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/usr/lib/ocf/resource.d/pacemaker/ClusterMon is in pacemaker-resource-agents 1.1.18-0ubuntu1.

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The actual contents of the file can be viewed below.

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#!/bin/bash
#
#
#	ClusterMon OCF RA.
#	Starts crm_mon in background which logs cluster status as
#	html to the specified file.
#
# Copyright (c) 2004 SUSE LINUX AG, Lars Marowsky-Brée
#                    All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#
# OCF instance parameters:
#	OCF_RESKEY_user
#	OCF_RESKEY_pidfile
#	OCF_RESKEY_update
#	OCF_RESKEY_extra_options
#	OCF_RESKEY_htmlfile

#######################################################################
# Initialization:
: ${OCF_FUNCTIONS=${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs}
. ${OCF_FUNCTIONS}
: ${__OCF_ACTION=$1}

#######################################################################

meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="ClusterMon" version="1.0">
<version>1.0</version>

<longdesc lang="en">
This is a ClusterMon Resource Agent.
It outputs current cluster status to the html.
</longdesc>
<shortdesc lang="en">Runs crm_mon in the background, recording the cluster status to an HTML file</shortdesc>

<parameters>

<parameter name="user" unique="0">
<longdesc lang="en">
The user we want to run crm_mon as
</longdesc>
<shortdesc lang="en">The user we want to run crm_mon as</shortdesc>
<content type="string" default="root" />
</parameter>

<parameter name="update" unique="0">
<longdesc lang="en">
How frequently should we update the cluster status (in milliseconds).
For compatibility with old documentation, values less than 1000 will be treated
as seconds.
</longdesc>
<shortdesc lang="en">Update interval in milliseconds</shortdesc>
<content type="integer" default="15000" />
</parameter>

<parameter name="extra_options" unique="0">
<longdesc lang="en">
Additional options to pass to crm_mon.  Eg. -n -r
</longdesc>
<shortdesc lang="en">Extra options</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="pidfile" unique="1">
<longdesc lang="en">
PID file location to ensure only one instance is running
</longdesc>
<shortdesc lang="en">PID file</shortdesc>
<content type="string" default="/tmp/ClusterMon_${OCF_RESOURCE_INSTANCE}.pid" />
</parameter>

<parameter name="htmlfile" unique="1" required="0">
<longdesc lang="en">
Location to write HTML output to.
</longdesc>
<shortdesc lang="en">HTML output</shortdesc>
<content type="string" default="/tmp/ClusterMon_${OCF_RESOURCE_INSTANCE}.html" />
</parameter>
</parameters>

<actions>
<action name="start"   timeout="20" />
<action name="stop"    timeout="20" />
<action name="monitor" depth="0"  timeout="20" interval="10" />
<action name="meta-data"  timeout="5" />
<action name="validate-all"  timeout="30" />
</actions>
</resource-agent>
END
}

#######################################################################

ClusterMon_usage() {
	cat <<END
usage: $0 {start|stop|monitor|validate-all|meta-data}

Expects to have a fully populated OCF RA-compliant environment set.
END
}

ClusterMon_exit() {
	if [ $1 != 0 ]; then
		exit $OCF_ERR_GENERIC
	else
		exit $OCF_SUCCESS
	fi
}

ClusterMon_start() {
    cmd_prefix=""
    cmd_suffix=""
    if [ ! -z $OCF_RESKEY_user ]; then
	su - $OCF_RESKEY_user -c "$CMON_CMD"
    else
	$CMON_CMD
    fi
    ClusterMon_exit $?
}

ClusterMon_stop() {
    if [ -f $OCF_RESKEY_pidfile ]; then
	pid=`cat $OCF_RESKEY_pidfile`
	if [ ! -z $pid ]; then
	    kill -s 9 $pid
	    rm -f $OCF_RESKEY_pidfile
	fi
    fi
    ClusterMon_exit 0
}

ClusterMon_monitor() {
    if [ -f $OCF_RESKEY_pidfile ]; then
	pid=`cat $OCF_RESKEY_pidfile`
	if [ ! -z $pid ]; then
	    str=$(echo "su - $OCF_RESKEY_user -c \"$CMON_CMD\"" | tr 'crmon, \t' 'xxxxxxxx')
	    ps -o "args=${str}" -p $pid 2>/dev/null | \
		grep -qE "[c]rm_mon.*${OCF_RESKEY_pidfile}"
	    rc=$?
	    case $rc in
		0) exit $OCF_SUCCESS;;
		1) exit $OCF_NOT_RUNNING;;
		*) exit $OCF_ERR_GENERIC;;
	    esac
	fi
    fi
    exit $OCF_NOT_RUNNING
}

CheckOptions() {
while getopts Vi:nrh:cdp: OPTION
do
    case $OPTION in
    V|n|r|c|d);;
    i)	ocf_log warn "You should not have specified the -i option, since OCF_RESKEY_update is set already!";;
    h)	ocf_log warn "You should not have specified the -h option, since OCF_RESKEY_htmlfile is set already!";;
    p)	ocf_log warn "You should not have specified the -p option, since OCF_RESKEY_pidfile is set already!";;
    *)  return $OCF_ERR_ARGS;;
    esac
done		

if [ $? -ne 0 ]; then
    return $OCF_ERR_ARGS
fi

# We should have eaten all options at this stage
shift $(($OPTIND -1))
if [ $# -gt 0 ]; then
    false
else
    true
fi
}

ClusterMon_validate() {
# Existence of the user
    if [ ! -z $OCF_RESKEY_user ]; then
	getent passwd "$OCF_RESKEY_user" >/dev/null
	if [ $? -eq 0 ]; then
	    : Yes, user exists. We can further check his permission on crm_mon if necessary
	else
	    ocf_log err "The user $OCF_RESKEY_user does not exist!"
	    exit $OCF_ERR_ARGS
	fi
    fi

# Pidfile better be an absolute path
    case $OCF_RESKEY_pidfile in
	/*) ;;
	*) ocf_log warn "You should have pidfile($OCF_RESKEY_pidfile) of absolute path!" ;;
    esac

# Check the update interval
    if ocf_is_decimal "$OCF_RESKEY_update" && [ $OCF_RESKEY_update -gt 0 ]; then
	:
    else
	ocf_log err "Invalid update interval $OCF_RESKEY_update. It should be positive integer!"
	exit $OCF_ERR_ARGS
    fi

    if CheckOptions $OCF_RESKEY_extra_options; then
	:
    else
	ocf_log err "Invalid options $OCF_RESKEY_extra_options!"
	exit $OCF_ERR_ARGS
    fi

# Htmlfile better be an absolute path
    case $OCF_RESKEY_htmlfile in
	/*) ;;
	*) ocf_log warn "You should have htmlfile($OCF_RESKEY_htmlfile) of absolute path!" ;;
    esac

     
    echo "Validate OK"
    return $OCF_SUCCESS
}

if [ $# -ne 1 ]; then
    ClusterMon_usage
    exit $OCF_ERR_ARGS
fi

: ${OCF_RESKEY_update:="15000"}
: ${OCF_RESKEY_pidfile:="/tmp/ClusterMon_${OCF_RESOURCE_INSTANCE}.pid"}
: ${OCF_RESKEY_htmlfile:="/tmp/ClusterMon_${OCF_RESOURCE_INSTANCE}.html"}

if [ ${OCF_RESKEY_update} -ge 1000 ]; then
	OCF_RESKEY_update=$(( $OCF_RESKEY_update / 1000 ))
fi

CMON_CMD="${HA_SBIN_DIR}/crm_mon -p $OCF_RESKEY_pidfile -d -i $OCF_RESKEY_update $OCF_RESKEY_extra_options -h $OCF_RESKEY_htmlfile"

case $__OCF_ACTION in
meta-data)	meta_data
		exit $OCF_SUCCESS
		;;
start)		ClusterMon_start
		;;
stop)		ClusterMon_stop
		;;
monitor)	ClusterMon_monitor
		;;
validate-all)	ClusterMon_validate
		;;
usage|help)	ClusterMon_usage
		exit $OCF_SUCCESS
		;;
*)		ClusterMon_usage
		exit $OCF_ERR_UNIMPLEMENTED
		;;
esac

exit $?