unicorn, rvm and capistrano

deploy.rb

require "rvm/capistrano"                  # Load RVM's capistrano plugin.
require "bundler/capistrano"

set :server, :unicorn
set :unicorn_remote_config, "#{shared_path}/config/unicorn.rb"
set :unicorn_pid, "#{shared_path}/pids/unicorn.pid"

set :rvm_bin_path, "/usr/local/rvm/bin"
set :rvm_type, :system

namespace :deploy do
  task :start do
    run "cd #{current_path} && bundle exec unicorn -c #{unicorn_remote_config} -E #{rails_env} -D"
  end

  task :stop do
    run "kill -QUIT `cat #{unicorn_pid}`"
  end

  task :restart do
    File.exists?(unicorn_pid) ? run("kill -USR2 `cat #{unicorn_pid}`") : start
  end
end