add_contents

# File lib/rubygems/package.rb, line 193
  def add_contents tar # :nodoc:
    digests = tar.add_file_signed 'data.tar.gz', 0444, @signer do |io|
      gzip_to io do |gz_io|
        Gem::Package::TarWriter.new gz_io do |data_tar|
          add_files data_tar
        end
      end
    end

    @checksums['data.tar.gz'] = digests
  end