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