#!/bin/sh

set -e

DAEMON=/usr/sbin/chronyd
RUNDIR=/run/chrony
VARDIR=/var/lib/chrony
LOGDIR=/var/log/chrony
PIDFILE=${RUNDIR}/chrony.pid
USER=ntp
GROUP=ntp

# Start/stop/restart chrony daemon.
__start() {
  if [ -e $RUNDIR ]; then
    chown -R ${USER}:${GROUP} $RUNDIR
  else
    install -dm 0750 -o $USER -g $GROUP $RUNDIR
  fi

  if [ -e $VARDIR ]; then
    chown -R ${USER}:${GROUP} $VARDIR
  else
    install -dm 0755 -o $USER -g $GROUP $VARDIR
  fi

  if [ -e $LOGDIR ]; then
    chown -R ${USER}:${GROUP} $LOGDIR
  else
    install -dm 0755 -o $USER -g $GROUP $LOGDIR
  fi

  if [ -e ${VARDIR}/drift ]; then
    :
  else
    touch ${VARDIR}/drift
  fi

  chown ${USER}:${GROUP} ${VARDIR}/drift

  if [ -x $DAEMON ]; then
    echo "Starting NTP daemon:  $DAEMON -m"
    $DAEMON -m
  fi
}

__stop() {
  echo "Stopping NTP daemon:  $DAEMON -m"
  if [ -r $PIDFILE ]; then
    kill $(cat $PIDFILE)
  else
    echo "Chronyd is not running"
  fi
}

__restart() {
  __stop

  for i in 1 2 3; do
    if [ -r $PIDFILE ]; then
      # ash/dash/nash builtin echo just ignoring -n option
      /usr/bin/echo -n "."
      sleep 1
    else
      break
    fi
  done

  echo

  __start
}

case "$1" in
'start')
  __start
  ;;
'stop')
  __stop
  ;;
'restart')
  __restart
  ;;
*)
  echo "usage $0 start|stop|restart"
esac