gistfile1.txt

If you get this error:

~/current$ bundle install

Updating git://github.com/rails/rails.git
Fetching source index from http://gemcutter.org
Resolving dependencies
[..]
Installing actionmailer (3.0.0.beta) from git://github.com/rails/rails.git (at master) fatal: destination directory   '/var/www/frontend/.bundle/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master' already exists.
fatal: Not a git repository
An error has occurred in git. Cannot complete bundling.


Then you need to replace the method `Bundler::Souce::Git#checkout` (in `lib/bundler/source.rb`) to read:

  def checkout
    unless File.exists?(File.join(path, '.git'))
      FileUtils.remove_dir(path, force = true)
      %x(git clone --no-checkout #{cache_path} #{path})
    end

    Dir.chdir(path) do
      git "fetch --quiet"
      git "reset --hard #{revision}"
    end
  end