#!/bin/sh
  
  PATH=/sbin:/bin:/usr/bin
  
  test -x /usr/bin/ntpdate || exit 0
  
  if test -f /etc/default/ntpdate ; then
  . /etc/default/ntpdate
  fi
  
  if [ "$NTPSERVERS" = "" ] ; then
  	if [ "$METHOD" = "" -a "$1" != "silent" ] ; then
  		echo "Please set NTPSERVERS in /etc/default/ntpdate"
  		exit 1
  	else
  		exit 0
  	fi
  fi
  
  # 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
  
  (
  
  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 /usr/bin/ntpdate -s $OPTS $NTPSERVERS 2>/dev/null; then
  	if [ "$UPDATE_HWCLOCK" = "yes" ]; then
  		hwclock --systohc || :
  	fi
  fi
  
  if [ -x /usr/bin/lockfile-create ] ; then
  	kill $LOCKTOUCHPID
  	lockfile-remove $LOCKFILE
  fi
  
  ) &