# File lib/fog/local/models/files.rb, line 55
        def head(key)
          requires :directory
          path = file_path(key)
          if ::File.exist?(path)
            new({
              :content_length => ::File.size(path),
              :key            => key,
              :last_modified  => ::File.mtime(path)
            })
          else
            nil
          end
        end