#! /bin/sh
. /usr/lib/news/lib/innshellvars

# @(#) $Id: actmerge.in,v 1.2 1999/11/15 06:28:26 rra Exp $
# @(#) Under RCS control in /usr/local/news/src/inn/local/RCS/actmerge.sh,v
#
# actmerge - merge two active files
#
# usage:
#	actmerge [-s] ign1 ign2 host1 host2 
#
#	-s	- write status on stderr even if no fatal error
#	ign1	- ignore file for host1
#	ign2	- ignore file for host2
#	host1	- 1st active file or host
#	host2	- 2nd active file or host
#
# The merge of two active files are sent to stdout.  The status is
# written to stderr.

# By: Landon Curt Noll  	chongo@toad.com		(chongo was here /\../\)
#
# Copyright (c) Landon Curt Noll, 1996.
# All rights reserved.
#
# Permission to use and modify is hereby granted so long as this 
# notice remains.  Use at your own risk.  No warranty is implied.

# preset vars
#

# Our lock file
LOCK=${LOCKS}/LOCK.actmerge
# where actsync is located
ACTSYNC=${PATHBIN}/actsync
# exit value of actsync if unable to get an active file
NOSYNC=127
# args used by actsync a fetch of an active file
FETCH="-b 0 -d 0 -g 0 -o aK -p 0 -q 12 -s 0 -t 0 -v 2"
# args used to merge two active files
MERGE="-b 0 -d 0 -g 0 -m -o aK -p 0 -q 12 -s 0 -t 0 -v 3"
# unless -q
QUIET=true

# parse args
#
if [ $# -gt 1 ]; then
    if [ X"-s" = X"$1" ]; then
	QUIET=
	shift
    fi
fi
if [ $# -ne 4 ]; then
    echo "usage: $0 ign1 ign2 host1 host2" 1>&2
    exit 1
fi
ign1="$1"
if [ ! -s "$ign1" ]; then
    echo "$0: host1 ignore file not found or empty: $ign1" 1>&2
    exit 2
fi
ign2="$2"
if [ ! -s "$ign2" ]; then
    echo "$0: host2 ignore file not found or empty: $ign2" 1>&2
    exit 3
fi
host1="$3"
host2="$4"


# Lock out others
#
trap 'rm -f ${LOCK}; exit 1' 0 1 2 3 15
shlock -p $$ -f ${LOCK} || {
    echo "$0: Locked by `cat ${LOCK}`" 1>&2
    exit 4
}

# setup
#
tmp="$TMPDIR/.merge$$"
act1="$TMPDIR/.act1$$"
act2="$TMPDIR/.act2$$"
trap "rm -f $tmp ${LOCK} $act1 $act2; exit" 0 1 2 3 15
rm -f "$tmp"
touch "$tmp"
chmod 0600 "$tmp"
rm -f "$act1"
touch "$act1"
chmod 0600 "$act1"
rm -f "$act2"
touch "$act2"
chmod 0600 "$act2"

# try to fetch the first active file
#
echo "=-= fetching $host1" >>$tmp
eval "$ACTSYNC -i $ign1 $FETCH /dev/null $host1 > $act1 2>>$tmp"
status=$?
if [ "$status" -ne 0 ]; then

    # We failed on our first try, so we will trice knock 3 times after
    # waiting 5 minutes.
    #
    for loop in 1 2 3; do

	# wait 5 minutes
	sleep 300

	# try #1
	eval "$ACTSYNC -i $ign1 $FETCH /dev/null $host1 > $act1 2>>$tmp"
	status=$?
	if [ "$status" -eq "$NOSYNC" ]; then
	    break;
	fi

	# try #2
	eval "$ACTSYNC -i $ign1 $FETCH /dev/null $host1 > $act1 2>>$tmp"
	status=$?
	if [ "$status" -eq "$NOSYNC" ]; then
	    break;
	fi

	# try #3
	eval "$ACTSYNC -i $ign1 $FETCH /dev/null $host1 > $act1 2>>$tmp"
	status=$?
	if [ "$status" -eq "$NOSYNC" ]; then
	    break;
	fi
    done

    # give up
    #
    if [ "$status" -ne 0 ]; then
	echo "=-= `date` merge $host1 $host2 exit $status" 1>&2
	sed -e 's/^/    /' < "$tmp" 1>&2
	exit "$status"
    fi
fi
if [ ! -s "$act1" ]; then
    echo "$0: host1 active file not found or empty: $act1" 1>&2
    exit 5
fi

# try to fetch the second active file
#
echo "=-= fetching $host2" >>$tmp
eval "$ACTSYNC -i $ign2 $FETCH /dev/null $host2 > $act2 2>>$tmp"
status=$?
if [ "$status" -ne 0 ]; then

    # We failed on our first try, so we will trice knock 3 times after
    # waiting 5 minutes.
    #
    for loop in 1 2 3; do

	# wait 5 minutes
	sleep 300

	# try #1
	eval "$ACTSYNC -i $ign2 $FETCH /dev/null $host2 > $act2 2>>$tmp"
	status=$?
	if [ "$status" -eq "$NOSYNC" ]; then
	    break;
	fi

	# try #2
	eval "$ACTSYNC -i $ign2 $FETCH /dev/null $host2 > $act2 2>>$tmp"
	status=$?
	if [ "$status" -eq "$NOSYNC" ]; then
	    break;
	fi

	# try #3
	eval "$ACTSYNC -i $ign2 $FETCH /dev/null $host2 > $act2 2>>$tmp"
	status=$?
	if [ "$status" -eq "$NOSYNC" ]; then
	    break;
	fi
    done

    # give up
    #
    if [ "$status" -ne 0 ]; then
	echo "=-= `date` merge $host1 $host2 exit $status" 1>&2
	sed -e 's/^/    /' < "$tmp" 1>&2
	exit "$status"
    fi
fi
if [ ! -s "$act2" ]; then
    echo "$0: host2 active file not found or empty: $act2" 1>&2
    exit 6
fi

# merge the 2 active files to stdout
#
echo "=-= merging $host1 and $host2" >>$tmp
eval "$ACTSYNC $MERGE $act1 $act2" 2>>$tmp
status=$?
if [ "$status" -ne 0 ]; then
    echo "=-= `date` merge $host1 $host2 exit $status" 1>&2
    sed -e 's/^/    /' < "$tmp" 1>&2
    exit "$status"
fi

# if not -q, send status to stderr
#
if [ -z "$QUIET" ]; then
    echo "=-= `date` merge $host1 $host2 successful" 1>&2
    sed -e 's/^/    /' < "$tmp" 1>&2
fi

# all done
#
rm -f "${LOCK}"
exit 0
