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# -*- coding: utf-8 -*-
#--
# Copyright (C) 2004 Mauricio Julio Fernández Pradier
# See LICENSE.txt for additional licensing information.
#++
##
# 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 TarOutput::open for usage details.
class Gem::Package::TarOutput
##
# 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.
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
##
# 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.
def initialize(io, signer)
@io = io
@signer = signer
@tar_writer = Gem::Package::TarWriter.new @io
@metadata = nil
@data_signature = nil
@meta_signature = nil
end
##
# 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.
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
##
# Adds metadata.gz to the gem-format tar file which was saved from a
# previous #add_gem_contents call.
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
##
# Adds data.tar.gz.sig and metadata.gz.sig to the gem-format tar files if
# a Gem::Security::Signer was sent to initialize.
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
##
# Closes the TarOutput.
def close
@tar_writer.close
end
end