A Capistrano Recipe using Git as the folder structure, not just the scm.

gistfile1.rb

# you'd obviously have more settings somewhere
set :repository, "[email protected]:defunkt/github.git"
set :branch,     "origin/master"

namespace :deploy do
  desc "Deploy the MFer"
  task :default do
    update
    restart
    cleanup
  end

  desc "Setup a GitHub-style deployment."
  task :setup, :except => { :no_release => true } do
    run "git clone #{repository} #{current_path}"
  end

  desc "Update the deployed code."
  task :update_code, :except => { :no_release => true } do
    run "cd #{current_path}; git fetch origin; git reset --hard #{branch}"
  end

  desc "Rollback a single commit."
  task :rollback, :except => { :no_release => true } do
    set :branch, "HEAD^"
    default
  end
end