#!/bin/bash
#
# Copyright (c) 2014 Anand Subramanian anands@redhat.com
# Copyright (c) 2015 Red Hat Inc.
#                    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.
#
#

# Initialization:
: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs

if [ -n "$OCF_DEBUG_LIBRARY" ]; then
    . $OCF_DEBUG_LIBRARY
else
    : ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs
fi

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

<longdesc lang="en">
This Linux-specific resource agent acts as a dummy
resource agent for nfs-ganesha.
</longdesc>

<shortdesc lang="en">Manages the user-space nfs-ganesha NFS server</shortdesc>

<parameters>
</parameters>

<actions>
<action name="start"   timeout="40s" />
<action name="stop"    timeout="40s" />
<action name="status" depth="0"  timeout="20s" interval="5s" />
<action name="monitor" depth="0"  timeout="20s" interval="5s" />
<action name="meta-data"  timeout="20s" />
</actions>
</resource-agent>
END

return $OCF_SUCCESS
}

ganesha_grace_usage() {
	echo "ganesha.nfsd USAGE"
}

# Make sure meta-data and usage always succeed
case $__OCF_ACTION in
	meta-data)	ganesha_meta_data
			exit $OCF_SUCCESS
			;;
	usage|help)	ganesha_usage
			exit $OCF_SUCCESS
			;;
	*)
			;;
esac

ganesha_grace_start()
{
	local result=""
	local resourcename=""
	local deadserver=""
	local tmpIFS=${IFS}
	local pid_file="/var/run/ganesha.nfsd.pid"

	# RHEL6 /etc/init.d/nfs-ganesha adds "-p /var/run/ganesha.nfsd.pid"
	# RHEL7 systemd does not. Would be nicer if all distros used the
	# same pid file.
	if [ -e /usr/lib/systemd/system/nfs-ganesha.service ]; then
		pid_file="/var/run/ganesha.pid"
	fi

	# logger "ganesha_grace_start()"
	# we're here because somewhere in the cluster one or more
	# of the ganesha.nfsds have died, triggering a floating IP
	# address to move. Resource constraint location rules ensure
	# that this is invoked before the floating IP is moved.
	if [ -e ${pid_file} -a \
	     -d /proc/$(cat ${pid_file} ) ]; then
		# my ganesha.nfsd is still running
		# find out which one died?

		pcs status | grep dead_ip-1 | sort > /tmp/.pcs_status

		result=$(diff /var/run/ganesha/pcs_status /tmp/.pcs_status | grep '^>')
		if [[ ${result} ]]; then
			# logger "ganesha_grace_start(), ${result}"
			IFS=$'\n'
			for line in ${result}; do
				resourcename=$(echo ${line} | cut -f 1 | cut -d ' ' -f 3)
				deadserver=${resourcename%"-dead_ip-1"}

				if [[ ${deadserver} ]]; then
					# logger "ganesha_grace_start(), ${line}"
					# logger "ganesha_grace_start(), dbus-send --print-reply --system --dest=org.ganesha.nfsd /org/ganesha/nfsd/admin org.ganesha.nfsd.admin.grace string:${deadserver}"
					dbus-send --print-reply --system --dest=org.ganesha.nfsd /org/ganesha/nfsd/admin org.ganesha.nfsd.admin.grace string:${deadserver}
					if [ $? -ne 0 ]; then
						logger "warning: dbus-send --print-reply --system --dest=org.ganesha.nfsd /org/ganesha/nfsd/admin org.ganesha.nfsd.admin.grace string:${deadserver} failed"
					fi
				fi
			done
			IFS=${tmpIFS}
		fi

	fi
	return $OCF_SUCCESS
}

ganesha_grace_stop()
{

	# logger "ganesha_grace_stop()"
	return $OCF_SUCCESS
}

ganesha_grace_monitor()
{
	# logger "ganesha_grace_monitor()"
	if [ ! -d /var/run/ganesha ]; then
		mkdir -p /var/run/ganesha
	fi
	pcs status | grep dead_ip-1 | sort > /var/run/ganesha/pcs_status
	return $OCF_SUCCESS
}

ganesha_grace_validate()
{
	return $OCF_SUCCESS
}

ganesha_grace_validate

# logger "ganesha_grace ${OCF_RESOURCE_INSTANCE} $__OCF_ACTION"

# Translate each action into the appropriate function call
case $__OCF_ACTION in
start)          ganesha_grace_start
		;;
stop)           ganesha_grace_stop
		;;
status|monitor) ganesha_grace_monitor
		;;
*)              ganesha_grace_usage
                exit $OCF_ERR_UNIMPLEMENTED
                ;;
esac

rc=$?

# The resource agent may optionally log a debug message
ocf_log debug "${OCF_RESOURCE_INSTANCE} $__OCF_ACTION returned $rc"
exit $rc