    # File lib/fog/local/models/storage/files.rb, line 59
            def head(key)
              requires :directory
              path = file_path(key)
              if ::File.exists?(path)
                new({
                  :content_length => ::File.size(path),
                  :key            => key,
                  :last_modified  => ::File.mtime(path)
                })
              else
                nil
              end
            end