class Bundler::Source::Git

def cache(spec, custom_path = nil)
  app_cache_path = app_cache_path(custom_path)
  return unless Bundler.settings[:cache_all]
  return if path == app_cache_path
  cached!
  FileUtils.rm_rf(app_cache_path)
  git_proxy.checkout if requires_checkout?
  git_proxy.copy_to(app_cache_path, @submodules)
  serialize_gemspecs_in(app_cache_path)
end