#!/bin/sh

### BEGIN INIT INFO
# Provides:          etherpad-lite
# Required-Start:    $local_fs $remote_fs $network $syslog
# Required-Stop:     $local_fs $remote_fs $network $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts etherpad lite
# Description:       starts etherpad lite using start-stop-daemon
### END INIT INFO

PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/node/bin"
LOGFILE="/var/log/etherpad-lite.log"
EPLITE_DIR="/var/www/etherpad-lite"
EPLITE_BIN="bin/safeRun.sh"
USER="etherpad"
GROUP="etherpad"
DESC="Etherpad Lite"
NAME="etherpad-lite"

# Exit if the package is not installed
[ -x $EPLITE_DIR/$EPLITE_BIN ] || exit 0

# Define LSB log_* functions
. /lib/lsb/init-functions

# Create logfile with proper user if not exists
if [ ! -e $LOGFILE ]; then
    touch $LOGFILE
    chmod 660 $LOGFILE
    chgrp $GROUP $LOGFILE
fi

do_start() {
    start-stop-daemon --start --chuid "$USER:$GROUP" --background --make-pidfile --pidfile /var/run/$NAME.pid --exec $EPLITE_DIR/$EPLITE_BIN -- $LOGFILE || true
}

#We need this function to ensure the whole process tree will be killed
killtree() {
    local _pid=$1
    local _sig=${2-TERM}
    for _child in $(ps -o pid --no-headers --ppid ${_pid}); do
        killtree ${_child} ${_sig}
    done
    kill -${_sig} ${_pid}
}

do_stop() {
    if [ ! -f /var/run/$NAME.pid ]; then
        log_progress_msg "Process not found..."
        return 2
    fi
    while test -d /proc/$(cat /var/run/$NAME.pid); do
         killtree $(cat /var/run/$NAME.pid) 15
         sleep 0.5
    done
    rm /var/run/$NAME.pid
}

do_restart() {
    log_progress_msg "stopping..."
    do_stop
    if [ $? -eq "2" ]; then
        return 2
    fi
    sleep 1
    log_progress_msg "starting..."
    do_start
}

status() {
    status_of_proc -p /var/run/$NAME.pid "" "etherpad-lite" && exit 0 || exit $?
}

case "$1" in
  start)
      log_daemon_msg "Starting $DESC" "$NAME"
      do_start
      case "$?" in
          0|1) log_end_msg 0 ;;
          2) log_end_msg 1 ;;
      esac
      ;;
  stop)
      log_daemon_msg "Stopping $DESC" "$NAME"
      do_stop
      case "$?" in
          0|1) log_end_msg 0 ;;
          2) log_end_msg 1 ;;
      esac
      ;;
  restart)
      log_daemon_msg "Restarting $DESC" "$NAME"
      do_restart
      case "$?" in
          0|1) log_end_msg 0 ;;
          2) log_end_msg 1 ;;
      esac
      ;;
  status)
      status_of_proc -p /var/run/$NAME.pid "$EPLITE_DIR/$EPLITE_BIN" "$NAME" && exit 0 || exit $?
      ;;
  *)
      echo "Usage: $NAME {start|stop|restart|status}" >&2
      exit 1
      ;;
esac