#!/bin/sh
# Start/stop/restart ntpd.

NTP_CONF=/etc/ntp.conf

ntptimeset() {
    for i in $(gawk '/^server/ { if( $2 != "127.127.1.0" ) print $2 }' $NTP_CONF)
    do 
            sntp -p no $i 2>/dev/null 1>&2 && { SYNCHRONISED=$i; break; };
    done
    if [ "$SYNCHRONISED" ]
    then
            echo "Time synchronized with $SYNCHRONISED"
    else
            echo "Time could not be synchronized"
    fi
}

# Start ntpd:
ntpd_start() {
  ntptimeset
  CMDLINE="/usr/sbin/ntpd -g"
  echo -n "Starting NTP daemon:  $CMDLINE"
  $CMDLINE -p /var/run/ntpd.pid
  echo
}

# Stop ntpd:
ntpd_stop() {
  echo -n "Stopping NTP daemon..."
  if [ -r /var/run/ntpd.pid ]; then
    kill -HUP $(cat /var/run/ntpd.pid)
    rm -f /var/run/ntpd.pid
  else
    killall -HUP -q ntpd
  fi
  echo
}

# Restart ntpd:
ntpd_restart() {
  ntpd_stop
  sleep 1
  ntpd_start
}

# Check if ntpd is running
ntpd_status() {
  if [ -e /var/run/ntpd.pid ]; then
    echo "ntpd is running."
  else 
    echo "ntpd is stopped."
    exit 1
  fi
}

case "$1" in
'start')
  ntpd_start
  ;;
'stop')
  ntpd_stop
  ;;
'restart')
  ntpd_restart
  ;;
'status')
  ntpd_status
  ;;
*)
  echo "usage $0 start|stop|restart|status"
esac