#!/bin/sh

# Copyright (C) 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

set -e

ROOT="$1"

unnaceptable(){
    eval echo Unexpected value \$$1 for $1 >&2
    exit 1
}

check_bool(){
    case "$(eval echo \"\$$1\")" in
    True)
        eval "$1=true"
        ;;
    False|'')
        eval "$1=false"
        ;;
    *)
        unnaceptable "$1"
        ;;
    esac
}
check_bool SYNC_TIME_WITH_CONTROLLER

if "$SYNC_TIME_WITH_CONTROLLER"; then

    cat << EOF > "$ROOT"/etc/ntpd.conf
# We use iburst here to reduce the potential initial delay to set the clock
server $CONTROLLER_HOST_ADDRESS iburst

# kod - notify client when packets are denied service,
# rather than just dropping the packets
#
# nomodify - deny queries which attempt to modify the state of the server
#
# notrap - decline to provide mode 6 control message trap service to
# matching hosts
#
# see ntp.conf(5) for more details
restrict -4 default limited limited nomodify
restrict -6 default limited limited notrap nomodify
EOF

fi