Diff last commit on Beanstalk server with local head

bean.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'beanstalkapp'

Beanstalk::API::Base.setup(
  :domain   => "your_beanstalk_account_subdomain",
  :login    => "login",
  :password => ENV['BEANSTALK_PW']
)

master = Beanstalk::API::ServerEnvironment.find_for_repository(environment_id, "repo");
hash = master.current_version
p "Production on #{hash}"
`git difftool #{hash} head`