#!/bin/sh
################################################################################
#
# This file is part of the vhacs project.
# Jerome Martin <jmartin@longphone.fr>
#
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#
# iSCSI initiator-based filesystem mount OCF resource agent
# 	Logs into an iSCSI target and locally mount the corresponding filesystem
#
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#
# OCF instance parameters:
#	OCF_RESKEY_target: the iSCSI target (required)
#	OCF_RESKEY_portal: the iSCSI portal address (required)
#	OCF_RESKEY_mountpoint: the filesystem mountpoint (required)
#	OCF_RESKEY_fstype: the filesystem type (required)
#   OCF_RESKEY_iscsiadm: iscsiadm program path (optional)
#
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#
# Source common vhacs OCF RA code.
. ${OCF_ROOT}/resource.d/vhacs/.ocf-vhacs
#
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rsc_meta_data() {
	cat <<- EOF
		<?xml version="1.0"?>
		<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
		<resource-agent name="iscsi_mount">
			<version>1.0</version>
			<longdesc lang="en">
				OCF Resource Agent for mounting iSCSI devices.
			</longdesc>
			<shortdesc lang="en">iscsi filesystem mount resource agent</shortdesc>
			<parameters>
				<parameter name="target" unique="1" required="1">
					<longdesc lang="en">
						The iSCSI target iqn.
					</longdesc>
					<shortdesc lang="en">target</shortdesc>
					<content type="string" default="" />
				</parameter>
				<parameter name="portal" unique="0" required="1">
					<longdesc lang="en">
						The iSCSI portal ip address
					</longdesc>
					<shortdesc lang="en">portal</shortdesc>
					<content type="string" default="" />
				</parameter>
				<parameter name="mountpoint" unique="1" required="1">
					<longdesc lang="en">
						The mountpoint for iSCSI device.
						If the mountpoint does not exist, it will be created.
						In all cases, the mountpoint will be deleted upon
						umount action.
					</longdesc>
					<shortdesc lang="en">mountpoint</shortdesc>
					<content type="string" default="" />
				</parameter>
				<parameter name="fstype" unique="0" required="1">
					<longdesc lang="en">
						The filesystem type on the iSCSI device.
					</longdesc>
					<shortdesc lang="en">fstype</shortdesc>
					<content type="string" default="" />
				</parameter>
				<parameter name="iscsiadm" unique="0" required="0">
					<longdesc lang="en">
						iscsiadm program path.
					</longdesc>
					<shortdesc lang="en">iscsiadm</shortdesc>
					<content type="string" default="" />
				</parameter>
			</parameters>
			<actions>
				<action name="start" timeout="30" />
				<action name="stop" timeout="30" />
				<action name="status" timeout="30" />
				<action name="monitor" depth="0" timeout="30" interval="120" start-delay="10" />
				<action name="validate-all" timeout="5" />
				<action name="methods" timeout="5" />
				<action name="meta-data" timeout="5" />
			</actions>
		</resource-agent>
	EOF
}

rsc_start() {
	ocf_lock_RA
	# do some cleanup before discovery
	rm -f "/etc/iscsi/send_targets/${OCF_RESKEY_portal},3260" &>/dev/null
	rm -f "/etc/iscsi/nodes/${OCF_RESKEY_target}" &>/dev/null

	# update discovery information
	ocf_cmd "iscsiadm -m discovery -t st -p ${OCF_RESKEY_portal}" || return ${OCF_ERR_GENERIC}
	ocf_unlock_RA

	# start the iscsi session
	ocf_cmd "iscsiadm -m node -p ${OCF_RESKEY_portal} -T ${OCF_RESKEY_target} -l" || return ${OCF_ERR_GENERIC}

	# wait for udev to create the device or fails after a few seconds
	local tries=0 
	local maxtries=10
	while [ ${tries} -lt ${maxtries} ] ; do
		let tries++
		sleep 0.5
		ls ${DEVICE_PATH} &>/dev/null && break
	done
	ocf_cmd "ls ${DEVICE_PATH}" || return ${OCF_ERR_GENERIC}

	# make sure the mountpoint exists
	ocf_cmd "mkdir -p ${OCF_RESKEY_mountpoint}" || return ${OCF_ERR_GENERIC}

	# mount the device
	ocf_cmd "mount -o errors=continue ${DEVICE_PATH} ${OCF_RESKEY_mountpoint} -t ${OCF_RESKEY_fstype}" || return ${OCF_ERR_GENERIC}

	# If there where no errors, return success
	return ${OCF_SUCCESS}
}

rsc_stop() {
	# umount the device and delete the mountpoint
    ocf_log info "rsc_stop trying to umount and delete ${OCF_RESKEY_mountpoint}"
	fuser -k -m ${OCF_RESKEY_mountpoint} &>/dev/null # this fails most of the time
	ocf_cmd "umount ${OCF_RESKEY_mountpoint}"
	ocf_cmd "rm -rf ${OCF_RESKEY_mountpoint}"

	#ocf_lock_RA
	# tear down the iscsi session
	ocf_log info "rsc_stop trying to tear down the iscsi session with ${OCF_RESKEY_target} on ${OCF_RESKEY_portal}"
	ocf_cmd "iscsiadm -m node -p ${OCF_RESKEY_portal} -T ${OCF_RESKEY_target} -u"

	# cleanup after stop
	rm -f "/etc/iscsi/send_targets/${OCF_RESKEY_portal},3260" &>/dev/null
	rm -f "/etc/iscsi/nodes/${OCF_RESKEY_target}" &>/dev/null
	#ocf_unlock_RA

	# We've done all we could to stop that resource, let monitor check it
	return ${OCF_SUCCESS}
}

rsc_monitor() {
	# Reset checks count
	ocf_checks_reset

	# Check if the session is up
	iscsiadm -m session 2>/dev/null | grep -qs "$OCF_RESKEY_target$" &>/dev/null
	ocf_checks_checkrc "Does iscsi session for $OCF_RESKEY_target exist with ${OCF_RESKEY_portal} ?"

	# Check if the device is mounted rw on the proper mountpoint
	grep "${DEVICE_PATH} ${OCF_RESKEY_mountpoint} ${OCF_RESKEY_fstype} rw" /proc/mounts &>/dev/null
	ocf_checks_checkrc "Is the device ${DEVICE_PATH} mounted rw on ${OCF_RESKEY_mountpoint} as ${OCF_RESKEY_fstype} ?" 

	# Return checks result
	ocf_checks_result
	return $?
}

rsc_setup() {
	DEVICE_PATH="/dev/disk/by-path/ip-${OCF_RESKEY_portal}:3260-iscsi-${OCF_RESKEY_target}-lun-0"
	return ${OCF_SUCCESS}
}

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#
# Call the main ocf RA logic
#
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ocf_main $1