#!/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