initscripts: lvm2-monitor: implement status action

Two new functions added in the init script: rh_status and rh_status_q.
First one to be used in status() and second one to be used in start(),
stop(), force_stop(). Check for 'dmeventd' added and print list of
lvs being monitored in status().

WHATS_NEW

@@ -1,5 +1,6 @@
 Version 2.02.117 - 
 ====================================
+  Implement status action for lvm2-monitor initscript to display monitored LVs.
   Allow lvchange -p to change kernel state only if metadata state differs.
   Fix incorrect persistent .cache after report with label fields only (2.02.106).
   Reinstate PV tag recognition for pvs if reporting label fields only (2.02.105).

scripts/lvm2_monitoring_init_red_hat.in

@@ -32,18 +32,28 @@
 . /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="/var/run/dmeventd.pid"
 
 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
@@ -79,12 +89,14 @@ 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=$?
@@ -92,6 +104,7 @@ case "$1" in
 	;;
 
   stop)
+	rh_status_q || exit 0
 	test "$runlevel" = "0" && WARN=0
 	test "$runlevel" = "6" && WARN=0
 	stop
@@ -109,7 +122,9 @@ case "$1" in
 	;;
 
   status)
-	# TODO anyone with an idea how to dump monitored volumes?
+	rh_status
+	rtrn=$?
+	[ $rtrn = 0 ] && $LVS -S 'seg_monitor=monitored' -o lv_full_name,seg_monitor
 	;;
 
   *)