TarOutput is a wrapper to TarWriter that builds gem-format tar file.

Gem-format tar files contain the following files:

data.tar.gz

A gzipped tar file containing the files that compose the gem which will be extracted into the gem/ dir on installation.

metadata.gz

A YAML format Gem::Specification.

data.tar.gz.sig

A signature for the gem's data.tar.gz.

metadata.gz.sig

A signature for the gem's metadata.gz.

See ::open for usage details.

Methods
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Class Public methods
new(io, signer)

Creates a new TarOutput that will write a gem-format tar file to io. If signer is given, the data.tar.gz and metadata.gz will be signed and the signatures will be added to the tar file.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/package/tar_output.rb, line 43
def initialize(io, signer)
  @io = io
  @signer = signer

  @tar_writer = Gem::Package::TarWriter.new @io

  @metadata = nil

  @data_signature = nil
  @meta_signature = nil
end
open(io, signer = nil)

Creates a new TarOutput which will yield a TarWriter object for the data.tar.gz portion of a gem-format tar file.

See initialize for details on io and signer.

See add_gem_contents for details on adding metadata to the tar file.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/package/tar_output.rb, line 28
def self.open(io, signer = nil, &block) # :yield: data_tar_writer
  tar_outputter = new io, signer
  tar_outputter.add_gem_contents(&block)
  tar_outputter.add_metadata
  tar_outputter.add_signatures

ensure
  tar_outputter.close
end
Instance Public methods
add_gem_contents()

Yields a TarWriter for the data.tar.gz inside a gem-format tar file. The yielded TarWriter has been extended with a metadata= method for attaching a YAML format Gem::Specification which will be written by add_metadata.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/package/tar_output.rb, line 61
def add_gem_contents
  @tar_writer.add_file "data.tar.gz", 0644 do |inner|
    sio = @signer ? StringIO.new : nil
    Zlib::GzipWriter.wrap(sio || inner) do |os|

      Gem::Package::TarWriter.new os do |data_tar_writer|
        # :stopdoc:
        def data_tar_writer.metadata() @metadata end
        def data_tar_writer.metadata=(metadata) @metadata = metadata end
        # :startdoc:

        yield data_tar_writer

        @metadata = data_tar_writer.metadata
      end
    end

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

  self
end
add_metadata()

Adds metadata.gz to the gem-format tar file which was saved from a previous add_gem_contents call.

Source: show | on GitHub 

# File ../ruby/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
add_signatures()

Adds data.tar.gz.sig and metadata.gz.sig to the gem-format tar files if a Gem::Security::Signer was sent to initialize.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/package/tar_output.rb, line 123
def add_signatures
  if @data_signature then
    @tar_writer.add_file 'data.tar.gz.sig', 0644 do |io|
      io.write @data_signature
    end
  end

  if @meta_signature then
    @tar_writer.add_file 'metadata.gz.sig', 0644 do |io|
      io.write @meta_signature
    end
  end
end
close()

Closes the TarOutput.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/package/tar_output.rb, line 140
def close
  @tar_writer.close
end