Init script for grunt apps

gruntapp

#!/bin/sh
APP_DIR='/path/to/gruntapp/home';
CMD="/usr/local/bin/grunt"
CMD_ARGS="server --base $APP_DIR --gruntfile $APP_DIR/Gruntfile.js"
PID_FILE=$APP_DIR/app.pid
LOG_FILE=$APP_DIR/app.log
USER="appuser"
GROUP="appgroup"

set -e

. /lib/lsb/init-functions

start_app (){
    if [ -f $PID_FILE ]
    then
        echo "$PID_FILE exists, process is already running or crashed"
        exit 1
    else
        echo "Starting node app..."
        start-stop-daemon -v --start --chuid "$USER:$GROUP" --background --pidfile $PID_FILE -d $APP_DIR --exec $CMD -- $CMD_ARGS 1>$LOG_FILE 2>$LOG_FILE
    fi
}

stop_app (){
    if [ ! -f $PID_FILE ]
    then
        echo "$PID_FILE does not exist, process is not running"
        exit 1
    else
        echo "Stopping $APP_DIR/$NODE_APP $CMD ..."
        echo "Killing `cat $PID_FILE`"
        kill `cat $PID_FILE`;
        rm -f $PID_FILE;
        echo "Node stopped"
    fi
}

#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}
}

status() {
  status_of_proc -p $PID_FILE "" "gruntapp" && exit 0 || exit $?
}

case "$1" in
    start)
        start_app
    ;;

    stop)
        stop_app
    ;;

    restart)
        stop_app
        start_app
    ;;

    status)
	status
    ;;

    *)
        echo "Usage: $0 {start|stop|restart|status}"
        exit 1
    ;;
esac