class Bundler::Source::Path

def cache(spec, custom_path = nil)
  app_cache_path = app_cache_path(custom_path)
  return unless Bundler.settings[:cache_all]
  return if expand(@original_path).to_s.index(Bundler.root.to_s + "/") == 0
  unless @original_path.exist?
    raise GemNotFound, "Can't cache gem #{version_message(spec)} because #{self} is missing!"
  end
  FileUtils.rm_rf(app_cache_path)
  FileUtils.cp_r("#{@original_path}/.", app_cache_path)
  FileUtils.touch(app_cache_path.join(".bundlecache"))
end