gistfile1.rb

  task :deploy, :roles => :live_web do
    set(:deploy_tag) do
      Capistrano::CLI.ui.ask "Tag to deploy to: "
    end
    die 'Tag must be longer than 4 characters' unless deploy_tag.length > 4
    `cd #{RAILS_ROOT} && ruby vendor/plugins/newrelic_rpm/bin/newrelic_cmd deployments -e production -r #{deploy_tag}`
    do_deploy
  end

  serial_task :do_deploy, :roles => :live_web do
  . . .
    checkout(deploy_tag)
  . . .
  end

  def checkout(tag)
    run "cd #{COMPOSTUS_DIR}; git fetch", &git_stream_handler(self)
    run "cd #{COMPOSTUS_DIR}; git checkout #{tag};", &git_stream_handler(self)
  end

(git_stream_handler isn't necessary anymore, but we haven't removed it yet.)