#! /bin/sh
### BEGIN INIT INFO
# Provides: btsync daemon
# Required-Start: $syslog
# Required-Stop: $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: BTSync server daemon
# Description: Daemon script to run a BTSync permanent peer
# Placed in /etc/init.d.
### END INIT INFO
# Author: Nicolas Bernaerts <nicolas.bernaerts@laposte.net>
# Version:
#  V1.0, 06/09/2013 - Creation
#  V1.1, 09/09/2013 - Use under-priviledged system user

# description variables
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="BTSync server"
NAME="btsync"
USER=$NAME
DAEMON=/usr/local/sbin/$NAME
ROOT=/home/$NAME
PIDFILE=$ROOT/$NAME.pid

# Exit if btsync program is not installed
if [ ! -x "$DAEMON" ] ; then
  echo "Binary $DAEMON does not exist. Aborting"
  exit 0
fi

# Exit if btsync user home directory doesn't exist
if [ ! -d "$ROOT" ]; then
  echo "User $USER does not exist. Aborting"
  exit 0
fi

# Function that starts the daemon/service
# 0 - daemon started
# 1 - daemon already running
# 2 - daemon could not be started
do_start()
{
  # If needed, start the daemon
  if [ -f "$PIDFILE" ]
  then
    echo "$NAME already running"
    RETVAL="1"
  else
    start-stop-daemon --start --quiet --chuid $USER --name $NAME --exec $DAEMON -- --config /etc/btsync.conf
    RETVAL="$?"
    [ "$RETVAL" = "0" ] && echo "$NAME started"
  fi

  return "$RETVAL"
}

# Function that stops the daemon/service
# 0 - daemon stopped
# 1 - daemon already stopped
# 2 - daemon could not be stopped
do_stop()
{
  # Stop the daemon
  start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
  RETVAL="$?"
  [ "$RETVAL" = "0" ] && echo "$NAME stopped"
  [ "$RETVAL" = "1" ] && echo "$NAME was not running"

  # remove pid file
  rm -f $PIDFILE

  return "$RETVAL"
}

# deal with different parameters : start, stop & status
case "$1" in
  # start service
  start)
    do_start
    ;;
  # stop service
  stop)
    do_stop
    ;;
  # restart service
  restart)
    do_stop
    do_start
    ;;
  # unknown command, display help message
  *)
    echo "Usage : $SCRIPTNAME {start|stop|restart}" >&2
    exit 3
    ;;
esac