unicorn init script for a system wide rvm (app runs under ubuntu user and is configured with pid in tmp, can be tweaked)

unicorn_init.sh

#!/bin/sh
### BEGIN INIT INFO
# Provides:          unicorn
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      S 0 1 6
# Short-Description: unicorn initscript
# Description:       unicorn
### END INIT INFO

# start the app
cd /home/ubuntu/app


SCRIPT_NAME=/etc/init.d/unicorn

case "$1" in
  start)
        sudo su -c "source '/usr/local/rvm/scripts/rvm'; unicorn -c config/unicorn.rb -D -E production" ubuntu
        ;;
  stop)
        sudo su -c "kill -s QUIT `cat /tmp/unicorn.pid`" ubuntu
        ;;
  restart)
	stop
	start
        ;;
  *)
        echo "Usage: $SCRIPT_NAME {start|stop|restart}" >&2
        exit 3
        ;;
esac