keep track of which to show
    my $matches = 0;

    for my $term (@nouns) {

        ## Special case for all: same as no nouns at all, so simply remove them!
        if ($term =~ /\ball\b/i) {
            undef @nouns;
            last;
        }

        ## Check for wildcards
        if ($term =~ s/[*%]/.*/) {
            for my $row (@$cn) {
                if ($row->{tname} =~ /$term/) {
                    $matches++;
                    $row->{match} = 1;
                }
            }
            next;
        }

        ## Must be an exact match
        for my $row (@$cn) {
            if ($row->{tname} eq $term) {
                $matches++;
                $row->{match} = 1;
            }
        }

    } ## end each term

    ## No matches?
    if (@nouns and ! $matches) {
        print "No matching customnames found\n";
        return -1;
    }

    ## Figure out the length of each item for a pretty display
    my ($maxid,$maxname,$maxnew,$maxsync,$maxdb) = (1,1,1,1,1);
    for my $row (@$cn) {
        next if @nouns and ! exists $row->{match};
        $maxid   = length $row->{id}      if length $row->{id}      > $maxid;
        $maxname = length $row->{tname}   if length $row->{tname}   > $maxname;
        $maxnew  = length $row->{newname} if length $row->{newname} > $maxnew;
        $maxsync = length $row->{sync}    if length $row->{sync}    > $maxsync;
        $maxdb   = length $row->{db}      if length $row->{db}      > $maxdb;
    }

    ## Now do the actual printing
    ## Sort by tablename, then newname, then sync, then db
    for my $row (sort {
        $a->{tname} cmp $b->{tname}
        or
        $a->{newname} cmp $b->{newname}
        or
        $a->{sync} cmp $b->{sync}
        or
        $a->{db} cmp $b->{db}
        } @$cn) {
        next if @nouns and ! exists $row->{match};
        printf '%-*s Table: %-*s => %-*s',
            1+$maxid, "$row->{id}.",
            $maxname, $row->{tname},
            $maxnew, $row->{newname};
        if ($row->{sync}) {
            printf ' Sync: %-*s',
                $maxsync, $row->{sync};
        }
        if ($row->{db}) {
            printf ' Database: %-*s',
                $maxsync, $row->{db};
        }
        print "\n";

    }

    return 0;

} ## end of list_customnames

sub find_goat_by_item {

    ## Finds a goat in the %GOAT hash, using one argument as a search key
    ## Arguments: name. Can be a goat id or a name, possibly including schema, or wildcards
    ##            nouns. Ref to array of other args; right now only supports "db=###"
    ## Results: An array of goat objects that match these keys

    my $name = shift;
    my $lnouns = shift;
    my @lnouns = ( defined $lnouns ? @$lnouns : ());

    $DEBUG and warn "Finding goats with name $name, noun: " . Dumper(@lnouns);

    my @results;

    ## Handle ID values
    if ($name =~ /^\d+$/) {
        $DEBUG and warn "$name is an ID value";
        push @results, $GOAT->{by_id}{$name};
    }
    ## Handle names, with or without schemas, and with or without wildcards
    else {
        $DEBUG and warn "$name is a name value";

        my @found_keys;

        ## Find GOAT keys that may include matches
        map {
            if (exists $GOAT->{$_}{$name}) {
                push @found_keys, [ $_, $name ];
            }
        } qw/by_table by_fullname/;

        ## Handle wildcards
        if (index($name, '*') >= 0 || index($name, '%') >= 0) {
            my $reg_name = $name;

            ## Change to a regexier form
            $reg_name =~ s/\./\\./g;
            $reg_name =~ s/[*%]/\.\*/g;
            $reg_name = "$reg_name" if $reg_name !~ /^[\^\.\%]/;
            $reg_name .= '$' if $reg_name !~ /[\$\*]$/;
            $DEBUG and warn "There's a wildcard here. This is the regex version: $reg_name";

            map {
                push @found_keys, [ 'by_fullname', $_ ];
            } grep { /$reg_name/ } keys %{$GOAT->{by_fullname}};
        }

        ## The found goat keys point to arrayrefs. Turn all that into a
        ## one-dimensional array of goats
        $DEBUG and warn 'Found these candidate keys: '. Dumper(@found_keys);
        map {
            for my $b (@{$GOAT->{$_->[0]}{$_->[1]}}) {
                push(@results, $b);
            }
        } @found_keys;
        $DEBUG and warn q{Here are the goats we've found, before filtering: } . Dumper(@results);
    }

    if (@results && defined $results[0] && @lnouns && defined $lnouns[0]) {
        my @filters = grep(/^(?:db|database)\s*=/, @lnouns);
        if (@filters) {
            ## The @lnouns array will only contain one db= value, even if the command includes several
            my $db_filter = $filters[0];

            $DEBUG and warn "Database filter starting value: $db_filter";
            $db_filter =~ /^(?:db|database)\s*=\s*(.+)/;
            $db_filter = $1;
            $DEBUG and warn "Database filter value: $db_filter";
            @results = grep {
                $DEBUG and warn "Comparing $_->{db} to filter value $db_filter";
                $_->{db} eq $db_filter;
            } @results;
        }
    }

    $DEBUG and warn 'Here are the filtered results: ' . Dumper(@results);
    @results = () if (@results and !defined $results[0]);

    return @results;

} ## end of find_goat_by_item

##
## Customcols-related subroutines: add, exists, remove, list
##

sub add_customcols {

    ## Add an item to the customcols table
    ## Arguments: none, parses nouns for tablename|goatid, syncname, database name
    ## Returns: never, exits
    ## Examples:
    ## bucardo add customcols public.foobar "select a,b,c"
    ## bucardo add customcols public.foobar "select a,b,c" db=foo
    ## bucardo add customcols public.foobar "select a,b,c" db=foo sync=abc

    my $item_name = shift @nouns || '';

    my $doc_section = 'add';

    ## Must have a clause as well
    my $clause = shift @nouns || '';

    usage_exit($doc_section) unless length $item_name && length $clause;

    ## Does this number or name exist?
    my @candidate_goats = find_goat_by_item($item_name);
    if (! @candidate_goats) {
        print qq{Could not find a matching table for "$item_name"\n};
        exit 1;
    }

# The code lower in the function is meant to handle multiple matching goats,
# but if we didn't want that, this would bleat when we ran into multiple goats.
#    if ($#candidate_goats > 0) {
#        print qq{Could not uniquely identify the desired table for "$item_name"\n};
#        print qq{Possible choices:\n};
#        print "\tdb: $_->{db}\tschema: $_->{schemaname}\ttable: $_->{tablename}\n"
#            for @candidate_goats;
#        exit 1;
#    }

    my $goat = $candidate_goats[0];
    my ($sname,$tname) = ($goat->{schemaname},$goat->{tablename});

    ## Make sure the clause looks sane
    if ($clause !~ /^\s*SELECT /i) {
        warn "\nThe clause must start with SELECT\n";
        usage_exit($doc_section);
    }

    ## Parse the rest of the arguments
    my (@sync,@db);
    for my $arg (@nouns) {
        ## Name of a sync
        if ($arg =~ /^sync\s*=\s*(.+)/) {
            my $sync = $1;
            if (! exists $SYNC->{$sync}) {
                print qq{No such sync: "$sync"\n};
                exit 1;
            }
            push @sync => $sync;
        }
        elsif ($arg =~ /^(?:db|database)\s*=\s*(.+)/) {
            my $db = $1;
            if (! exists $DB->{$db}) {
                print qq{No such database: "$db"\n};
                exit 1;
            }
            push @db => $db;
        }
        else {
            usage_exit($doc_section);
        }
    }

    ## Loop through and start adding rows to customcols
    my $goatid = $goat->{id};

    $SQL = "INSERT INTO bucardo.customcols(goat,clause,db,sync) VALUES ($goatid,?,?,?)";
    $sth = $dbh->prepare($SQL);

    ## We may have multiple syncs or databases, so loop through
    my $x = 0;
    my @msg;
    {
        ## Skip if this exact entry already exists
        next if customcols_exists($goatid,$clause,$db[$x],$sync[$x]);

        $count = $sth->execute($clause, $db[$x], $sync[$x]);
        my $message = qq{New columns for $sname.$tname: "$clause"};
        defined $db[$x] and $message .= " (for database $db[$x])";
        defined $sync[$x] and $message .= " (for sync $sync[$x])";
        push @msg => $message;

        ## Always go at least one round
        ## We go a second time if there is another sync or db waiting
        $x++;
        redo if defined $db[$x] or defined $sync[$x];
        last;
    }

    if (!$QUIET) {
        for (@msg) {
            chomp; ## Just in case we forgot above
            print "$_\n";
        }
    }

    confirm_commit();

    exit 0;

} ## end of add_customcols


sub remove_customcols {

    ## Remove one or more entries from the bucardo.customcols table
    ## Arguments: one or more
    ## 1+ IDs to be deleted
    ## Returns: undef
    ## Example: bucardo remove customcols 7

    my $doc_section = 'remove';
    usage_exit($doc_section) unless @nouns;

    ## Make sure each argument is a number
    for my $name (@nouns) {
        usage_exit($doc_section) if $name !~ /^\d+$/;
    }

    ## We want the per-id hash here
    my $cc = $CUSTOMCOLS->{id};

    ## Give a warning if a number does not exist
    for my $name (@nouns) {
        if (! exists $cc->{$name}) {
            $QUIET or warn qq{Customcols number $name does not exist\n};
        }
    }

    ## Prepare the SQL to delete each customcols
    $SQL = 'DELETE FROM bucardo.customcols WHERE id = ?';
    $sth = $dbh->prepare($SQL);

    ## Go through and delete any that exist
    for my $name (@nouns) {

        ## We've already handled these in the loop above
        next if ! exists $cc->{$name};

        ## Unlike other items, we do not need an eval,
        ## because it has no cascading dependencies
        $sth->execute($name);

        my $cc2 = sprintf '%s => %s%s%s',
            $cc->{$name}{tname},
            $cc->{$name}{clause},
            (length $cc->{$name}{sync} ? " Sync: $cc->{$name}{sync}" : ''),
            (length $cc->{$name}{db} ? " Database: $cc->{$name}{db}" : '');

        $QUIET or print qq{Removed customcols $name: $cc2\n};

    }

    confirm_commit();

    exit 0;

} ## end of remove_customcols


sub customcols_exists {

    ## See if an entry already exists in the bucardo.customcols table
    ## Arguments: four
    ## 1. Goat id
    ## 2. Clause
    ## 3. Database name (can be null)
    ## 4. Sync name (can be null)
    ## Returns: true or false (1 or 0)

    my ($id,$clause,$db,$sync) = @_;

    ## Easy if there are no entries yet!
    return 0 if ! keys %$CUSTOMCOLS;

    my $cc = $CUSTOMCOLS->{goat};

    ## Quick filtering by the goatid
    return 0 if ! exists $cc->{$id};

    ## And by the clause therein
    return 0 if ! exists $cc->{$id}{$clause};

    ## Is there a match for this db and sync combo?
    for my $row (@{ $cc->{$id}{$clause} }) {
        if (defined $db) {
            next if (! length $row->{db} or $row->{db} ne $db);
        }
        else {
            next if length $row->{db};
        }
        if (defined $sync) {
            next if (! length $row->{sync} or $row->{sync} ne $sync);
        }
        else {
            next if length $row->{sync};
        }

        ## Complete match!
        return 1;
    }

    return 0;

} ## end of customcols_exists


sub list_customcols {

    ## Show information about all or some subset of the bucardo.customcols table
    ## Arguments: zero or more
    ## 1+ Names to view. Can be "all" and can have wildcards
    ## Returns: 0 on success, -1 on error
    ## Example: bucardo list customcols

    my $doc_section = 'list';

    ## Might be no entries yet
    if (! keys %$CUSTOMCOLS) {
        print "No customcols have been added yet\n";
        return -1;
    }

    my $cc = $CUSTOMCOLS->{list};

    ## If not doing all, keep track of which to show
    my $matches = 0;

    for my $term (@nouns) {

        ## Special case for all: same as no nouns at all, so simply remove them!
        if ($term =~ /\ball\b/i) {
            undef @nouns;
            last;
        }

        ## Check for wildcards
        if ($term =~ s/[*%]/.*/) {
            for my $row (@$cc) {
                if ($row->{tname} =~ /$term/) {
                    $matches++;
                    $row->{match} = 1;
                }
            }
            next;
        }

        ## Must be an exact match
        for my $row (@$cc) {
            if ($row->{tname} eq $term) {
                $matches++;
                $row->{match} = 1;
            }
        }

    } ## end each term

    ## No matches?
    if (@nouns and ! $matches) {
        print "No matching customcols found\n";
        return -1;
    }

    ## Figure out the length of each item for a pretty display
    my ($maxid,$maxname,$maxnew,$maxsync,$maxdb) = (1,1,1,1,1);
    for my $row (@$cc) {
        next if @nouns and ! exists $row->{match};
        $maxid   = length $row->{id}     if length $row->{id}      > $maxid;
        $maxname = length $row->{tname}  if length $row->{tname}   > $maxname;
        $maxnew  = length $row->{clause} if length $row->{clause}  > $maxnew;
        $maxsync = length $row->{sync}   if length $row->{sync}    > $maxsync;
        $maxdb   = length $row->{db}     if length $row->{db}      > $maxdb;
    }

    ## Now do the actual printing
    ## Sort by tablename, then newname, then sync, then db
    for my $row (sort {
        $a->{tname} cmp $b->{tname}
        or
        $a->{clause} cmp $b->{clause}
        or
        $a->{sync} cmp $b->{sync}
        or
        $a->{db} cmp $b->{db}
        } @$cc) {
        next if @nouns and ! exists $row->{match};
        printf '%-*s Table: %-*s => %-*s',
            1+$maxid, "$row->{id}.",
            $maxname, $row->{tname},
            $maxnew, $row->{clause};
        if ($row->{sync}) {
            printf ' Sync: %-*s',
                $maxsync, $row->{sync};
        }
        if ($row->{db}) {
            printf ' Database: %-*s',
                $maxsync, $row->{db};
        }
        print "\n";

    }

    return 0;

} ## end of list_customcols


##
## Table-related subroutines: add, remove, update, list
##

sub add_table {
    my $reltype = shift;

    ## Add one or more tables or sequences. Inserts to the bucardo.goat table
    ## May also update the bucardo.herd and bucardo.herdmap tables
    ## Arguments: one. Also parses @nouns for table / sequence names
    ## 1. Type of object to be added: table, or sequence
    ## Returns: undef
    ## Example: bucardo add table pgbench_accounts foo% myschema.abc

    ## Grab our generic usage message
    my $doc_section = 'add/add table';
    usage_exit($doc_section) unless @nouns;

    ## Inputs and aliases, database column name, flags, default
    my $validcols = q{
        db                       db                   0                null
        autokick|ping            autokick             TF               null
        rebuild_index            rebuild_index        numeric          null
        analyze_after_copy       analyze_after_copy   TF               null
        makedelta                makedelta            0                null
        herd|relgroup            herd                 0                skip
        strict_checking          strict_checking      TF               1
    };

    my ( $dbcols, $cols, $phs, $vals, $extra ) = process_simple_args({
        cols        => $validcols,
        list        => \@nouns,
        doc_section => $doc_section,
    });

    ## Loop through all the args and attempt to add the tables
    ## This returns a hash with the following keys: relations, match, nomatch
    my $goatlist = get_goat_ids(args => \@nouns, type => $reltype, dbcols => $dbcols);

    ## The final output. Store it up all at once for a single QUIET check
    my $message = '';

    ## We will be nice and indicate anything that did not match
    if (keys %{ $goatlist->{nomatch} }) {
        $message .= "Did not find matches for the following terms:\n";
        for (sort keys %{ $goatlist->{nomatch} }) {
            $message .= "  $_\n";
        }
    }

    ## Now we need to output which ones were recently added
    if (keys %{ $goatlist->{new} }) {
        $message .= "Added the following tables or sequences:\n";
        for (sort keys %{ $goatlist->{new} }) {
            $message .= "  $_\n";
        }
    }

    ## If they requested a herd and it does not exist, create it
    if (exists $extra->{relgroup}) {
        my $herdname = $extra->{relgroup};
        if (! exists $HERD->{$herdname}) {
            $SQL = 'INSERT INTO bucardo.herd(name) VALUES(?)';
            $sth = $dbh->prepare($SQL);
            $sth->execute($herdname);
            $message .= qq{Created the relgroup named "$herdname"\n};
        }
        ## Now load all of these tables into this herd
        $SQL = 'INSERT INTO bucardo.herdmap (herd,priority,goat) VALUES (?,?,'
            . qq{ (SELECT id FROM goat WHERE schemaname||'.'||tablename=? AND db=? AND reltype='$reltype'))};

        $sth = $dbh->prepare($SQL);

        ## Which tables were already in the herd, and which were just added
        my (@oldnames,@newnames);

        for my $name (sort keys %{ $goatlist->{relations} }) {
            ## Is it already part of this herd?
            if (exists $HERD->{$herdname}{goat}{$name} and
                    $HERD->{$herdname}{goat}{$name}{reltype} eq $reltype) {
                push @oldnames => $name;
                next;
            }
            my $db = $goatlist->{relations}{$name}{goat}[0]{db};

            my $pri = 0;

            $count = $sth->execute($herdname,$pri,$name, $db);

            push @newnames => $name;
        }

        if (@oldnames) {
            $message .= qq{The following tables or sequences were already in the relgroup "$herdname":\n};
            for (@oldnames) {
                $message .= "  $_\n";
            }
        }

        if (@newnames) {
            $message .= qq{The following tables or sequences are now part of the relgroup "$herdname":\n};
            for (sort numbered_relations @newnames) {
                $message .= "  $_\n";
            }
        }

    } ## end if herd

    if (!$QUIET) {
        print $message;
    }

    confirm_commit();

    exit 0;

} ## end of add_table


sub remove_relation {

    my $reltype = shift;

    my $arg = shift || '';

    my $doc_section = 'remove';
    if (!@nouns and $arg ne 'all') {
        usage_exit($doc_section);
    }

    my $db_filter;
    for my $name ( @nouns ) {
        next unless $name =~ /^db=(.*)/;
        $db_filter = $1;
    }

    my @removed;

    if ($arg eq 'all') {
        if (! $bcargs->{batch}) {
            print "Are you sure you want to remove all ${reltype}s? ";
            exit if <STDIN> !~ /Y/i;
        }

        $SQL = q{DELETE FROM bucardo.goat WHERE id = ?};
        $sth = $dbh->prepare($SQL);

        for my $tid ( sort { $a <=> $b } keys %{$GOAT->{by_id}}) {
            my $t = $GOAT->{by_id}{$tid};
            next if $t->{reltype} ne $reltype;
            $count = $sth->execute($tid);
            if (1 == $count) {
                push @removed => "$t->{schemaname}.$t->{tablename}";
            }
        }
    }
    else {

        ## Prepare our SQL
        $SQL = q{DELETE FROM bucardo.goat WHERE reltype = ? AND schemaname||'.'||tablename = ?};
        $SQL .= ' AND db = ?' if $db_filter;
        $sth = $dbh->prepare($SQL);

        ## Bucardo won't fully support a table name that starts with "db=". Darn.
        for my $name (grep { ! /^db=/ } @nouns) {
            if ($name =~ /^\w[\w\d]*\.\w[\w\d]*$/) {
                if (! exists $GOAT->{by_fullname}{$name}) {
                    print qq{No such $reltype: $name\n};
                    next;
                }
                eval {
                    if ($db_filter) {
                        $sth->execute($reltype, $name, $db_filter);
                    }
                    else {
                        $sth->execute($reltype, $name);
                    }
                };
                if ($@) {
                    die qq{Could not delete $reltype "$name"\n$@\n};
                }
                push @removed, $name;
            }
            else {
                die qq{Please use the full schema.$reltype name\n};
            }
        }
    }

    if (@removed) {
        print "Removed the following ${reltype}s:\n";
        for my $name (sort numbered_relations @removed) {
            print qq{  $name} . ($db_filter ? " (DB: $db_filter)" : '') . "\n";
        }
        confirm_commit();
    }
    else {
        print "Nothing found to remove\n";
    }

    exit 0;

} ## end of remove_relation


sub update_table {

    ## Update one or more tables
    ## This may modify the bucardo.goat and bucardo.herdmap tables
    ## Arguments: two or more
    ## 1. Table to be updated
    ## 2+. Items to be adjusted (name=value)
    ## Returns: undef
    ## Example: bucardo update table quad ping=false

    my @actions = @_;

    my $doc_section = 'update/update table';
    usage_exit($doc_section) unless @actions;

    my $name = shift @actions;

    ## Recursively call ourselves for wildcards and 'all'
    exit 0 if ! check_recurse($GOAT, $name, @actions);

    ## Make sure this table exists!
    my @tables = find_goat_by_item($name, \@nouns);

    if (!@tables) {
        die qq{Didn't find any matching tables\n};
    }
    ## If this is an array, then see how many matches we have
    if ($#tables > 0) {
        die qq{More than one matching table: please use a schema\n};
    }
    my $table = $tables[0];

    ## Store the id so we work with that alone whenever possible
    my $id = $table->{id};

    ## Everything is a name=value setting after this point, except stuff that
    ##   matches /^db=/
    ## We will ignore and allow noise word "set"
    for my $arg (grep { ! /^db=/ } @actions) {
        next if $arg =~ /set/i;
        next if $arg =~ /\w+=\w+/o;
        usage_exit($doc_section);
    }

    ## Change the arguments into a hash
    my $args = process_args(join ' ' => ( grep { ! /^db=/ } @actions));

    ## Track what changes we made
    my %change;

    ## Walk through and handle each argument pair
    for my $setting (sort keys %$args) {

        next if $setting eq 'extraargs';

        ## Change the name to a more standard form, to better figure out what they really mean
        ## This also excludes all non-alpha characters
        my $newname = transform_name($setting);

        ## Exclude ones that cannot / should not be changed (e.g. cdate)
        if (exists $column_no_change{$newname}) {
            print "Sorry, the value of $setting cannot be changed\n";
            exit 1;
        }

        ## Standardize the values as well
        my $value = $args->{$setting};
        my $newvalue = transform_value($value);

        ## Handle all the non-standard columns
        if (lc $newname eq 'herd' || lc $newname eq 'relgroup') {

            ## Track the changes and publish at the end
            my @herdchanges;

            ## Grab the current hash of herds
            my $oldherd = $table->{herd} || '';

            ## Keep track of what groups they end up in, so we can remove as needed
            my %doneherd;

            ## Break apart into individual herds
            for my $herd (split /\s*,\s*/ => $newvalue) {

                ## Note that we've found this herd
                $doneherd{$herd}++;

                ## Does this herd exist?
                if (! exists $HERD->{$herd}) {
                    create_herd($herd);
                    push @herdchanges => qq{Created relgroup "$herd"};
                }

                ## Are we a part of it already?
                if ($oldherd and exists $oldherd->{$herd}) {
                    $QUIET or print qq{No change: table "$name" already belongs to relgroup "$herd"\n};
                }
                else {
                    ## We are not a part of this herd yet
                    add_goat_to_herd($herd, $id);
                    push @herdchanges => qq{Added table "$name" to relgroup "$herd"};
                }

            } ## end each herd specified

            ## See if we are removing any herds
            if ($oldherd) {
                for my $old (sort keys %$oldherd) {
                    next if exists $doneherd{$old};

                    ## We do not want to remove herds here, but maybe in the future
                    ## we can allow a syntax that does
                    next;

                    remove_table_from_herd($name, $old);
                    push @herdchanges => qq{Removed table "$name" from relgroup "$old"};
                }
            }

            if (@herdchanges) {
                for (@herdchanges) {
                    chomp;
                    $QUIET or print "$_\n";
                }
                confirm_commit();
            }

            ## Go to the next setting
            next;

        } ## end of 'herd' adjustments

        ## This must exist in our hash
        ## We assume it is the first entry for now
        ## Someday be more intelligent about walking and adjusting all matches
        if (! exists $table->{$newname}) {
            print qq{Cannot change "$newname"\n};
            next;
        }
        my $oldvalue = $table->{$newname};

        ## May be undef!
        $oldvalue = 'NULL' if ! defined $oldvalue;

        ## Has this really changed?
        if ($oldvalue eq $newvalue) {
            print "No change needed for $newname\n";
            next;
        }

        ## Add to the queue. Overwrites previous ones
        $change{$newname} = [$oldvalue, $newvalue];

    } ## end each setting

    ## If we have any changes, attempt to make them all at once
    if (%change) {
        my $SQL = 'UPDATE bucardo.goat SET ';
        $SQL .= join ',' => map { "$_=?" } sort keys %change;
        $SQL .= ' WHERE id = ?';
        my $sth = $dbh->prepare($SQL);
        eval {
            $sth->execute((map { $change{$_}[1] } sort keys %change), $id);
        };
        if ($@) {
            $dbh->rollback();
            $dbh->disconnect();
            print "Sorry, failed to update the relation. Error was:\n$@\n";
            exit 1;
        }

        for my $item (sort keys %change) {
            my ($old,$new) = @{ $change{$item} };
            print "Changed relation $item from $old to $new\n";
        }

        confirm_commit();
    }

    return;

} ## end of update_table


sub list_tables {

    ## Show information about all or some tables in the 'goat' table
    ## Arguments: none (reads nouns for a list of tables)
    ## Returns: 0 on success, -1 on error
    ## Example: bucardo list tables

    my $doc_section = 'list';

    ## Might be no tables yet
    if (! keys %$TABLE) {
        print "No tables have been added yet\n";
        return -1;
    }

    ## If not doing all, keep track of which to show
    my %matchtable;

    my @filters = grep { /^db=/ } @nouns;
    for my $term (grep { ! /^db=/ } @nouns) {

        ## Special case for all: same as no nouns at all, so simply remove them!
        if ($term =~ /\ball\b/i) {
            undef %matchtable;
            undef @nouns;
            last;
        }

        map { $matchtable{$_->{id}} = 1; } find_goat_by_item($term, \@filters);

    } ## end each term

    ## No matches?
    if (@nouns and ! keys %matchtable) {
        print "No matching tables found\n";
        return -1;
    }

    ## Figure out the length of each item for a pretty display
    my ($maxid,$maxname,$maxdb,$maxpk) = (1,1,1,1);
    for my $row (values %$TABLE) {
        my $id = $row->{id};
        next if @nouns and ! exists $matchtable{$id};
        $maxid   = length $id if length $id > $maxid;
        my $name = "$row->{schemaname}.$row->{tablename}";
        $maxname = length $name if length $name > $maxname;
        $maxdb = length $row->{db} if length $row->{db} > $maxdb;
        $row->{ppk} = $row->{pkey} ? "$row->{pkey} ($row->{pkeytype})" : 'none';
        $maxpk = length $row->{ppk} if length $row->{ppk} > $maxpk;
    }
    ## Now do the actual printing
    ## Sort by schemaname then tablename
    for my $row (sort numbered_relations values %$TABLE) {
        next if @nouns and ! exists $matchtable{$row->{id}};
        printf '%-*s Table: %-*s  DB: %-*s  PK: %-*s',
            1+$maxid, "$row->{id}.",
            $maxname, "$row->{schemaname}.$row->{tablename}",
            $maxdb, $row->{db},
            $maxpk, $row->{ppk};
        if ($row->{sync}) {
            printf '  Syncs: ';
            print join ',' => sort keys %{ $row->{sync} };
        }
        if (defined $row->{autokick}) {
            printf '  autokick:%s', $row->{autokick} ? 'true' : 'false';
        }
        if ($row->{rebuild_index}) {
            print '  rebuild_index:true';
        }
        if ($row->{makedelta}) {
            print "  (makedelta:$row->{makedelta})";
        }
        print "\n";

        $VERBOSE >= 2 and show_all_columns($row);
    }

    return 0;

} ## end of list_tables


##
## Herd-related subroutines: add, remove, update, list
##

sub add_herd {

    ## Add a herd aka relgroup. Inserts to the bucardo.herd table
    ## May also insert to the bucardo.herdmap and bucardo.goat tables
    ## Arguments: one or more
    ## 1. Name of the herd
    ## 2+ Names of tables or sequences to add. Can have wildcards
    ## Returns: undef
    ## Example: bucardo add herd foobar tab1 tab2

    my $doc_section = 'add/add relgroup';

    my $herdname = shift @nouns || '';

    ## Must have a name
    usage_exit($doc_section) unless length $herdname;

    ## Create the herd if it does not exist
    if (exists $HERD->{$herdname}) {
        print qq{Relgroup "$herdname" already exists\n};
    }
    else {
        create_herd($herdname);
        $QUIET or print qq{Created relgroup "$herdname"\n};
    }

    ## Everything else is tables or sequences to add to this herd

    ## How many arguments were we given?
    my $nouncount = @nouns;

    ## No sense going on if no nouns!
    if (! $nouncount) {
        confirm_commit();
        exit 0;
    }

    ## Get the list of all requested tables, adding as needed
    my $goatlist = get_goat_ids(args => \@nouns, noherd => $herdname);

    ## The final output. Store it up all at once for a single QUIET check
    my $message = '';

    ## We will be nice and indicate anything that did not match
    if (keys %{ $goatlist->{nomatch} }) {
        $message .= "Did not find matches for the following terms:\n";
        for (sort keys %{ $goatlist->{nomatch} }) {
            $message .= "  $_\n";
        }
    }

    ## Now we need to output which ones were recently added
    if (keys %{ $goatlist->{new} }) {
        $message .= "Added the following tables or sequences:\n";
        for (sort keys %{ $goatlist->{new} }) {
            $message .= "  $_ (DB: $goatlist->{relations}{$_}{goat}[0]{db})\n";
        }
    }

    ## Now load all of these tables into this herd
    $SQL = 'INSERT INTO bucardo.herdmap (herd,priority,goat) VALUES (?,?,'
        . q{ (SELECT id FROM goat WHERE schemaname||'.'||tablename=? AND db=?))};

    $sth = $dbh->prepare($SQL);

    my (@oldnames, @newnames);

    for my $name (sort keys %{ $goatlist->{relations} }) {
        ## Is it already part of this herd?
        if (exists $HERD->{goat}{$name}) {
            push @oldnames => $name;
            next;
        }

        my @a;
        eval {
            @a = @{$goatlist->{relations}{$name}{goat}};
        };

        my $doneit;
        for my $tmpgoat (@a) {
            next if exists $doneit->{$tmpgoat->{id}};
            my $db = $tmpgoat->{db};
            my $pri = 0;

            $count = $sth->execute($herdname,$pri,$name,$db);
            push @newnames => $name;
            $doneit->{$tmpgoat->{id}}++;
        }
    }

    if (@oldnames) {
        $message .= qq{The following tables or sequences were already in the relgroup "$herdname":\n};
        for (@oldnames) {
            $message .= "  $_\n";
        }
    }

    if (@newnames) {
        $message .= qq{The following tables or sequences are now part of the relgroup "$herdname":\n};
        for (@newnames) {
            $message .= "  $_\n";
        }
    }

    if (!$QUIET) {
        print $message;
    }

    confirm_commit();

    exit 0;

} ## end of add_herd


sub remove_herd {

    ## Usage: remove herd herdname [herd2 herd3 ...]
    ## Arguments: none, parses nouns
    ## Returns: never, exits

    my $doc_section = 'remove';
    usage_exit($doc_section) unless @nouns;

    my $herd = $global{herd};

    for my $name (@nouns) {
        if (! exists $herd->{$name}) {
            die qq{No such relgroup: $name\n};
        }
    }

    $SQL = 'DELETE FROM bucardo.herd WHERE name = ?';
    $sth = $dbh->prepare($SQL);
    for my $name (@nouns) {
        eval {
            $sth->execute($name);
        };
        if ($@) {
            if ($@ =~ /"sync_source_herd_fk"/) {
                die qq{Cannot delete relgroup "$name": must remove all syncs that reference it first\n};
            }
            die qq{Could not delete relgroup "$name"\n$@\n};
        }
    }

    for my $name (@nouns) {
        print qq{Removed relgroup "$name"\n};
    }

    $dbh->commit();

    exit 0;

} ## end of remove_herd


sub add_goat_to_herd {
    die "Adding to a relgroup not implemented yet\n";
}


sub list_herds {

    ## Show information about all or some subset of the 'herd' table
    ## Arguments: none, parses nouns for herd names
    ## Returns: 0 on success, -1 on error

    my $doc_section = 'list';

    ## Any nouns are filters against the whole list
    my $clause = generate_clause({col => 'name', items => \@nouns});
    my $WHERE = $clause ? "WHERE $clause" : '';
    $SQL = "SELECT * FROM bucardo.herd $WHERE ORDER BY name";
    $sth = $dbh->prepare($SQL);
    $count = $sth->execute();
    if ($count < 1) {
        $sth->finish();
        printf "There are no%s relgroups.\n",
            $WHERE ? ' matching' : '';
        return -1;
    }
    $info = $sth->fetchall_arrayref({});

    ## Get sizing information
    my $maxlen = 1;
    for my $row (@$info) {
        $maxlen = length $row->{name} if length $row->{name} > $maxlen;
    }

    for my $row (@$info) {
        my $name = $row->{name};
        my $h = $HERD->{$name};
        printf 'Relgroup: %-*s ',
            $maxlen, $name;
        printf ' DB: %s ', $h->{db} if $h->{db};
        ## Got goats?
        if (exists $h->{goat}) {
            print ' Members: ';
            print join ', ' => sort {
                $h->{goat}{$b}{priority} <=> $h->{goat}{$a}{priority}
                    or $a cmp $b
            } keys %{ $h->{goat} };
        }
        ## Got syncs?
        if (exists $h->{sync}) {
            print "\n  Used in syncs: ";
            print join ', ' => sort keys %{$h->{sync}};
        }
        print "\n";
        $VERBOSE >= 2 and show_all_columns($row);
    }

    return 0;

} ## end of list_herds

##
## Sync-related subroutines: add, remove, update, list
##


sub add_sync {

    ## Create a new sync by adding an entry to the bucardo.sync table
    ## Will add tables as needed to the bucardo.goat table
    ## Will create implicit relgroups as needed
    ## May modify the goat, herd, and herdmap tables
    ## Arguments: none (uses nouns)
    ## Returns: never, exits

    my $sync_name = shift @nouns || '';

    ## If the sync name does not exist or is empty, show a help screen
    my $doc_section = 'add/add sync';
    usage_exit($doc_section) if ! length $sync_name;

    ## If this named sync already exists, throw an exception
    if (exists $SYNC->{$sync_name}) {
        die qq{A sync with the name "$sync_name" already exists\n};
    }

    ## Store a list of messages we can output once we have no errors
    my @message;

    ## Inputs and aliases, database column name, flags, default
    my $validcols = qq{
        name                       name                 0                $sync_name
        relgroup|herd              relgroup             0                null
        stayalive                  stayalive            TF               null
        kidsalive                  kidsalive            TF               null
        autokick|ping              autokick             TF               null
        checktime                  checktime            interval         null
        strict_checking            strict_checking      TF               null
        status                     status               =active|inactive null
        priority                   priority             numeric          null
        analyze_after_copy         analyze_after_copy   TF               null
        overdue                    overdue              interval         null
        expired                    expired              interval         null
        track_rates                track_rates          TF               null
        onetimecopy                onetimecopy          =0|1|2           null
        lifetime                   lifetime             interval         null
        maxkicks                   maxkicks             numeric          null
        isolation_level|txnmode    isolation_level      0                null
        rebuild_index|rebuildindex rebuild_index        numeric          null
        dbgroup                    dbgroup              0                null

        conflict_strategy|standard_conflict|conflict conflict_strategy  0   null
        relation|relations|table|tables     tables             0   null
        db|databases|database|databases|dbs dbs                0   null
    };

    my $morph = [
                 ## Fullcopy syncs get some of their defaults overriden
                 ## The controllers and kids never start automatically,
                 ## and autokick is never on
                 {
                  field => 'synctype',
                  value => 'fullcopy',
                  new_defaults => 'autokick|F stayalive|F kidsalive|F',
                  },
                 ## We need isolation level to be dash free for SQL
                 {
                  field => 'isolation_level',
                  dash_to_white => 1,
                  }
                 ];

    ## Parse all of our arguments, and convert them per rules above
    ## We don't use cols and phs and vals in this particular sub!
    ## Others should be modified someday to also avoid them
    my ($dbcols) = process_simple_args({
        cols        => $validcols,
        list        => \@nouns,
        doc_section => $doc_section,
        morph       => $morph,
    });

    ## We must know what to replicate: need a relgroup or a list of tables
    if (! exists $dbcols->{relgroup} and ! exists $dbcols->{tables}) {
        die "Must specify a relgroup (or a list of tables) for this sync\n";
    }

    ## We must know where to replicate: need a dbgroup or a list of databases
    if (! exists $dbcols->{dbgroup} and ! exists $dbcols->{dbs}) {
        die "Need to specify which dbgroup (or list of databases) for this sync\n";
    }

    #### RELGROUP
    ## Determine what relgroup to use
    ## If one is given, use that; else create a new one
    my $relgroup_name;
    if (exists $dbcols->{relgroup}) {

        ## Simple case where they give us the exact relgroup
        if (exists $HERD->{ $dbcols->{relgroup} }) {

            ## We cannot have both an existing relgroup and a list of tables
            if (exists $dbcols->{tables}) {
                die "Cannot specify an existing relgroup and a list of tables\n";
            }

            $relgroup_name = $dbcols->{relgroup};
        }

        ## If the relgroup has commas, we treat it as a list of tables
        ## Otherwise, we create a new relgroup
        elsif ($dbcols->{relgroup} !~ /,/) {
            $relgroup_name = create_herd( $dbcols->{relgroup}, 'noreload' );
        }

    }

    ## DBGROUP
    ## Determine which dbgroup to use
    ## We create a unique name as needed later on
    my $dbgroup_name;
    if (exists $dbcols->{dbgroup}) {

        ## If this dbgroup already exists, we are done
        if (exists $DBGROUP->{ $dbcols->{dbgroup} }) {

            ## We cannot have both an existing dbgroup and a list of databases
            if (exists $dbcols->{dbs}) {
                die "Cannot specify an existing dbgroup and a list of databases\n";
            }

            $dbgroup_name = $dbcols->{dbgroup};
        }

        ## If the dbgroup has commas, we treat it as a list of databases
        ## Otherwise, we create a new dbgroup
        elsif ($dbcols->{dbgroup} !~ /,/) {
            $dbgroup_name = create_dbgroup( $dbcols->{dbgroup}, 'noreload' );
        }
    }

    ## Before we potentially create a unique dbgroup name
    ## we need to process all of our databases, to see
    ## if this combo matches an existing dbgroup

    #### DB
    ## Parse the list of databases to use
    ## Databases can come from both dbs and dbgroup - the latter only if it has commas
    my @dblist;
    if (exists $dbcols->{dbs}) {
        @dblist = split /\s*,\s*/ => $dbcols->{dbs};
    }
    if (exists $dbcols->{dbgroup} and $dbcols->{dbgroup} =~ /,/) {
        push @dblist => split /\s*,\s*/ => $dbcols->{dbgroup};
    }

    ## If this is a new dbgroup, databases must be given
    if (!@dblist and defined $dbgroup_name and ! exists $DBGROUP->{ $dbgroup_name }) {
        die qq{Must provide a list of databases to go into the new dbgroup\n};
    }

    my $dbtype = ''; ## the current database type (e.g. source, target)
    my %db; ## used to build matching list below
    my %rolecount; ## Keep track of types for later logic
    my $db_for_lookups; ## Which database to search for new tables

    for my $db (@dblist) {

        ## Set the default type of database: first is always source
        $dbtype = $dbtype eq '' ? 'source' : 'target';

        ## Extract the type if it has one
        if ($db =~ s/[=:](.+)//) {
            $dbtype = $1;
        }

        ## If this database is not known to us, throw an exception
        if (! exists $DB->{$db}) {
            ## This may be a dbgroup: we allow this if it is the only entry!
            if (exists $DBGROUP->{ $db } and ! defined $dblist[1]) {
                $dbgroup_name = $db;
                undef @dblist;
                last;
            }
            die qq{Unknown database "$db"\n};
        }

        ## Standardize and check the types
        $dbtype = 'source'
            if $dbtype =~ /^s/i or $dbtype =~ /^mas/i or $dbtype =~ /^pri/;
        $dbtype = 'target'
            if $dbtype =~ /^t/i or $dbtype =~ /^rep/i;
        $dbtype = 'fullcopy'
            if $dbtype =~ /^f/i;
        if ($dbtype !~ /^(?:source|target|fullcopy)$/) {
            die "Invalid database type: must be source, target, or fullcopy (not $dbtype)\n";
        }

        $db{$db} = $dbtype;
        $rolecount{$dbtype}++;

        $db_for_lookups = $db if $dbtype eq 'source';

    }

    ## If we were given dbgroup only, we still need to populate rolecount
    if (! @dblist) {
        for my $d (values %{ $DBGROUP->{ $dbgroup_name }{db} }) {
            $rolecount{$d->{role}}++;
        }
    }

    ## Do any existing groups match this list exactly?
    ## We only care about this if they don't have an explicit dbgroup set
    if (! defined $dbgroup_name) {
        my $newlist = join ',' => map { "$_=".$db{$_} } sort keys %db;
        for my $gname (sort keys %$DBGROUP) {
            my $innerjoin = join ',' =>
                map { "$_=".$DBGROUP->{$gname}{db}{$_}{role} }
                    sort keys %{$DBGROUP->{$gname}{db}};
            if ($innerjoin eq $newlist) {
                push @message => qq{Using existing dbgroup "$gname"};
                $dbgroup_name = $gname;
                last;
            }
        }
    }

    ## If we still don't have a dbgroup, create one based on the sync name
    if (! defined $dbgroup_name) {

        ## We will use the name of the sync if free
        ## Otherwise, keep adding numbers to it until we get a free name
        my $newname = $sync_name;
        for my $x (2..10_000) {
            last if ! exists $DBGROUP->{$newname};
            $newname = "${sync_name}_$x";
        }

        $dbgroup_name = create_dbgroup( $newname, 'noreload' );
    }

    ## Give a courtesy message is we created a new dbgroup
    ## Also associate our dbs with this new group
    if (! exists $DBGROUP->{ $dbgroup_name }) {
        push @message => qq{Created a new dbgroup named "$dbgroup_name"\n};
        $SQL = 'INSERT INTO bucardo.dbmap(dbgroup,db,role) VALUES (?,?,?)';
        $sth = $dbh->prepare($SQL);
        for my $db (sort keys %db) {
            $count = $sth->execute($dbgroup_name, $db, $db{$db});
            if (1 != $count) {
                die qq{Unable to add database "$db" to dbgroup "$dbgroup_name"\n};
            }
        }
    }

    ## Make sure we only use what the bucardo.sync table needs: dbs
    delete $dbcols->{dbgroup};
    $dbcols->{dbs} = $dbgroup_name; ## Someday, rename this column!

    ## TABLES
    ## Determine the tables to use
    ## Always check the first found source database
    ## We can get a list of tables via the relgroup argument,
    ## or from a tables argument. Handle both ways.
    my @tables;

    if (exists $dbcols->{relgroup} and $dbcols->{relgroup} =~ /,/) {
        @tables = split /\s*,\s*/ => $dbcols->{relgroup};
    }
    if (exists $dbcols->{tables}) {
        for my $table (split /\s*,\s*/ => $dbcols->{tables}) {
            push @tables => $table;
        }
    }

    ## Keep track of what we have already done
    my %table;

    for my $table (@tables) {

        ## Skip if we have seen this already
        next if exists $table{$table};

        ## If this table already exists, we are done
        if (exists $GOAT->{by_fullname}{$table}) {
            $table{$table} = $GOAT->{by_fullname}{$table}->[0];
            next;
        }

        my $result = get_goat_ids(args => [$table], dbcols => { db => $db_for_lookups} );
        my $found = keys %{ $result->{match} };

        for my $name (sort keys %{ $result->{new} }) {
            push @message => qq{  Added table "$name"};
        }

        ## If a specific table is not found, throw an exception
        if (!$found and $table !~ /^all/) {
            die qq{Could not find a relation named "$table"\n};
        }

        ## Save each table's information for use below
        for my $tname (sort keys %{ $result->{relations} }) {
            $table{$tname} ||= $result->{relations}{$tname}{goat}[0];
        }
     }

    ## If we don't have a relgroup already, see if our list matches an existing one
    if (! defined $relgroup_name and keys %table) {
        my $newlist = join ',' =>
            map { "$table{$_}{schemaname}.$table{$_}{tablename}"}
                sort { "$table{$a}->{schemaname}.$table{$a}->{tablename}"
                           cmp "$table{$b}->{schemaname}.$table{$b}->{tablename}"}
                    keys %table;
        for my $rname (sort keys %$RELGROUP) {
            my $innerjoin = join ',' => sort keys %{$RELGROUP->{$rname}{goat}};
            if ($innerjoin eq $newlist) {
                push @message => qq{Using existing relgroup "$rname"};
                $relgroup_name = $rname;
                last;
            }
        }
    }

    ## Now we can set a default relgroup based on the sync name if needed
    ## If we still don't have a relgroup, create one based on the sync name
    if (! defined $relgroup_name) {

        ## We will use the name of the sync if free
        ## Otherwise, keep adding numbers to it until we get a free name
        my $newname = $sync_name;
        for my $x (2..10_000) {
            last if ! exists $HERD->{$newname};
            $newname = "${sync_name}_$x";
        }

        $relgroup_name = create_herd( $newname, 'noreload' );
    }

    ## Give a courtesy message is we created a new relgroup
    ## Also associate our tables with this new group
    if (! exists $HERD->{ $relgroup_name }) {

        unshift @message => qq{Created a new relgroup named "$relgroup_name"\n};

        $SQL = 'INSERT INTO bucardo.herdmap(herd,goat) VALUES (?,?)';
        $sth = $dbh->prepare($SQL);

        for my $t (sort keys %table) {
            $count = $sth->execute($relgroup_name, $table{$t}{id});
            if (1 != $count) {
                die qq{Unable to add table "$t" to relgroup "$relgroup_name"\n};
            }
        }


    }

    ## Make sure we use relgroup but not tables for the SQL below
    delete $dbcols->{tables};
    delete $dbcols->{relgroup};
    $dbcols->{herd} = $relgroup_name;

    ## If this is a pure fullcopy sync, we want to turn stayalive and kidsalive off
    if ($rolecount{'source'} == 1
            and $rolecount{'fullcopy'}
                and ! $rolecount{'target'}) {
        $dbcols->{stayalive} = 0;
        $dbcols->{kidsalive} = 0;
    }

    ## Allow some alternate way to say things
    my $cs = 'conflict_strategy';
    if (exists $dbcols->{$cs}) {
        $dbcols->{$cs} = 'bucardo_latest'
            if $dbcols->{$cs} eq 'default' or $dbcols->{$cs} eq 'latest';
    }

    ## Attempt to insert this into the database
    my $columns = join ',' => keys %$dbcols;
    my $qs = '?,' x keys %$dbcols;
    chop $qs;
    $SQL = "INSERT INTO bucardo.sync ($columns) VALUES ($qs)";
    $DEBUG and warn "SQL: $SQL\n";
    $sth = $dbh->prepare($SQL);
    $DEBUG and warn Dumper values %$dbcols;
    eval {
        $count = $sth->execute(values %$dbcols);
    };
    if ($@) {
        die "Failed to add sync: $@\n";
    }

    $QUIET or print qq{Added sync "$sync_name"\n};

    ## Now we can output our success messages if any
    for my $msg (@message) {
        chomp $msg;
        $QUIET or print "$msg\n";
    }

    confirm_commit();

    exit 0;

} ## end of add_sync


sub remove_sync {

    ## Usage: remove sync name [name2 name3 ...]
    ## Arguments: none (uses nouns)
    ## Returns: never, exits

    my $doc_section = 'remove';
    usage_exit($doc_section) unless @nouns;

    ## Make sure all named syncs exist
    my $s = $global{sync};
    for my $name (@nouns) {
        if (! exists $s->{$name}) {
            die qq{No such sync: $name\n};
        }
    }

    ## Make sure none of the syncs are currently running
    ## XXX Is there anything we can do to check that the sync is active?

    $SQL = 'DELETE FROM bucardo.sync WHERE name = ?';
    $sth = $dbh->prepare($SQL);

    for my $name (@nouns) {
        eval {
            $sth->execute($name);
        };
        if ($@) {
            if ($@ =~ /"goat_db_fk"/) {
                die qq{Cannot delete sync "$name": must remove all tables that reference it first\n};
            }
            die qq{Could not delete sync "$name"\n$@\n};
        }
    }

    for my $name (@nouns) {
        print qq{Removed sync "$name"\n};
        print "Note: table triggers (if any) are not automatically removed!\n";
    }

    $dbh->commit();

    exit 0;

} ## end of remove_sync

sub update_sync {

    ## Update one or more syncs
    ## Arguments: none (reads nouns for a list of syncs)
    ## Returns: never, exits

    my @actions = @_;

    my $doc_section = 'update/update sync';
    usage_exit($doc_section) unless @actions;

    my $name = shift @actions;

    ## Recursively call ourselves for wildcards and 'all'
    exit 0 if ! check_recurse($SYNC, $name, @actions);

    ## Make sure this sync exists!
    if (! exists $SYNC->{$name}) {
        die qq{Could not find a sync named "$name"\nUse 'list syncs' to see all available.\n};
    }

    my $changes = 0;

    ## Current information about this sync, including column names
    my $syncinfo;

    my %aliases = (
        standard_conflict => 'conflict_strategy',
        conflict          => 'conflict_strategy',
        ping              => 'autokick',
        relgroup          => 'herd',
    );

    for my $action (@actions) {

        ## Skip noise words
        next if $action =~ 'set';

        ## Allow for some simple shortcuts
        if ($action =~/^inactiv/i) {
            $action = 'status=inactive';
        }
        elsif ($action =~ /^activ/i) {
            $action = 'status=active';
        }

        ## Look for a standard foo=bar or foo:bar format
        if ($action =~ /(.+?)\s*[=:]\s*(.+)/) {
            my ($setting,$value) = (lc $1,$2);

            ## No funny characters please, just boring column names
            $setting =~ /^[a-z_]+$/ or die "Invalid setting: $setting\n";
            $setting = $aliases{$setting} || $setting;

            ## If we have not already, grab the current information for this sync
            ## We also use this to get the list of valid column names to modify
            if (! defined $syncinfo) {
                $SQL = 'SELECT * FROM sync WHERE name = ?';
                $sth = $dbh->prepare($SQL);
                $count = $sth->execute($name);
                ## Check count
                $syncinfo = $sth->fetchall_arrayref({})->[0];
                for my $col (qw/ cdate /) {
                    delete $syncinfo->{$col};
                }
            }

            ## Is this a valid column?
            if (! exists $syncinfo->{$setting}) {
                die "Invalid setting: $setting\n";
            }

            ## Do any magic we need for specific items
            if ($setting eq 'isolation_level') {
                $value =~ s/_/ /g;
            }
            elsif ($setting eq 'conflict_strategy') {

                ## Allow some alternative names
                $value = 'bucardo_latest' if $value eq 'default' or $value eq 'latest';
                $value = 'bucardo_latest_all_tables' if $value eq 'latest_all';

                ## If the name does not start with bucardo, it must be a list of databases
                if ($value !~ /^bucardo_/) {
                    my $dbs = $SYNC->{$name}{dblist};
                    for my $dbname (split /\s+/ => $value) {
                        if (! exists $dbs->{$dbname}) {
                            die qq{conflict_strategy should contain a list of databases, but "$dbname" is not a db for this sync!\n};
                        }
                    }
                }

                $QUIET or print qq{Set conflict strategy to '$value'\n};
            }

            ## Try setting it
            $SQL = "UPDATE sync SET $setting=? WHERE name = ?";
            $sth = $dbh->prepare($SQL);
            $sth->execute($value,$name);
            $changes++;

            next;
        }

        warn "\nUnknown action: $action\n";
        usage_exit($doc_section);
    }

    confirm_commit() if $changes;

    return;

} ## end of update_sync


sub list_syncs {

    ## Show information about all or some subset of the 'sync' table
    ## Arguments: none (reads nouns for a list of syncs)
    ## Returns: 0 on success, -1 on error

    my $doc_section = 'list';

    my $syncs = $global{sync};

    ## Do we have at least one name specified (if not, show all)
    my $namefilter = 0;

    for my $term (@nouns) {

        ## Filter out by status: only show active or inactive syncs
        if ($term =~ /^(active|inactive)$/i) {
            my $stat = lc $1;
            for my $name (keys %$syncs) {
                delete $syncs->{$name} if $syncs->{$name}{status} ne $stat;
            }
            next;
        }

        ## Filter out by arbitrary attribute matches
        if ($term =~ /(\w+)\s*=\s*(\w+)/) {
            my ($attrib, $value) = (lc $1,$2);
            for my $name (keys %$syncs) {
                if (! exists $syncs->{$name}{$attrib}) {
                    my $message = "No such sync attribute: $attrib\n";
                    $message .= "Must be one of the following:\n";
                    my $names = join ',' =>
                        sort
                        grep { $_ !~ /\b(?:cdate|name)\b/ }
                        keys %{ $syncs->{$name} };
                    $message .= " $names\n";
                    die $message;
                }
                delete $syncs->{$name} if $syncs->{$name}{$attrib} ne $value;
            }
            next;
        }

        ## Everything else should be considered a sync name
        $namefilter = 1;

        ## Check for wildcards
        if ($term =~ s/[*%]/.*/) {
            for my $name (keys %$syncs) {
                $syncs->{$name}{ok2show} = 1 if $name =~ /$term/;
            }
            next;
        }

        ## Must be an exact match
        for my $name (keys %$syncs) {
            $syncs->{$name}{ok2show} = 1 if $name eq $term;
        }

    }

    ## If we filtered by name, remove all the non-matched ones
    if ($namefilter) {
        for my $name (keys %$syncs) {
            delete $syncs->{$name} if ! exists $syncs->{$name}{ok2show};
        }
    }

    ## Nothing found? We're out of here
    if (! keys %$syncs) {
        print "No syncs found\n";
        return -1;
    }

    ## Determine the size of the output strings for pretty aligning later
    my ($maxname, $maxherd, $maxdbs) = (2,2,2);
    for my $name (keys %$syncs) {
        my $s = $syncs->{$name};        $maxname = length $name if length $name > $maxname;
        $maxherd = length $s->{herd}{name} if length $s->{herd}{name} > $maxherd;
        $s->{d} = qq{DB group "$s->{dbs}"};
        for (sort keys %{ $s->{dblist} }) {
            $s->{d} .= " $_:$s->{dblist}{$_}{role}";
        }
        $maxdbs = length $s->{d} if length $s->{d} > $maxdbs;
    }

    ## Now print them out in alphabetic order
    for my $name (sort keys %$syncs) {
        my $s = $syncs->{$name};

        ## Switch to multi-line if database info strings are over this
        my $maxdbline = 50;

        ## Show basic information
        printf qq{Sync %-*s  Relgroup %-*s %s[%s]\n},
            2+$maxname, qq{"$name"},
            2+$maxherd, qq{"$s->{herd}{name}"},
            $maxdbs > $maxdbline ? '' : " $s->{d}  ",
            ucfirst $s->{status};

        ## Print the second line if needed
        if ($maxdbs > $maxdbline) {
            print "  $s->{d}\n";
        }

        ## Show associated tables if in verbose mode
        if ($VERBOSE >= 1) {
            if (exists $s->{herd}{goat}) {
                my $goathash = $s->{herd}{goat};
                for my $relname (sort {
                                     $goathash->{$b}{priority} <=> $goathash->{$a}{priority}
                                     or $a cmp $b
                                   }
                              keys %{ $goathash }) {
                    printf "  %s %s\n",
                        ucfirst($goathash->{$relname}{reltype}),$relname;
                }
            }
        }

        ## Show all the sync attributes
        $VERBOSE >= 2 and show_all_columns($s);

    } ## end of each sync

    return 0;

} ## end of list_syncs


sub get_goat_ids {

    ## Returns the ids from the goat table for matching relations
    ## Also checks the live database and adds tables to the goat table as needed.
    ## Arguments: key-value pairs:
    ##  - args: arrayref of names to match against. Can have wildcards. Can be 'all'
    ##  - type: 'table' or 'sequence', depending on what we expect to find.
    ##  - dbcols: optional hashref of fields to populate goat table with (e.g. autokick=1)
    ##  - noherd: do not consider items if already in this herd for "all"
    ## Returns: a hash with:
    ##  - relations: hash of goat objects, key is the fully qualified name
    ##    - original: hash of search term(s) used to find this
    ##    - goat: the goat object
    ##  - nomatch: hash of non-matching terms
    ##  - match: hash of matching terms
    ##  - new: hash of newly added tables

    my %arg = @_;
    my $reltype = $arg{type};
    my $names = $arg{args} or die 'Must have list of things to match';
    my $dbcols = $arg{dbcols} || {};
    my $noherd = $arg{noherd} || '';

    ## The final hash we return
    my %relation;

    ## Args that produced a match
    my %match;

    ## Args that produced no matches at all
    my %nomatch;

    ## Keep track of which args we've already done, just in case there are dupes
    my %seenit;

    ## Which tables we added to the goat table
    my %new;

    ## Figure out which database to search in, unless already given
    my $bestdb = (exists $dbcols->{db} and defined $dbcols->{db})
    ? $dbcols->{db} : find_best_db_for_searching();

    ## This check still makes sense: if no databases, there should be nothing in $GOAT!
    if (! defined $bestdb) {
        die "No databases have been added yet, so we cannot add tables!\n";
    }

    ## Allow "tables=all" to become "all"
    for my $item (@$names) {
        $item = 'all' if $item =~ /^tables?=all/i;
    }

    my $rdbh = connect_database({name => $bestdb}) or die;

    ## SQL to find a table or a sequence
    ## We do not want pg_table_is_visible(c.oid) here
    my $BASESQL = sub {
        my $arg = shift || 'table';
            ## Assume we're talking about tables unless we say "sequence" explicitly
        my $type = ( $arg eq 'sequence' ? 'S' : 'r' );
        return qq{
SELECT nspname||'.'||relname AS name, relkind, c.oid, relhaspkey, nspname, relname
FROM pg_class c
JOIN pg_namespace n ON (n.oid = c.relnamespace)
WHERE relkind IN ('$type')
AND nspname <> 'information_schema'
AND nspname !~ '^pg_'
};
};

    ## Loop through each argument, and try and find matching goats
  ITEM: for my $item (@$names) {

        ## In case someone entered duplicate arguments
        next if $seenit{$item}++;

        ## Skip if this is not a tablename, but an argument of the form x=y
        next if index($item, '=') >= 0;

        ## Determine if this item has a dot in it, and/or it is using wildcards
        my $hasadot = index($item,'.') >= 0 ? 1 : 0;
        my $hasstar = (index($item,'*') >= 0 or index($item,'%') >= 0) ? 1 : 0;

        ## Temporary list of matching items
        my @matches;

        ## A list of tables to be bulk added to the goat table
        my @addtable;

        ## We may mutate the arg, so stow away the original
        my $original_item = $item;

        ## We look for matches in the existing $GOAT hash
        ## We may also check the live database afterwards
        map {
            push @matches, $_ if (! defined $reltype || $_->{reltype} eq $reltype);
        } find_goat_by_item($item, \@nouns);

        ## Wildcards?
        my $regex_item = $item;

        ## Setup the SQL to search the live database
        if ($hasstar) {
            ## Change to a regexier form
            $regex_item =~ s/\./\\./g;
            $regex_item =~ s/[*%]/\.\*/g;
            $regex_item = "^$regex_item" if $regex_item !~ /^[\^\.\%]/;
            $regex_item .= '$' if $regex_item !~ /[\$\*]$/;

            ## Setup the SQL to search the live database
            $SQL = $BASESQL->($reltype) . ($hasadot
                ? q{AND nspname||'.'||relname ~ ?}
                : 'AND relname ~ ?');

        } ## end wildcards
        elsif ($hasadot) {
            ## A dot with no wildcards: exact match
            ## TODO: Allow foobar. to mean foobar.% ??
            $SQL = $BASESQL->($reltype) . q{AND nspname||'.'||relname = ?};
        }
        else {
            ## No wildcards and no dot, so we match all tables regardless of the schema
            $SQL = $BASESQL->($reltype);
            $item eq 'all' or $SQL .= 'AND relname = ?';
        }

        ## We do not check the live database if the match was exact
        ## *and* something was found. In all other cases, we go live.
        if ($hasstar or !$hasadot or !@matches) {
            debug(qq{NB! Found some existing matches; searching for other possibilities, because "$item" }
                . ( $hasstar ? 'includes wildcard characters ' : '' )
                . ( !$hasadot ? 'does not include a dot' : '' )) if @matches;
            ## Search the live database for matches
            $sth = $rdbh->prepare($SQL);
            $regex_item ||= $item;
            if ('all' eq $item) {
                ($count = $sth->execute()) =~ s/0E0/0/;
            }
            else {
                ($count = $sth->execute($regex_item)) =~ s/0E0/0/;
            }
            debug(qq{Searched live database "$bestdb" for arg "$regex_item", count was $count});
            debug(qq{SQL: $SQL}, 2);
            debug(qq{Arg: $item ($regex_item)}, 2);
            for my $row (@{ $sth->fetchall_arrayref({}) }) {

                ## The 'name' is combined "schema.relname"
                my $name = $row->{name};

                ## Don't bother if we have already added this!
                next if find_goat_by_item($name, [ "db=$bestdb" ]);

                ## If we are doing 'all', exclude the bucardo schema, and insist on a primary key
                if ('all' eq $item) {
                    next if $name =~ /^bucardo\./;
                    if (!$row->{relhaspkey}) {
                        ## Allow if we have a unique index on this table
                        $SQL = q{SELECT 1 FROM pg_index WHERE indisunique AND indrelid = }
                            . q{(SELECT c.oid FROM pg_class c JOIN pg_namespace n ON (n.oid = c.relnamespace) WHERE n.nspname=? AND c.relname=?)};
                        my $sthunique = $rdbh->prepare_cached($SQL);
                        $count = $sthunique->execute($row->{nspname},$row->{relname});
                        $sthunique->finish();
                        next if $count < 1;
                    }
                }

                ## Document the string that led us to this one
                $relation{$name}{original}{$item}++;

                ## Document the fact that we found this on a database
                $new{$name}++;

                ## Mark this item as having produced a match
                $match{$item}++;

                ## Set this table to be added to the goat table below
                push @addtable, {name => $name, db => $bestdb, reltype => $row->{relkind}, dbcols => $dbcols};

            }
        }

        ## Add all the tables we just found from searching the live database
        my $added_tables;
        if (@addtable) {
            $added_tables = add_items_to_goat_table(\@addtable);
        }
        for my $tmp (@$added_tables) {
            push @matches, $GOAT->{by_id}{$tmp};
        }

        ## If we asked for "all", add in all of our known tables (not already in this herd)
        if ($names->[0] eq 'all') {
            for (values %{ $GOAT->{by_db}{$bestdb} }) {
                next if exists $_->{herd}{$noherd};
                push @matches, $_;
            }
        }

        ## Populate the final hashes based on the match list
        for my $match (@matches) {
            next unless defined $match;
            my $name;
            if (ref $match eq 'HASH') {
                $name = "$match->{schemaname}.$match->{tablename}";
            }
            else {
                $name = $match;
            }
            $relation{$name}{original}{$original_item}++;

            ## This goat entry should be an array, if there are multiple goats
            ## with that name (e.g. from different databases)
            if (exists $relation{$name}{goat}) {
                push @{$relation{$name}{goat}}, $match;
            }
            else {
                $relation{$name}{goat} = [ $match ];
            }
            $match{$item}++;
        }

        ## If this item did not match anything, note that as well
        if (! @matches and $names->[0] ne 'all') {
            $nomatch{$original_item}++;
        }

    } ## end each given needle

    return {
        relations  => \%relation,
        nomatch    => \%nomatch,
        match      => \%match,
        new        => \%new,
    };

} ## end of get_goat_ids


sub add_items_to_goat_table {

    ## Given a list of tables, add them to the goat table as needed
    ## Arguments: one
    ## 1. Arrayref where keys are:
    ##   - name: name of relation to add (mandatory)
    ##   - db: the database name (mandatory)
    ##   - reltype: table or sequence (optional, defaults to table)
    ##   - dbcols: optional hashref of goat columns to set
    ## Returns: arrayref with all the new goat.ids

    my $info = shift or die;

    ## Quick check if the entry is already there.
    $SQL = 'SELECT id FROM bucardo.goat WHERE schemaname=? AND tablename=? AND db=?';
    my $isthere = $dbh->prepare($SQL);

    ## SQL to add this new entry in
    my $NEWGOATSQL = 'INSERT INTO bucardo.goat (schemaname,tablename,reltype,db) VALUES (?,?,?,?) RETURNING id';

    my @newid;

    for my $rel (sort { $a->{name} cmp $b->{name} } @$info) {
        # XXX Is it safe to assume UTF8 encoding here? Probably not
        my $name = $rel->{name};
        if ($name !~ /^([-\w ]+)\.([-\w ]+)$/o) {
            die qq{Invalid name, got "$name", but expected format "schema.relname"};
        }
        my ($schema,$table) = ($1,$2);

        my $db = $rel->{db} or die q{Must provide a database};

        my $reltype = $rel->{reltype} || 't';
        $reltype = $reltype =~ /s/i ? 'sequence' : 'table';

        ## Adjust the SQL as necessary for this goat
        $SQL = $NEWGOATSQL;
        my @args = ($schema, $table, $reltype, $db);
        if (exists $rel->{dbcols}) {
            for my $newcol (sort keys %{ $rel->{dbcols} }) {
                next if $newcol eq 'db';
                $SQL =~ s/\)/,$newcol)/;
                $SQL =~ s/\?,/?,?,/;
                push @args => $rel->{dbcols}{$newcol};
            }
        }
        $sth = $dbh->prepare($SQL);
        ($count = $sth->execute(@args)) =~ s/0E0/0/;

        debug(qq{Added "$schema.$table" with db "$db", count was $count});

        push @newid => $sth->fetchall_arrayref()->[0][0];
    }

    ## Update the global
    load_bucardo_info('force_reload');

    ## Return a list of goat IDs we've just added
#    my %newlist;
#    for my $id (@newid) {
#        my $goat = $global{goat}{by_id}{$id};
#        my $name = "$goat->{schemaname}.$goat->{tablename}";
#        $newlist{$name} = $goat;
#    }

    return \@newid;


} ## end of add_items_to_goat_table


sub create_dbgroup {

    ## Creates a new entry in the bucardo.dbgroup table
    ## Caller should have alredy checked for existence
    ## Does not commit
    ## Arguments: two
    ## 1. Name of the new group
    ## 2. Boolean: if true, prevents the reload
    ## Returns: name of the new group

    my ($name,$noreload) = @_;

    $SQL = 'INSERT INTO bucardo.dbgroup(name) VALUES (?)';
    $sth = $dbh->prepare($SQL);
    eval {
        $sth->execute($name);
    };
    if ($@) {
        if ($@ =~ /dbgroup_name_sane/) {
            print "Trying name $name\n";
            print qq{Invalid characters in dbgroup name "$name"\n};
        }
        else {
            print qq{Failed to create dbgroup "$name"\n$@\n};
        }
        exit 1;
    }

    ## Reload our hashes
    $noreload or load_bucardo_info(1);

    return $name;

} ## end of create_dbgroup


sub get_arg_items {

    ## From an argument list, return all matching items
    ## Arguments: two
    ## 1. Arrayref of source items to match on
    ## 2. Arrayref of arguments
    ## Returns: an arrayref of matches, or an single scalar indicating what arg failed

    my ($haystack, $needles) = @_;

    my %match;

    for my $needle (@$needles) {

        my $hasadot = index($needle,'.') >= 0 ? 1 : 0;
        my $hasstar = (index($needle,'*') >= 0 or index($needle,'%') >= 0) ? 1 : 0;

        ## Wildcards?
        if ($hasstar) {

            ## Change to a regexier form
            $needle =~ s/\*/\.\*/g;

            ## Count matches: if none found, we bail
            my $found = 0;
            for my $fullname (@$haystack) {
                ## If it has a dot, match the whole thing
                if ($hasadot) {
                    if ($fullname =~ /^$needle$/) {
                        $match{$fullname} = $found++;
                    }
                    next;
                }

                ## No dot, so match table part only
                my ($schema,$table) = split /\./ => $fullname;
                if ($table =~ /^$needle$/) {
                    $match{$fullname} = $found++;
                }
            }

            return $needle if ! $found;

            next;

        } ## end wildcards

        ## If it has a dot, it must match exactly
        if ($hasadot) {
            if (grep { $_ eq $needle } @$haystack) {
                $match{$needle} = 1;
                next;
            }
            return $needle;
        }

        ## No dot, so we match all tables regardless of the schema
        my $found = 0;
        for my $fullname (@$haystack) {
            my ($schema,$table) = split /\./ => $fullname;
            if ($table eq $needle) {
                $match{$fullname} = $found++;
            }
        }
        return $needle if ! $found;

    } ## end each given needle


    return \%match; ## May be undefined

} ## end of get_arg_items


sub clone {

    ## Put an entry in the clone table so the MCP can do some copyin'
    ## Arguments: none, parses nouns
    ## Returns: never, exits

    my $doc_section = 'clone';

    usage_exit($doc_section) unless @nouns;

    ## Examples:
    ## ./bucardo clone dbs=A:source,B,C relgroup=foo
    ## ./bucardo clone sync=foobar
    ## ./bucardo clone sync=foobar prime=A
    ## ./bucardo clone dbs=A,B,C,D relgroup=foo notruncate=B,C

    ## Optional sync to associate with:
    my $sync;

    ## Optional database group to use:
    my $dbgroup;

    ## The prime (winning) source database.
    my $prime;

    ## Optonal relgroup. Can be a list of tables
    my $relgroup;

    ## Optional options :)
    my $options;

    for my $word (@nouns) {

        ## Check for an optional sync name.
        if ($word =~ /(?i)sync(?-i)\s*[:=]\s*(\w.*?)\s*$/) {
            my $syncname = $1;
            if (! exists $SYNC->{$syncname}) {
                die qq{Invalid sync "$syncname"\n};
            }
            ## Have we already specified a sync?
            if (defined $sync) {
                die qq{Cannot specify more than one sync\n};
            }

            $sync = $syncname;
            next;
        }

        ## Check for an optional dbgroup
        if ($word =~ /(?i)dbg(?-i)\w*\s*[:=]\s*(\w.*?)\s*$/) {
            my $dbgroupname = $1;
            if (! exists $DBGROUP->{$dbgroupname}) {
                die qq{Invalid database group "$dbgroupname"\n};
            }
            ## Have we already specified a database group?
            if (defined $dbgroup) {
                die qq{Cannot specify more than one database group\n};
            }
            $dbgroup  = $dbgroupname;
            next;
        }

        ## Check for an optional relgroup
        if ($word =~ /(?i)(?:relgroup|table)s?(?-i)\w*\s*[:=]\s*(\w.*?)\s*$/) {
            my $relgroupname = $1;
            ## May be a relgroup, or a list of tables
            if (exists $RELGROUP->{$relgroupname}) {
                $relgroup = $relgroupname;
                next;
            }
            ## Must be one or more tables. See if we can find them, and shove into a relgroup

            ## Go through all the items and try to find matches
            ## Assumes tables are all in CSV format
            my @tablelist = split /\s*,\s*/ => $relgroupname;
            my $goatlist = get_goat_ids(args => \@tablelist, type => 'table');

            ## Cannot proceed unless we have a match for every table
            if (keys %{ $goatlist->{nomatch} }) {
                print "Cannot clone because the following tables were not found:\n";
                for my $badname (sort keys %{ $goatlist->{nomatch} }) {
                    print "  $badname\n";
                }
                exit 1;
            }

            ## We need to generate a relgroup name
            ## TODO: See if any existing relgroups match exactly
            my $basename = 'clone_relgroup';
            my $number = 1;
            {
                $relgroupname = "$basename$number";
                last if ! exists $RELGROUP->{$relgroupname};
                $number++;
                redo;
            }

            $SQL = 'INSERT INTO bucardo.herd(name) VALUES (?)';
            $sth = $dbh->prepare($SQL);
            $sth->execute($relgroupname);

            $SQL = 'INSERT INTO bucardo.herdmap (herd,goat) VALUES (?,?)';
            $sth = $dbh->prepare($SQL);
            for my $goat (values %{ $goatlist->{relations} }) {
                $sth->execute($relgroupname, $goat->{goat}[0]{id});
            }

            next;
        }

        ## Check for a prime
        if ($word =~ /(?i)prime(?-i)\w*\s*[:=]\s*(\w.*?)\s*$/) {
            $prime = $1;
            for my $candidate (split /\s*,\s*/ => $prime) {
                ## This must be a valid database
                if (! exists $DB->{$candidate}) {
                    die qq{The prime option must specify a known database (not "$candidate")\n};
                }
            }
            $options .= "prime=$prime;";
            next;
        }

        die qq{Unknown option: $word\n};

    } ## end checking each noun

    ## Must have at least one of sync or dbgroup
    if (! defined $sync and ! defined $dbgroup) {
        die qq{Must provide a sync or a database group\n};
    }

    ## Generate a list of databases to make sure we know which is prime
    my $dbrole;
    if (defined $dbgroup) {
        for my $row (values %{ $DBGROUP->{$dbgroup}{db} }) {
            $dbrole->{ $row->{role} }{ $row->{db} } = 1;
        }
    }
    else {
        for my $db (values %{ $SYNC->{$sync}{dblist} }) {
            $dbrole->{ $db->{role} }{ $db->{db} } = 1;
        }
    }

    ## If we have more than one source, make sure we know how to proceed
    if (keys %{ $dbrole->{source}} > 1) {
        ## TODO: Allow more than one somehow
        if (! defined $prime) {
            warn qq{Must provide a prime so we know which database to copy from\n};
            my $dblist = join ', ' => sort keys %{ $dbrole->{source} };
            warn qq{Should be one of: $dblist\n};
            exit 1;
        }
    }

    ## Clean up the options by removing any trailing semicolons
    if (defined $options) {
        $options =~ s/;$//;
    }

    $SQL = 'INSERT INTO bucardo.clone(status,sync,dbgroup,relgroup,options) VALUES (?,?,?,?,?) RETURNING id';
    $sth = $dbh->prepare($SQL);
    $sth->execute('new', $sync, $dbgroup, $relgroup, $options);
    my $id = $sth->fetchall_arrayref()->[0][0];

    ## Tell the MCP there is a new clone
    $dbh->do('NOTIFY bucardo_clone_ready');

    confirm_commit();

    $QUIET or print qq{Clone $id has been started. Track progress with "bucardo status clone $id"\n};

    exit 0;

} ## end of clone



sub kick {

    ## Kick one or more syncs
    ## Arguments: none, parses nouns
    ## Returns: never, exits

    my $doc_section = 'kick';
    usage_exit($doc_section) unless @nouns;

    my ($exitstatus, $retries, $do_retry) = (0,0,0);

  RETRY: {
        $dbh->rollback();
        $exitstatus = 0;
      SYNC: for my $sync (@syncs) {
            my $relname = "bucardo_kick_sync_$sync";

            ## If this sync is not active, cowardly refuse to kick it
            if ($SYNC->{$sync}{status} ne 'active') {
                print qq{Cannot kick inactive sync "$sync"\n};
                next SYNC;
            }

            $dbh->do(qq{NOTIFY "bucardo_kick_sync_$sync"});
            my $done = "bucardo_syncdone_$sync";
            my $killed = "bucardo_synckill_$sync";
            if (! defined $adverb) {
                $dbh->commit();
                $QUIET or print qq{Kicked sync $sync\n};
                next;
            }

            $QUIET or print qq{Kick $sync: };
            $dbh->do(qq{LISTEN "$done"});
            $dbh->do(qq{LISTEN "$killed"});
            $dbh->commit();

            my $time = time;
            sleep 0.1;

            my $timeout = (defined $adverb and $adverb > 0) ? $adverb : 0;

            my $printstring = $NOTIMER ? '' : '[0 s] ';
            print $printstring unless $QUIET or $NOTIMER;
            my $oldtime = 0;
            local $SIG{ALRM} = sub { die 'Timed out' };
            $do_retry = 0;
            eval {
                if ($timeout) {
                    alarm $timeout;
                }
              WAITIN: {
                    my $lastwait = '';
                    if (time - $time != $oldtime) {
                        $oldtime = time - $time;
                        if (!$QUIET and !$NOTIMER) {
                            print "\b" x length($printstring);
                            $printstring =~ s/\d+/$oldtime/;
                            print $printstring;
                        }
                    }
                    for my $notice (@{ db_get_notices($dbh) }) {
                        my ($name) = @$notice;
                        if ($name eq $done) {
                            $lastwait = 'DONE!';
                        }
                        elsif ($name eq $killed) {
                            $lastwait = 'KILLED!';
                            $exitstatus = 2;
                        }
                        elsif ($name =~ /^bucardo_syncdone_${sync}_(.+)$/) {
                            my $new = sprintf '%s(%ds) ', $1, ceil(time-$time);
                            print $new unless $QUIET;
                            $printstring .= $new;
                        }
                        elsif ($name =~ /^bucardo_synckill_${sync}_(.+)$/) {
                            my $new = sprintf '%s KILLED (%ds) ', $1, ceil(time-$time);
                            print $new unless $QUIET;
                            $printstring .= $new;
                            $exitstatus = 2;
                            $lastwait = ' ';
                        }
                    }
                    $dbh->rollback();
                    if ($lastwait) {
                        print $lastwait unless $QUIET;
                        if ($lastwait ne 'DONE!' and $RETRY and ++$retries <= $RETRY) {
                            print "Retry #$retries\n";
                            $do_retry = 1;
                            die "Forcing eval to exit for retry attempt\n";
                        }
                        last WAITIN;
                    }
                    sleep($WAITSLEEP);
                    redo WAITIN;

                } ## end of WAITIN

                alarm 0 if $timeout;
            };

            alarm 0 if $timeout;
            if ($do_retry) {
                $do_retry = 0;
                redo RETRY;
            }

            if (2 == $exitstatus) {
                my $reason = show_why_sync_killed($sync);
                $reason and print "\n$reason\n";
            }

            if ($@) {
                if ($@ =~ /Timed out/o) {
                    $exitstatus = 1;
                    warn "Timed out!\n";
                }
                else {
                    $exitstatus = 3;
                    warn "Error: $@\n";
                }
                next SYNC;
            }
            next SYNC if $QUIET;

            print "\n";

        } ## end each sync

    } ## end RETRY

    exit $exitstatus;

} ## end of kick


sub pause_resume {

    ## Pause or resume one or more syncs
    ## Arguments: none, parses nouns
    ## Returns: never, exits

    my $doc_section = 'pause';
    usage_exit($doc_section) unless @nouns;

    my $action = shift;

    my @syncs_signalled;
    for my $sync (@syncs) {

        ## Syncs can only be paused/resumed if they are active
        my $status = $SYNC->{$sync}{status};
        if ($status ne 'active') {
            print qq{Cannot pause or resume sync "$sync" unless it is active (currently "$status")\n};
        }
        else {
            $dbh->do(qq{NOTIFY "bucardo_${action}_sync_$sync"});
            push @syncs_signalled => $sync;
        }
    }

    $dbh->commit();

    my $list = join ',' => @syncs_signalled;
    $QUIET or print qq{Syncs ${action}d: $list\n};

    exit 0;

} ## end of pause_resume


sub show_why_sync_killed {

    ## If a kick results in a "KILLED!" try and show why
    ## Arguments: one
    ## 1. Sync object
    ## Returns: message string

    my $sync = shift;

    $SQL = q{
SELECT * FROM bucardo.syncrun
WHERE sync = ?
AND lastbad
ORDER BY started DESC LIMIT 1
};
    $sth = $dbh->prepare($SQL);
    $count = $sth->execute($sync);
    if ($count != 1) {
        $sth->finish();
        return '';
    }

    my $result = $sth->fetchall_arrayref({})->[0];
    my $whydie = $result->{status} || '';
    $whydie =~ s/\\n */\n    /g;
    $whydie =~ s/: ERROR:/:\n    ERROR:/;
    $whydie =~ s/ (at .+ line \d+\.)/\n      $1/g;
    $whydie =~ s/\t/<tab>/g;
    my $message = sprintf "  Started: %s\n  Ended: %s\n    %s",
        $result->{pid} || '?',
        $result->{started} || '?',
        $result->{ended} || '?',
        $whydie;

    return $message;

} ## end of show_why_sync_killed


sub status_all {

    ## Show status of all syncs in the database
    ## Arguments: none
    ## Returns: never, exits

    ## See if the MCP is running and what its PID is
    if (! -e $PIDFILE) {
        #print " (Bucardo does not appear to be currently running)\n";
    }
    else {
        my $fh;
        if (!open $fh, '<', $PIDFILE) {
            print "\nERROR: Could not open $PIDFILE: $!";
        }
        else {
            my $pid = <$fh>;
            chomp $pid;
            close $fh or warn qq{Could not close $PIDFILE: $!\n};
            if ($pid =~ /^\d+$/) {
                print "PID of Bucardo MCP: $pid";
            }
            else {
                print "\nERROR: $PIDFILE contained: $pid";
            }
        }
    }
    print "\n";

    if (! keys %$SYNC) {
        print "No syncs have been created yet.\n";
        exit 0;
    }

    my $orderby = $bcargs->{sort} || '1';
    if ($orderby !~ /^\+?\-?\d$/) {
        die "Invalid sort option, must be +- 1 through 9\n";
    }

    ## Set the status for each sync if possible
    my $max = set_sync_status();

    ## The titles
    my %title = (
        name     => ' Name',
        state    => ' State',
        lastgood => ' Last good',
        timegood => ' Time',
        dit      => ($max->{truncate} ?
                    $max->{conflicts} ? ' Last I/D/T/C' : ' Last I/D/T' :
                    $max->{conflicts} ? ' Last I/D/C' :' Last I/D'),
        lastbad  => ' Last bad',
        timebad  => ' Time',
    );

    ## Set the maximum as needed based on the titles
    for my $name (keys %title) {
        if (! exists $max->{$name}
                or length($title{$name}) > $max->{$name}) {
            $max->{$name} = length $title{$name};
        }
    }

    ## Account for our extra spacing by bumping everything up
    for my $var (values %$max) {
        $var += 2;
    }

    ## Print the column headers
    printf qq{%-*s %-*s %-*s %-*s %-*s %-*s %-*s\n},
        $max->{name},     $title{name},
        $max->{state},    $title{state},
        $max->{lastgood}, $title{lastgood},
        $max->{timegood}, $title{timegood},
        $max->{dit},      $title{dit},
        $max->{lastbad},  $title{lastbad},
        $max->{timebad},  $title{timebad};

    ## Print a fancy dividing line
    printf qq{%s+%s+%s+%s+%s+%s+%s\n},
        '=' x $max->{name},
        '=' x $max->{state},
        '=' x $max->{lastgood},
        '=' x $max->{timegood},
        '=' x $max->{dit},
        '=' x $max->{lastbad},
        '=' x $max->{timebad};

    ## If fancy sorting desired, call the list ourself to sort
    sub sortme {
        my $sortcol = $bcargs->{sort} || 1;

        +1 == $sortcol and return $a cmp $b;
        -1 == $sortcol and return $b cmp $a;

        my ($uno,$dos) = ($SYNC->{$a}, $SYNC->{$b});

        ## State
        +3 == $sortcol and return ($uno->{state} cmp $dos->{state} or $a cmp $b);
        -3 == $sortcol and return ($dos->{state} cmp $uno->{state} or $a cmp $b);

        ## Last good
        +5 == $sortcol and return ($uno->{lastgoodsecs} <=> $dos->{lastgoodsecs} or $a cmp $b);
        -5 == $sortcol and return ($dos->{lastgoodsecs} <=> $uno->{lastgoodsecs} or $a cmp $b);

        ## Good time
        +6 == $sortcol and return ($uno->{lastgoodtime} <=> $dos->{lastgoodtime} or $a cmp $b);
        -6 == $sortcol and return ($dos->{lastgoodtime} <=> $uno->{lastgoodtime} or $a cmp $b);

        if ($sortcol == 7 or $sortcol == -7) {
            my ($total1,$total2) = (0,0);
            while ($uno->{dit} =~ /(\d+)/go) {
                $total1 += $1;
            }
            while ($dos->{dit} =~ /(\d+)/go) {
                $total2 += $1;
            }

            7 == $sortcol and return ($total1 <=> $total2 or $a cmp $b);

            return ($total2 <=> $total1 or $a cmp $b);
        }

        ## Last bad
        +8 == $sortcol and return ($uno->{lastbadsecs} <=> $dos->{lastbadsecs} or $a cmp $b);
        -8 == $sortcol and return ($dos->{lastbadsecs} <=> $uno->{lastbadsecs} or $a cmp $b);

        ## Bad time
        +9 == $sortcol and return ($uno->{lastbadtime} <=> $dos->{lastbadtime} or $a cmp $b);
        -9 == $sortcol and return ($dos->{lastbadtime} <=> $uno->{lastbadtime} or $a cmp $b);


        return $a cmp $b;

    }

    for my $sync (sort sortme keys %$SYNC) {

        my $s = $SYNC->{$sync};

        ## If this has been filtered out, skip it entirely
        next if $s->{filtered};

        ## Populate any missing fields with an empty string
        for my $name (keys %title) {
            if (! exists $s->{$name}) {
                $s->{$name} = '';
            }
        }

        my $X = '|';
        printf qq{%-*s$X%-*s$X%-*s$X%-*s$X%-*s$X%-*s$X%-*s\n},
            $max->{name}," $sync ",
            $max->{state}, " $s->{state} ",
            $max->{lastgood}, " $s->{lastgood} ",
            $max->{timegood}, " $s->{timegood} ",
            $max->{dit}, " $s->{dit} ",
            $max->{lastbad}, " $s->{lastbad} ",
            $max->{timebad}, " $s->{timebad} ";
    }

    exit 0;

} ## end of status_all


sub status_detail {

    ## Show detailed information about one or more syncs
    ## Arguments: none, parses nouns
    ## Returns: never, exits

    ## Walk through and check each given sync
    ## It must either exist, or be a special key word

    my @synclist;
    for my $sync (@nouns) {

        ## Allow a special noise word: 'sync'
        next if $sync eq 'sync';

        ## Add everything if we find the special word 'all'
        if ($sync eq 'all') {
            undef @synclist;
            for my $sync (keys %$SYNC) {
                ## Turn off the filtering that set_sync_status may have added
                $SYNC->{$sync}{filtered} = 0;
                push @synclist => $sync;
            }
            last;
        }

        ## If we don't know about this particular sync, give a warning
        ## We allow another special word: 'all'
        if (!exists $SYNC->{$sync}) {
            ## If a number, skip for ease of "kick name #" toggling
            $sync !~ /^\d+$/ and die "No such sync: $sync\n";
        }
        else {
            push @synclist => $sync;
        }
    }


    ## Verify that all named syncs exist
    my $max = set_sync_status({syncs => \@synclist});

    ## Present each in the order they gave
    my $loops = 0;
    for my $sync (@synclist) {

        my $s = $SYNC->{$sync};

        ## Skip if it has been filtered out
        next if $s->{filtered};

        ## Put a space between multiple entries
        if ($loops++) {
            print "\n";
        }

        print '=' x 70; print "\n";

        my @items;
        my $numtables = keys %{$s->{herd}{goat}};

        my $sourcedb = $s->{herd}{db};

        ## Last good time, and number of rows affected
        if (exists $s->{rowgood}) {
            my $tt = pretty_time($s->{rowgood}{total_time});
            push @items => ['Last good', "$s->{rowgood}{started_time} (time to run: $tt)"];

            ## Space out the numbers
            $s->{dit} =~ s{/}{ / }g;
            ## Pretty comma formatting (based on ENV)
            $s->{dit} =~ s/(\d+)/pretty_number($1)/ge;

            ## Change the title if we have any truncates
            my $extra = $max->{truncates} ? '/truncates' : '';

            ## Change the title if we have any conflicts
            $extra .= $max->{conflicts} ? '/conflicts' : '';

            push @items => ["Rows deleted/inserted$extra", $s->{dit}];
        }

        ## Last bad time, and the exact error
        ## The error should always be last, so we defer adding it to the queue
        my $lasterror = '';
        if (exists $s->{rowbad}) {
            my $tt = pretty_time($s->{rowbad}{total_time});
            push @items => ['Last bad',  "$s->{rowbad}{started_time} (time until fail: $tt)"];

            ## Grab the error message, and strip out trailing whitespace
            ($lasterror = $s->{rowbad}{status}) =~ s/\s+$//;
            ## Add any newlines back in
            $lasterror =~ s/\\n/\n/g;
            ## Remove starting whitespace
            $lasterror =~ s/^\s+//;
        }

        ## Undefined should be written as 'none'
        for (qw/checktime/) {
            $s->{$_} ||= 'None';
        }

        ## Should be 'yes' or 'no'
        for (qw/analyze_after_copy vacuum_after_copy stayalive kidsalive autokick/) {
            $s->{$_} = (defined $s->{$_} and $s->{$_}) ? 'Yes' : 'No';
        }

        ## If currently running, there should be a PID file
        if (exists $s->{PIDFILE}) {
            push @items => ['PID file'         => $s->{PIDFILE}];
            push @items => ['PID file created' => $s->{CREATED}];
        }

        ## Build the display list
        push @items => ['Sync name'            => $sync];
        push @items => ['Current state'        => $s->{state}];
        push @items => ['Source relgroup/database' => "$s->{herd}{name} / $sourcedb"];
        push @items => ['Tables in sync'       => $numtables];
        push @items => ['Status'               => ucfirst $s->{status}];
        push @items => ['Check time'           => $s->{checktime}];
        push @items => ['Overdue time'         => $s->{overdue}];
        push @items => ['Expired time'         => $s->{expired}];
        push @items => ['Stayalive/Kidsalive'  => "$s->{stayalive} / $s->{kidsalive}"];
        push @items => ['Rebuild index'        => $s->{rebuild_index} ? 'Yes' : 'No'];
        push @items => ['Autokick'             => $s->{autokick}];
        push @items => ['Onetimecopy'          => $s->{onetimecopy} ? 'Yes' : 'No'];

        ## Only show these if enabled
        if ($s->{analyze_after_copy} eq 'Yes') {
            push @items => ['Post-copy analyze', 'Yes'];
        }
        if ($s->{vacuum_after_copy} eq 'Yes') {
            push @items => ['Post-copy vacuum', 'Yes'];
        }

        ## Final items:
        push @items => ['Last error:' => $lasterror];

        ## Figure out the maximum size of the left-hand items
        my $leftmax = 0;
        for (@items) {
            $leftmax = length $_->[0] if length $_->[0] > $leftmax;
        }

        ## Print it all out
        for (@items) {
            printf "%-*s : %s\n",
                $leftmax, $_->[0], $_->[1];
        }
        print '=' x 70; print "\n";


    }
    exit 0;

} ## end of status_detail




sub append_reason_file {

    ## Add an entry to the 'reason' log file
    ## Arguments: one
    ## 1. Message to store
    ## Returns: undef

    my $event = shift or die;

    my $string = sprintf "%s | %-5s | %s\n", (scalar localtime), $event, $nouns;

    open my $fh, '>', $REASONFILE or die qq{Could not open "$REASONFILE": $!\n};
    print {$fh} $string;
    close $fh or warn qq{Could not close $REASONFILE: $!\n};
    open $fh, '>>', $REASONFILE_LOG or die qq{Could not open "$REASONFILE_LOG": $!\n};
    print {$fh} $string;
    close $fh or warn qq{Could not close $REASONFILE_LOG: $!\n};

    return;

} ## end of append_reason_file




sub set_sync_status {

    ## Set detailed information about syncs from the syncrun table
    ## Arguments: zero or one (hashref)
    ## 1. Hashref containing a. syncs=arrarref of syncnames
    ## Returns: hashref indicating maximum lengths of inner information
    ## If a sync is filtered out via the 'syncs' argument, it is set to $s->{filtered} = 1

    my $arg = shift || {};

    ## View the details of the syncs via the syncrun table

    $SQL = qq{
SELECT *,
TO_CHAR(started,'$DATEFORMAT') AS started_time,
CASE WHEN current_date = ended::date
  THEN TO_CHAR(ended,'$SHORTDATEFORMAT')
  ELSE TO_CHAR(ended,'$DATEFORMAT') END AS ended_time,
ROUND(EXTRACT(epoch FROM ended)) AS ended_epoch,
EXTRACT(epoch FROM ended-started) AS total_time,
ROUND(EXTRACT(epoch FROM now()-started)) AS total_time_started,
ROUND(EXTRACT(epoch FROM now()-ended)) AS total_time_ended
FROM syncrun
WHERE sync = ?
AND (   lastgood  IS TRUE
     OR lastbad   IS TRUE
     OR lastempty IS TRUE
     OR ended IS NULL)
};
    $sth = $dbh->prepare($SQL);

    ## Find the maximum lengths of items so we can line things up pretty
    my %max = (
        name      => 1,
        state     => 1,
        dit       => 1,
        lastgood  => 1,
        timegood  => 1,
        lastbad   => 1,
        timebad   => 1,
    );

    for my $sync (keys %$SYNC) {

        my $s = $SYNC->{$sync};

        ## Sometimes we only want some of them
        if ($arg->{syncs}) {
            if (! grep { $_ eq $sync } @{$arg->{syncs}}) { ## no critic (ProhibitBooleanGrep)
                $s->{filtered} = 1;
                next;
            }
        }

        $max{name} = length($sync) if length($sync) > $max{name};

        $count = $sth->execute($sync);
        if ($count < 1) {
            $sth->finish;
            $s->{state} = 'No records found';
            $max{state} = length($s->{state}) if length($s->{state}) > $max{state};
            next;
        }
        for my $row (@{ $sth->fetchall_arrayref({}) }) {
            if ($row->{lastgood}) {
                $s->{rowgood} = $row;
            }
            elsif ($row->{lastempty}) {
                $s->{rowempty} = $row;
            }
            elsif ($row->{lastbad}) {
                $s->{rowbad} = $row;
            }
            else {
                $s->{runningrow} = $row;
            }
        }

        ## What is the state of this sync? First, is it still actively running?
        if (exists $s->{runningrow}) {
            $s->{state} = "$s->{runningrow}{status}";
        }
        else {
            ## What was the most recent run?
            my $highepoch = 0;
            undef $s->{latestrow};
            my $wintype;
            for my $type (qw/ bad good empty /) {
                my $r = $s->{"row$type"};
                next if ! defined $r;
                my $etime = $r->{ended_epoch};
                if ($etime >= $highepoch) {
                    $s->{latestrow} = $r;
                    $highepoch = $etime;
                    $wintype = $type;
                }
            }
            if (! defined $s->{latestrow}) {
                $s->{state} = 'Unknown';
                $max{state} = length($s->{state}) if length($s->{state}) > $max{state};
                next;
            }
            if ($wintype eq 'empty') {
                # Empty is good, as far as status is concerned.
                $s->{rowgood} = $s->{latestrow};
                $wintype = 'good';
            }
            $s->{state} = ucfirst $wintype;
        }

        ## deletes/inserts/truncates/conflicts
        $s->{dit} = '';
        if (exists $s->{rowgood}) {
            $s->{dit} = "$s->{rowgood}{deletes}/$s->{rowgood}{inserts}";
            if ($s->{rowgood}{truncates}) {
                $max{truncates} = 1;
                $s->{dit} .= "/$s->{rowgood}{truncates}";
            }
            if ($s->{rowgood}{conflicts}) {
                $max{conflicts} = 1;
                $s->{dit} .= "/$s->{rowgood}{conflicts}";
            }
        }
        $s->{lastgood} = exists $s->{rowgood} ? $s->{rowgood}{ended_time} : 'none';
        $s->{timegood} = exists $s->{rowgood} ? pretty_time($s->{rowgood}{total_time_ended}) : '';
        $s->{lastbad} = exists $s->{rowbad} ? $s->{rowbad}{ended_time} : 'none';
        $s->{timebad} = exists $s->{rowbad} ? pretty_time($s->{rowbad}{total_time_ended}) : '';

        for my $var (qw/ state dit lastgood timegood lastbad timebad /) {
            $max{$var} = length($s->{$var}) if length($s->{$var}) > $max{$var};
        }
    }

    return \%max;

} ## end of set_sync_status


sub inspect {

    ## Inspect an item in the database
    ## Arguments: none, parses nouns
    ## Returns: never, exits

    my $doc_section = 'inspect';
    usage_exit($doc_section) unless @nouns;
    my $thing = shift @nouns;

    inspect_table() if $thing =~ /tab/i  or $thing eq 't';
    inspect_sync()  if $thing =~ /sync/i or $thing eq 's';
    inspect_herd()  if $thing =~ /(?:relgr|herd)/i or $thing eq 'h';

    usage_exit($doc_section);

    return;

} ## end of inspect


sub inspect_table {

    ## Inspect an item from the goat table
    ## Arguments: none, parses nouns
    ## Returns: never, exits

    my $doc_section = 'inspect';
    usage_exit($doc_section) unless @nouns;

    $SQL = q{SELECT * FROM bucardo.goat WHERE tablename=?};
    my $sth_goat = $dbh->prepare($SQL);
    $SQL = q{SELECT * FROM bucardo.goat WHERE schemaname = ? AND tablename=?};
    my $sth_goat_schema = $dbh->prepare($SQL);
    my @tables;
    for my $name (@nouns) {
        my $sthg;
        if ($name =~ /(.+)\.(.+)/) {
            $sthg = $sth_goat_schema;
            $count = $sthg->execute($1,$2);
        }
        else {
            $sthg = $sth_goat;
            $count = $sthg->execute($name);
        }
        if ($count < 1) {
            die "Unknown table: $name\n";
        }

        for my $row (@{$sthg->fetchall_arrayref({})}) {
            push @tables, $row;
        }

    }

    for my $t (@tables) {
        my ($s,$t,$db,$id) = @$t{qw/schemaname tablename db id/};
        print "Inspecting $s.$t on $db\n";
        ## Grab all other tables referenced by this one
        my $tablist = get_reffed_tables($s,$t,$db);

        ## Check that each referenced table is in a herd with this table

        my %seenit;
        for my $tab (@$tablist) {
            my ($type,$tab1,$tab2,$name,$def) = @$tab;
            my $table = $type==1 ? $tab1 : $tab2;
            if ($table !~ /(.+)\.(.+)/) {
                die "Invalid table information\n";
            }
            my $schema = $1;
            $table = $2;
            next if $seenit{"$schema.$table.$type"}++;

            ## Make sure that each herd with this table also has this new table
            my $ggoat = $global{goat};
            my $hherd = $global{herd};
            for my $herd (sort keys %{$ggoat->{by_id}{$id}{herd}}) {
                $seenit{fktable} = 1;
                next if exists $hherd->{$herd}{hasgoat}{$schema}{$table};
                printf "Table %s.%s is in relgroup %s, but %s.%s (used as FK%s) is not\n",
                    $s, $t, $herd, $schema, $table,
                        $type == 1 ? '' : ' target';

            }
            if (! exists $seenit{fktable}) {
                printf "Table %s.%s is used as FK%s by %s.%s\n",
                    $s,$t,$type==1 ? '' : ' target', $schema, $table;
                delete $seenit{fktable};
            }
        }
    }

    exit 0;

} ## end of inspect_table


sub inspect_herd {

    ## Inspect an item from the herd table
    ## Arguments: none, parses nouns
    ## Returns: never, exits

    my $doc_section = 'inspect';
    usage_exit($doc_section) unless @nouns;

    die "Not implemented yet\n";

} ## end of inspect_herd


sub inspect_sync {

    ## Inspect an item from the sync table
    ## Arguments: none, parses nouns
    ## Returns: never, exits

    my $doc_section = 'inspect';
    usage_exit($doc_section) unless @nouns;

    die "Not implemented yet\n";

} ## end of inspect_sync


sub get_reffed_tables {

    ## Find all tables that are references by the given one
    ## Arguments: three
    ## 1. Schema name
    ## 2. Table name
    ## 3. Database name
    ## Returns: arrayref of tables from the database

    my ($s,$t,$db) = @_;

    my $rdbh = connect_database({name => $db});

    ## So we get the schemas
    $rdbh->do('SET search_path = pg_catalog');

    $SQL= q{
SELECT CASE WHEN conrelid=x.toid THEN 1 ELSE 2 END,
 confrelid::regclass,
 conrelid::regclass,
 conname,
 pg_get_constraintdef(oid, true)
FROM pg_constraint,
(SELECT c.oid AS toid FROM pg_class c JOIN pg_namespace n
   ON (n.oid=c.relnamespace) WHERE nspname=? AND relname=?
) x
WHERE contype = 'f' AND
(confrelid = x.toid OR conrelid = x.toid)
};

    $sth = $rdbh->prepare($SQL);
    $count = $sth->execute($s,$t);
    return $sth->fetchall_arrayref();

} ## end of get_reffed_tables




sub show_all_columns {

    ## Give a detailed listing of a particular row in the bucardo database
    ## Arguments: one
    ## 1. Hashref of information to display
    ## Returns: formatted, sorted, and indented list as a single string

    my $row = shift or die;

    my $maxkey = 1;
    for my $key (keys %$row) {
        next if ref $row->{$key};
        $maxkey = length $key if length $key > $maxkey;
    }
    for my $key (sort {
        ($a eq 'src_code' and $b ne 'src_code' ? 1 : 0)
        or
        ($a ne 'src_code' and $b eq 'src_code' ? -1 : 0)
        or
        $a cmp $b } keys %$row
     ) {
        next if ref $row->{$key};
        printf "    %-*s = %s\n", $maxkey, $key,
            defined $row->{$key} ? $row->{$key} : 'NULL';
    }

    return;

} ## end of show_all_columns


sub process_args {

    ## Break apart a string of args, return a clean hashref
    ## Arguments: one
    ## 1. List of arguments
    ## Returns: hashref

    my $string = shift or return {};
    $string .= ' ';

    my %arg;

    while ($string =~ m/(\w+)\s*[=:]\s*"(.+?)" /g) {
        $arg{lc $1} = $2;
    }
    $string =~ s/\w+\s*=\s*".+?" / /g;

    while ($string =~ m/(\w+)\s*[=:]\s*'(.+?)' /g) {
        $arg{lc $1} = $2;
    }
    $string =~ s/\w+\s*=\s*'.+?' / /g;

    while ($string =~ m/(\w+)\s*[=:]\s*(\S+)/g) {
        $arg{lc $1} = $2;
    }
    $string =~ s/\w+\s*=\s*\S+/ /g;

    if ($string =~ /\S/) {
        $string =~ s/^\s+//;
        $arg{extraargs} = [split /\s+/ => $string];
    }

    ## Clean up and standardize the names
    if (exists $arg{type}) {
        $arg{type} = standardize_rdbms_name($arg{type});
    }

    return \%arg;

} ## end of process_args


sub list_clones {

    ## Show information about clones. Queries the bucardo.clone table
    ## Arguments: zero or more
    ## 1+ Clone id to view.
    ## Returns: 0 on success, -1 on error
    ## Example: bucardo list clones

    ## Might be no clones yet
    if (! keys %$CLONE) {
        print "No clones have been created yet\n";
        return -1;
    }

    ## Keep track of specific requests
    my $cloneids;

    for my $term (@nouns) {

        if ($term =~ /^(\d+)$/) {
            my $id = $1;
            if (! exists $CLONE->{$id}) {
                die qq{No such clone id "$id": try bucardo list clones\n};
            }
            $cloneids->{$id}++;
        }

    } ## end each term

    ## Print them out in numeric order
    for my $clone (sort { $a->{id} <=> $b->{id} } values %$CLONE) {
        ## TODO: right justify numbers
        next if keys %$cloneids and ! exists $cloneids->{$clone->{id}};
        print "Clone #$clone->{id}";
        print " Status: $clone->{status}";
        defined $clone->{sync} and print "  Sync: $clone->{sync}";
        defined $clone->{dbgroup} and print " Dbgroup: $clone->{dbgroup}";
        defined $clone->{relgroup} and print "  Relgroup: $clone->{relgroup}";
        defined $clone->{started} and print "  Started: $clone->{pstarted}";
        defined $clone->{ended} and print "  Ended: $clone->{pstarted}";
        if (defined $clone->{options}) {
            print "  $clone->{options}";
        }
        ## Print last, on a new line:
        defined $clone->{summary} and print "\n  Summary: $clone->{summary}";
        print "\n";
    }

    return 0;

} ## end of list_clones


sub list_customcodes {

    ## Show information about all or some subset of the 'customcode' table
    ## Arguments: none, parses nouns for customcodes
    ## Returns: 0 on success, -1 on error

    my $doc_section = 'list';

    ## Any nouns are filters against the whole list
    my $clause = generate_clause({col => 'name', items => \@nouns});
    my $WHERE = $clause ? "WHERE $clause" : '';
    $SQL = "SELECT * FROM bucardo.customcode $WHERE ORDER BY name";
    $sth = $dbh->prepare($SQL);
    $count = $sth->execute();
    if ($count < 1) {
        $sth->finish();
        printf "There are no%s entries in the 'customcode' table.\n",
            $WHERE ? ' matching' : '';
        return -1;
    }

    $info = $sth->fetchall_arrayref({});

    my ($maxname,$maxwhen) = (1,1);
    for my $row (@$info) {
        $maxname = length $row->{name} if length $row->{name} > $maxname;
        $maxwhen = length $row->{whenrun} if length $row->{whenrun} > $maxwhen;
    }

    for my $row (@$info) {
        my $name = $row->{name};

        ## We never show the actual source code unless verbosity is at least three!
        if ($VERBOSE < 3) {
            $row->{src_code} = 'Use -vvv to see the actual source code';
        }

        ## We want to show all associates syncs and relations (when mapping is active)
        my $info2 = $CUSTOMCODE->{$name} || {};

        my ($synclist, $relationlist) = ('','');
        if (exists $info2->{map}) {
            $synclist = join ',' => sort map { $_->{sync} }
                grep { defined $_->{sync} and $_->{active} }
                    @{ $info2->{map} };
            $relationlist = join ',' => sort
                map { "$GOAT->{by_id}{$_->{goat}}{schemaname}.$GOAT->{by_id}{$_->{goat}}{tablename}" }
                grep { defined $_->{goat} and $_->{active} }
                    @{ $info2->{map} };
        }

        printf "Code: %-*s  When run: %-*s  Get dbh: %s  Status: %s\n",
            $maxname, $name,
            $maxwhen, $row->{whenrun},
            $row->{getdbh},
            $row->{status};
        if (length $synclist) {
            print "  Syncs: $synclist\n";
        }
        if (length $relationlist) {
            print "  Relations: $relationlist\n";
        }
        if (defined $row->{about} and $VERBOSE) {
            (my $about = $row->{about}) =~ s/(.)^/$1    /gsm;
            print "  About: $about\n";
        }
        $VERBOSE >= 2 and show_all_columns($row);
    }

    return 0;

} ## end of list_customcodes


sub update_customcode {

    ## Update one or more customcodes
    ## Arguments: none (reads nouns for a list of customcodes)
    ## Returns: never, exits

    my @actions = @_;

    my $doc_section = 'update/update customcode';
    usage_exit($doc_section) unless @actions;

    my $name = shift @actions;

    ## Recursively call ourselves for wildcards and 'all'
    exit 0 if ! check_recurse($SYNC, $name, @actions);

    ## Make sure this customcode exists!
    if (! exists $CUSTOMCODE->{$name}) {
        die qq{Could not find a customcode named "$name"\nUse 'list customcodes' to see all available.\n};
    }

    my $cc = $CUSTOMCODE->{$name};

    my $changes = 0;

    for my $action (@actions) {
        ## Look for a standard foo=bar or foo:bar format
        if ($action =~ /(.+?)\s*[=:]\s*(.+)/) {
            my ($setting,$value) = (lc $1,$2);

            ## No funny characters please, just boring column names
            $setting =~ /^[a-z_]+$/ or die "Invalid setting: $setting\n";

            my $srcfile;

            ## We only allow changing a strict subset of all the columns
            if ($setting =~ /^(?:about|getdbh|name|priority|status|whenrun|src_code)$/) {
                my $oldvalue = defined $cc->{$setting} ? $cc->{$setting} : '';
                ## Allow some variation for booleans, but transform to 0/1
                if ($setting =~ /^(?:getdbh)$/) {
                    $value = $value =~ /^[1tTyY]/ ? 1 : 0;
                }
                ## Some things can only be numbers
                elsif ($setting =~ /^(?:priority)$/) {
                    if ($value !~ /^\d+$/) {
                        die qq{Customcode setting "$setting" must be a number!\n};
                    }
                }
                ## And some are very specific indeed
                elsif ('whenrun' eq $setting) {
                    my %whenrun = map { $_ => 1 } _whenrun_values();
                    die qq{Invalid value for setting "whenrun"\n}
                        unless $whenrun{$value};
                }
                elsif ('src_code' eq $setting) {
                    $srcfile = $value;
                    if (! -e $srcfile) {
                        warn qq{Could not find a file named "$srcfile"\n};
                        exit 2;
                    }
                    open my $fh, '<', $srcfile or die qq{Could not open "$srcfile": $!\n};
                    $value = '';
                    { local $/; $value = <$fh>; } ## no critic (RequireInitializationForLocalVars)
                    close $fh or warn qq{Could not close "$srcfile": $!\n};
                }
                ## Make the change, if it has changed
                if ($value ne $oldvalue) {
                    $SQL = "UPDATE customcode SET $setting=? WHERE name = ?";
                    $sth = $dbh->prepare($SQL);
                    $sth->execute($value, $name);
                    $changes++;
                    if ('src_code' eq $setting) {
                        print qq{Changed customcode "$name" $setting with content of file "$srcfile"\n};
                    }
                    else {
                        print qq{Changed customcode "$name" $setting from '$oldvalue' to '$value'\n};
                    }
                }
            }
            else {
                warn "Cannot change attribute '$setting'\n";
                usage_exit($doc_section);
            }

            next;
        }

        warn "\nUnknown action: $action\n";
        usage_exit($doc_section);
    }

    confirm_commit() if $changes;

    return;

} ## end of update_customcode

sub _whenrun_values {
    return qw(
        before_txn
        before_check_rows
        before_trigger_drop
        after_trigger_drop
        after_table_sync
        exception
        conflict
        before_trigger_enable
        after_trigger_enable
        after_txn
        before_sync
        after_sync
    );
}



sub list_sequences {

    ## Show information about all or some sequences in the 'goat' table
    ## Arguments: none (reads nouns for a list of sequences)
    ## Returns: 0 on success, -1 on error

    my $doc_section = 'list';

    my $clause = generate_clause({col => 'tablename', items => \@nouns});
    my $WHERE = $clause ? "AND $clause" : '';
    $SQL = "SELECT * FROM bucardo.goat WHERE reltype = 'sequence' $WHERE ORDER BY schemaname, tablename";
    $sth = $dbh->prepare($SQL);
    $count = $sth->execute();
    if ($count < 1) {
        $sth->finish();
        printf "There are no%s sequences.\n",
            $WHERE ? ' matching' : '';
        return -1;
    }

    $info = $sth->fetchall_arrayref({});
    my $maxq = 1;
    for my $row (@$info) {
        my $len = length "$row->{schemaname}.$row->{tablename}";
        $maxq = $len if $len > $maxq;
    }

    for my $row (@$info) {
        printf "Sequence: %-*s  DB: %s\n",
            $maxq, "$row->{schemaname}.$row->{tablename}",
              $row->{db};
        $VERBOSE >= 2 and show_all_columns($row);
    }


    return 0;

} ## end of list_sequences


sub pretty_time {

    ## Change seconds to a prettier display with hours, minutes, etc.
    ## Arguments: one
    ## 1. Number of seconds
    ## Returns: formatted string

    my $secs = shift;

    ## Round up to the nearest second if decimal places are given
    $secs = ceil($secs);

    ## If we cannot figure out the seconds, give up and return a question mark
    return '?' if ! defined $secs or $secs !~ /^\-?\d+$/o or $secs < 0;

    ## Initialize days, hours, minutes, and seconds
    my ($D,$H,$M,$S) = (0,0,0,0);

    ## Some people do not want days shown, so leave it as an option
    if ($bcargs->{showdays}) {
        if ($secs > 60*60*24) {
            $D = int $secs/(60*60*24);
            $secs -= $D*60*60*24;
        }
    }

    ## Show hours if there is > 1 hour
    if ($secs > 60*60) {
        $H = int $secs/(60*60);
        $secs -= $H*60*60;
    }

    ## Show minutes if there is > 1 minute
    if ($secs > 60) {
        $M = int $secs/60;
        $secs -= $M*60;
    }
    $secs = int $secs;
    my $answer = sprintf "%s%s%s${secs}s",$D ? "${D}d " : '',$H ? "${H}h " : '',$M ? "${M}m " : '';

    ## Detailed listings get compressed
    if ((defined $COMPRESS and $COMPRESS) or (!defined $COMPRESS and !@nouns)) {
        $answer =~ s/ //g;
    }

    return $answer;

} ## end of pretty_time


sub pretty_number {

    ## Format a raw number in a more readable style
    ## Arguments: one
    ## 1. Number
    ## Returns: formatted number

    my $number = shift;

    return $number if $number !~ /^\d+$/ or $number < 1000;

    ## If this is our first time here, find the correct separator
    if (! defined $bcargs->{tsep}) {
        my $lconv = localeconv();
        $bcargs->{tsep} = $lconv->{thousands_sep} || ',';
    }

    ## No formatting at all
    return $number if '' eq $bcargs->{tsep} or ! $bcargs->{tsep};

    (my $reverse = reverse $number) =~ s/(...)(?=\d)/$1$bcargs->{tsep}/g;
    $number = reverse $reverse;
    return $number;

} ## end of pretty_number



sub vate_sync {

    ## Activate or deactivate a sync
    ## Arguments: none (reads verbs and nouns)
    ## Returns: never, exits

    my $name = lc $verb;
    my $ucname = ucfirst $name;
    @nouns or die qq{${name}_sync requires at least one sync name\n};

    my $wait = (defined $adverb and $adverb eq '0') ? 1 : 0;
    for my $sync (@syncs) {
        (my $vname = $ucname) =~ s/e$/ing/;
        $QUIET or print qq{$vname sync $sync};
        my $done = "bucardo_${name}d_sync_$sync";
        $dbh->do(qq{NOTIFY "bucardo_${name}_sync_$sync"});
        if ($wait) {
            print '...';
            $dbh->do(qq{LISTEN "$done"});
        }
        $dbh->commit();
        if (!$wait) {
            print "\n";
            next;
        }
        sleep 0.1;
        wait_for_notice($dbh, $done);
        print "OK\n";
    } ## end each sync

    exit 0;

} ## end of vate_sync




















sub add_customcode {

    ## Add an entry to the bucardo.customcode table
    ## Arguments: none (uses nouns)
    ## Returns: never, exits

    my $item_name = shift @nouns || '';

    my $doc_section = 'add/add customcode';
    usage_exit($doc_section) unless length $item_name;

    ## Inputs and aliases, database column name, flags, default
    my $whenrun = join '|' => _whenrun_values();
    my $validcols = qq{
        name                     name                 0                $item_name
        about                    about                0                null
        whenrun|when_run         whenrun              =$whenrun        null
        getdbh                   getdbh               TF               null
        sync                     sync                 0                skip
        goat|table|relation      goat                 0                skip
        status                   status               =active|inactive skip
        priority                 priority             number           skip
        src_code                 src_code             0                skip
    };

    my ( $dbcols, $cols, $phs, $vals, $extras ) = process_simple_args({
        cols        => $validcols,
        list        => \@nouns,
        doc_section => $doc_section,
    });

    my $newname = $dbcols->{name};

    ## Does this already exist?
    if (exists $CUSTOMCODE->{$newname}) {
        warn qq{Cannot create: customcode "$newname" already exists\n};
        exit 2;
    }

    ## We must have a "whenrun"
    usage_exit($doc_section) unless $dbcols->{whenrun};

    ## We must have a src_code as a file
    usage_exit($doc_section) unless $extras->{src_code};

    my $tfile = $extras->{src_code};
    if (! -e $tfile) {
        warn qq{Could not find a file named "$tfile"\n};
        exit 2;
    }
    open my $fh, '<', $tfile or die qq{Could not open "$tfile": $!\n};
    my $src = '';
    { local $/; $src = <$fh>; } ## no critic (RequireInitializationForLocalVars)
    close $fh or warn qq{Could not close "$tfile": $!\n};

    ## Attempt to insert this into the database
    $SQL = "INSERT INTO bucardo.customcode ($cols,src_code) VALUES ($phs,?)";
    $DEBUG and warn "SQL: $SQL\n";
    $DEBUG and warn Dumper $vals;
    $sth = $dbh->prepare($SQL);
    eval {
        $count = $sth->execute((map { $vals->{$_} } sort keys %$vals), $src);
    };
    if ($@) {
        die "Failed to add customcode: $@\n";
    }

    my $finalmsg = '';

    ## See if any updates to customcode_map need to be made

    ## Only one of sync or goat can be specified
    if ($extras->{sync} and $extras->{relation}) {
        die qq{Sorry, you must specify a sync OR a relation, not both\n};
    }

    ## Makes no sense to specify priority or active if no goat or sync
    if (($extras->{priority} or $extras->{active}) and !$extras->{sync} and ! $extras->{relation}) {
        die qq{You must specify a sync or a relation when using priority or active\n};
    }

    ## Is this a valid sync?
    if ($extras->{sync} and ! exists $SYNC->{$extras->{sync}}) {
        die qq{Unknown sync: $extras->{sync}\n};
    }

    ## Is this a valid gaot?
    if ($extras->{relation} and ! exists $GOAT->{by_name}{$extras->{relation}}
        and ! exists $GOAT->{by_table}{$extras->{relation}}) {
        die qq{Unknown relation: $extras->{relation}\n};
    }

    ## Add to the customcode_map table
    if ($extras->{sync} or $extras->{relation}) {
        $SQL = 'INSERT INTO customcode_map(code,';
        my @vals;
        for my $col (qw/sync priority active/) {
            if ($extras->{$col}) {
                $SQL .= "$col,";
                push @vals => $extras->{$col};
            }
        }
        if ($extras->{relation}) {
            $SQL .= 'goat,';
            push @vals => exists $GOAT->{by_name}{$extras->{relation}}
                ? $GOAT->{by_name}{$extras->{relation}}->[0]{id}
                    : $GOAT->{by_table}{$extras->{relation}}->[0]{id};
        }
        my $phs2 = '?,' x @vals;
        $SQL .= ") VALUES ((SELECT currval('customcode_id_seq')),$phs2)";
        $SQL =~ s/,\)/)/g;
        $sth = $dbh->prepare($SQL);
        eval {
            $count = $sth->execute(@vals);
        };
        if ($@) {
            die "Failed to add customcode_map: $@\n";
        }
    }

    if (!$QUIET) {
        print qq{Added customcode "$newname"\n};
        $finalmsg and print $finalmsg;
    }

    confirm_commit();

    exit 0;

} ## end of add_customcode
















sub _list_databases {

    ## Quick list of available databases
    ## Arguments: none
    ## Returns: list of databases as a single string

    return if ! keys %{ $DB };
    warn "The following databases are available:\n";
    for (sort keys %{ $DB }) {
        next if $DB->{$_}{dbtype} ne 'postgres';
        print "$_\n";
    }
    return;

} ## end of _list_databases


sub add_all_tables {

    ## Add all tables, returns output from add_all_goats
    ## Arguments: none
    ## Returns: output of inner sub

    return add_all_goats('table');

} ## end of add_all_tables


sub add_all_sequences {

    ## Add all tables, returns output from add_all_goats
    ## Arguments: none
    ## Returns: output of inner sub

    return add_all_goats('sequence');

} ## end of add_all_sequences


sub add_all_goats {

    ## Add all tables, or sequences
    ## Arguments: one
    ## 1. The type, table or sequence
    ## Returns: Srting indicating what was done

    my $type = shift;

    ## Usage: add all table(s) | add all sequence(s)
    ## Options:
    ## --db: use this database (internal name from the db table)
    ## --schema or -n: limit to one or more comma-separated schemas
    ## --exclude-schema or -N: exclude these schemas
    ## --table or -t: limit to the given tables
    ## --exclude-table or -T: exclude these tables
    ## --relgroup: name of the herd to add new tables to
    ## pkonly: exclude tables with no pkey
    ## Returns: text string of results, with a newline

    ## Transform command-line args to traditional format
    ## e.g. db=foo becomes the equivalent of --db=foo
    ## foo becomes foo=1
    for my $noun (@nouns) {
        if ($noun =~ /(\w+)=(\w+)/) {
            $bcargs->{$1} = $2;
        }
        else {
            $bcargs->{$noun} = 1;
        }
    }

    $bcargs->{herd} = delete $bcargs->{relgroup} || $bcargs->{herd};

    ## If no databases, cowardly refuse to continue
    if (! keys %$DB) {
        die "Sorry, cannot add any ${type}s until at least one database has been added\n";
    }

    ## If there is more than one database, it should be selected via db=
    my $db;
    my $showdbs = 0;
    if (exists $bcargs->{db}) {
        if (! exists $DB->{$bcargs->{db}}) {
            warn qq{Sorry, could not find a database named "$bcargs->{db}"\n};
            $showdbs = 1;
        }
        else {
            $db = $DB->{$bcargs->{db}};
        }
    }
    elsif (keys %$DB == 1) {
        ($db) = values %$DB;
    }
    else {
        ## Grab the most likely candidate
        my $bestdb = find_best_db_for_searching();
        if (! $bestdb) {
            warn "Please specify which database to use with the db=<name> option\n";
            $showdbs = 1;
        }
        else {
            $db = $DB->{$bestdb};
        }
    }

    if ($showdbs) {
        _list_databases();
        exit 1;
    }

    ## Connect to the remote database
    my $dbh2 = connect_database({name => $db->{name}});

    ## Query to pull all tables we may possibly need
    my $kind = $type eq 'table' ? 'r' : 'S';
    $SQL = q{SELECT nspname, relname FROM pg_catalog.pg_class c }
        . q{JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) }
        . qq{WHERE relkind = '$kind' };

    ## We always exclude information_schema, system, and bucardo schemas
    $SQL .= q{AND n.nspname <> 'information_schema' AND nspname !~ '^pg' AND nspname !~ '^bucardo'};

    my @clause;

    ## If they gave a schema option, restrict the query by namespace
    push @clause => generate_clause({col => 'nspname', items => $bcargs->{schema}});

    ## If they have asked to exclude schemas, append that to the namespace clause
    push @clause => generate_clause({col => 'nspname', items => $bcargs->{'exclude-schema'}, not => 1});

    ## If they gave a table option, restrict the query by relname
    push @clause => generate_clause({col => 'relname', items => $bcargs->{table}});

    ## If they have asked to exclude tables, append that to the relname clause
    push @clause => generate_clause({col => 'relname', items => $bcargs->{'exclude-table'}, not => 1});

    for my $c (@clause) {
        next if ! $c;
        $SQL .= "\nAND ($c)";
    }

    ## Fetch all the items, warn if no matches are found
    $VERBOSE >= 2 and warn "Query: $SQL\n";
    $sth = $dbh2->prepare($SQL);
    $count = $sth->execute();
    if ($count < 1) {
        warn "Sorry, no ${type}s were found\n";
    }

    ## Grab all current tables or sequences from the goat table.
    $SQL = qq{SELECT schemaname, tablename FROM bucardo.goat WHERE reltype= '$type' AND db = '$db->{name}'};
    my %hastable;
    for my $row (@{$dbh->selectall_arrayref($SQL)}) {
        $hastable{$row->[0]}{$row->[1]}++;
    }

    ## Do we have a herd request? Process it if so
    my $herd = '';
    my $addtoherd;
    if ($bcargs->{herd}) {
        $herd = $bcargs->{herd};
        $SQL = 'SELECT 1 FROM bucardo.herd WHERE name = ?';
        my $herdcheck = $dbh->prepare($SQL);
        $count = $herdcheck->execute($herd);
        $herdcheck->finish();
        if ($count < 1) {
            print "Creating relgroup: $herd\n";
            $SQL = 'INSERT INTO bucardo.herd(name) VALUES (?)';
            $herdcheck = $dbh->prepare($SQL);
            $herdcheck->execute($herd);
        }
        else {
            $VERBOSE >= 1 and warn "Relgroup already exists: $herd\n";
        }
        $SQL = 'INSERT INTO bucardo.herdmap(herd,goat) VALUES (?,?)';
        $addtoherd = $dbh->prepare($SQL);
    }

    ## Get ready to add tables or sequences to the goat table
    $SQL = q{INSERT INTO bucardo.goat (db,schemaname,tablename,reltype};
    $SQL .= exists $bcargs->{makedelta} ? ',makedelta) VALUES (?,?,?,?,?)' : ') VALUES (?,?,?,?)';
    my $addtable = $dbh->prepare($SQL);

    ## Walk through all returned tables from the remote database
    my %count = (seenit => 0, added => 0);
    my (%old, %new, %fail, $id);
    for my $row (@{$sth->fetchall_arrayref()}) {
        my ($S,$T) = @$row;
        my $tinfo;
        ## Do we already have this one?
        if (exists $hastable{$S}{$T}) {
            $VERBOSE >= 2 and warn "Skipping $type already in relation: $S.$T\n";
            $count{seenit}++;
            $old{$S}{$T} = 1;
            if ($herd) {
                ## In case this is not already in the herd, grab the id and jump down
                $SQL = 'SELECT * FROM goat WHERE db=? AND schemaname=? AND tablename=? AND reltype=?';
                $sth = $dbh->prepare($SQL);
                $count = $sth->execute($db->{name},$S,$T,$type);
                if ($count < 1) {
                    die qq{Could not find $type $S.$T in database "$db->{name}"!\n};
                }
                $tinfo = $sth->fetchall_arrayref({})->[0];
                $id = $tinfo->{id};
                goto HERD;
            }
            next;
        }

        $VERBOSE >= 2 and warn "Attempting to add relation $S.$T\n";
        ## We want a savepoint as we may retract the addition (e.g. no pkey and pkonly specified)
        $dbh->do('SAVEPOINT newtable');
        eval {
            my @arg = ($db->{name},$S,$T,$type);
            push @arg => $bcargs->{makedelta} if exists $bcargs->{makedelta};
            $count = $addtable->execute(@arg);
        };
        if ($@) {
            warn "$@\n";
            if ($@ =~ /prepared statement.+already exists/) {
                warn "This message usually indicates you are using pgbouncer\n";
                warn "You can probably fix this problem by running:\n";
                warn "$progname update db $db->{name} server_side_prepares=false\n";
                warn "Then retry your command again\n\n";
            }
            exit 1;
        }
        if ($count != 1) {
            $addtable->finish();
            warn "Failed to add $type relation $S.$T!\n";
            $fail{$S}{$T} = 1;
            next;
        }
        $SQL = q{SELECT currval('bucardo.goat_id_seq')};
        $id = $dbh->selectall_arrayref($SQL)->[0][0];
        $VERBOSE >= 2 and warn "ID of new table $S.$T is $id\n";

        ## Grab it back from the database
        $SQL = 'SELECT * FROM goat WHERE id = ?';
        $sth = $dbh->prepare($SQL);
        $sth->execute($id);
        $tinfo = $sth->fetchall_arrayref({})->[0];

        ## If it has no primary key and pkonly is set, abandon this change
        if ($bcargs->{pkonly} and 'table' eq $type and ! length $tinfo->{pkey}) {
            $VERBOSE >= 1 and warn "Not adding table $S.$T: no pkey\n";
            $dbh->do('ROLLBACK TO newtable');
            next;
        }

        $count{added}++;
        $new{$S}{$T} = 1;
      HERD:
        if ($herd) {
            ## Need to check again as the previous check above was only for brand new tables
            if ($bcargs->{pkonly} and 'table' eq $type and ! length $tinfo->{pkey}) {
                $VERBOSE >= 1 and warn "Not adding table $S.$T to relgroup: no pkey\n";
            }
            else {
                $SQL = 'SELECT 1 FROM herdmap WHERE herd=? AND goat = ?';
                $sth = $dbh->prepare($SQL);
                $count = $sth->execute($herd, $id);
                if ($count < 1) {
                    $addtoherd->execute($herd, $id);
                    print "Added $type $S.$T to relgroup $herd\n";
                }
            }
        }

    }

    ## Disconnect from the remote database
    $dbh2->disconnect();

    if ($VERBOSE >= 1) {
        if (%new) {
            print "New ${type}s:\n";
            for my $s (sort keys %new) {
                for my $t (sort keys %{$new{$s}}) {
                    print "  $s.$t\n";
                }
            }
        }
        if (%fail) {
            print "Failed to add ${type}s:\n";
            for my $s (sort keys %fail) {
                for my $t (sort keys %{$fail{$s}}) {
                    print "  $s.$t\n";
                }
            }
        }
    }

    my $message = "New ${type}s added: $count{added}\n";
    if ($count{seenit}) {
        $message .= "Already added: $count{seenit}\n";
    }

    return $message;

} ## end of add_all_goats




sub remove_customcode {

    ## Usage: remove customcode name [name2 name3 ...]
    ## Arguments: none (uses nouns)
    ## Returns: never, exits

    my $doc_section = 'remove';
    usage_exit($doc_section) unless @nouns;

    ## Make sure all named codes exist
    my $code = $global{cc};
    for my $name (@nouns) {
        if (! exists $code->{$name}) {
            die qq{No such code: $name\n};
        }
    }

    $SQL = 'DELETE FROM bucardo.customcode WHERE name = ?';
    $sth = $dbh->prepare($SQL);

    for my $name (@nouns) {
        eval {
            $sth->execute($name);
        };
        if ($@) {
            die qq{Could not delete customcode "$name"\n$@\n};
        }
    }

    for my $name (@nouns) {
        print qq{Removed customcode "$name"\n};
    }

    $dbh->commit();

    exit 0;


} ## end of remove_customcode











sub clog {

    ## Output a message to stderr
    ## Arguments: one
    ## 1. Message
    ## Returns: undef

    my $message = shift;
    chomp $message;

    warn "$message\n";

    return;

} ## end of clog


sub schema_exists {

    ## Determine if a named schema exists
    ## Arguments: one
    ## 1. Schema name
    ## Returns: 0 or 1

    my $schema = shift;

    my $SQL = 'SELECT 1 FROM pg_catalog.pg_namespace WHERE nspname = ?';
    my $sth = $dbh->prepare_cached($SQL);
    my $count = $sth->execute($schema);
    $sth->finish();

    return $count < 1 ? 0 : 1;

} ## end of schema_exists


sub relation_exists {

    ## Determine if a named relation exists
    ## Arguments: two
    ## 1. Schema name
    ## 2. Relation name
    ## Returns: OID of the relation, or 0 if it does not exist

    my ($schema,$name) = @_;

    my $SQL = 'SELECT c.oid FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n '.
        'WHERE n.oid=c.relnamespace AND n.nspname = ? AND c.relname = ?';
    my $sth = $dbh->prepare_cached($SQL);
    my $count = $sth->execute($schema,$name);
    if ($count == 1) {
        return $sth->fetchall_arrayref()->[0][0];
    }
    $sth->finish();

    return 0;

} ## end of relation_exists


sub domain_exists {

    ## Determine if a named domain exists
    ## Arguments: two
    ## 1. Schema name
    ## 2. Domain name
    ## Returns: 0 or 1

    my ($schema,$name) = @_;

    my $SQL =
          q{SELECT 1 FROM pg_catalog.pg_type t }
        . q{JOIN pg_namespace n ON (n.oid = t.typnamespace) }
        . q{WHERE t.typtype = 'd' AND n.nspname = ? AND t.typname = ?};
    my $sth = $dbh->prepare_cached($SQL);
    $count = $sth->execute($schema,$name);
    $sth->finish();

    return $count < 1 ? 0 : 1;

} ## end of domain_exists


sub config_exists {

    ## Checks if a configuration settings exists
    ## Arguments: one
    ## 1. Name of the setting
    ## Returns: 0 or 1

    my $name = shift;

    my $SQL = 'SELECT 1 FROM bucardo.bucardo_config WHERE name = ?';
    my $sth = $dbh->prepare_cached($SQL);
    my $count = $sth->execute($name);
    $sth->finish();

    return $count < 1 ? 0 : 1;

} ## end of config_exists


sub constraint_exists {

    ## Determine if a named constraint exists
    ## Arguments: three
    ## 1. Schema name
    ## 2. Table name
    ## 3. Constraint name
    ## Returns: 0 or 1

    my ($schema,$table,$constraint) = @_;

    my $SQL = 'SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_constraint o '.
        'WHERE n.oid=c.relnamespace AND c.oid=o.conrelid AND n.nspname = ? AND c.relname = ? AND o.conname = ?';
    my $sth = $dbh->prepare_cached($SQL);
    my $count = $sth->execute($schema,$table,$constraint);
    $sth->finish();

    return $count < 1 ? 0 : 1;

} ## end of constraint_exists


sub column_exists {

    ## Determine if a named column exists
    ## Arguments: three
    ## 1. Schema name
    ## 2. Table name
    ## 3. Column name
    ## Returns: 0 or 1

    my ($schema,$table,$column) = @_;

    my $SQL = 'SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, '.
        'pg_catalog.pg_attribute a WHERE n.oid=c.relnamespace AND n.nspname = ? AND c.relname = ? '.
        'AND a.attname = ? AND a.attrelid = c.oid';
    my $sth = $dbh->prepare_cached($SQL);
    my $count = $sth->execute($schema,$table,$column);
    $sth->finish();

    return $count < 1 ? 0 : 1;

} ## end of column_exists


sub trigger_exists {

    ## Determine if a named trigger exists
    ## Arguments: one
    ## 1. Trigger name
    ## Returns: 0 or 1

    my $name = shift;
    my $SQL = 'SELECT 1 FROM pg_catalog.pg_trigger WHERE tgname = ?';
    my $sth = $dbh->prepare_cached($SQL);
    my $count = $sth->execute($name);
    $sth->finish();
    return $count < 1 ? 0 : 1;

} ## end of trigger_exists


sub function_exists {

    ## Determine if a named function exists
    ## Arguments: three
    ## 1. Schema name
    ## 2. Function name
    ## 3. Function arguments (as one CSV string)
    ## Returns: MD5 of the function source if found, otherwise an empty string

    my ($schema,$name,$args) = @_;

    $name = lc $name;
    $SQL = 'SELECT md5(prosrc) FROM pg_proc p, pg_language l '.
        'WHERE p.prolang = l.oid AND proname = ? AND oidvectortypes(proargtypes) = ?';
    $sth = $dbh->prepare($SQL);
    $count = $sth->execute($name,$args);
    if ($count < 1) {
        $sth->finish();
        return '';
    }

    return $sth->fetchall_arrayref()->[0][0];

} ## end of function_exists


sub column_default {

    ## Return the default value for a column in a table
    ## Arguments: three
    ## 1. Schema name
    ## 2. Table name
    ## 3. Column name
    ## Returns: default value if available, otherwise an empty string

    my ($schema,$table,$column) = @_;
    my $SQL = 'SELECT pg_get_expr(adbin,adrelid) FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, '.
        'pg_catalog.pg_attribute a, pg_attrdef d '.
        'WHERE n.oid=c.relnamespace AND n.nspname = ? AND c.relname = ? '.
        'AND a.attname = ? AND a.attrelid = c.oid AND d.adnum = a.attnum AND d.adrelid = a.attrelid';
    my $sth = $dbh->prepare_cached($SQL);
    my $count = $sth->execute($schema,$table,$column);
    if ($count < 1) {
        $sth->finish();
        return '';
    }
    return $sth->fetchall_arrayref()->[0][0];

} ## end of column_default


sub column_value {

    ## Return the value of a table's column
    ## Arguments: four
    ## 1. Schema name
    ## 2. Table name
    ## 3. Column name
    ## 4. Where clause
    ## Returns: value if available, otherwise an empty string

    my ($schema,$table,$column,$where) = @_;

    my $SQL = "SELECT $column FROM $schema.$table WHERE $where";
    return $dbh->selectall_arrayref($SQL)->[0][0];

} ## end of column_value


sub column_type {

    ## Return the data type of a table column
    ## Arguments: three
    ## 1. Schema name
    ## 2. Table name
    ## 3. Column name
    ## Returns: data type if available, otherwise an empty string

    my ($schema,$table,$column) = @_;
    my $SQL = 'SELECT  pg_catalog.format_type(a.atttypid, a.atttypmod) '.
        'FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, '.
        'pg_catalog.pg_attribute a '.
        'WHERE n.oid=c.relnamespace AND n.nspname = ? AND c.relname = ? '.
        'AND a.attname = ? AND a.attrelid = c.oid';
    my $sth = $dbh->prepare_cached($SQL);
    my $count = $sth->execute($schema,$table,$column);
    if ($count eq '0E0') {
        $sth->finish();
        return '';
    }
    return $sth->fetchall_arrayref()->[0][0];

} ## end of column_type


sub constraint_definition {

    ## Return the definition for a constraint
    ## Arguments: one
    ## 1. Constraint name
    ## Returns: definition if found, otherwise an empty string

    my $name = shift;

    my $SQL = qq{SELECT pg_get_constraintdef(oid,true) FROM pg_constraint WHERE conname = '$name'};
    my $def = $dbh->selectall_arrayref($SQL)->[0][0];

    ## Nothing found? Just return an empty string
    return '' if ! defined $def;

    ## Do some cleanups to standardize across versions and match bucardo.schema cleanly
    $def =~ s/\((\(.+\))\)/$1/;
    $def =~ s/= ANY \(ARRAY\[(.+)\]\)/IN ($1)/;
    $def =~ s/<> ALL \(ARRAY\[(.+)\]\)/NOT IN ($1)/;
    $def =~ s/::text//g;
    $def =~ s/(\w+) ~ '/$1 ~ E'/g;
    $def =~ s/CHECK \(\((\w+)\) <>/CHECK ($1 <>/;

    return $def;

} ## end of constraint_definition


sub table_comment {

    ## Return the comment of a table
    ## Arguments: two
    ## 1. Schema name
    ## 2. Table name
    ## Returns: comment if available, otherwise an empty string

    my ($schema,$relation) = @_;

    my $SQL = q{SELECT description FROM pg_description WHERE objoid = (}
        . q{ SELECT c.oid FROM pg_class c JOIN pg_namespace n ON (n.oid = c.relnamespace)}
        . q{ WHERE n.nspname = ? AND c.relname = ?)};

    my $sth = $dbh->prepare($SQL);
    $count = $sth->execute($schema,$relation);
    if ($count < 1) {
        $sth->finish();
        return '';
    }
    return $sth->fetchall_arrayref()->[0][0];

} ## end of table_comment


sub domain_comment {

    ## Return the comment of a domain
    ## Arguments: two
    ## 1. Schema name
    ## 2. Domain name
    ## Returns: comment if available, otherwise an empty string

    my ($schema,$relation) = @_;

    my $SQL = q{SELECT description FROM pg_description WHERE objoid = (}
        . q{ SELECT t.oid FROM pg_type t JOIN pg_namespace n ON (n.oid = t.typnamespace)}
        . q{ WHERE t.typtype = 'd' AND n.nspname = ? AND t.typname = ?)};

    my $sth = $dbh->prepare($SQL);
    $count = $sth->execute($schema,$relation);
    if ($count < 1) {
        $sth->finish();
        return '';
    }
    return $sth->fetchall_arrayref()->[0][0];

} ## end of domain_comment


sub find_bucardo_schema {

    ## Locate the best bucardo.schema file and return a file handle and name for it
    ## Arguments: none
    ## Returns: file handle and location of the file

    my $fh;

    ## Start by checking the current directory
    my $schema_file = 'bucardo.schema';
    return ($fh, $schema_file) if open $fh, '<', $schema_file;

    ## Check for a symlink path back to the right directory
    if (-l $progname) {
        my $dir = dirname( readlink $progname );
        $schema_file = File::Spec->catfile( $dir, 'bucardo.schema' );
        return ($fh, $schema_file) if open $fh, '<', $schema_file;
    }

    ## Try /usr/local/share/bucardo
    $schema_file = '/usr/local/share/bucardo/bucardo.schema';
    return ($fh, $schema_file) if open $fh, '<', $schema_file;

    ## Try /usr/share/bucardo
    $schema_file = '/usr/share/bucardo/bucardo.schema';
    return ($fh, $schema_file) if open $fh, '<', $schema_file;

    die "Could not find the bucardo.schema file!\n";

} ## end of find_bucardo_schema


sub table_definition {

    ## Pull the complete table definition from the bucardo.schema file
    ## Returns an arrayref of sequences, and the textual table def
    ## Arguments: one
    ## 1. Name of the table
    ## Returns: arrayref of sequences used, table definition

    my $name = shift;

    my $def = '';

    my ($fh, $schema_file) = find_bucardo_schema();
    my @seq;
    while (<$fh>) {
        if (!$def) {
            if (/^CREATE TABLE $name/) {
                $def .= $_;
            }
        }
        else {
            $def .= $_;
            last if /^\);/;
        }
    }
    close $fh or die qq{Could not close "$schema_file": $!\n};
    while ($def =~ /nextval\('(.+?)'/g) {
        push @seq => $1;
    }

    if (! length($def)) {
        die "Could not find the table definition for $name\n";
    }

    return \@seq, $def;

} ## end of table_definition


sub generate_clause {

    ## Generate a snippet of SQL for a WHERE clause
    ## Arguments: one
    ## 1. Hashref of information
    ## Returns: new clause

    my $arg = shift or die;
    return '' if ! $arg->{items} or ! defined $arg->{items}[0];

    my $col = $arg->{col} or die;
    my $items = $arg->{items};
    my ($NOT,$NOTR) = ('','');
    if (exists $arg->{not}) {
        $NOT = 'NOT ';
        $NOTR = '!';
    }
    my $andor = exists $arg->{andor} ? uc($arg->{andor}) : $NOT ? 'AND' : 'OR';

    my (@oneitem,@itemlist);
    for my $name (@{$items}) {
        $name =~ s/^\s*(.+?)\s*$/$1/;
        ## Break into schema and relation
        my $schema = '';
        if ($col eq 'tablename' and $name =~ s/(.+\w)\.(\w.+)/$2/) {
            $schema = $1;
        }

        my $one = 1;
        ## Contains:
        if ($name =~ s/^\*(.+)\*$/$1/) {
            push @oneitem => "$col ${NOTR}~ " . qquote($1);
        }
        ## Starts with:
        elsif ($name =~ s/^\*(.+)/$1/) {
            push @oneitem => "$col ${NOTR}~ " . qquote("$1\$");
        }
        ## Ends with:
        elsif ($name =~ s/(.+)\*$/$1/) {
            push @oneitem => "$col ${NOTR}~ " . qquote("^$1");
        }
        else {
            push @itemlist => qquote($name);
            $one = 0;
        }
        if ($schema) {
            my $col2 = 'schemaname';
            my $old = $one ? pop @oneitem : pop @itemlist;
            if ($schema =~ s/^\*(.+)\*$/$1/) {
                push @oneitem => "($old AND $col2 ${NOTR}~ " . qquote($1) . ')';
            }
            elsif ($schema =~ s/^\*(.+)/$1/) {
                push @oneitem => "($old AND $col2 ${NOTR}~ " . qquote("$1\$") . ')';
            }
            elsif ($schema =~ s/(.+)\*$/$1/) {
                push @oneitem => "($old AND $col2 ${NOTR}~ " . qquote("^$1") . ')';
            }
            else {
                push @oneitem => "($col = $old AND $col2 = " . qquote($schema) . ')';
            }
        }
    }
    if (@itemlist) {
        my $list = sprintf '%s %s%s (%s)', $col, $NOT, 'IN', (join ',' => @itemlist);
        push @oneitem => $list;
    }
    my $SQL = join " $andor " => @oneitem;

    return $SQL;

} ## end of generate_clause


sub qquote {

    ## Quick SQL quoting
    ## Arguments: one
    ## 1. String to be quoted
    ## Returns: modified string

    my $thing = shift;

    $thing =~ s/'/''/g;

    return qq{'$thing'};

} ## end of qquote


sub upgrade {

    ## Make upgrades to an existing Bucardo schema to match the current version
    ## Arguments: none
    ## Returns: never, exits

    ## Ensure the bucardo.schema file is available and the correct version
    my ($fh, $schema_file) = find_bucardo_schema();

    my $schema_version = 0;
    while (<$fh>) {
        if (/\-\- Version (\d+\.\d+\.\d+)/) {
            $schema_version = $1;
            last;
        }
    }
    if (! $schema_version) {
        die qq{Could not find version number in the file "$schema_file"!\n};
    }
    if ($schema_version ne $VERSION) {
        die qq{Cannot continue: bucardo is version $VERSION, but $schema_file is version $schema_version\n};
    }

    $dbh->do(q{SET escape_string_warning = 'OFF'});
    if ($dbh->{pg_server_version} >= 80200) {
        $dbh->do(q{SET standard_conforming_strings = 'ON'});
    }

    my $changes = 0;

    ## Quick sanity to make sure we don't try to cross the 4/5 boundary
    if (!relation_exists('bucardo', 'syncrun')) {
      print "Sorry, but Bucardo version 4 cannot be upgraded to version 5\n";
      print "You will have to recreate your information (dbs, syncs, etc.)\n";
      exit 1;
    }

    ## Make sure the upgrade_log table is in place

    if (!relation_exists('bucardo', 'upgrade_log')) {
        my ($seqlist, $tabledef) = table_definition('bucardo.upgrade_log');
        upgrade_and_log($tabledef,'CREATE TABLE bucardo.upgrade_log');
        $dbh->commit();
    }

    my @old_sequences = (
        'dbgroup_id_seq',
    );

    my @old_configs = (
        'pidfile',
        'upsert_attempts',
    );

    my @renamed_configs = (
        ['default_standard_conflict' => 'default_conflict_strategy'],
    );

    my @old_constraints = (
        ['bucardo', 'goat', 'goat_pkeytype_check'],
        ['bucardo', 'sync', 'sync_replica_allornone'],
        ['bucardo', 'sync', 'sync_disable_triggers_method'],
        ['bucardo', 'sync', 'sync_disable_rules_method'],
    );

    my @old_columns = (
        ['bucardo', 'dbmap', 'makedelta'],
        ['bucardo', 'sync',  'disable_rules'],
        ['bucardo', 'sync',  'disable_triggers'],
        ['bucardo', 'sync',  'makedelta'],
    );

    my @old_functions = (
        ['create_child_q', 'text'],
    );

    my @old_indexes = (
        ['bucardo', 'sync', 'sync_source_targetdb'],
        ['bucardo', 'sync', 'sync_source_targetgroup'],
    );

    my @old_views = (
        'goats_in_herd',
    );

    my @new_columns = (
    );

    my @dropped_columns = (
        ['bucardo', 'sync', 'limitdbs'],
        ['bucardo', 'goat', 'customselect'],
        ['bucardo', 'sync', 'usecustomselect'],
        ['bucardo', 'sync', 'do_listen'],
        ['bucardo', 'customcode', 'getrows'],
    );

    my @altered_columns = (
        ['bucardo', 'goat', 'rebuild_index',     'BOOL2SMALLINT1'],
        ['bucardo', 'goat', 'schemaname',        'NO DEFAULT'],
        ['bucardo', 'sync', 'isolation_level',   'NO DEFAULT'],
        ['bucardo', 'sync', 'rebuild_index',     'BOOL2SMALLINT1'],
        ['bucardo', 'sync', 'standard_conflict', 'RENAME conflict_strategy'],
        ['bucardo', 'sync', 'ping',              'RENAME autokick'],
        ['bucardo', 'goat', 'ping',              'RENAME autokick'],
        ['bucardo', 'goat', 'standard_conflict', 'RENAME conflict_strategy'],
    );

    my @row_values = (

        ['bucardo_config','about',q{name = 'log_showtime'}, 1,
         'Show timestamp in the log output?  0=off  1=seconds since epoch  2=scalar gmtime  3=scalar localtime'],
        ['bucardo_config', 'about', q{name = 'default_conflict_strategy'}, 1, 'Default conflict strategy for all syncs'],
    );

    my @drop_all_rules = (
    );

    ## Drop all existing rules from a table:
    for my $row (@drop_all_rules) {
        my ($schema,$table) = @$row;
        my $oid = relation_exists($schema,$table);
        if (!$oid) {
            warn "Could not find table $schema.$table to check!\n";
            next;
        }
        $SQL = 'SELECT rulename FROM pg_catalog.pg_rewrite WHERE ev_class = ? ORDER BY rulename';
        $sth = $dbh->prepare($SQL);
        $count = $sth->execute($oid);
        if ($count < 1) {
            $sth->finish();
            next;
        }
        for my $rule (map { $_->[0] } @{$sth->fetchall_arrayref()}) {
            upgrade_and_log(qq{DROP RULE "$rule" ON $schema.$table});
            clog "Dropped rule $rule on table $schema.$table";
            $changes++;
        }
    }

    ## Drop any old views
    for my $name (@old_views) {
        next if !relation_exists('bucardo', $name);
        upgrade_and_log("DROP VIEW $name");
        clog "Dropped view $name";
        $changes++;
    }

    ## Drop any old sequences
    for my $sequence (@old_sequences) {
        next if !relation_exists('bucardo', $sequence);
        upgrade_and_log("DROP SEQUENCE bucardo.$sequence");
        clog "Dropped sequence: $sequence";
        $changes++;
    }

    ## Drop any old constraints
    for my $con (@old_constraints) {
        my ($schema, $table, $constraint) = @$con;
        next if !constraint_exists($schema, $table, $constraint);
        upgrade_and_log(qq{ALTER TABLE $schema.$table DROP CONSTRAINT "$constraint"});
        clog "Dropped constraint $constraint ON $schema.$table";
        $changes++;
    }

    ## Parse the bucardo.schema file and verify the following types of objects exist:
    ## Functions, triggers, constraints, sequences, indexes, comments, and domains
    my (@flist, @tlist, @ilist, @clist, @clist2, @slist, @tablelist, @comlist, @domlist, @collist);
    my ($fname,$args,$fbody) = ('','','');
    my ($tname,$tbody) = ('','');
    my ($tablename,$tablebody) = ('','');
    my ($altername,$alterbody,$alterstat) = ('','','');
    seek $fh, 0, 0;
    while (<$fh>) {
        if ($fbody) {
            if (/^(\$bc\$;)/) {
                $fbody .= $1;
                push @flist, [$fname, $args, $fbody];
                $fbody = $fname = $args = '';
            }
            else {
                $fbody .= $_;
            }
            next;
        }
        if ($tbody) {
            $tbody .= $_;
            if (/;/) {
                push @tlist, [$tname, $tbody];
                $tbody = $tname = '';
            }
            next;
        }
        if ($tablebody) {
            $tablebody .= $_;
            if (/^\s*CONSTRAINT\s+(\w+)\s+(.+?)\s*$/) {
                my ($cname,$def) = ($1,$2);
                $def =~ s/,$//;
                $def =~ s/\bbucardo\.//;
                push @clist2, [$tablename, $cname, $def];
            }
            elsif (/^\s+([a-z_]+)\s+([A-Z]+)\s*(NOT)? NULL(.*)/) {
                my ($colname,$coltype,$isnull,$extra,$default) = ($1, $2, $3 ? 1 : 0, $4, undef);
                if ($extra =~ /DEFAULT\s+([^,]+)/) {
                    $default = $1;
                }
                push @collist, ['bucardo', $tablename, $colname, $_, $default];
            }
            elsif (/;/) {
                push @tablelist, [$tablename, $tablebody];
                $tablebody = $tablename = '';
            }
            else {
                die qq{Could not parse table definition: invalid column at line $. ($_)\n};
            }
            next;
        }
        if ($altername) {
            $alterbody =~ s/\s+$//;
            $alterbody ? s/^\s+/ / : s/^\s+//;
            s/\s+$/ /;
            $alterbody .= $_;
            $alterstat .= $_;
            if ($alterbody =~ s/;\s*$//) {
                push @clist, [$altername->[0], $altername->[1], $alterbody, $alterstat];
                $alterbody = $altername = $alterstat = '';
            }
            next;
        }
        if (/^CREATE (?:OR REPLACE )?FUNCTION\s+bucardo\.(.+?\))/) {
            $fname = $1;
            $fbody .= $_;
            $fname =~ s/\((.*)\)// or die "No args found for function: $_\n";
            $args = $1;
            $args =~ s/,(\S)/, $1/g;
            next;
        }
        if (/^CREATE TRIGGER (\S+)/) {
            $tname = $1;
            $tbody .= $_;
            next;
        }
        if (/^CREATE TABLE bucardo\.(\w+)/) {
            $tablename = $1;
            $tablebody .= $_;
            next;
        }
        if (/^CREATE (UNIQUE )?INDEX (\S+)/) {
            push @ilist, [$1, $2, $_];
            next;
        }
        if (/^ALTER TABLE bucardo\.(\S+)\s+ADD CONSTRAINT\s*(\S+)\s*(\S*.*)/) {
            $altername = [$1,$2];
            $alterbody = $3 || '';
            $alterstat = $_;
            next;
        }
        if (/^CREATE SEQUENCE bucardo\.(\w+)/) {
            push @slist, [$1, $_];
            next;
        }
        if (/^COMMENT ON (\w+) (\w+)\.(\w+) IS \$\$(.+)\$\$/) {
            push @comlist, [lc $1, $2, $3, $4, $_];
            next;
        }
        if (/^CREATE DOMAIN bucardo\.(\w+) (.+)/) {
            push @domlist, [$1, $2];
            next;
        }
    }

    ## Add any new domains, verify existing ones
    for my $row (@domlist) {
        my ($name,$def) = @$row;
        next if domain_exists('bucardo', $name);
        upgrade_and_log("CREATE DOMAIN bucardo.$name $def");
        clog("Created domain: $name");
        $changes++;
    }

    ## Check for any added sequences
    for my $row (@slist) {
        my ($sname,$body) = @$row;
        next if relation_exists('bucardo', $sname);
        upgrade_and_log($body);
        clog "Created sequence $sname";
        $changes++;
    }

    ## Check for any added tables
    for my $row (@tablelist) {
        my ($name,$body) = @$row;
        next if relation_exists('bucardo', $name);
        upgrade_and_log($body);
        clog "Created table $name";
        $changes++;
    }

    ## Add new columns as needed from the schema
    for my $row (@collist) {
        my ($schema,$table,$column,$definition) = @$row;
        next if column_exists($schema, $table, $column);
        $definition =~ s/\-\-.+$//;
        $definition =~ s/,\s*$//;
        $definition =~ s/\s+/ /g;
        upgrade_and_log("ALTER TABLE $schema.$table ADD COLUMN $definition");
        clog "Created column: $schema.$table.$column";
        $changes++;
    }

    ## Add specific new columns as needed
    for my $row (@new_columns) {
        my ($schema,$table,$column,$def) = @$row;
        next if column_exists($schema, $table, $column);
        $def =~ s/\s+/ /g;
        upgrade_and_log("ALTER TABLE $schema.$table ADD COLUMN $def");
        clog "Created column: $schema.$table.$column";
        $changes++;
    }

    ## Drop columns as needed.
    for my $row (@dropped_columns) {
        my ($schema,$table,$column) = @$row;
        next unless column_exists($schema, $table, $column);
        upgrade_and_log("ALTER TABLE $schema.$table DROP COLUMN $column");
        clog "Dropped column: $schema.$table.$column";
        $changes++;
    }

    ## Change any altered columns
    for my $row (@altered_columns) {
        my ($schema,$table,$column,$change) = @$row;
        next if ! column_exists($schema, $table, $column);
        if ($change eq 'NO DEFAULT') {
            my $def = column_default($schema, $table, $column);
            next if !$def;
            upgrade_and_log("ALTER TABLE $schema.$table ALTER COLUMN $column DROP DEFAULT");
            clog "Removed DEFAULT ($def) from $schema.$table.$column";
            $changes++;
        }
        elsif ($change =~ /^RENAME\s+(\w+)/) {
            my $newname = $1;
            next if column_exists($schema, $table, $newname);
            upgrade_and_log("ALTER TABLE $schema.$table RENAME COLUMN $column TO $newname");
            clog("Renamed $schema.$table.$column to $newname");
            $changes++;
        }
        elsif ($change =~ /^DEFAULT\s+(.+)/) {
            my $newname = $1;
            my $oldname = column_default($schema, $table, $column);
            next if $newname eq $oldname;
            upgrade_and_log("ALTER TABLE $schema.$table ALTER COLUMN $column SET DEFAULT $newname");
            clog("Changed DEFAULT on $schema.$table.$column to $newname");
            $changes++;
        }
        elsif ($change =~ /BOOL2SMALLINT(\d)/) {
            my $defval = $1;
            my $oldtype = column_type($schema, $table, $column);
            next if $oldtype eq 'smallint';
            upgrade_and_log("ALTER TABLE $schema.$table ALTER COLUMN $column DROP DEFAULT");
            upgrade_and_log("ALTER TABLE $schema.$table ALTER COLUMN $column TYPE smallint "
                            . "USING CASE WHEN $column IS NULL OR $column IS FALSE THEN 0 ELSE $defval END");
            upgrade_and_log("ALTER TABLE $schema.$table ALTER COLUMN $column SET DEFAULT 0");
            clog("Changed type of $schema.$table.$column to smallint");
            $changes++;
        }
        else {
            die qq{Do not know how to handle altered column spec of "$change"};
        }
    }

    ## Change any column defaults
    ## Add new columns as needed from the schema
    for my $row (@collist) {
        my ($schema,$table,$column,$definition,$default) = @$row;
        next if ! column_exists($schema, $table, $column) or ! defined $default;
        my $olddefault = column_default($schema, $table, $column);
        $olddefault =~ s/::text//;
        $olddefault =~ s/::regclass//;
        $olddefault =~ s/'00:00:00'::interval/'0 seconds'::interval/;
        next if $olddefault eq $default;
        upgrade_and_log("ALTER TABLE $schema.$table ALTER COLUMN $column SET DEFAULT $default");
        clog "Set new default for $schema.$table.$column: $default";
        $changes++;
    }


    ## Drop any old columns
    for my $row (@old_columns) {
        my ($schema,$table,$column) = @$row;
        next if !column_exists($schema, $table, $column);
        upgrade_and_log("ALTER TABLE $schema.$table DROP COLUMN $column");
        clog "Dropped column: $schema.$table.$column";
        $changes++;
    }

    ## Drop any old indexes
    for my $row (@old_indexes) {
        my ($schema,$table,$name) = @$row;
        next if !relation_exists($schema, $name);
        upgrade_and_log("DROP INDEX $name");
        clog "Dropped index $name";
        $changes++;
    }

    ## Drop any old functions
    for my $row (@old_functions) {
        my ($name, $largs) = @$row;
        next if ! function_exists('bucardo', $name, $largs);
        clog "Dropped function $name($largs)";
        upgrade_and_log(qq{DROP FUNCTION bucardo."$name"($largs)});
        $changes++;
    }

    ## Drop any old config items
    for my $name (@old_configs) {
        next if ! config_exists($name);
        clog "Removed old bucardo_config name: $name";
        upgrade_and_log(qq{DELETE FROM bucardo.bucardo_config WHERE name = '$name'});
        $changes++;
    }

    ## Rename configs.
    for my $names (@renamed_configs) {
        next if config_exists($names->[1]);
        clog "Renamed bucardo_config $names->[0] to $names->[1]";
        upgrade_and_log(qq{
            UPDATE bucardo.bucardo_config
               SET name = '$names->[1]'
             WHERE name = '$names->[0]'
        });
        $changes++;
    }

    ## Special case config renaming
    if (config_exists('bucardo_current_version')) {
        ## was version and current_version; became initial_version and version
        clog('Renaming bucardo_current_version to bucardo_version, and bucardo_version to bucardo_initial_version');
        upgrade_and_log(q{UPDATE bucardo.bucardo_config SET name = 'bucardo_initial_version' WHERE name = 'bucardo_version'});
        upgrade_and_log(q{UPDATE bucardo.bucardo_config SET name = 'bucardo_version' WHERE name = 'bucardo_current_version'});
    }

    ## Check for any new config items
    $SQL = 'SELECT setting FROM bucardo.bucardo_config WHERE lower(name) = ?';
    my $cfgsth = $dbh->prepare($SQL);
    $SQL = 'INSERT INTO bucardo.bucardo_config(name,setting,about) VALUES (?,?,?)';
    my $newcfg = $dbh->prepare($SQL);
    my %config;
    my $inside = 0;
    seek $fh, 0, 0;
    while (<$fh>) {
        chomp;
        if (!$inside) {
            if (/^WITH DELIMITER/) {
                $inside = 1;
            }
            next;
        }
        if (/^\\/) {
            $inside = 0;
            next;
        }
        ## Scoop
        my ($name,$setting,$about) = split /\|/ => $_;
        $config{$name} = [$setting,$about];
        $count = $cfgsth->execute($name);
        $cfgsth->finish();
        if ($count eq '0E0') {
            clog "Added new bucardo_config name: $name";
            $changes++;
            $newcfg->execute($name,$setting,$about);
        }
    }
    close $fh or die qq{Could not close file "$file": $!\n};

    ## Apply any specific row changes
    for my $row (@row_values) {
        my ($table,$column,$where,$force,$value) = @$row;
        my $val = column_value('bucardo',$table,$column,$where);
        if (!defined $val) {
            die "Failed to find $table.$column where $where!\n";
        }
        next if $val eq $value;
        $SQL = sprintf "UPDATE bucardo.$table SET $column=%s WHERE $where",
            $dbh->quote($value);
        upgrade_and_log($SQL);
        clog "New value set for bucardo.$table.$column WHERE $where";
        $changes++;
    }

    $SQL = 'SELECT pg_catalog.md5(?)';
    my $md5sth = $dbh->prepare($SQL);
    for my $row (@flist) {
        my ($name,$arg,$body) = @$row;
        next if $name =~ /plperlu_test/;
        my $oldbody = function_exists('bucardo',$name,$arg);
        if (!$oldbody) {
            upgrade_and_log($body,"CREATE FUNCTION $name($arg)");
            clog "Added function $name($arg)";
            $changes++;
            next;
        }
        my $realbody = $body;
        $realbody =~ s/.*?\$bc\$(.+)\$bc\$;/$1/sm;
        $md5sth->execute($realbody);
        my $newbody = $md5sth->fetchall_arrayref()->[0][0];
        next if $oldbody eq $newbody;
        $body =~ s/^CREATE FUNCTION/CREATE OR REPLACE FUNCTION/;
        (my $short = $body) =~ s/^(.+?)\n.*/$1/s;
        $dbh->do('SAVEPOINT bucardo_upgrade');
        eval { upgrade_and_log($body,$short); };
        if ($@) {
            $dbh->do('ROLLBACK TO bucardo_upgrade');
            (my $dropbody = $short) =~ s/CREATE OR REPLACE/DROP/;
            $dropbody .= ' CASCADE';
            upgrade_and_log($dropbody);
            upgrade_and_log($body,$short);
        }
        else {
            $dbh->do('RELEASE bucardo_upgrade');
        }
        clog "Updated function: $name($arg)";
        $changes++;
    }

    ## Check for any added triggers
    for my $row (@tlist) {
        my ($name,$body) = @$row;
        next if trigger_exists($name);
        upgrade_and_log($body);
        clog "Created trigger $name";
        $changes++;
    }

    ## Check for any added indexes
    for my $row (@ilist) {
        my ($uniq,$name,$body) = @$row;
        next if relation_exists('bucardo',$name);
        upgrade_and_log($body);
        clog "Created index $name";
        $changes++;
    }

    ## Check for any added constraints
    for my $row (@clist) {
        my ($tcname,$cname,$cdef,$body) = @$row;
        if (! constraint_exists('bucardo', $tcname, $cname)) {
            upgrade_and_log($body);
            clog "Created constraint $cname on $tcname";
            $changes++;
            next;
        }

        ## Clean up the constraint to make it match what comes back from the database:
        $cdef =~ s/','/', '/g;
        my $condef = constraint_definition($cname);
        $condef =~ s{\\}{\\\\}g;
        if ($condef ne $cdef) {
            upgrade_and_log("ALTER TABLE $tcname DROP CONSTRAINT $cname");
            upgrade_and_log("ALTER TABLE $tcname ADD CONSTRAINT $cname $cdef");
            clog "Altered constraint $cname on $tcname";
            clog "OLD: $condef\nNEW: $cdef\n";
            $changes++;
        }
    }

    ## Check that any bare constraints (e.g. foreign keys) are unchanged
    for my $row (@clist2) {
        my ($tcname,$cname,$cdef) = @$row;
        my $condef = constraint_definition($cname);
        next if ! $condef or $condef eq $cdef;
        if ($condef and $condef ne $cdef) {
            upgrade_and_log("ALTER TABLE $tcname DROP CONSTRAINT $cname");
        }
        upgrade_and_log("ALTER TABLE $tcname ADD CONSTRAINT $cname $cdef");
        my $action = $condef ? 'Altered' : 'Added';
        clog "$action constraint $cname on $tcname";
        $changes++;
    }

    ## Check that object comments exist and match
    for my $row (@comlist) {
        my ($type,$schema,$relation,$comment,$full) = @$row;
        my $current_comment =
            $type eq 'table' ? table_comment($schema,$relation)
            : $type eq 'domain' ? domain_comment($schema,$relation)
            : 'Unkonwn type';
        if ($current_comment ne $comment) {
            upgrade_and_log($full);
            clog (length $current_comment
                ? "Changed comment on $type $schema.$relation"
                : "Added comment for $type $schema.$relation");
            $changes++;
        }
    }

    ## The freezer.q_staging table is no longer needed, but we must empty it before dropping
    if (relation_exists('freezer','q_staging')) {
        upgrade_and_log('INSERT INTO freezer.master_q SELECT * FROM freezer.q_staging');
        upgrade_and_log('DROP TABLE freezer.q_staging');
        clog 'Dropped deprecated table freezer.q_staging';
        $changes++;
    }

    ## Make sure bucardo_config has the new schema version
    $count = $cfgsth->execute('bucardo_version');
    if ($count eq '0E0') {
        $cfgsth->finish();
        warn "Weird: could not find bucardo_version in the bucardo_config table!\n";
    }
    else {
        my $curval = $cfgsth->fetchall_arrayref()->[0][0];
        if ($curval ne $schema_version) {
            $SQL = 'UPDATE bucardo.bucardo_config SET setting = ? WHERE name = ?';
            my $updatecfg = $dbh->prepare($SQL);
            $updatecfg->execute($schema_version, 'bucardo_version');
            clog "Set bucardo_config.bucardo_version to $schema_version";
            $changes++;
        }
    }

    ## Run the magic updater
    $SQL = 'SELECT bucardo.magic_update()';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    my $message = $sth->fetchall_arrayref()->[0][0];
    if (length $message) {
        clog $message;
        $changes++;
    }

    if ($changes) {
        printf "Okay to commit $changes %s? ", $changes==1 ? 'change' : 'changes';
        exit if <STDIN> !~ /Y/i;
        $dbh->commit();
        print "Changes have been commited\n";
    }
    else {
        print "No schema changes were needed\n";
        exit 1;
    }

    print "Don't forget to run '$progname validate all' as well: see the UPGRADE file for details\n";

    exit 0;

} ## end of upgrade


sub upgrade_and_log {

    ## Put an entry in the bucardo.upgrade_log table
    ## Arguments: two
    ## 1. Type of action
    ## 2. Optional message
    ## Returns: undef

    my $action = shift;
    my $short = shift || $action;

    eval {
        $dbh->do($action);
    };
    if ($@) {
        my $line = (caller)[2];
        die "From line $line, action $action\n$@\n";
    }

    $SQL = 'INSERT INTO bucardo.upgrade_log(action,version,summary) VALUES (?,?,?)';
    eval {
        $sth = $dbh->prepare($SQL);
        $sth->execute($action,$VERSION,$short);
    };
    if ($@) {
        my $line = (caller)[2];
        die "From line $line, insert to upgrade_log failed\n$@\n";
    }

    return;

} ## end of upgrade_and_log


sub usage_exit {

    ## Grab the help string for a specific item
    ## Arguments: one
    ## 1. The thing we want help on
    ## Returns: nothing

    my $name = shift or die;
    my $exitval = defined $_[0] ? shift : 1;

    if ($name =~ m{/!}) {
        # Bug in Pod::Usage prevents these from working properly. Force it
        # to use Pod::PlainText.
        # https://rt.perl.org/rt3//Public/Bug/Display.html?id=115534
        require Pod::Usage;
        require Pod::PlainText;
        unshift @Pod::Usage::ISA => 'Pod::PlainText';
    }

    _pod2usage(
        '-sections' => "COMMAND DETAILS/$name",
        '-exitval'  => $exitval,
    );

    return;

} ## end of usage_exit


sub connect_database {

    ## Connect to a datbase and return a dbh
    ## Arguments: one
    ## 1. Hashref of connection arguments (optional)
    ## Returns: database handle

    my $dbh2;

    my $opt = shift || {};

    ## If given just a name, transform to a hash
    if (! ref $opt) {
        $opt = { name => $opt };
    }

    if (! exists $DB->{$opt->{name}}) {
        die qq{Unknown database "$opt->{name}": try bucardo list dbs\n};
    }

    if (exists $opt->{name}) {
        $SQL = qq{SELECT bucardo.db_getconn('$opt->{name}')};
        my $conn = $dbh->selectall_arrayref($SQL)->[0][0];
        my ($type,$dsn,$user,$pass) = split /\n/ => $conn;

        if ($type ne 'postgres') {
            die "Cannot return a handle for database type $type\n";
        }

        eval {
            $dbh2 = DBI->connect_cached($dsn, $user, $pass, {AutoCommit=>0,RaiseError=>1,PrintError=>0});
        };
        if ($@) {
            ## The bucardo user may not exist yet.
            if ($user eq 'bucardo' and $@ =~ /FATAL/ and $@ =~ /bucardo/) {
                $user = 'postgres';
                $dbh2 = DBI->connect_cached($dsn, $user, $pass, {AutoCommit=>0,RaiseError=>1,PrintError=>0});
                $dbh2->do('CREATE USER bucardo SUPERUSER');
                $dbh2->commit();
                $user = 'bucardo';
                $dbh2 = DBI->connect_cached($dsn, $user, $pass, {AutoCommit=>0,RaiseError=>1,PrintError=>0});
            }
            else {
                die $@;
            }
        }
    }

    return $dbh2;

} ## end of connect_database


sub config {

    ## View or change a value inside the bucardo_config table
    ## Arguments: none, reads nouns
    ## Returns: never, exits

    my $setusage = "Usage: $progname set setting=value [setting=value ...]\n";

    ## Allow for old syntax
    if ($verb eq 'config') {
        ## Plain old "config" means the same as "show all"
        if (!@nouns) {
            @nouns = ('show','all');
        }
        $verb = shift @nouns;
    }

    if (!@nouns) {
        $verb eq 'set' and die $setusage;
        die "Usage: $progname show <all|setting1> [settting2 ...]\n";
    }

    $SQL = 'SELECT * FROM bucardo.bucardo_config';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    my $config = $sth->fetchall_hashref('name');
    if ($verb eq 'show') {
        my $all = $nouns[0] =~ /\ball\b/i ? 1 : 0;
        my $maxsize = 3;
        for my $s (keys %$config) {
            next if ! $all and ! grep { $s =~ /$_/i } @nouns;
            $maxsize = length $s if length $s > $maxsize;
        }
        for my $s (sort keys %$config) {
            next if ! $all and ! grep { $s =~ /$_/i } @nouns;
            printf "%-*s = %s\n", $maxsize, $s, $config->{$s}{setting};
        }
        exit 1;
    }

    $SQL = 'UPDATE bucardo.bucardo_config SET setting = ? WHERE name = ?';
    $sth = $dbh->prepare($SQL);

    for my $noun (@nouns) {
        $noun =~ /(\w+)=(.+)/ or die $setusage;
        my ($setting,$val) = (lc $1,$2);

        if (! exists $config->{$setting}) {
            die qq{Unknown setting "$setting"\n};
        }

        ## Sanity checks
        if ($setting eq 'log_level') {
            if ($val !~ /^(?:terse|normal|verbose|debug)$/oi) {
                die "Invalid log_level, must be terse, normal, verbose, or debug\n";
            }
        }
        if ($setting eq 'default_standard_conflict' || $setting eq 'default_conflict_strategy') {
            if ($val !~ /^(?:source|target|skip|random|latest|none)$/oi) {
                ## FIXME
                #die "Invalid default_standard_conflict, must be none, source, target, skip, random, or latest\n";
            }
            if ($val =~ /none/i) {
                $val = '';
            }
            $setting = 'default_conflict_strategy';
        }

        $sth->execute($val,$setting);
        $QUIET or print qq{Set "$setting" to "$val"\n};

    }

    $dbh->commit();

    exit 0;

} ## end of config


sub message {

    ## Add a message to the Bucardo logs, via the bucardo_log_message table
    ## Note: If no MCP processes are listening, the message will hang out until an MCP processes it
    ## Arguments: none (reads in nouns)
    ## Returns: never, exits

    my $doc_section = 'message';
    usage_exit($doc_section) unless length $nouns;

    $SQL = 'INSERT INTO bucardo.bucardo_log_message(msg) VALUES (?)';
    $sth = $dbh->prepare($SQL);
    $sth->execute($nouns);
    $dbh->commit();
    $VERBOSE and print "Added message\n";

    exit 0;

} ## end of message


sub db_get_notices {

    ## Gather up and return a list of asynchronous notices received since the last check
    ## Arguments: one
    ## 1. Database handle
    ## Returns: arrayref of notices, each an arrayref of name and pid
    ## If using 9.0 or greater, the payload becomes the name

    my ($ldbh) = @_;

    my ($n, @notices);

    while ($n = $ldbh->func('pg_notifies')) {
        my ($name, $pid, $payload) = @$n;
        if ($ldbh->{pg_server_version} >= 9999990000) {
            next if $name ne 'bucardo';
            $name = $payload; ## presto!
        }
        push @notices => [$name, $pid];
    }

    return \@notices;

} ## end of db_get_notices


sub install {

    ## Install Bucardo into a database
    ## Arguments: none
    ## Returns: never, exits

    if (! $bcargs->{batch}) {
        print "This will install the bucardo database into an existing Postgres cluster.\n";
        print "Postgres must have been compiled with Perl support,\n";
        print "and you must connect as a superuser\n\n";
    }

    ## Setup our default arguments for the installation choices
    my $host   = $bcargs->{dbhost} || $ENV{PGHOST} || '<none>';
    my $port   = $bcargs->{dbport} || $ENV{PGPORT} || 5432;
    my $user   = $ENV{DBUSER} || 'postgres';
    my $dbname = $bcargs->{dbname} || $ENV{DBNAME} || 'postgres';

    ## Make sure the bucardo.schema file is available, and extract some config items
    my ($fh, $schema_file) = find_bucardo_schema();
    my %confvar = (piddir => '');
    while (<$fh>) {
        for my $string (keys %confvar) {
            if (/^$string\|(.+?)\|/) {
                $confvar{$string} = $1;
            }
        }
    }
    close $fh or warn qq{Could not close "$schema_file": $!\n};

    ## Make sure each item has a default value
    for my $key (keys %confvar) {
        if (!$confvar{$key}) {
            warn "Could not find default configuration for $key!\n";
        }
    }

    ## If the PID directory was not provided on the command line,
    ## use the value from the bucardo.schema file
    my $piddir = $bcargs->{piddir} || $confvar{piddir};

    ## Keep looping until they are happy with the settings
  GOOEY:
    {

        ## We only don't print this in quiet and batch mode
        if (! $QUIET or ! $bcargs->{batch}) {
            print "Current connection settings:\n";

            print "1. Host:           $host\n";
            print "2. Port:           $port\n";
            print "3. User:           $user\n";
            print "4. Database:       $dbname\n";
            print "5. PID directory:  $piddir\n";
        }

        ## If in batch mode, we accept everything right away and move on
        last GOOEY if $bcargs->{batch};

        print 'Enter a number to change it, P to proceed, or Q to quit: ';

        my $ans = <>;
        print "\n";

        ## If the answer starts with a number, try and apply it
        ## Can also provide the value right away
        if ($ans =~ /^\s*(\d+)(.*)/) {
            my ($num,$text) = (int $1,$2);
            $text =~ s/^\s*(\S+)\s*$/$1/;
            my $new = length $text ? $text : '';

            ## Host: allow anything
            ## Change empty string to '<none>';
            if (1 == $num) {
                if (!length $new) {
                    print 'Change the host to: ';
                    $new = <>;
                    print "\n";
                    chomp $new;
                }
                $host = length $new ? $new : '<none>';
                print "Changed host to: $host\n";
            }

            ## Port: only allow numbers
            elsif (2 == $num) {
                if (!length $new) {
                    print 'Change the port to: ';
                    $new = <>;
                    print "\n";
                    chomp $new;
                }
                if ($new !~ /^\d+$/) {
                    print "-->Sorry, but the port must be a number\n\n";
                    redo GOOEY;
                }
                $port = $new;
                print "Changed port to: $port\n";
            }

            ## User: allow anything except an empty string
            elsif (3 == $num) {
                if (!length $new) {
                    print 'Change the user to: ';
                    $new = <>;
                    print "\n";
                    chomp $new;
                }
                if (! length $new) {
                    print "-->Sorry, you must specify a user\n\n";
                    redo GOOEY;
                }
                $user = $new;
                print "Changed user to: $user\n";
            }

            ## Database: allow anything except an empty string
            elsif (4 == $num) {
                if (!length $new) {
                    print 'Change the database name to: ';
                    $new = <>;
                    print "\n";
                    chomp $new;
                }
                if (! length $new) {
                    print "-->Sorry, you must specify a database name\n\n";
                    redo GOOEY;
                }
                $dbname = $new;
                print "Changed database name to: $dbname\n";
            }

            ## PID directory: allow anything, as long as it starts with a slash
            elsif (5 == $num) {
                if (!length $new) {
                    print 'Change the PID directory to: ';
                    $new = <>;
                    print "\n";
                    chomp $new;
                }
                if (! length $new) {
                    print "-->Sorry, you must specify a directory\n\n";
                    redo GOOEY;
                }
                if ($new !~ m{^/}) {
                    print "-->Sorry, the PID directory must be absolute (start with a slash)\n";
                    redo GOOEY;
                }
                if (! -d $new) {
                    print "-->Sorry, that is not a valid directory\n";
                    redo GOOEY;
                }
                $piddir = $new;
                print "Changed PID dir to: $piddir\n";
            }
        }
        elsif ($ans =~ /^\s*Q/i) {
            die "Goodbye!\n";
        }
        elsif ($ans =~ /^\s*P/i) {
            ## Check on the PID directory before going any further
            ## This is the only item that can be easily checked here
            if (! -d $piddir) {
                print "-->Sorry, that is not a valid PID directory\n";
                redo GOOEY;
            }
            last GOOEY;
        }
        else {
            print "-->Please enter Q to quit, P to proceed, or enter a number to change a setting\n";
        }

        redo GOOEY;

    }

    ## Try to connect
    my $PSQL = sprintf '%s -p %d -U %s -d %s',
        $ENV{PGBINDIR} ? "$ENV{PGBINDIR}/psql" : 'psql',
            $port, $user, $dbname;
    $host !~ /</ and $PSQL .= " --host=$host";

    ## We also want the version, so we grab that as the initial connection test
    my $COM = "$PSQL -c 'SELECT version()'";

    my $res = qx{$COM 2>&1};

    ## Dump any problems verbatim to stderr
    my $delayed_warning;
    if ($res =~ /FATAL|ERROR/ or $res =~ /psql:/) {
        $delayed_warning = $res;
    }

    ## Check for some common errors
    if ($res =~ /role "(.+)" does not exist/) {
        my $baduser = $1;
        if ($baduser eq 'postgres' and exists $ENV{USER} and $ENV{USER} =~ /^[\w-]+$/) {
            $user = $ENV{USER};
            if (!$QUIET and !$bcargs->{batch}) {
                print "Failed to connect as user 'postgres', will try '$user'\n";
            }
        }
        else {
            print "-->Sorry, please try using a different user\n\n";
            exit 1 if $bcargs->{batch};
        }
        goto GOOEY;
    }

    ## Check for some common errors
    if ($res =~ /database "(.+)" does not exist/) {
        my $baddb = $1;
        if ($baddb ne 'postgres') {
            if (!$QUIET and !$bcargs->{batch}) {
                print "Failed to connect to database '$dbname', will try 'postgres'\n";
            }
            $dbname = 'postgres';
            goto GOOEY;
        }
    }

    if ($res !~ /(\d+)\.(\d+)(\S+)/) {
        print "-->Sorry, unable to connect to the database\n\n";
        warn $delayed_warning;
        exit 1 if $bcargs->{batch};
        goto GOOEY;
    }

    ## At this point, we assume a good connection
    ## Assign the version variables
    my ($maj,$min,$rev) = ($1,$2,$3);
    ## We need to be able to handle things such as 9.2devel
    $rev =~ s/^\.//;
    $rev =~ s/(\d+)\.\d+/$1/;

    $QUIET or print "Postgres version is: $maj.$min\n";

    ## Bare minimum for the install is 8.1
    if ($maj < 8 or (8 == $maj and $min < 1)) {
        die "Sorry, Bucardo requires Postgres version 8.1 or higher. This is only $maj.$min\n";
    }

    ## Determine if we need to create the bucardo user
    $COM = qq{$PSQL -c "SELECT 1 FROM pg_user WHERE usename = 'bucardo'"};
    $res = qx{$COM 2>&1};

    ## If no number 1 seen, no bucardo user, so create it
    if ($res !~ /1/) {
      $QUIET or print "Creating superuser 'bucardo'\n";

      ## Generate a new random password
      my $pass = generate_password();
      $SQL = qq{CREATE USER bucardo SUPERUSER PASSWORD '$pass'};
      $COM = qq{$PSQL -c "$SQL"};
      $res = qx{$COM 2>&1};

      ## Put the new password into the .pgpass file
      my $passfile = "$ENV{HOME}/.pgpass";
      my $pfh;
      if (open my $pfh, '>>', $passfile) {
        printf {$pfh} "%s:%s:%s:%s:%s\n",
          $host =~ /^\w/ ? $host : '*',
          $port =~ /^\d/ ? $port : '*',
          '*',
          'bucardo',
          $pass;
        close $pfh or warn qq{Could not close file "$passfile": $!\n};
        chmod 0600, $passfile;
      }
      else {
        print qq{Could not append password information to file "$passfile"\n};
        print qq{Password for user bucardo is: $pass\n};
        print qq{You probably want to change it or put into a .pgpass file\n};
      }
    }

    ## Now we apply the bucardo.schema to the new database
    $COM = "$PSQL -AX -qt -f $schema_file 2>&1";

    print "Attempting to create and populate the bucardo database and schema\n"
        if ! $bcargs->{batch};

    $res= qx{$COM};
    chomp $res;

    ## Detect case where bucardo is already there
    ## This probably needs to be i18n safe
    if ($res =~ /relation .* already exists/) {
        warn "\nINSTALLATION FAILED! Looks like you already have Bucardo installed there.\n";
        warn "Try running 'bucardo upgrade' instead.\n";
        warn "If you are trying to completely reinstall Bucardo,\n";
        warn "drop the bucardo database, and the bucardo schema from all databases.\n\n";
        exit 1;
    }

    if ($res =~ /"plperlu".*CREATE LANGUAGE/s) {
        warn "\nINSTALLATION FAILED! ($res)\n\n";
        warn "The Pl/PerlU language needs to be available\n";
        warn "This is usually available as a separate package\n";
        warn "For example, you might try: yum install postgresql-plperl\n";
        warn "If compiling from source, add the --with-perl option to your ./configure command\n\n";
        exit 1;
    }

    ## This can actually happen for many reasons: lack of this message
    ## simply means something went wrong somewhere
    if ($res !~ m{Pl/PerlU was successfully installed}) {
        warn "\nINSTALLATION FAILED! ($res)\n\n";
        exit 1;
    }

    ## We made it! All downhill from here
    print "Database creation is complete\n\n" if ! $bcargs->{batch};

    ## Whether or not we really need to, change some bucardo_config items:
    my $BDSN  = 'dbi:Pg:dbname=bucardo';
    $host and $host ne '<none>' and $BDSN .= ";host=$host";
    $port and $BDSN .= ";port=$port";
    $dbh = DBI->connect($BDSN, 'bucardo', '', {AutoCommit=>0,RaiseError=>1,PrintError=>0});
    $dbh->do('SET search_path = bucardo');

    $SQL = 'UPDATE bucardo.bucardo_config SET setting = ? WHERE name = ?';
    $sth = $dbh->prepare($SQL);
    $confvar{piddir} = $piddir;
    for my $key (sort keys %confvar) {
        $count = $sth->execute($confvar{$key}, $key);
        if ($count != 1) {
            warn "!! Failed to set $key to $confvar{$key}\n";
        }
        else {
            print qq{Updated configuration setting "$key"\n} if ! $bcargs->{batch};
        }
    }
    $dbh->commit();

    $QUIET or print "Installation is now complete.\n";
    ## A little less verbose if in batch mode
    if (! $bcargs->{batch}) {
        print "If you see errors or need help, please email bucardo-general\@bucardo.org\n\n";

        print "You may want to check over the configuration variables next, by running:\n";
        print "$progname show all\n";
        print "Change any setting by using: $progname set foo=bar\n\n";
    }

    exit 0;

} ## end of install


##
## Internal helper subs
##

sub debug {

    ## Print a debug line if needed
    ## Arguments: one or two
    ## 1. String to be printed
    ## 2. Required debug level: defaults to 1
    ## Returns: undef

    return if ! $DEBUG;

    my $string = shift;
    my $level = shift || 1;

    return if $DEBUG < $level;

    chomp $string;

    print " |DEBUG| $string\n";

    return;

} ## end of debug


sub standardize_name {

    ## Return canonical version of certain names
    ## Normalizes abbreviations, misspelling, plurals, case, etc.
    ## Arguments: one
    ## 1. Name
    ## Returns: canonical name

    my $name = shift;

    return 'customcode' if $name =~ /^c?code/i or $name =~ /^custom_?code/i;

    return 'customname' if $name =~ /^cname/i or $name =~ /^custom_?name/i;

    return 'customcols' if $name =~ /^ccol/i or $name =~ /^custom_?col/i;

    return 'dbgroup'    if $name =~ /^dbg/i or $name =~ /^d.+group/i;

    return 'database'   if $name =~ /^db/i or $name =~ /^database/i;

    return 'herd'       if $name =~ /^(?:relgr|herd)/i;

    return 'sync'       if $name =~ /^s[yi]n[ck]/i;

    return 'table'      if $name =~ /^tab/i or $name =~ /^tbale/i;

    return 'sequence'   if $name =~ /^seq/i;

    return 'all'        if $name =~ /^all$/i;

    return 'config'     if $name =~ /^config/i;

    return 'clone'      if $name =~ /^clon/i;

    return $name;

} ## end of standardize_name


sub generate_password {

    ## Generate a random 42 character password
    ## Arguments: none
    ## Returns: new password

    my @chars = split // => q!ABCDEFGHJKMNPQRSTWXYZabcdefghjkmnpqrstwxyz23456789@#%^&(){}[];./!;
    my $pass = join '' => @chars[map{ rand @chars }(1..42)];

    return $pass;

} ## end of generate_password


sub process_simple_args {

    ## Process args to an inner function in the style of a=b
    ## Arguments: one
    ## 1. Custom hashref
    ## Returns: db column hashref, columns string, placeholders string,
    ##    values string, and 'extra' hashref

    my $arg = shift;
    my $validcols   = $arg->{cols}        or die 'Need a list of valid cols!';
    my $list        = $arg->{list}        or die 'Need a list of arguments!';
    my $doc_section = $arg->{doc_section} or die 'Need a doc_section!';

    my %item;
    my %dbcol;
    my %extra;
    my %othername;

    ## Transform array of x=y into a hashref
    my $xyargs = process_args(join ' ' => map { s/[=:]\s*(\w+ .*)/="$1"/; $_; } @$list);

    ## Parse the validcols string, and setup any non-null defaults
    for my $row (split /\n/ => $validcols) {
        next if $row !~ /\w/ or $row =~ /^#/;
        $row =~ /^\s*(\S+)\s+(\S+)\s+(\S+)\s+(.+)/ or die "Invalid valid cols ($row)";
        my ($args,$dbcol,$flag,$default) = ([split /\|/ => $1],$2,$3,$4);
        my $alias = @{$args}[-1];
        for my $name (@$args) {
            $item{$name} = [$dbcol,$flag,$default];
            $othername{$name} = $alias;
        }
        ## Process environment variable default
        if ($default =~ s/^ENV://) {
            for my $env (split /\|/ => $default) {
                if ($ENV{$env}) {

                    ## Skip if it starts with PG and this is not postgres
                    next if $env =~ /^PG/ and exists $xyargs->{type} and $xyargs->{type} ne 'postgres';

                    $dbcol{$dbcol} = $ENV{$env};
                    last;
                }
            }
        }
        elsif ($default ne 'null' and $default ne 'skip') {
            $dbcol{$dbcol} = $default;
        }
    }

    for my $arg (sort keys %$xyargs) {

        next if $arg eq 'extraargs';

        if (! exists $item{$arg}) {
            warn "Unknown option '$arg'\n";
            usage_exit($doc_section);
        }

        (my $val = $xyargs->{$arg}) =~ s/^\s*(\S+)\s*$/$1/;

        if ($item{$arg}[2] eq 'skip') {
            $extra{$othername{$arg}} = $val;
            next;
        }

        my ($dbcol,$flag,$default) = @{$item{$arg}};
        if ($flag eq '0') {
            ## noop
        }
        elsif ($flag eq 'TF') {
            $val =~ s/^\s*t(?:rue)*\s*$/1/i;
            $val =~ s/^\s*f(?:alse)*\s*$/0/i;
            $val =~ s/^\s*on*\s*$/1/i;
            $val =~ s/^\s*off*\s*$/0/i;
            $val =~ s/^\s*yes*\s*$/1/i;
            $val =~ s/^\s*no*\s*$/0/i;
            if ($val !~ /^[01]$/) {
                die "Invalid value for '$arg': must be true or false\n";
            }
        }
        elsif ($flag eq 'numeric') {
            if ($val !~ /^\d+$/) {
                die "Invalid value for '$arg': must be numeric\n";
            }
        }
        elsif ($flag =~ /^=(.+)/) {
            my $ok = 0;
            for my $okval (split /\|/ => $1) {
                if ($okval =~ /~/) { ## aliases - force to the first one
                    my @alias = split /~/ => $okval;
                    for my $al (@alias) {
                        if ($val eq $al) {
                            $ok = 1;
                            last;
                        }
                    }
                    if ($ok) {
                        $val = $alias[0];
                        last;
                    }
                }
                elsif (lc $val eq lc $okval) {
                    $ok = 1;
                    last;
                }
            }
            if (!$ok) {
                (my $arglist = $flag) =~ s/\|/ or /g;
                $arglist =~ s/^=//;
                $arglist =~ s/~\w+//g;
                die "Invalid value for '$arg': must be one of $arglist\n";
            }
        }
        elsif ($flag eq 'interval') {
            ## Nothing for now
        }
        else {
            die "Unknown flag '$flag' for $arg";
        }

        ## Value has survived our minimal checking. Store it and clobber any default
        $dbcol{$dbcol} = $val;

    }

    ## Apply any magic
    if (exists $arg->{morph}) {
        for my $mline (@{$arg->{morph}}) {
            if (exists $mline->{field}) {
                next unless exists $dbcol{$mline->{field}};
                if (exists $mline->{new_defaults}) {
                    for my $change (split /\s+/ => $mline->{new_defaults}) {
                        my ($f,$v) = split /\|/ => $change;
                        next if exists $dbcol{$f};
                        $dbcol{$f} = $v;
                    }
                }
                if (exists $mline->{dash_to_white}) {
                    $dbcol{$mline->{field}} =~ s/_/ /g;
                }
            }
            else {
                die "Do not know how to handle that morph!\n";
            }
        }
    }

    ## Automatic morphing magic
    if (exists $item{status} and ! exists $dbcol{status}) {
        for my $stat (qw/ active inactive /) {
            if (grep { $_ eq $stat } @{ $xyargs->{extraargs} }) {
                $dbcol{status} = $stat;
            }
        }
    }

    ## Build the lists of columns and placeholders for the SQL statement
    my ($cols,$phs,$vals) = ('','',{});
    for my $col (sort keys %dbcol) {
        $cols .= "$col,";
        $phs .= '?,';
        $vals->{$col} = $dbcol{$col};
    }
    $cols =~ s/,$//;
    $phs =~ s/,$//;

    return \%dbcol, $cols, $phs, $vals, \%extra;

} ## end of process_simple_args


sub check_recurse {

    ## Call a sub recursively depending on first argument
    ## Arguments: three or more
    ## 1. Type of thing (e.g. database)
    ## 2. Name of the thing
    ## 3. Any additional actions
    ## Returns: 0 or 1

    my ($thing, $name, @actions) = @_;

    my $caller = (caller(1))[3];

    ## If the name is 'all', recursively call on all objects of this type
    if ($name =~ /all/i) {
        for my $item (sort keys %$thing) {
            &$caller($item, @actions);
        }
        return 0;
    }

    ## If we have a wildcard, recursively call all matching databases
    if ($name =~ s/[*%]/\.*/g) {
        my @list = grep { $_ =~ /^$name$/ } keys %$thing;
        if (! @list) {
            die qq{No matching items found\n};
        }
        for my $item (sort @list) {
            &$caller($item, @actions);
        }
        return 0;
    }

    return 1;

} ## end of check_recurse


sub extract_name_and_role {

    ## Given a group or db name with optional role information, return both
    ## Also returns optional list of other items, e.g. ABC:target:pri=2:gangs=2
    ## Arguments: one
    ## 1. Group or database name: 'foo' or 'foo:master'
    ## Returns: name, role name, and hashref of 'extra' info

    my $name = shift or die;

    ## Role always defaults to 'target'
    my $role = 'target';

    ## Check for a role attached to the group name
    if ($name =~ s/:([^:]+)//) {
        $role = lc $1;
    }

    ## Look for any additional items
    my %extra;
    while ($name =~ s/:([^:]+)//) {
        my $extra = $1;
        if ($extra !~ /(\w+)=([\w\d]+)/) {
            die qq{Invalid value "$extra"\n};
        }
        my ($lname,$val) = ($1,$2);
        if ($lname =~ /make?delta/i) {
            $extra{'makedelta'} = make_boolean($val);
        }
        elsif ($lname =~ /gang/i) {
            $extra{'gang'} = $val;
        }
        elsif ($lname =~ /pri/i) {
            $extra{'priority'} = $val;
        }
        else {
            die qq{Unknown value "$lname": must be priority, gang, or makedelta\n};
        }
    }

    ## Valid group name?
    if ($name !~ /^[\w\d]+$/) {
        die "Invalid name: $name\n";
    }

    ## Valid role name?
    if ($role !~ /^(?:master|target|t|slave|rep|replica|source|s|fullcopy)$/) {
        die "Invalid database role: $role\n";
    }

    ## Standardize the names
    $role = 'source' if $role =~ /^(?:master|s)$/;
    $role = 'target' if $role =~ /^(?:slave|rep|replica|tar|t)$/;

    return $name, $role, \%extra;

} ## end of extract_name_and_role


sub load_bucardo_info {

    ## Load of all information from the database into global hashes
    ## Arguments: one
    ## 1. Boolean: if true, force run even if we've run once already
    ## Returns: undef

    my $force = shift || 0;

    return if exists $global{db} and ! $force;

    ## Grab all database information
    $SQL = 'SELECT *, EXTRACT(epoch FROM cdate) AS epoch FROM bucardo.db';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    my $db = $sth->fetchall_hashref('name');

    ## Grab all database information
    $SQL = 'SELECT * FROM bucardo.dbgroup';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    my $dbgroup = $sth->fetchall_hashref('name');

    ## Figure out if each dbgroup is using multiple gangs
    my %gang;

    ## Map databases to their groups
    $SQL = 'SELECT * FROM bucardo.dbmap';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    for my $row (@{$sth->fetchall_arrayref({})}) {
        $db->{$row->{db}}{group}{$row->{dbgroup}} = $row;

        ## Tally up the roles each database fills
        $db->{$row->{db}}{roles}{$row->{role}}++;

        ## Mark if this db is ever used as a source, for help in adding table
        $db->{$row->{db}}{issource}++ if $row->{role} eq 'source';

        $dbgroup->{$row->{dbgroup}}{db}{$row->{db}} = $row;
        ## Figure out how many gangs each group has
        $gang{$row->{dbgroup}}{$row->{gang}}++;
    }

    for my $group (keys %$dbgroup) {
        $dbgroup->{$group}{gangs} = keys %{ $gang{$group} };
    }

    ## Grab all goat information
    $SQL = 'SELECT * FROM bucardo.goat';
    $sth = $dbh->prepare($SQL);
    $sth->execute();

    my $goat;
    $goat->{by_id} = $sth->fetchall_hashref('id');
    $goat->{by_table} = {};

    for my $key (%{$goat->{by_id}}) {
        next if $key !~ /^\d/;
        my $tname = $goat->{by_id}{$key}{tablename};
        my $name = "$goat->{by_id}{$key}{schemaname}.$tname";
        my $dbname = $goat->{by_id}{$key}{db};

        ## Index by database, so different databases containing matching object
        ##   names can be handled
        $goat->{by_db}{$dbname}{$name} = $goat->{by_id}{$key};

        ## Index by full object name
        if (! exists $goat->{by_fullname}{$name}) {
            $goat->{by_fullname}{$name} = [ $goat->{by_id}{$key} ];
        }
        else {
            push @{$goat->{by_fullname}{$name}}, $goat->{by_id}{$key};
        }

        ## Also want a table-only version:
        $goat->{by_table}{$tname} = [] unless exists $goat->{by_table}{$tname};
        push @{$goat->{by_table}{$tname}} => $goat->{by_id}{$key};
    }

    ## Grab all herd information
    $SQL = 'SELECT * FROM bucardo.herd';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    my $herd = $sth->fetchall_hashref('name');

    ## Grab all herdmap information, stick into previous hashes
    $SQL = 'SELECT * FROM bucardo.herdmap ORDER BY priority DESC, goat ASC';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    for my $row (@{$sth->fetchall_arrayref({})}) {
        my ($g,$h,$p) = @$row{qw/goat herd priority/};
        $goat->{by_id}{$g}{herd}{$h} = $p;
        $herd->{$h}{goat}{"$goat->{by_id}{$g}{schemaname}.$goat->{by_id}{$g}{tablename}"} = {
            id       => $g,
            priority => $p,
            reltype  => $goat->{by_id}{$g}{reltype},
            schema   => $goat->{by_id}{$g}{schemaname},
            table    => $goat->{by_id}{$g}{tablename},
        };
        my ($s,$t) = @{$goat->{by_id}{$g}}{qw/schemaname tablename/};
        $herd->{$h}{hasgoat}{$s}{$t} = $p;
        ## Assign each herd to a datbase via its included goats
        $herd->{$h}{db} = $goat->{by_id}{$g}{db};
    }

    ## Grab all sync information
    $SQL = 'SELECT * FROM bucardo.sync';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    my $sync;
    for my $row (@{$sth->fetchall_arrayref({})}) {
        my ($name,$p,$sherd,$dbs) = @$row{qw/name priority herd dbs/};
        $sync->{$name} = $row;
        ## Add in herd information
        $sync->{$name}{herd} = $herd->{$sherd};
        ## Add this sync back to the herd
        $herd->{$sherd}{sync}{$name}++;
        ## Grab the databases used by this sync
        $sync->{$name}{dblist} = $dbgroup->{$dbs}{db};
        ## Map each database back to this sync, along with its type (source/target)
        for my $dbname (keys %{ $sync->{$name}{dblist} }) {
            $db->{$dbname}{sync}{$name} = $sync->{$name}{dblist}{$dbname};
        }
        ## Note which syncs are used by each goat
        for my $row2 (sort keys %{$row->{herd}{goat}}) {
            $goat->{by_id}{$row2}{sync}{$name} = 1;
        }
    }

    ## Grab all customcode information
    $SQL = 'SELECT * FROM bucardo.customcode';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    my $cc = $sth->fetchall_hashref('name');
    $SQL = 'SELECT * FROM bucardo.customcode_map';
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    my %codename;
    for my $row (values %$cc) {
        $codename{$row->{id}} = $row->{name};
    }
    for my $row (@{$sth->fetchall_arrayref({})}) {
        my $codename = $codename{$row->{code}};
        push @{$cc->{$codename}{map}} => $row;
    }

    ## Grab all customname information
    $SQL = q{SELECT c.id, c.goat, c.newname,
COALESCE(c.sync, '') AS sync,
COALESCE(c.db, '') AS db,
g.schemaname || '.' || g.tablename AS tname
FROM bucardo.customname c
JOIN goat g ON (g.id = c.goat)
};
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    $CUSTOMNAME = {};
    for my $row (@{ $sth->fetchall_arrayref({}) }) {
        ## We store three versions

        ## Look things up by the internal customname id: used for 'delete customname'
        ## Only one entry per id
        $CUSTOMNAME->{id}{$row->{id}} = $row;

        ## Look things up by the goat id: used to check for existing entries
        ## Can have multiple entries per goat
        $CUSTOMNAME->{goat}{$row->{goat}}{$row->{db}}{$row->{sync}} = $row;

        ## A simple list of all rows: used for 'list customnames'
        push @{ $CUSTOMNAME->{list} } => $row;
    }

    ## Grab all customcols information
    $SQL = q{SELECT c.id, c.goat, c.clause,
COALESCE(c.sync, '') AS sync,
COALESCE(c.db, '') AS db,
g.schemaname || '.' || g.tablename AS tname
FROM bucardo.customcols c
JOIN goat g ON (g.id = c.goat)
};
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    $CUSTOMCOLS = {};
    for my $row (@{ $sth->fetchall_arrayref({}) }) {
        ## We store three versions: one for quick per-goat lookup,
        ## one by the assigned id, and one just a big list
        push @{ $CUSTOMCOLS->{goat}{$row->{goat}}{$row->{clause}} } => $row;
        $CUSTOMCOLS->{id}{$row->{id}} = $row;
        push @{ $CUSTOMCOLS->{list} } => $row;
    }

    $global{cc}      = $CUSTOMCODE = $cc;
    $global{dbgroup} = $DBGROUP = $dbgroup;
    $global{db}      = $DB   = $db;
    $global{goat}    = $GOAT = $goat;
    $global{herd}    = $HERD = $RELGROUP = $herd;
    $global{sync}    = $SYNC = $sync;

    ## Separate goat into tables and sequences
    for my $id (keys %{$GOAT->{by_id}}) {
        ## Ids only please
        next if $id !~ /^\d+$/;
        my $type = $GOAT->{by_id}{$id}{reltype};
        if ($type eq 'table') {
            $TABLE->{$id} = $GOAT->{by_id}{$id};
        }
        elsif ($type eq 'sequence') {
            $SEQUENCE->{$id} = $GOAT->{by_id}{$id};
        }
        else {
            die "Unknown relation type $type!";
        }
    }

    ## Grab all clone information
    $SQL = qq{SELECT *,
      TO_CHAR(started,'$DATEFORMAT') AS pstarted,
      TO_CHAR(ended,'$DATEFORMAT') AS pended
      FROM bucardo.clone};
    $sth = $dbh->prepare($SQL);
    $sth->execute();
    $CLONE = {};
    for my $row (@{ $sth->fetchall_arrayref({}) }) {
        $CLONE->{$row->{id}} = $row;
    }

    return;

} ## end of load_bucardo_info


sub transform_name {

    ## Change a given word to a more standard form
    ## Generally used for database column names, which follow some simple rules
    ## Arguments: one
    ## 1. Name to transform
    ## Returns: transformed name

    my $name = shift;

    ## Complain right away if these are not standard characters
    if ($name !~ /^[\w ]+$/) {
        die "Invalid name: $name\n";
    }

    ## Change to lowercase
    $name = lc $name;

    ## Change dashes and spaces to underscores
    $name =~ s{[- ]}{_}go;

    ## Compress all underscores
    $name =~ s{__+}{_}go;

    ## Fix common spelling errors
    $name =~ s{perpare}{prepare}go;

    ## Look up standard abbreviations
    if (exists $alias{$name}) {
        $name = $alias{$name};
    }

    return $name;

} ## end of transform_name


sub transform_value {

    ## Change a value to a more standard form
    ## Used for database column SET actions
    ## Arguments: one
    ## 1. Value
    ## Returns: transformed value

    my $value = shift;

    ## Remove all whitespace on borders
    $value =~ s/^\s*(\S+)\s*$/$1/;

    ## Change booleans to 0/1
    $value =~ s/^(?:t|true)$/1/io;
    $value =~ s/^(?:f|false)$/0/io;

    return $value;

} ## end of transform_value


sub make_boolean {

    ## Transform some string into a strict boolean value
    ## Arguments: one
    ## 1. String to be analyzed
    ## Returns: the string literals 'true' or 'false' (unquoted)

    my $value = shift;

    $value = lc $value;

    return 'true' if $value =~ /^(?:t|true|1|yes)$/o;

    return 'false' if $value =~ /^f|false|0|no$/o;

    die "Invalid value: must be 'true' of 'false'\n";

} ## end of make_boolean


sub standardize_rdbms_name {

    ## Make the database types standard: account for misspellings, case, etc.
    ## Arguments: one
    ## 1. Name of a database type
    ## Returns: modified name

    my $name = shift;

    $name =~ s/postgres.*/postgres/io;
    $name =~ s/pg.*/postgres/io;
    $name =~ s/driz?zle.*/drizzle/io;
    $name =~ s/mongo.*/mongo/io;
    $name =~ s/mysql.*/mysql/io;
    $name =~ s/maria.*/mariadb/io;
    $name =~ s/oracle.*/oracle/io;
    $name =~ s/redis.*/redis/io;
    $name =~ s/sqll?ite.*/sqlite/io;

    return $name;

} ## end of standardize_rdbms_name


sub find_best_db_for_searching {

    ## Returns the db from $DB most likely to contain tables to add
    ## Basically, we use source ones first, then the date added
    ## Arguments: none
    ## Returns: database name or undef if no databases defined yet

    for my $db (
        map { $_->[0] }
        sort {
            ## Source databases are always first
            $a->[1] <=> $b->[1]
            ## First created are first
            or $a->[2] <=> $b->[2]
            ## All else fails, sort by name
            or $a->[0] cmp $b->[0] }
        map { [
               $_,
               exists $DB->{$_}{issource} ? 0 : 1,
               $DB->{$_}{epoch},
               lc $_,
              ]
            }
        keys %{ $DB } ) {
        return $db;
    }

    ## Probably an error, but let the caller handle it:

    return undef;

} ## end of find_best_db_for_searching


##
## Subs to perform common SQL actions
##

sub confirm_commit {

    ## Perform a database commit unless the user does not want it
    ## Arguments: none
    ## Returns: true for commit, false for rollback

    ## The dryrun option overrides everything else: we never commit
    if ($bcargs->{dryrun}) {
        $VERBOSE and print "In dryrun mode, so not going to commit database changes\n";
        return 0;
    }

    if ($bcargs->{confirm}) {
        print 'Commit the changes? Y/N ';
        if (<STDIN> !~ /Y/i) {
            $dbh->rollback();
            print "Changes have been rolled back\n";
            return 0;
        }
        else {
            $dbh->commit();
            print "Changes have been committed\n";
        }
    }
    else {
        $dbh->commit();
    }

    return 1;

} ## end of confirm_commit


sub add_db_to_group {

    ## Add a database to a group
    ## Will create the group as needed
    ## Does not commit
    ## Arguments: two
    ## 1. Database name
    ## 2. Group name (may have :role specifier)
    ## Returns: group name and role name

    my ($db,$fullgroup) = @_;

    ## Figure out the role. Defaults to target
    my ($group,$role) = extract_name_and_role($fullgroup);

    if (! exists $DBGROUP->{$group}) {
        ## Extra argument prevents load_bucardo_info from being called by the sub
        create_dbgroup($group, 1);
    }

    $SQL = 'INSERT INTO bucardo.dbmap(db,dbgroup,role) VALUES (?,?,?)';
    $sth = $dbh->prepare($SQL);
    eval {
        $sth->execute($db,$group,$role);
    };
    if ($@) {
        my $message = qq{Cannot add database "$db" to dbgroup "$group"};
        if ($@ =~ /"dbmap_unique"/) {
            die qq{$message: already part of the group\n};
        }
        die qq{$message: $@\n};
    }

    ## Reload our hashes
    load_bucardo_info(1);

    return $group, $role;

} ## end of add_db_to_group


sub remove_db_from_group {

    ## Removes a database from a group: deletes from bucardo.dbmap
    ## Does not commit
    ## Arguments: two
    ## 1. Database name
    ## 2. Group name
    ## 3. Boolean: if true, prevents the reload
    ## Returns: undef

    my ($db,$group,$noreload) = @_;

    $SQL = 'DELETE FROM bucardo.dbmap WHERE db=? AND dbgroup=?';
    $sth = $dbh->prepare_cached($SQL);
    $sth->execute($db, $group);

    ## Reload our hashes
    $noreload or load_bucardo_info(1);

    return;

} ## end of remove_db_from_group


sub change_db_role {

    ## Changes the role of a database: updates bucardo.dbmap
    ## Does not commit
    ## Arguments: four
    ## 1. New role
    ## 2. Name of the dbgroup
    ## 3. Name of the database
    ## 4. Boolean: if true, prevents the reload
    ## Returns: undef

    my ($role,$group,$db,$noreload) = @_;

    $SQL = 'UPDATE bucardo.dbmap SET role=? WHERE dbgroup=? AND db=?';
    $sth = $dbh->prepare_cached($SQL);
    $sth->execute($role,$group,$db);

    ## Reload our hashes
    $noreload or load_bucardo_info(1);

    return;

} ## end of change_db_role


sub update_dbmap {

    ## Update the values in the bucardo.dbmap table
    ## Arguments: three
    ## 1. Name of the database
    ## 2. Name of the dbgroup
    ## 3. Hashref of things to change
    ## Returns: undef

    my ($db,$group,$changes) = @_;

    ## This should not need quoting as they are all [\w\d]
    my $list = join ',' => map { "$_=$changes->{$_}" } sort keys %$changes;

    $SQL = "UPDATE bucardo.dbmap SET $list WHERE db=? AND dbgroup=?";
    $sth = $dbh->prepare($SQL);
    $sth->execute($db, $group);

    return;

} ## end of update_dbmap


sub create_herd {

    ## Creates a new entry in the bucardo.herd table
    ## Caller should have already checked for existence
    ## Does not commit
    ## Arguments: two
    ## 1. Name of the new herd
    ## 2. Boolean: if true, prevents the reload
    ## Returns: name of the herd just created

    my ($name,$noreload) = @_;

    $SQL = 'INSERT INTO bucardo.herd(name) VALUES (?)';
    $sth = $dbh->prepare($SQL);
    eval {
        $sth->execute($name);
    };
    if ($@) {
        print qq{Failed to create relgroup "$name"\n$@\n};
        exit 1;
    }

    ## Reload our hashes
    $noreload or load_bucardo_info(1);

    return $name;

} ## end of create_herd


__END__

=head1 NAME

bucardo - utility script for controlling the Bucardo program

=head1 VERSION

This document describes version 5.4.1 of bucardo

=head1 USAGE

  bucardo [<options>] <command> [<action>] [<command-options>] [<command-params>]

=head1 DESCRIPTION

The bucardo script is the main interaction to a running Bucardo instance. It
can be used to start and stop Bucardo, add new items, kick syncs, and even
install and upgrade Bucardo itself. For more complete documentation, please
view L<the wiki|http://bucardo.org/>.

=head1 COMMANDS

Run C<< bucardo help <command> >> for additional details

=over

=item C<install>

Installs the Bucardo configuration database.

=item C<upgrade>

Upgrades the Bucardo configuration database to the latest schema.

=item C<< start [<start options>] [<reason>] >>

Starts Bucardo.

=item C<< stop [<reason>] >>

Stops Bucardo.

=item C<< restart [<start options>] [<reason>] >>

Stops and starts Bucardo.

=item C<< list <type> [<regex>] >>

Lists objects managed by Bucardo.

=item C<< add <type> <name> <parameters> >>

Adds a new object.

=item C<< update <type> <name> <parameters> >>

Updates an object.

=item C<< remove <type> <name> [<name>...] >>

Removes one or more objects.

=item C<< kick <syncname> [<sync options>] [<syncname>...] [<timeout>] >>

Kicks off one or more syncs.

=item C<reload config>

Sends a message to all CTL and KID processes asking them to reload the Bucardo
configuration.

=item C<reopen>

Sends a message to all Bucardo processes asking them to reopen any log files
they may have open. Call this after you have rotated the log file(s).

=item C<< show all|<setting> [<setting>...] >>

Shows the current Bucardo settings.

=item C<<set <setting=value> [<setting=value>...] >>

Sets one or more configuration setting..

=item C<< ping [<timeout>] >>

Sends a ping notice to the MCP process to see if it will respond.

=item C<< status [<status options>] <syncname> [<syncname>...] >>

Shows the brief status of syncs in a tabular format.

=item C<< activate <syncname> [<syncname>...] [<timeout>] >>

Activates one or more named syncs.

=item C<< deactivate <syncname> [<syncname>...] [<timeout>] >>

Deactivates one or more named syncs.

=item C<< message <body> >>

Sends a message to the running Bucardo logs.

=item C<< reload [<syncname> [<syncname>...]] >>

Sends a message to one or more sync processes, instructing them to reload.

=item C<< inspect <type> <name> [<name>...] >>

Inspects one or more objects of a particular type.

=item C<< validate all|<syncname> [<syncname>...] >>

Validates one or more syncs.

=item C<< purge all|<table> [<table>...] >>

Purges the delta and track tables for one or more tables, for one or more
databases.

=item C<< delta [<database(s)>] >>

Show the delta counts for each source target.

=item C<< help [<command> [<action>]] >>

Shows help.

=back

=head1 OPTIONS

  -d --db-name       NAME  Database name.
  -U --db-user       USER  Database user name.
  -P --db-pass       PASS  Database password.
  -h --db-host       HOST  Database server host name.
  -p --db-port       PORT  Database server port number.
     --bucardorc     FILE  Use specified .bucardorc file.
     --no-bucardorc        Do not use .bucardorc file.
     --quiet               Incremental quiet.
     --verbose             Incremental verbose mode.
  -? --help                Output basic help and exit.
     --version             Print the version number and exit.
     --dryrun              Do not perform any actual actions.
     --confirm             Require direct confirmation before changes.

=head1 COMMAND DETAILS

Most of the commands take parameters. These may be passed after the command
name and, where appropriate, an object name. Parameters take the form of
key/value pairs separated by an equal sign (C<=>). For example:

  bucardo add db sea_widgets dbname=widgets host=db.example.com

Here C<dbname> and <host> are parameters.

Many of the commands also use command-line options, which are specified in the
normal way. For example, the C<bucardo add db> command could also be written
as:

  bucardo add db sea_widgets --dbname widgets --dbhost db.example.com

However, parameters and options are not directly interchangeable in all cases.
See the documentation for individual commands for their supported options.

=head2 install

  bucardo install

Installs the Bucardo schema from the file F<bucardo.schema> into an existing Postgres cluster.
The user "bucardo" and database "bucardo" will be created first as needed. This is an
interactive installer, but you can supply the following values from the command line:

=over

=item C<--dbuser>

defaults to postgres

=item C<--dbname>

defaults to postgres

=item C<--dbport>

defaults to 5432

=item C<--pid-dir>

defaults to /var/run/bucardo/

=back

=head2 upgrade

  bucardo upgrade

Upgrades an existing Bucardo installation to the current version of the bucardo database
script. Requires that bucardo and the F<bucardo.schema> file be the same version. All
changes should be backwards compatible, but you may need to re-validate existing scripts
to make sure changes get propagated to all databases.

=head2 start

  bucardo start "Reason"

Starts Bucardo. Fails if the MCP process is running (determined if its PID file is present).
Otherwise, starts cleanly by first issuing the equivalent of a stop to ask any existing Bucardo
processes to exit, and then starting a new Bucardo MCP process. A short reason and name should
be provided - these are written to the C<reason_file> file (F<./bucardo.restart.reason.txt> by
default) and sent in the email sent when Bucardo has been started up. It is also appended to
the reason log, which has the same name as the the C<reason_file> but ends in F<.log>.

The options for the C<start> command are:

=over

=item C<--sendmail>

Tells Bucardo whether or not to send mail on interesting events: startup,
shutdown, and errors. Default is on.

=item C<--extra-name string>

A short string that will be appended to the version string as output by the
Bucardo process names. Mostly useful for debugging.

=item C<--log-destination destination>

Determines the destination for logging output. The supported values are:

=over

=item C<stderr>

=item C<stdout>

=item C<syslog>

=item C<none>

=item A file system directory.

=back

May be specified more than once, which is useful for, e.g., logging both to a
directory and to syslog. If C<--log-destination> is not specified at all, the
default is to log to files in F</var/log/bucardo>.

=item C<--log-separate>

Forces creation of separate log files for each Bucardo process of the form
"log.bucardo.X.Y", where X is the type of process (MCP, CTL, or KID), and Y is
the process ID.

=item C<--log-extension string>

Appends the given string to the end of the default log file name,
F<log.bucardo>. A dot is added before the name as well, so a log extension of
"rootdb" would produce a log file named F<log.bucardo.rootdb>.

=item C<--log-clean>

Forces removal of all old log files before running.

=item C<--debug>

=item C<--no-debug>

Enable or disable debugging output. Disabled by default.

=item C<--exit-on-nosync>

=item C<--no-exit-on-nosync>

On startup, if Bucardo finds no active syncs, it normally will continue to
run, requiring a restart once syncs are added. This is useful for startup
scripts and whatnot.

If, however, you want it to exit when there are no active syncs, pass the
C<--exit-on-nosync> option. You can also be explicit that it should I<not>
exit when there are no syncs by passing C<--no-exit-on-nosync>. This is the
default value.

=back

=head2 stop

  bucardo stop "Reason"

Forces Bucardo to quit by creating a stop file which all MCP, CTL, and KID processes should
detect and cause them to exit. Note that active syncs will not exit right away, as they
will not look for the stop file until they have finished their current run. Typically,
you should scan the list of processes after running this program to make sure that all Bucardo
processes have stopped. One should also provide a reason for issuing the stop - usually
this is a short explanation and your name. This is written to the C<reason_file> file
(F<./bucardo.restart.reason.txt> by default) and is also used by Bucardo when it exits and
sends out mail about its death. It is also appended to the reason log, which has the same name
as the the C<reason_file> but ends in F<.log>.

=head2 restart

  bucardo restart "Reason"

Stops bucardo, waits for the stop to complete, and then starts it again.
Supports the same options as <C<start>/start>. Useful for start scripts. For
getting just CTL and KID processes to recognize newly added, updated, or
removed objects, use the C<reload> command, instead.

=head2 list

  bucardo list <type> <regex>

Lists summary information about Bucardo objects. The supported types are:

=over

=item * C<database>

=item * C<dbgroup>

=item * C<relgroup>

=item * C<sync>

=item * C<table>

=item * C<sequence>

=item * C<customcode>

=item * C<customname>

=item * C<customcols>

=item * C<all>

=back

The C<all> option will list information about all object types.

The optional C<regex> option can be used to filter the list to only those
matching a regular expression.

=head2 add

  bucardo add <type> <name> <parameters>

Adds a new object to Bucardo. The C<type> specifies the type of object to add,
while the C<name> should be the name of the object. The supported types
include:

=over

=item C<db>

=item C<dbgroup>

=item C<table>

=item C<sequence>

=item C<all tables>

=item C<all sequences>

=item C<relgroup>

=item C<sync>

=item C<customname>

=item C<customcols>

=back

=head3 add db

  bucardo add db <name> dbname=actual_name port=xxx host=xxx user=xxx

Adds one or more new databases. The C<name> is the name by which the database will be
known to Bucardo, and must be unique. This may vary from the actual database
name, as multiple hosts might have databases with the same name. Multiple databases
can be added by separating the names with commas. Options that differ between the
databases should be separated by a matching commas. Example:

  bucardo add db alpha,beta dbname=sales host=aa,bb user=bucardo

This command will attempt an immediate test connection to the added database(s).
The supported named parameters are:

=over

=item C<dbname>

The actual name of the database. Required unless using a service file.

=item C<type>

The type of the database. Defaults to C<postgres>. Currently supported values are:

=over

=item * C<postgres>

=item * C<drizzle>

=item * C<mongo>

=item * C<mysql>

=item * C<maria>

=item * C<oracle>

=item * C<redis>

=item * C<sqlite>

=back

=item C<user>

The username Bucardo should use when connecting to this database.

=item C<pass>

The password Bucardo should use when connecting to this database. It is recommended
that you use a .pgpass file rather than entering the password here.

=item C<host>

The host Bucardo should use when connecting to this database. Defaults to the value of the C<$PGHOSTADDR>
or C<$PGHOST> environment variables, if present.

=item C<port>

The port Bucardo should use when connecting to this database. Defaults to the value of the C<$PGPORT>
environment variable, if present.

=item C<conn>

Additional connection parameters, e.g. C<sslmode=require>.

=item C<service>

The service name Bucardo should use when connecting to this database.

=item C<status>

Initial status of this database. Defaults to "active" but can be set to "inactive".

=item C<dbgroup>

Name of the database group this database should belong to.

=item C<addalltables>

Automatically add all tables from this database.

=item C<addallsequences>

Automatically add all sequences from this database.

=item C<server_side_prepares>

=item C<ssp>

Set to 1 or 0 to enable or disable server-side prepares. Defaults to 1.

=item C<makedelta>

Set to 1 or 0 to enable or disable makedelta. Defaults to 0.

=back

Additional parameters:

=over

=item C<--force>

Forces the database to be added without running a connection test.

=back

B<Note:> As a convenience, if the C<dbuser> value is its default value,
"bucardo", in the event that Bucardo cannot connect to the database, it will
try connecting as "postgres" and create a superuser named "bucardo". This is
to make things easier for folks getting started with Bucardo, but will not
work if it cannot connect as "postgres", or if it the connection failed due to
an authentication failure.

=head3 add dbgroup

  bucardo add dbgroup name db1:source db2:source db3:target ...

Adds one or more databases to the named dbgroup. If the dbgroup
doesn't exist, it will be created. The database parameters should specify
their roles, either "source" or "target".

=head3 add table

  bucardo add table [schema].table db=actual_db_name

Adds a table object. The table information will be read from the specified
database. Supported parameters:

=over

=item C<db>

The name of the database from which to read the table information. Should be a
name known to Bucardo, thanks to a previous call to C<add database>. Required.

=item C<autokick>

Boolean indicating whether or not the table should automatically send kick
messages when it's modified. Overrides the C<autokick> parameter of any syncs
of which the table is a part.

=item C<rebuild_index>

Boolean indicating whether or not to rebuild indexes after every sync. Off by
default. Optional.

=item C<analyze_after_copy>

Boolean indicating whether or not to analyze the table after every sync. Off
by default. Optional.

=item C<vacuum_after_copy>

Boolean indicating whether or not to vacuum the table after every sync. Off by
default. Optional.

=item C<relgroup>

Adds the table to the named relgroup. If the relgroup does not
exist, it will be created. Optional.

=item C<makedelta>

Turns makedelta magic on or off. Value is a list of databases which need makedelta
for this table. Value can also be "on" to enable makedelta for all databases.
Defaults to "off".

=item C<strict_check>

Boolean indicating whether or not to be strict when comparing the table
between syncs. If the columns have different names or data types, the
validation will fail. But perhaps the columns are allowed to have different
names or data types. If so, disable C<strict_check> and column differences will
result in warnings rather than failing the validation. Defaults to true.

=back

=head3 add sequence

  bucardo add sequence [schema].sequence relgroup=xxx

=over

=item C<db>

The name of the database from which to read the sequence information. Should
be a name known to Bucardo, thanks to a previous call to C<add database>.
Required.

=item C<relgroup>

Adds the sequence to the named relgroup. If the relgroup does not
exist, it will be created. Optional.

=back

=head3 add all tables

  bucardo add all tables [relgroup=xxx] [pkonly]

Adds all the tables in all known databases or in a specified database.
Excludes tables in the C<pg_catalog>, C<information_schema>, and C<bucardo>
schemas. (Yes, this means that you cannot replicate the Bucardo configuration
database using Bucardo. Sorry about that.) Supported options and parameters:

=over

=item C<db>

=item C<--db>

Name of the database from which to find all the tables to add. If not
provided, tables will be added from all known databases.

=item C<schema>

=item C<--schema>

=item C<-n>

Limit to the tables in the specified comma-delimited list of schemas. The
options may be specified more than once.

=item C<exclude-schema>

=item C<--exclude-schema>

=item C<-N>

Exclude tables in the specified comma-delimited list of schemas. The options
may be specified more than once.

=item C<table>

=item C<--table>

=item C<-t>

Limit to the specified tables. The options may be specified more than once.

=item C<exclude-table>

=item C<--exclude-table>

=item C<-T>

Exclude the specified tables. The options may be specified more than once.

=item C<relgroup>

=item C<--relgroup>

Name of the relgroup to which to add new tables.

=item C<pkonly>

Exclude tables without primary keys.

=back

=head3 add all sequences

  bucardo add all sequences relgroup=xxx

Adds all the sequences in all known databases or in a specified database.
Excludes sequences in the C<pg_catalog>, C<information_schema>, and C<bucardo>
schemas. (Yes, this means that you cannot replicate the Bucardo configuration
database using Bucardo. Sorry about that.) Supported options and parameters:

=over

=item C<db>

=item C<--db>

Name of the database from which to find all the sequences to add. If not
provided, sequences will be added from all known databases.

=item C<schema>

=item C<--schema>

=item C<-n>

Limit to the sequences in the specified comma-delimited list of schemas. The
options may be specified more than once.

=item C<exclude-schema>

=item C<--exclude-schema>

=item C<-N>

Exclude sequences in the specified comma-delimited list of schemas. The
options may be specified more than once.

=item C<relgroup>

=item C<--relgroup>

Name of the relgroup to which to add new tables or sequences.

=back

=head3 add relgroup

  bucardo add relgroup name
  bucardo add relgroup name table, sequence, ...

Adds a relgroup. After the name, pass in an optional list of tables
and/or sequences and they will be added to the group.

=head3 add sync

  bucardo add sync name relgroup=xxx dbs=xxx

Adds a sync, which is a named replication event containing information about
what to replicate from where to where. The supported parameters are:

=over

=item C<dbs>

The name of a dbgroup or comma-delimited list of databases. All of the
specified databases will be synchronized. Required.

=item C<dbgroup>

The name of a dbgroup. All of the databases within this group will be
part of the sync. If the dbgroup does not exists and a separate list
of databases is given, the group will be created and populated.

=item C<relgroup>

The name of a relgroup to synchronize. All of the tables and/or
sequences in the relgroup will be synchronized. Required unless C<tables> is
specified.

=item C<tables>

List of tables to add to the sync. This implicitly creates a relgroup
with the same name as the sync. Required unless C<relgroup> is specified.

=item C<status>

Indicates whether or not the sync is active. Must be either "active" or
"inactive". Defaults to "active".

=item C<rebuild_index>

Boolean indicating whether or not to rebuild indexes after every sync.
Defaults to off.

=item C<lifetime>

Number of seconds a KID can live before being reaped. No limit by default.

=item C<maxkicks>

Number of times a KID may be kicked before being reaped. No limit by default.

=item C<conflict_strategy>

The conflict resolution strategy to use in the sync. Supported values:

=over

=item C<bucardo_source>

The rows on the "source" database always "win". In other words, in a conflict,
Bucardo copies rows from source to target.

=item C<bucardo_target>

The rows on the "target" database always win.

=item C<bucardo_skip>

Any conflicting rows are simply not replicated. Not recommended for most
cases.

=item C<bucardo_random>

Each database has an equal chance of winning each time. This is the default.

=item C<bucardo_latest>

The row that was most recently changed wins.

=item C<bucardo_abort>

The sync is aborted on a conflict.

=back

=item C<onetimecopy>

Determines whether or not a sync should switch to a full copy mode for a
single run. Supported values are:

=over

=item 0: off

=item 1: always full copy

=item 2: only copy tables that are empty on the target

=back

=item C<stayalive>

Boolean indicating whether or not the sync processes (CTL) should be
persistent. Defaults to false.

=item C<kidsalive>

Boolean indicating whether or not the sync child processes (KID) should be
persistent. Defaults to false.

=item C<autokick>

Boolean indicating whether or not tables in the sync should automatically send
kick messages when they're modified. May be overridden by the C<autokick>
parameter of individual tables.

=item C<checktime>

An interval specifying the maximum time a sync should go before being
kicked. Useful for busy systems where you don't want the overhead of notify
triggers.

=item C<priority>

An integer indicating the priority of the sync. Lower numbers are higher
priority. Currently used only for display purposes.

=item C<analyze_after_copy>

Boolean indicating whether or not to analyze tables after every sync. Off by
default. Optional.

=item C<overdue>

An interval specifying the amount of time after which the sync has not run
that it should be considered overdue. C<check_bucardo_sync> issues a warning
when a sync has not been run in this amount of time.

=item C<expired>

An interval specifying the amount of time after which the sync has not run
that it should be considered expired. C<check_bucardo_sync> issues a critical
message when a sync has not been run in this amount of time.

=item C<track_rates>

Boolean indicating whether or not to track synchronization rates.

=item C<rebuild_index>

Boolean indicating whether or not to rebuild indexes after every sync. Off by
default. Optional.

=item C<strict_check>

Boolean indicating whether or not to be strict when comparing tables in the
sync. If the columns have different names or data types, the validation will
fail. But perhaps the columns are allowed to have different names or data
types. If so, disable C<strict_check> and column differences will result in
warnings rather than failing the validation. Defaults to true.

=back

=head3 add customname

  bucardo add customname oldname newname [db=name] [sync=name]

Creates a new Bucardo custom name mapping. This allows the tables involved in
replication to have different names on different databases. The C<oldname>
must contain the schema as well as the table name (if the source database
supports schemas). The optional parameters limit it to one or more databases,
and/or to one or more syncs. Supported parameters:

=over

=item C<sync>

A sync to which to add the customname. May be specified multiple times.

=item C<database>

=item C<db>

A database for which to add the customname. May be specified multiple times.

=back

=head3 add customcols

  bucardo add customcols tablename select_clause [sync=x db=x]

Specify the list of columns to select from when syncing. Rather than the
default C<SELECT *> behavior, you can specify any columns you want, including
the use of function call return values and things not in the source column
list. The optional parameters limit it to one or more databases, and/or to one
or more syncs. Some examples:

  bucardo add customcols public.foobar "select a, b, c"
  bucardo add customcols public.foobar "select a, upper(b) AS b, c" db=foo
  bucardo add customcols public.foobar "select a, b, c" db=foo sync=abc

Supported parameters:

=over

=item C<sync>

A sync to which to add the customcols. May be specified multiple times.

=item C<database>

=item C<db>

A database for which to add the customcols. May be specified multiple times.

=back

=head3 add customcode

  bucardo add customcode <name> <whenrun=value> <src_code=filename> [optional information]

Adds a customcode, which is a Perl subroutine that can be run at certain
points in the sync process. It might handle exceptions, handle conflicts, or
just run at certain times with no expectation of functionality (e.g., before
Bucardo drops triggers). Metadata about that point will be passed to the
subroutine as a hash reference.

Supported parameters:

=over

=item C<name>

The name of the custom code object.

=item C<about>

A short description of the custom code.

=item C<whenrun>

=item C<when_run>

A string indicating when the custom code should be run. Supported values
include:

=over

=item C<before_txn>

=item C<before_check_rows>

=item C<before_trigger_drop>

=item C<after_trigger_drop>

=item C<after_table_sync>

=item C<exception>

=item C<conflict>

=item C<before_trigger_enable>

=item C<after_trigger_enable>

=item C<after_txn>

=item C<before_sync>

=item C<after_sync>

=back

=item C<getdbh>

Boolean indicating whether or not Perl L<DBI> database handles should be
provided to the custom code subroutine. If true, database handles will be
provided under the C<dbh> key of the hash reference passed to the subroutine.
The value under this key will be a hash reference mapping database names to
their respective handles.

=item C<sync>

Name of the sync with which to associate the custom code.

=item C<relation>

Name of the table or sequence with which to associate the custom code.

=item C<status>

The current status of this customcode. Anything other than "active" means the
code is not run.

=item C<priority>

Number indicating the priority in which order to execute custom codes. Lower numbers
are higher priority. Useful for subroutines that set C<lastcode> in order to
cancel the execution of subsequent custom codes for the same C<when_run>.

=item C<src_code>

File from which to read the custom code Perl source.

=back

The body of the Perl subroutine should be implemented in the C<src_code> file,
and not inside a C<sub> declaration. When called, it will be passed a single
hash reference with the following keys:

=over

=item C<syncname>

The name of the currently-executing sync.

=item C<version>

The version of Bucardo executing the sync.

=item C<sourcename>

The name of the source database.

=item C<targetname>

The name of the target database.

=item C<sendmail>

A code reference that can be used to send email messages.

=item C<sourcedbh>

A L<DBI> database handle to the sync source database. Provided only to custom
code executed by the controller.

=item C<rellist>

An array reference of hash references, each representing a relation in the
sync. Provided only to custom code executed by the controller. The keys in
the hash are the same as the parameters supported by L</add table> and
L</add sequence>, as appropriate.

=item C<schemaname>

The schema for the table that triggered the exception. Provided only to
"exception" custom codes.

=item C<tablename>

The name of the table that triggered the exception. Provided only to
"exception" custom codes.

=item C<error_string>

The string containing the actual error message. Provided only to "exception"
custom codes.

=item C<deltabin>

A hash reference with the name of each source database as a key and a list of
all primary keys joined together with "\0". Provided only to "exception"
custom codes.

=item C<attempts>

The number of times the sync has been attempted. Provided only to "exception"
custom codes.

=item C<conflicts>

A hash reference of conflicting rows. The keys are the primary key values, and
the values are hash references with the names of the databases containing the
conflicting rows and true values. Provided only to "conflict" custom codes.

=back

The custom code subroutine may set any of these keys in the hash reference to
change the behavior of the sync:

=over

=item C<message>

Message to send to the logs.

=item C<warning>

A warning to emit after the subroutine has returned.

=item C<error>

An error to be thrown after the subroutine has returned.

=item C<nextcode>

Set to send execution to the next custom code of the same type. Mainly useful
to exception custom codes, and supported only by custom codes executed by the
controller.

=item C<lastcode>

Set to true to have any subsequent custom codes of the same type to be
skipped.

=item C<endsync>

Cancels the sync altogether.

=back

An example:

  use strict;
  use warnings;
  use Data::Dumper;

  my $info = shift;

  # Let's open a file.
  my $file = '/tmp/bucardo_dump.txt';
  open my $fh, '>:encoding(UTF-8)', $file or do {
      $info->{warning} = "Cannot open $file: $!\n";
      return;
  };

  # Inspect $info for fun.
  print $fh Dumper $info;
  close $fh or $info->{warning} = "Error closing $file: $!\n";

  # Log a message and return.
  $info->{message} = 'IN UR DATABASEZ NORMALIZIN UR RELAYSHUNS';
  return;

=head2 update

  bucardo update <type> <name> <parameters>

Updates a Bucardo object. The C<type> specifies the type of object to update,
while the C<name> should be the name of the object. The supported parameters
for each type are the same as those for L</add>. The supported types are:

=over

=item C<customcode>

=item C<db>

=item C<sync>

=item C<table>

=item C<sequence>

=back

=head3 update customcode

  bucardo update customcode <name> setting=value

Updates an existing customcode. Items that can be changed are:

=over

=item C<about>

A short description of the custom code.

=item C<getdbh>

Boolean indicating whether or not Perl L<DBI> database handles should be
provided to the custom code subroutine. If true, database handles will be
provided under the C<dbh> key of the hash reference passed to the subroutine.
The value under this key will be a hash reference mapping database names to
their respective handles.

=item C<name>

The name of the custom code object.

=item C<priority>

Number indicating the priority in which order to execute custom codes. Lower numbers
are higher priority. Useful for subroutines that set C<lastcode> in order to
cancel the execution of subsequent custom codes for the same C<when_run>.

=item C<status>

The current status of this customcode. Anything other than "active" means the
code is not run.

=item C<whenrun>

A string indicating when the custom code should be run. Supported values include:

=over

=item C<before_txn>

=item C<before_check_rows>

=item C<before_trigger_drop>

=item C<after_trigger_drop>

=item C<after_table_sync>

=item C<exception>

=item C<conflict>

=item C<before_trigger_enable>

=item C<after_trigger_enable>

=item C<after_txn>

=item C<before_sync>

=item C<after_sync>

=back

=back

=head3 update db

  bucardo udpate db <name> port=xxx host=xxx user=xxx pass=xxx

Updates a database. The C<name> is the name by which the database is known to
Bucardo. This may vary from the actual database name, as multiple hosts might
have databases with the same name.

The supported named parameters are:

=over

=item C<dbname>

=item C<db>

The actual name of the database.

=item C<type>

=item C<dbtype>

The type of the database. Currently supported values are:

=over

=item * C<postgres>

=item * C<drizzle>

=item * C<mongo>

=item * C<mysql>

=item * C<maria>

=item * C<oracle>

=item * C<redis>

=item * C<sqlite>

=back

=item C<username>

=item C<dbuser>

=item C<user>

The username Bucardo should use to connect to the database.

=item C<password>

=item C<dbpass>

=item C<pass>

The password Bucardo should use when connecting to the database.

=item C<dbhost>

=item C<pghost>

=item C<host>

The host name to which to connect.

=item C<dbport>

=item C<pgport>

=item C<port>

The port to which to connect.

=item C<dbconn>

=item C<pgconn>

=item C<conn>

Additional connection parameters, e.g., C<sslmode=require>. Optional.

=item C<status>

Status of the database in Bucardo. Must be either "active" or "inactive".

=item C<dbgroup>

=item C<server_side_prepares>

=item C<ssp>

Enable or disable server-side prepares. Pass 1 to enable them or 0 to disable
them.

=item C<makedelta>

Enable or disable makedelta for this database.

=item C<dbservice>

=item C<service>

The service name to use for a Postgres database.

=item C<dbgroup>

A comma-separated list of dbgroups to which to add the database. The
database will be removed from any other dbgroups of which it was previously a
member.

=back

=head3 update sync

  bucardo update sync syncname relgroup=xxx dbs=xxx

Updates a sync, which is a named replication event containing information about
what to replicate from where to where. The supported parameters are:

=over

=item C<name>

The name of the sync. Required.

=item C<dbs>

The name of a dbgroup or comma-delimited list of databases.

=item C<relgroup>

The name of a relgroup to synchronize.

=item C<status>

Indicates whether or not the sync is active. Must be either "active" or
"inactive". Note that this will not change the current run status of the sync,
just mark whether it should be active or inactive on the next reload. Use the
C<activate sync> and <deactivate sync> commands to actually activate or
deactivate a sync.

=item C<rebuild_index>

Boolean indicating whether or not to rebuild indexes after every sync.

=item C<lifetime>

Number of seconds a KID can live before being reaped.

=item C<maxkicks>

Number of times a KID may be kicked before being reaped.

=item C<isolation_level>

The transaction isolation level this sync should use.
Only choices are "serializable" and "repeatable read"

=item C<conflict_strategy>

The conflict resolution strategy to use in the sync. Supported values:

=over

=item C<bucardo_source>

The rows on the "source" database always "win". In other words, in a conflict,
Bucardo copies rows from source to target.

=item C<bucardo_target>

The rows on the "target" database always win.

=item C<bucardo_skip>

Any conflicting rows are simply not replicated. Not recommended for most
cases.

=item C<bucardo_random>

Each database has an equal chance of winning each time.

=item C<bucardo_latest>

The row that was most recently changed wins.

=item C<bucardo_abort>

The sync is aborted on a conflict.

=back

=item C<onetimecopy>

Determines whether or not a sync should switch to a full copy mode for a
single run. Supported values are:

=over

=item 0: off

=item 1: always full copy

=item 2: only copy tables that are empty on the target

=back

=item C<stayalive>

Boolean indicating whether or not the sync processes (CTL) should be
persistent.

=item C<kidsalive>

Boolean indicating whether or not the sync child processes (KID) should be
persistent.

=item C<autokick>

Boolean indicating whether or not tables in the sync should automatically send
kick messages when they're modified. May be overridden by the C<autokick>
parameter of individual tables.

=item C<checktime>

An interval specifying the maximum time a sync should go before being
kicked. Useful for busy systems where you don't want the overhead of notify
triggers.

=item C<priority>

An integer indicating the priority of the sync. Lower numbers are higher
priority. Currently used only for display purposes.

=item C<analyze_after_copy>

Boolean indicating whether or not to analyze tables after every sync. Off by
default.

=item C<overdue>

An interval specifying the amount of time after which the sync has not run
that it should be considered overdue. C<check_bucardo_sync> issues a warning
when a sync has not been run in this amount of time.

=item C<expired>

An interval specifying the amount of time after which the sync has not run
that it should be considered expired. C<check_bucardo_sync> issues a critical
message when a sync has not been run in this amount of time.

=item C<track_rates>

Boolean indicating whether or not to track synchronization rates.

=item C<rebuild_index>

Boolean indicating whether or not to rebuild indexes after every sync.

=item C<strict_check>

Boolean indicating whether or not to be strict when comparing tables in the
sync. If the columns have different names or data types, the validation will
fail. But perhaps the columns are allowed to have different names or data
types. If so, disable C<strict_check> and column differences will result in
warnings rather than failing the validation. Defaults to true.

=back

=head3 update table

  bucardo update table [schema].table db=actual_db_name

Updates a table object. The table information will be read from the specified
database. Supported parameters:

=over

=item C<db>

The name of the database from which to read the table information. Should be a
name known to Bucardo.

=item C<schemaname>

The name of the schema in which the table is found.

=item C<tablename>

The actual name of the table.

=item C<autokick>

Boolean indicating whether or not the table should automatically send kick
messages when it's modified. Overrides the C<autokick> parameter of any syncs
of which the table is a part.

=item C<rebuild_index>

Boolean indicating whether or not to rebuild indexes after every sync.

=item C<analyze_after_copy>

Boolean indicating whether or not to analyze the table after every sync.

=item C<vacuum_after_copy>

Boolean indicating whether or not to vacuum the table after every sync.

=item C<relgroup>

Adds the table to the named relgroup. May be specified more than once.
The table will be removed from any other relgroups.

=item C<makedelta>

Specifies which databases need makedelta enabled for this table.

=item C<strict_check>

Boolean indicating whether or not to be strict when comparing the table
between syncs. If the columns have different names or data types, the
validation will fail. But perhaps the columns are allowed to have different
names or data types. If so, disable C<strict_check> and column differences will
result in warnings rather than failing the validation. Defaults to true.

=back

=head3 update sequence

  bucardo update sequence [schema].sequence relgroup=xxx

=over

=item C<db>

The name of the database where the sequence lives.

=item C<schemaname>

The name of the schema in which the sequence is found.

=item C<relgroup>

Adds the sequence to the named relgroup. May be speci<fied more than
once. The sequence will be removed from any other relgroups.

=back

=head2 remove

  bucardo remove <item_type> <item_name>

Removes one or more objects from Bucardo. Valid item types are;

=over

=item * C<db> or C<database>

Use the C<--force> option to clear out related tables and groups instead of
erroring out.

=item * C<dbgroup>

=item * C<relgroup>

=item * C<sync>

=item * C<table>

=item * C<sequence>

=item * C<customcols>

=item * C<customname>

=item * C<customcode>

=back

=head2 kick

  bucardo kick <syncname(s)> [timeout]

Tells one or more named syncs to fire as soon as possible. Note that this simply sends a request that
the sync fire: it may not start right away if the same sync is already running, or if the source or
target database has exceeded the number of allowed Bucardo connections. If the final argument is a
number, it is treated as a timeout. If this number is zero, the bucardo command will not return
until the sync has finished. For any other number, the sync will wait at most that number of seconds.
If any sync has not finished before the timeout, an exit value of 1 will be returned. Errors will
cause exit values of 2 or 3. In all other cases, an exit value of 0 will be returned.

If a timeout is given, the total completion time in seconds is also displayed. If the sync is going to
multiple targets, the time that each target takes from the start of the kick is also shown as each
target finishes. Options:

=over

=item C<--retry>

The number of times to retry a sync if it fails. Defaults to 0.

=item C<--retry-sleep>

How long to sleep, in seconds, between each retry attempt.

=item C<--notimer>

By default, kicks with a timeout argument give a running real-time summary of
time elapsed by using the backspace character. This may not be wanted if
running a kick, for example, via a cronjob, so turning --notimer on will
simply print the entire message without backspaces.

=back

=head2 pause

  bucardo pause <syncname(s)>
  bucardo pause all
  bucardo resume <syncname(s)>
  bucardo resume all

Tells one or more named syncs to temporarily pause, or to resume from a previous pause. This
only applies to active syncs and only takes effect if Bucardo is currently running. The
keyword 'all' can be used as well to pause or resume all known active syncs.

=head2 reload config

  bucardo reload config
  bucardo reload config 30

Sends a message to all CTL and KID processes asking them to reload the Bucardo
configuration. This configuration is a series of key/value pairs that
configure Bucardo's behavior, and not any of the objects managed by the
C<add>, C<remove>, or C<update> commands.

By default, Bucardo will send the message and then exit. Pass an optional
number and Bucardo will instead wait up to that length of time for all child
processes to report completion.

=head2 set

  bucardo set setting1=value [setting2=value]

Sets one or more configuration setting table. Setting names are
case-insensitive. The available settings are:

=begin comment

How to generate this list:

  psql -U bucardo -d bucardo -AXtc "SELECT regexp_replace(format(
      E'=item C<%s>\n\n%s. Default: %s.\n',
      name, about, CASE WHEN setting = '' THEN 'None' ELSE 'C<' || setting || '>' END
  ), '([.?])[.]', E'\\\\1') FROM bucardo_config ORDER BY name;"

=end comment

=over

=item C<autosync_ddl>

Which DDL changing conditions do we try to remedy automatically? Default: C<newcol>.

=item C<bucardo_version>

Current version of Bucardo. Default: C<5.4.1>.

=item C<bucardo_vac>

Do we want the automatic VAC daemon to run? Default: C<1>.

=item C<bucardo_initial_version>

Bucardo version this schema was created with. Default: C<5.4.1>.

=item C<ctl_checkonkids_time>

How often does the controller check on the kids health? Default: C<10>.

=item C<ctl_createkid_time>

How long do we sleep to allow kids-on-demand to get on their feet? Default: C<0.5>.

=item C<ctl_sleep>

How long does the controller loop sleep? Default: C<0.2>.

=item C<default_conflict_strategy>

Default conflict strategy for all syncs. Default: C<bucardo_latest>.

=item C<default_email_from>

Who the alert emails are sent as. Default: C<nobody@example.com>.

=item C<default_email_host>

Which host to send email through. Default: C<localhost>.

=item C<default_email_to>

Who to send alert emails to. Default: C<nobody@example.com>.

=item C<email_debug_file>

File to save a copy of all outgoing emails to. Default: None.

=item C<endsync_sleep>

How long do we sleep when custom code requests an endsync? Default: C<1.0>.

=item C<flatfile_dir>

Directory to store the flatfile output inside of. Default: C<.>.

=item C<host_safety_check>

Regex to make sure we don't accidentally run where we should not. Default: None.

=item C<isolation_level>

The transaction isolation level all sync should use. Defaults to 'serializable'.
The only other valid option is 'repeatable read'

=item C<kid_deadlock_sleep>

How long to sleep in seconds if we hit a deadlock error. Default: C<0.5>.
Set to -1 to prevent the kid from retrying.

=item C<kid_nodeltarows_sleep>

How long do kids sleep if no delta rows are found? Default: C<0.5>.

=item C<kid_pingtime>

How often do we ping check the KID? Default: C<60>.

=item C<kid_restart_sleep>

How long to sleep in seconds when restarting a kid? Default: C<1>.

=item C<kid_serial_sleep>

How long to sleep in seconds if we hit a serialization error. Default: C<0.5>.
Set to -1 to prevent the kid from retrying.

=item C<kid_sleep>

How long does a kid loop sleep? Default: C<0.5>.

=item C<log_conflict_file>

Name of the conflict detail log file. Default: C<bucardo_conflict.log>.

=item C<log_level>

How verbose to make the logging. Higher is more verbose. Default: C<normal>.

=item C<log_microsecond>

Show microsecond output in the timestamps? Default: C<0>.

=item C<log_showlevel>

Show log level in the log output? Default: C<0>.

=item C<log_showline>

Show line number in the log output? Default: C<0>.

=item C<log_showpid>

Show PID in the log output? Default: C<1>.

=item C<log_showtime>

Show timestamp in the log output?  0=off  1=seconds since epoch  2=scalar gmtime  3=scalar localtime. Default: C<3>.

=item C<mcp_dbproblem_sleep>

How many seconds to sleep before trying to respawn. Default: C<15>.

=item C<mcp_loop_sleep>

How long does the main MCP daemon sleep between loops? Default: C<0.2>.

=item C<mcp_pingtime>

How often do we ping check the MCP? Default: C<60>.

=item C<mcp_vactime>

How often in seconds do we check that a VAC is still running? Default: C<60>.

=item C<piddir>

Directory holding Bucardo PID files. Default: C</var/run/bucardo>.

=item C<reason_file>

File to hold reasons for stopping and starting. Default: C<bucardo.restart.reason.txt>.

=item C<reload_config_timeout>

Number of seconds the C<reload_config> command should wait for the reload to complete.
Default: C<30>.

=item C<semaphore_table>

Table to let apps know a sync is ongoing. Default: C<bucardo_status>.

=item C<statement_chunk_size>

How many primary keys to shove into a single statement. Default: C<10000>.

=item C<stats_script_url>

Location of the stats script. Default: C<http://www.bucardo.org/>.

=item C<stopfile>

Name of the semaphore file used to stop Bucardo processes. Default: C<fullstopbucardo>.

=item C<syslog_facility>

Which syslog facility level to use. Default: C<log_local1>.

=item C<tcp_keepalives_count>

How many probes to send. 0 indicates sticking with system defaults. Default: C<0>.

=item C<tcp_keepalives_idle>

How long to wait between each keepalive probe. Default: C<0>.

=item C<tcp_keepalives_interval>

How long to wait for a response to a keepalive probe. Default: C<0>.

=item C<vac_run>

How often does the VAC process run? Default: C<30>.

=item C<vac_sleep>

How long does VAC process sleep between runs? Default: C<120>.

=item C<warning_file>

File containing all log lines starting with "Warning". Default: C<bucardo.warning.log>.

=back

=head2 show

  bucardo show all|<setting> [<setting>...]

Shows the current Bucardo settings. Use the keyword "all" to see all the
settings, or specify one or more search terms. See L</set> for complete
details on the configuration settings.

=head2 config

  bucardo config show all|<setting> [<setting>...]
  bucardo config set <setting=value> [<setting=value>...]

Deprecated interface for showing and setting configuration settings. Use the
L</show> and L</set> commands, instead.

=head2 ping

  bucardo ping
  bucardo ping 60
  bucardo ping 0

Sends a ping notice to the MCP process to see if it will respond. By default, it will wait 15 seconds. A
numeric argument will change this timeout. Using a 0 as the timeout indicates waiting forever. If a response
was returned, the program will exit with a value of 0. If it times out, the value will be 1.
Returns a Nagios like message starting with "OK" or "CRITICAL" for success or failure.

=head2 status

  bucardo status [syncname(s)] [--sort=#] [--show-days] [--compress]

Shows the brief status of all known syncs in a tabular format. If given one or more sync names,
shows detailed information for each one. To see detailed information for all syncs, simply
use "status all"

When showing brief information, the columns are:

=over

=item 1. B<Name>

The name of the sync

=item 2. B<State>

The state of the sync. Can be 'Good', 'Bad', 'Empty', 'No records found',
'Unknown', or the run state for a currently-running sync.

=item 3. B<Last good>

When the sync last successfully ran.

=item 4. B<Time>

How long it has been since the last sync success

=item 5. B<Last I/U>

The number of insert and deletes performed by the last successful sync. May also show
the number of rows truncated (T) or conflicted (C), if applicable.

=item 6. B<Last bad>

When the sync last failed.

=item 7. B<Time>

How long it has been since the last sync failure

=back

The options for C<status> are:

=over

=item C<--show-days>

Specifies whether or not do list the time interval with days, or simply show
the hours. For example, "3d 12h 6m 3s" vs. "48h 6m 3s"

=item C<--compress>

Specifies whether or not to compress the time interval by removing spaces.
Mostly used to limit the width of the 'status' display.

=item C<--sort=#>

Requests sorting of the 'status' output by one of the nine columns. Use a
negative number to reverse the sort order.

=back

=head2 activate

  bucardo activate syncname [syncname2 syncname3 ...] [timeout]

Activates one or more named syncs. If given a timeout argument, it will wait until it has received
confirmation from Bucardo that each sync has been successfully activated.

=head2 deactivate

  bucardo deactivate syncname [syncname2 syncname3 ...] [timeout]

Deactivates one or more named syncs. If given a timeout argument, it will wait until it has received
confirmation from Bucardo that the sync has been successfully deactivated.

=head2 message

  bucardo message 'I WAS HERE'

Sends a message to the running Bucardo logs. This message will appear prefixed with "MESSAGE: ". If
Bucardo is not running, the message will go to the logs the next time Bucardo runs and someone
adds another message.

=head2 reload

  bucardo reload [syncname2 syncname3 ...]

Sends a message to one or more sync processes, instructing them to reload.
Waits for each to reload before going on to the next. Reloading consists of
deactivating a sync, reloading its information from the database, and
activating it again.

=head2 inspect

  bucardo inspect <type> <name> [<name2>...]

Inspects one or more objects of a particular type. The results are sent to
C<STDOUT>. The supported types include:

=over

=item C<table>

=item C<sync>

=item C<relgroup>

=back

=head2 validate

  bucardo validate all|<sync> [<sync>...]

Validates one or more syncs. Use the keyword "all" to validate all syncs, or
specify one or more syncs to validate.

Note that this command executes a subset of all the validation done when a
sync is started or activated.

=head2 purge

  bucardo purge all|<table> [<table>...]

Purges the delta and track tables for one or more tables, for one or more
databases. Use the keyword "all" to validate all tables, or specify one or
more tables to validate.

=head2 delta

  bucardo delta [total] [<database>...]

Show the current delta count for each source target. Provide a list of databases
to limit it to just the given ones. Wildcards are allowed. Use the special name
"totals" to show only the grand total.

=head2 help

  bucardo help
  bucardo help <command>
  bucardo help <command> <action>

Get help. General help can be returned, as well as help for a single command
or a command and its action. Some examples:

  bucard help list
  bucard help add table

=head1 OPTIONS DETAILS

It is usually easier to set most of these options at the top of the script, or make an alias for them,
as they will not change very often if at all.

=over

=item C<-d>

=item C<--db-name>

  bucardo --db-name widgets
  bucardo -d bricolage

Name of the Bucardo database to which to connect.

=item C<-U>

=item C<--db-user>

  bucardo --db-user postgres
  bucardo -U Mom

User name to use when connecting to the Bucardo database.

=item C<-P>

=item C<--db-pass>

  bucardo --db-pass s3cr1t
  bucardo -P lolz

Password to use when connecting to the Bucardo database.

=item C<-h>

=item C<--db-host>

  bucardo --db-host db.example.com
  bucardo -h db2.example.net

Host name to use when connecting to the Bucardo database.

=item C<-p>

=item C<--db-port>

  bucardo --db-port 7654

Port number to connect to when connecting to the Bucardo database.

=item C<--bucardorc>

  bucardo --bucardorc myrcfile

Use the specified file for configuration instead of the default
F<./.bucardorc>.

=item C<--no-bucardorc>

Do not use the F<./.bucardorc> configuration file.

=item C<--verbose>

Makes bucardo run verbosely. Default is off.

=item C<--quiet>

Tells bucardo to be as quiet as possible. Default is off.

=item C<--help>

Shows a brief summary of usage for bucardo.

=back

=head1 FILES

In addition to command-line configurations, you can put any options inside of a file. The file F<.bucardorc> in
the current directory will be used if found. If not found, then the file F<~/.bucardorc> will be used. Finally,
the file /etc/bucardorc will be used if available. The format of the file is option = value, one per line. Any
line starting with a '#' will be skipped. Any values loaded from a bucardorc file will be overwritten by
command-line options. All bucardorc files can be ignored by supplying a C<--no-bucardorc> argument. A specific
file can be forced with the C<--bucardorc=file> option; if this option is set, bucardo will refuse to run
unless that file can be read.

=head1 ENVIRONMENT VARIABLES

The bucardo script uses I<$ENV{HOME}> to look for a F<.bucardorc> file.

=head1 BUGS

Bug reports and feature requests are always welcome, please visit
L<bucardo.org|http://bucardo.org>, file L<GitHub
Issues|http://github.com/bucardo/bucardo/issues>, or post to our
L<email list|https://mail.endcrypt.com/mailman/listinfo/bucardo-general>.

=head1 SEE ALSO

Bucardo

=head1 COPYRIGHT

Copyright 2006-2015 Greg Sabino Mullane <greg@endpoint.com>

This program is free to use, subject to the limitations in the LICENSE file.

=cut
