#!/bin/bash

ntpconf=/etc/ntp.conf

ntpstep=/etc/ntp/step-tickers

[ "$EUID" != "0" ] && exit 4

[ -x /usr/sbin/ntpdate ] || exit 5

[ -f /etc/sysconfig/ntpdate ] || exit 6

. /etc/sysconfig/ntpdate

[ -f $ntpstep ] && tickers=$(sed 's/#.*//' $ntpstep) || tickers=

if ! echo "$tickers" | grep -qi '[a-z0-9]' && [ -f $ntpconf ]; then

	# the step-tickers file doesn't specify a server,

	# use servers from ntp.conf instead

	tickers=$(awk '$1=="peer"||$1=="server"{print $2}' $ntpconf | \

		grep -Ev '127\.127\.[0-9]+\.[0-9]+')

fi

if ! echo "$tickers" | grep -qi '[a-z0-9]'; then

	echo "NTP server not specified in $ntpstep or $ntpconf"

	exit 6

fi

[ -z "$RETRIES" ] && RETRIES=2

retry=0

while true; do

	/usr/sbin/ntpdate -U ntp -s -b $OPTIONS $tickers &> /dev/null

	RETVAL=$?

	[ $RETVAL -eq 0 ] || [ $retry -ge "$RETRIES" ] && break

	sleep $[10 * (1 << $retry)]

	retry=$[$retry + 1]

done

[ $RETVAL -eq 0 ] && [ "$SYNC_HWCLOCK" = "yes" ] && /sbin/hwclock --systohc

exit $RETVAL