From 35607d232a8c1adc82498de910f84d20730d2b82 Mon Sep 17 00:00:00 2001
From: Dobrica Pavlinusic <dpavlin@rot13.org>
Date: Tue, 16 Mar 2010 15:33:30 +0000
Subject: [PATCH] add powerfail to container's /etc/inittab which halt on kill
 -SIGPWR

git-svn-id: svn://svn.rot13.org/sysadmin-cookbook@179 191e9f34-6774-4a6d-acfc-7664dacd4a2a
---
 recepies/lxc/lxc-watchdog.sh | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/recepies/lxc/lxc-watchdog.sh b/recepies/lxc/lxc-watchdog.sh
index 8c78e91..97ab178 100755
--- a/recepies/lxc/lxc-watchdog.sh
+++ b/recepies/lxc/lxc-watchdog.sh
@@ -16,12 +16,40 @@ fi
 rootfs=`grep lxc.rootfs /var/lib/lxc/$name/config | cut -d= -f2`
 echo "$name rootfs $rootfs"
 
+
 # cleanup init scripts which don't work in containers
-ls $rootfs/etc/rc?.d/*umountfs 2>/dev/null | xargs -i rm -v {}
-ls $rootfs/etc/rc?.d/*umountroot 2>/dev/null | xargs -i rm -v {}
-ls $rootfs/etc/rc?.d/*hwclock* 2>/dev/null | xargs -i rm -v {}
+ls \
+	$rootfs/etc/rc?.d/*umountfs \
+	$rootfs/etc/rc?.d/*umountroot \
+	$rootfs/etc/rc?.d/*hwclock* \
+2>/dev/null | xargs -i rm -v {}
+
+
+# let container respond to kill -SIGPWR
+inittab=$rootfs/etc/inittab
+powerfail="pw::powerfail:/sbin/init 0"
+if ! grep "$powerfail" ${inittab} >/dev/null ; then
+	grep -v ::power ${inittab} > ${inittab}.new
+	echo $powerfail >> ${inittab}.new
+	mv ${inittab}.new ${inittab}
+	echo "$initab modified"
+fi
+
 
-lxc-info -n $name | grep RUNNING || lxc-start -d -n $name -o /tmp/${name}.log && echo "$name start"
+if [ "$2" == "stop" ] ; then
+	echo "$name stop"
+	kill -SIGPWR `head -1 /cgroup/$name/tasks`
+	lxc-wait -n $name -s STOPPED
+	exit
+fi
+
+
+if ! lxc-info -n $name | grep RUNNING ; then
+	echo "$name start"
+	lxc-start -n $name -o /tmp/${name}.log -d
+	lxc-wait  -n $name -s RUNNING
+	lxc-info  -n $name
+fi
 
 while true; do
 	# time of 5 minutes on it JUST IN CASE...
-- 
2.20.1