#!/bin/bash
#
# Copyright (C) 2007-2009 Red Hat, Inc. All rights reserved.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# This file is part of LVM2.
# It is required for the proper handling of failures of LVM2 mirror
# devices that were created using the -m option of lvcreate.
#
#
# chkconfig: 12345 02 99
# description: Starts and stops dmeventd monitoring for lvm2
#
# For Red-Hat-based distributions such as Fedora, RHEL, CentOS.
#	       
### BEGIN INIT INFO
# Provides: lvm2-monitor
# Required-Start: $local_fs
# Required-Stop: $local_fs
# Default-Start: 1 2 3 4 5
# Default-Stop: 0 6
# Short-Description: Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling
### END INIT INFO

. /etc/init.d/functions

DAEMON=lvm2-monitor
DMEVENTD_DAEMON=dmeventd

exec_prefix=@exec_prefix@
sbindir=@sbindir@

VGCHANGE=${sbindir}/vgchange
VGS=${sbindir}/vgs
LVS=${sbindir}/lvs

LOCK_FILE="/var/lock/subsys/$DAEMON"
PID_FILE="@DMEVENTD_PIDFILE@"

WARN=1
export LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES=1

rh_status() {
	status -p $PID_FILE $DMEVENTD_DAEMON
}

rh_status_q() {
	rh_status >/dev/null 2>&1
}
start()
{
	ret=0
	# TODO do we want to separate out already active groups only?
	VGSLIST=`$VGS --noheadings -o name --ignoreskippedcluster --config 'log{command_names=0 prefix="  "}' 2> /dev/null`
	for vg in $VGSLIST
	do
	    action "Starting monitoring for VG $vg:" $VGCHANGE --monitor y --poll y --ignoreskippedcluster --config 'log{command_names=0 prefix="  "}' $vg || ret=$?
	done

	return $ret
}


stop()
{
	ret=0
	# TODO do we want to separate out already active groups only?
	if test "$WARN" = "1"; then
	   echo "Not stopping monitoring, this is a dangerous operation. Please use force-stop to override."
	   return 1
	fi
	VGSLIST=`$VGS --noheadings -o name --ignoreskippedcluster --config 'log{command_names=0 prefix="  "}' 2> /dev/null`
	for vg in $VGSLIST
	do
	    action "Stopping monitoring for VG $vg:" $VGCHANGE --monitor n --ignoreskippedcluster --config 'log{command_names=0 prefix="  "}' $vg || ret=$?
	done
	return $ret
}

rtrn=1

# See how we were called.
case "$1" in
  start)
	rh_status_q && exit 0
	start
	rtrn=$?
	[ $rtrn = 0 ] && touch $LOCK_FILE
	;;

  force-stop)
	rh_status_q || exit 0
	WARN=0
	stop
	rtrn=$?
	[ $rtrn = 0 ] && rm -f $LOCK_FILE
	;;

  stop)
	rh_status_q || exit 0
	test "$runlevel" = "0" && WARN=0
	test "$runlevel" = "6" && WARN=0
	stop
	rtrn=$?
	[ $rtrn = 0 ] && rm -f $LOCK_FILE
	;;

  restart)
	WARN=0
	if stop
	then
		start
	fi 
	rtrn=$?
	;;

  status)
	rh_status
	rtrn=$?
	[ $rtrn = 0 ] && $LVS -S 'seg_monitor=monitored' -o lv_full_name,seg_monitor
	;;

  *)
	echo $"Usage: $0 {start|stop|restart|status|force-stop}"
	;;
esac

exit $rtrn