RVM w/ multiple rubies + multiple Unicorns

app.sh

#!/bin/bash
#
# Unicorn application launcher

# Load the env config and RVM
. /etc/unicorn/$1.conf 
. /usr/local/rvm/scripts/rvm

# Switch to the proper ruby
rvm use $RUBY

cd $RAILS_ROOT

if [[ $RUBY =~ "1.8.7" ]]; then
  UNICORN=unicorn_rails
else
  UNICORN=unicorn
fi

# Start unicorn
$UNICORN -e "ENV['RAILS_ROOT']='$RAILS_ROOT'" -c /etc/unicorn/unicorn.rb -E $RAILS_ENV -D

rails3.conf

RUBY=ruby-1.9.2-p0
RAILS_ROOT=/var/www/rails3_example
RAILS_ENV=development
CMD="/etc/unicorn/app.sh rails3_example"

redmine.conf

RUBY=ree-1.8.7-2010.02
RAILS_ROOT=/var/www/redmine
RAILS_ENV=production
CMD="/etc/unicorn/app.sh redmine"

unicorn

#!/bin/sh
#
# chkconfig:   - 85 15
# description: Unicorn init script for single or multiple unicorn installations.
#              Expects at least one .conf file in /etc/unicorn
#
# Modified by jgelo@hoptsolutions.com http://github.com/jgelo
# Modified by jay@gooby.org http://github.com/jaygooby
# based on http://gist.github.com/308216 by http://github.com/mguterl
#
# If you call this script without any config parameters, it will attempt to run the
# init command for all your unicorn configurations listed in /etc/unicorn/*.conf
#
# Start all unicorns - 
# /etc/init.d/unicorn start 
#
# Start a particular unicorn -
# /etc/init.d/unicorn start /etc/unicorn/my_app.conf

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"
      $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"

  # CMD is read from the conf file
  # CMD="/usr/bin/unicorn_rails -c config/unicorn.rb -E $RAILS_ENV -D"
}

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/*.conf; do
      # import the variables
      . $CONFIG
      setup

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

ARGS="$1 $2"
start_stop $ARGS