#!/bin/bash
#
# ntp.sh: dhclient-script plugin for NTP settings,
# place in /etc/dhcp/dhclient.d and 'chmod +x ntp.sh' to enable
#
# Copyright (C) 2008 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Author(s): David Cantrell <dcantrell@redhat.com>
# Miroslav Lichvar <mlichvar@redhat.com>
#
CONF=/etc/ntp.conf
SAVECONF=${SAVEDIR}/${CONF##*/}.predhclient.${interface}
ntp_replace_conf() {
echo "$1" | diff -q ${CONF} - > /dev/null 2>&1
if [ $? -eq 1 ]; then
echo "$1" > ${CONF}
restorecon ${CONF} >/dev/null 2>&1
service ntpd condrestart >/dev/null 2>&1
fi
}
ntp_config() {
if [ ! "${PEERNTP}" = "no" ] && [ -n "${new_ntp_servers}" ] &&
[ -e ${CONF} ] && [ -d ${SAVEDIR} ]; then
local conf=$(egrep -v '^server .* # added by /sbin/dhclient-script$' < ${CONF})
local unique_servers=$(comm -23 \
<(for s in ${new_ntp_servers}; do echo $s; done | sort -u) \
<(echo "$conf" | awk '$1=="peer"||$1=="server"{print $2}' | sort -u))
conf=$(echo "$conf"
for s in ${unique_servers}; do
echo "server ${s} # added by /sbin/dhclient-script"
done)
[ -f ${SAVECONF} ] || touch ${SAVECONF}
ntp_replace_conf "$conf"
fi
}
ntp_restore() {
if [ -e ${CONF} ] && [ -f ${SAVECONF} ]; then
local conf=$(egrep -v '^server .* # added by /sbin/dhclient-script$' < ${CONF})
ntp_replace_conf "$conf"
rm -f ${SAVECONF}
fi
}
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