#!/bin/bash
#
# Copyright © 2015 Codethink Limited
#
# 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; version 2 of the License.
#
# 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/>.


set -e

ROOT="$1"

# NTP conflicts with systemd-timesyncd,
# so if we want to use NTP then we need to disable systemd-timesyncd
rm "$ROOT/etc/systemd/system/sysinit.target.wants/systemd-timesyncd.service"

# On at least x86 64 the default rlimit
# ntp sets (32kB) isn't enough, so increase it
cat >> "$ROOT/etc/ntp.conf" << EOF

# The default rlimit isn't enough in some cases
# so we set a higher limit here
rlimit memlock 256
EOF

NTPD_PIDFILE=/run/ntpd.pid
cat > "$ROOT/usr/lib/systemd/system/ntpd.service" << EOF
[Unit]
Description=Network Time Service
After=network.target nss-lookup.target
Conflicts=systemd-timesyncd.service

[Service]
Type=forking
PIDFile=$NTPD_PIDFILE
ExecStart=/usr/bin/ntpd -u ntp:ntp -p $NTPD_PIDFILE
PrivateTmp=True
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

ln -s "/usr/lib/systemd/system/ntpd.service" \
    "$ROOT/usr/lib/systemd/system/multi-user.target.wants/ntpd.service"