unicorn_rails startup script /etc/init.d/unicorn_rails rvm user install version

unicorn_rails.sh

#!/bin/bash
### BEGIN INIT INFO
# Provides:          unicorn_rails
# Required-Start:    $all
# Required-Stop:     $network $local_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start unicorn rails at boot
# Description:       Enable unicorn_rails at boot time.
### END INIT INFO
# 
# Use this as a basis for your own Unicorn init script.
# Change APPLICATION to match your app.
# Make sure that all paths are correct.

#set -u
set -e

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"
      su - $USER -c "$CMD"
      ;;  
    stop)
      sig QUIT && echo "Stopping" && exit 0
      echo >&2 "Not running"
      ;;  
    force-stop)
      sig TERM && echo "Forcing a stop" && exit 0
      echo >&2 "Not running"
      ;;  
    restart|reload)
      sig USR2 && sleep 5 && oldsig QUIT && echo "Killing old master" `cat $OLD_PID` && exit 0
      echo >&2 "Couldn't reload, starting '$CMD' instead"
      $CMD
      ;;  
    upgrade)
      sig USR2 && echo Upgraded && exit 0
      echo >&2 "Couldn't upgrade, starting '$CMD' instead"
      $CMD
      ;;  
    rotate)
            sig USR1 && echo rotated logs OK && exit 0
            echo >&2 "Couldn't rotate logs" && exit 1
            ;;  
    *)  
      echo >&2 "Usage: $0 <start|stop|restart|upgrade|rotate|force-stop>"
      exit 1
      ;;  
    esac
}

setup () {
  echo -n "$RAILS_ROOT: "
  cd $RAILS_ROOT || exit 1
  export PID=$RAILS_ROOT/tmp/pids/unicorn.pid
  export OLD_PID="$PID.oldbin"
  export USER="rails"

  UNICORN_OPTS="-E $RAILS_ENV -c $RAILS_ROOT/config/unicorn/$RAILS_ENV.rb -D"
  GEM_HOME="/home/$USER/.rvm/gems/$RUBY_VERSION"
  SET_PATH="cd $RAILS_ROOT; rvm use $RUBY_VERSION; export GEM_HOME=$GEM_HOME"
  CMD="$SET_PATH; $GEM_HOME/bin/unicorn $UNICORN_OPTS"
}

start_stop () {
  
  # either run the start/stop/reload/etc command for every config under /etc/unicorn
  # or just do it for a specific one

  # $1 contains the start/stop/etc command
  # $2 if it exists, should be the specific config we want to act on
  if [ $2 ]; then
    . $2
    setup
    cmd $1
  else
    for CONFIG in /etc/unicorn_rails/*.conf; do
      # import the variables
      . $CONFIG
      setup

      # run the start/stop/etc command
      cmd $1
    done
   fi
}

ARGS="$1 $2"
start_stop $ARGS