add some things

lib/cap-pack.rb

@@ -13,6 +13,24 @@ Capistrano::Configuration.instance.load do
     ENV['HOST'] || find_servers_for_task(current_task).first
   end
 
+  def switch_user(new_user)
+    old_user = user
+    set :user, new_user
+    close_sessions
+    yield
+    set :user, old_user
+    close_sessions
+  end
+
+  def close_sessions
+    sessions.values.each { |session| session.close }
+    sessions.clear
+  end
+
+  def rake(cmd, env = {})
+    run "cd #{latest_release} && RAILS_ENV=#{rails_env} #{env.collect { |k, v| "#{k}=#{v}" }.join(' ')} bundle exec rake #{cmd}"
+  end
+
   Dir[File.expand_path('../cap-pack/recipes/**/*.rb', __FILE__)].each { |f| load f }
 end