add_metadata

# File lib/rubygems/package/tar_output.rb, line 95
  def add_metadata
    return if @metadata.nil?

    @tar_writer.add_file "metadata.gz", 0644 do |io|
      begin
        sio = @signer ? StringIO.new : nil
        gzos = Zlib::GzipWriter.new(sio || io)
        gzos.write @metadata
      ensure
        gzos.flush
        gzos.finish

        # if we have a signing key, then sign the metadata digest and return
        # the signature
        if @signer then
          require 'rubygems/security'
          digest = Gem::Security::OPT[:dgst_algo].digest sio.string
          @meta_signature = @signer.sign digest
          io.write sio.string
        end
      end
    end
  end