#!/bin/sh
#
# chkconfig: 345 99 01
# description: Icinga network monitor
### BEGIN INIT INFO
# Provides:          icinga
# Required-Start:    $local_fs $remote_fs $syslog $named $network $time
# Required-Stop:     $local_fs $remote_fs $syslog $named $network
# Should-Start:
# Should-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: start and stop Icinga monitoring daemon
# Description:       Icinga is a service monitoring system
### END INIT INFO

## definitions ##
prefix=@prefix@
exec_prefix=@exec_prefix@
IcingaBin=@bindir@/icinga
IcingaCfgFile=@sysconfdir@/icinga.cfg
IcingaCommandFile=@EXTCMDFILEDIR@/icinga.cmd
IcingaRunFile=@lockfile@
IcingaLockDir=/var/lock/subsys
IcingaLockFile=icinga
IcingaUser=@icinga_user@
IcingaGroup=@icinga_grp@
IcingaChkFile=@ICINGACHKFILE@
IcingaPrecacheFallback=0

# load extra environment variables
if [ -f /etc/sysconfig/icinga ]; then
	. /etc/sysconfig/icinga
fi
if [ -f /etc/default/icinga ]; then
	. /etc/default/icinga
fi


# Source function library
# Solaris doesn't have an rc.d directory, so do a test first
if [ -f /etc/rc.d/init.d/functions ]; then
	. /etc/rc.d/init.d/functions
elif [ -f /etc/init.d/functions ]; then
	. /etc/init.d/functions
fi

# Check that icinga exists.
if [ ! -f $IcingaBin ]; then
	echo "Executable file $IcingaBin not found.  Exiting."
	exit 1
fi

# Check that icinga.cfg exists.
if [ ! -f $IcingaCfgFile ]; then
	echo "Configuration file $IcingaCfgFile not found.  Exiting."
	exit 1
fi

## helper functions ##

# check status if icinga daemon
# return 0 if running
# return 1 if dead but pidfile exists
# return 3 if daemon is not running
# return 4 if the state is unknown
status_icinga ()
{
	if pid_icinga && process_icinga; then
		return 0
	elif ! pid_icinga && ! process_icinga; then
		return 3
	elif pid_icinga; then
		return 1
	else
		return 4
	fi
}

# print human readable output of service status
printstatus_icinga()
{
	status_icinga
	STATUS=$?
	if test $STATUS -eq 0; then
		echo "Icinga (pid $IcingaPID) is running..."
	elif test $STATUS -eq 1; then
		echo "Icinga is not running but subsystem locked"
	else
		echo "Icinga is not running"
	fi
	exit $STATUS
}

# check if process is running
process_icinga ()
{
	if ps -p $IcingaPID > /dev/null 2>&1; then
		return 0
	else
		return 1
	fi
}

# check pidfile for existence
pid_icinga ()
{
	if test -f $IcingaRunFile; then
		IcingaPID=`head -n 1 $IcingaRunFile`
		return 0
	else
		return 1
	fi
}

# send HUP signal
reload_icinga ()
{
	kill -1 $IcingaPID
}

# send TERM signal
killproc_icinga ()
{
	kill $IcingaPID
}

# send KILL signal
killproc9_icinga ()
{
	kill -9 $IcingaPID

}

remove_run_files ()
{
	rm -f $IcingaStatusFile $IcingaRunFile $IcingaLockDir/$IcingaLockFile $IcingaCommandFile
}

chk_config ()
{
	printf "Running configuration check..."

	if test "x$2" = "xprecache"; then
		$IcingaBin -v -p $IcingaCfgFile > $IcingaChkFile 2>&1
	else
		$IcingaBin -v $IcingaCfgFile > $IcingaChkFile 2>&1
	fi

	if test $? -ne 0; then
		if test -z "$1"; then
			cat $IcingaChkFile
			echo "Result saved to $IcingaChkFile"
		else
			echo $1
		fi
		return 1
	fi
	rm -f $IcingaChkFile
	echo "OK"
	return 0
}

start(){
	# Check if icinga is already running
	status_icinga
	STATUS=$?
	if test $STATUS -eq 0; then
		echo "Icinga is already running. PID: $IcingaPID"
		exit 0
	elif test $STATUS -eq 1; then
		echo "Icinga with PID $IcingaPID not running. Removing lockfile."
		remove_run_files
	fi

	printf "Starting icinga: "
	rm -f $IcingaCommandFile

	# precreate runfile and handover it to icinga runuser and group
	touch $IcingaRunFile
	chown $IcingaUser:$IcingaGroup $IcingaRunFile

	# start icinga daemon
	if test "x$1" = "xprecache"; then
		$IcingaBin -d -u $IcingaCfgFile
		bin_exit=$?
	else
		$IcingaBin -d $IcingaCfgFile
		bin_exit=$?
	fi
	if [ -d $IcingaLockDir ]; then touch $IcingaLockDir/$IcingaLockFile; fi
	echo "Starting icinga done."
	exit $bin_exit
}


## MAIN ##
# See how we were called.
case "$1" in

	start)
		if test $IcingaPrecacheFallback != 1; then
			chk_config "CONFIG ERROR!  Start aborted. See $IcingaChkFile for details."

			if test $? != 0; then
				exit 6
			fi

			start
		else
			IcingaPrecacheFile=`grep '^precached_object_file' $IcingaCfgFile | tail -1 | awk -F= '{ print $2 }'`

			chk_config "CONFIG ERROR!  Falling back to pre-cache file. See $IcingaChkFile for details." precache

			if test $? = 0; then
				cp $IcingaPrecacheFile $IcingaPrecacheFile.good
				start
			else
				if test ! -e $IcingaPrecacheFile.good; then
					echo "Pre-cache file does not exist."
					exit 1
				fi

				cp $IcingaPrecacheFile.good $IcingaPrecacheFile
				start precache
			fi
		fi
		;;

	stop)
		if status_icinga; then

			printf "Stopping Icinga: "
			killproc_icinga

			# now we have to wait for icinga to exit and remove its
			# own IcingaRunFile, otherwise a following "start" could
			# happen, and then the exiting icinga will remove the
			# new IcingaRunFile, allowing multiple icinga daemons
			# to (sooner or later) run - John Sellens
			printf 'Waiting for icinga to exit .'
			for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15; do
				if status_icinga; then
					printf '.'
					sleep 1
				else
					break
				fi
			done
			if status_icinga; then
				echo ''
				echo 'Warning - icinga did not exit in a timely manner. Sending kill -9'
                                killproc9_icinga
			else
				echo 'Stopping icinga done.'
				remove_run_files
			fi
		else
			echo "icinga is already stopped!"
			exit 0
		fi
		;;

	status)
		printstatus_icinga
		;;

	checkconfig)
		chk_config " CONFIG ERROR!  See $IcingaChkFile for details."

		if test $? != 0; then
			exit 6
		fi
		;;

	show-errors)
		chk_config

		if test $? != 0; then
			exit 6
		fi
		;;

	restart)
		if test $IcingaPrecacheFallback != 1; then
			chk_config " CONFIG ERROR!  Restart aborted.  See $IcingaChkFile for details."

			if test $? != 0; then
				exit 6
			fi
		fi

		$0 stop
		start
		;;

	reload|force-reload)
		if test $IcingaPrecacheFallback != 1; then
			chk_config " CONFIG ERROR!  Reload aborted.  See $IcingaChkFile for details."

			if test $? != 0; then
				exit 6
			fi
		fi

		if status_icinga; then
			printf "Reloading icinga configuration..."
			reload_icinga
			echo "done"
		else
			$0 start
		fi
		;;

	*)
		echo "Usage: icinga {start|stop|restart|reload|force-reload|status|checkconfig|show-errors}"
		exit 1
		;;

	esac

	# End of this script
