/etc/dhcp/dhclient-exit-hooks.d/ntpdate is in ntpdate 1:4.2.6.p3+dfsg-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | NTPDATE_CONF=/etc/default/ntpdate
NTPDATE_DHCP_CONF=/var/lib/ntpdate/default.dhcp
ntp_servers_setup_remove() {
rm -f $NTPDATE_DHCP_CONF
}
ntp_servers_setup_add() {
if [ -e $NTPDATE_DHCP_CONF ] && [ "$new_ntp_servers" = "$old_ntp_servers" ]; then
return
fi
if [ -z "$new_ntp_servers" ]; then
ntp_servers_setup_remove
return
fi
tmp=$(mktemp "$NTPDATE_DHCP_CONF.XXXXXX") || return
chmod --reference=$NTPDATE_CONF $tmp
chown --reference=$NTPDATE_CONF $tmp
(
echo "# NTP server entries received from DHCP server"
echo "NTPSERVERS='$new_ntp_servers'"
) >>$tmp
mv $tmp $NTPDATE_DHCP_CONF
}
ntp_servers_setup() {
case $reason in
BOUND|RENEW|REBIND|REBOOT)
ntp_servers_setup_add
;;
EXPIRE|FAIL|RELEASE|STOP)
ntp_servers_setup_remove
;;
esac
}
ntp_servers_setup
|