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#!/bin/bash
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#
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# Copyright (C) 2007-2009 Red Hat, Inc. All rights reserved.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions
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# of the GNU General Public License v.2.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#
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# This file is part of LVM2.
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# It is required for the proper handling of failures of LVM2 mirror
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# devices that were created using the -m option of lvcreate.
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#
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#
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# chkconfig: 12345 02 99
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# description: Starts and stops dmeventd monitoring for lvm2
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#
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# For Red-Hat-based distributions such as Fedora, RHEL, CentOS.
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#
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### BEGIN INIT INFO
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# Provides: lvm2-monitor
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# Required-Start: $local_fs
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# Required-Stop: $local_fs
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# Default-Start: 1 2 3 4 5
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# Default-Stop: 0 6
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# Short-Description: Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling
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### END INIT INFO
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. /etc/init.d/functions
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DAEMON=lvm2-monitor
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DMEVENTD_DAEMON=dmeventd
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exec_prefix=
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sbindir=/sbin
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VGCHANGE=${sbindir}/vgchange
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VGS=${sbindir}/vgs
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LVS=${sbindir}/lvs
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LOCK_FILE="/var/lock/subsys/$DAEMON"
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PID_FILE="/var/run/dmeventd.pid"
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WARN=1
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export LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES=1
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rh_status() {
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	status -p $PID_FILE $DMEVENTD_DAEMON
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}
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rh_status_q() {
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	rh_status >/dev/null 2>&1
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}
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start()
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{
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	ret=0
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	# TODO do we want to separate out already active groups only?
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	VGSLIST=`$VGS --noheadings -o name --ignoreskippedcluster --config 'log{command_names=0 prefix="  "}' 2> /dev/null`
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	for vg in $VGSLIST
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	do
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	    action "Starting monitoring for VG $vg:" $VGCHANGE --monitor y --poll y --ignoreskippedcluster --config 'log{command_names=0 prefix="  "}' $vg || ret=$?
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	done
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	return $ret
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}
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stop()
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{
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	ret=0
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	# TODO do we want to separate out already active groups only?
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	if test "$WARN" = "1"; then
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	   echo "Not stopping monitoring, this is a dangerous operation. Please use force-stop to override."
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	   return 1
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	fi
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	VGSLIST=`$VGS --noheadings -o name --ignoreskippedcluster --config 'log{command_names=0 prefix="  "}' 2> /dev/null`
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	for vg in $VGSLIST
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	do
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	    action "Stopping monitoring for VG $vg:" $VGCHANGE --monitor n --ignoreskippedcluster --config 'log{command_names=0 prefix="  "}' $vg || ret=$?
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	done
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	return $ret
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}
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rtrn=1
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# See how we were called.
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case "$1" in
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  start)
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	rh_status_q && exit 0
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	start
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	rtrn=$?
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	[ $rtrn = 0 ] && touch $LOCK_FILE
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	;;
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  force-stop)
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	rh_status_q || exit 0
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	WARN=0
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	stop
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	rtrn=$?
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	[ $rtrn = 0 ] && rm -f $LOCK_FILE
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	;;
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  stop)
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	rh_status_q || exit 0
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	test "$runlevel" = "0" && WARN=0
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	test "$runlevel" = "6" && WARN=0
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	stop
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	rtrn=$?
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	[ $rtrn = 0 ] && rm -f $LOCK_FILE
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	;;
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  restart)
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	WARN=0
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	if stop
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	then
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		start
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	fi
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	rtrn=$?
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	;;
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  status)
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	rh_status
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	rtrn=$?
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	[ $rtrn = 0 ] && $LVS -S 'seg_monitor=monitored' -o lv_full_name,seg_monitor
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	;;
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  *)
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	echo $"Usage: $0 {start|stop|restart|status|force-stop}"
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	;;
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esac
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exit $rtrn