Unicorn init.d script (for Ubuntu 12.04 LTS)

unicorn

#! /bin/sh

# File: /etc/init.d/unicorn

### BEGIN INIT INFO
# Provides:          unicorn
# 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 the unicorn web server
# Description:       starts unicorn
### END INIT INFO

TIMEOUT=${TIMEOUT-60}

sig () {
  test -s "$PID" && kill -$1 `cat "$PID"`
}

oldsig () {
  test -s "$OLD_PID" && kill -$1 `cat "$OLD_PID"`
}

cmd () {
  case $1 in
    start)
      sig 0 && echo >&2 "Already running" && exit 0
      echo "Starting"
      $CMD
      ;;
    stop)
      sig QUIT && echo "Stopping" && exit 0
      echo >&2 "Not running"
      ;;
    force-stop)
      sig TERM && echo "Force stopping" && exit 0
      echo >&2 "Not running"
      ;;
    restart|reload)
      sig HUP && echo "Reloading" && exit 0
      echo >&2 "Couldn't reload, starting instead"
      $CMD
      ;;
    upgrade)
      printf 'Upgrading...'
      if sig USR2 && sleep 10 && sig 0 && oldsig QUIT
      then
        n=$TIMEOUT
        while test -s $OLD_PID && test $n -ge 0
        do
          printf '.' && sleep 1 && n=$(( $n - 1 ))
        done
        if test $n -lt 0 && test -s $OLD_PID
        then
          echo
          echo >&2 "$OLD_PID still exists after $TIMEOUT seconds"
          exit 1
        fi
        echo "...complete."
        exit 0
      fi
      echo >&2 "Couldn't upgrade, starting instead"
      $CMD
      ;;
    reopen-logs)
      sig USR1
      echo "Reopened logs"
      ;;
    *)
      echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
      exit 1
      ;;
  esac
}

setup () {
  PID=/u/apps/freckle/current/tmp/pids/unicorn.pid
  OLD_PID="$PID.oldbin"
  PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
  export BUNDLE_GEMFILE=/u/apps/freckle/current/Gemfile
  export RUBY_HEAP_MIN_SLOTS=750000
  export RUBY_HEAP_SLOTS_INCREMENT=250000
  export RUBY_HEAP_SLOTS_GROWTH_FACTOR=1
  export RUBY_GC_MALLOC_LIMIT=100000000

  CMD="/usr/local/bin/bundle exec unicorn_rails -c /etc/freckle_production.rb -E production -D"
}

start_stop () {
  setup
  cmd $1
}

ARGS="$1"
start_stop $ARGS