#!/bin/sh

echo "adding cron entry for NTP time synchronisation"

FILE=${INSTALL_DST}/var/spool/cron/crontabs/root

# quit if ntpdate seems to not be installed
[ -x ${INSTALL_DST}/usr/sbin/ntpdate ] || exit

# quit if ntpdate seems to be in the crontab already
grep -c ntpdate ${FILE} > /dev/null && exit

# pick an arbitrary minute past the hour to run the job
# we use the seconds part of the current time
WHEN=`date +%S`

# append the entry to the crontab
echo "${WHEN} * * * * /usr/sbin/ntpdate ntp0.lancs.ac.uk ntp1.lancs.ac.uk > /dev/null" >> ${FILE}