if-up.d-ntpdate

#!/bin/sh

set -e

PATH=/sbin:/bin:/usr/sbin:/usr/bin

# This is a heuristic:  The idea is that if a static interface is brought
# up, that is a major event, and we can put in some extra effort to fix
# the system time.  Feel free to change this, especially if you regularly
# bring up new network interfaces.
if [ "$METHOD" = static ]; then
	OPTS="-b"
fi

if [ "$METHOD" = loopback ]; then
	exit 0
fi

# Check whether ntpdate was removed but not purged; it's useless to wait for 
# it in that case.
if [ ! -x /usr/sbin/ntpdate-debian ] && [ -d /usr/sbin ]; then
	exit 0
fi

(

# This is for the case that /usr will be mounted later.
if [ -r /lib/udev/hotplug.functions ]; then
	. /lib/udev/hotplug.functions
	wait_for_file /usr/sbin/ntpdate-debian
fi

LOCKFILE=/var/lock/ntpdate

# Avoid running more than one at a time
if [ -x /usr/bin/lockfile-create ]; then
	lockfile-create $LOCKFILE
	lockfile-touch $LOCKFILE &
	LOCKTOUCHPID="$!"
fi

if [ -x /etc/init.d/ntp ]; then
	/etc/init.d/ntp stop
fi

/usr/sbin/ntpdate-debian -u -s $OPTS 2>/dev/null || :

if [ -x /usr/bin/lockfile-create ] ; then
	kill $LOCKTOUCHPID
	lockfile-remove $LOCKFILE
fi

if [ -x /etc/init.d/ntp ]; then
	sleep 5
	/etc/init.d/ntp restart
fi

) &