JezK
Edit File: old.rb
# frozen_string_literal: true #-- # Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others. # All rights reserved. # See LICENSE.txt for permissions. #++ ## # The format class knows the guts of the ancient .gem file format and provides # the capability to read such ancient gems. # # Please pretend this doesn't exist. class Gem::Package::Old < Gem::Package undef_method :spec= ## # Creates a new old-format package reader for +gem+. Old-format packages # cannot be written. def initialize gem, security_policy require 'fileutils' require 'zlib' Gem.load_yaml @contents = nil @gem = gem @security_policy = security_policy @spec = nil end ## # A list of file names contained in this gem def contents verify return @contents if @contents @gem.with_read_io do |io| read_until_dashes io # spec header = file_list io @contents = header.map { |file| file['path'] } end end ## # Extracts the files in this package into +destination_dir+ def extract_files destination_dir verify errstr = "Error reading files from gem" @gem.with_read_io do |io| read_until_dashes io # spec header = file_list io raise Gem::Exception, errstr unless header header.each do |entry| full_name = entry['path'] destination = install_location full_name, destination_dir file_data = String.new read_until_dashes io do |line| file_data << line end file_data = file_data.strip.unpack("m")[0] file_data = Zlib::Inflate.inflate file_data raise Gem::Package::FormatError, "#{full_name} in #{@gem} is corrupt" if file_data.length != entry['size'].to_i FileUtils.rm_rf destination FileUtils.mkdir_p File.dirname destination File.open destination, 'wb', entry['mode'] do |out| out.write file_data end verbose destination end end rescue Zlib::DataError raise Gem::Exception, errstr end ## # Reads the file list section from the old-format gem +io+ def file_list io # :nodoc: header = String.new read_until_dashes io do |line| header << line end Gem::SafeYAML.safe_load header end ## # Reads lines until a "---" separator is found def read_until_dashes io # :nodoc: while (line = io.gets) && line.chomp.strip != "---" do yield line if block_given? end end ## # Skips the Ruby self-install header in +io+. def skip_ruby io # :nodoc: loop do line = io.gets return if line.chomp == '__END__' break unless line end raise Gem::Exception, "Failed to find end of Ruby script while reading gem" end ## # The specification for this gem def spec verify return @spec if @spec yaml = String.new @gem.with_read_io do |io| skip_ruby io read_until_dashes io do |line| yaml << line end end yaml_error = if RUBY_VERSION < '1.9' then YAML::ParseError elsif YAML.const_defined?(:ENGINE) && YAML::ENGINE.yamler == 'syck' then YAML::ParseError else YAML::SyntaxError end begin @spec = Gem::Specification.from_yaml yaml rescue yaml_error raise Gem::Exception, "Failed to parse gem specification out of gem file" end rescue ArgumentError raise Gem::Exception, "Failed to parse gem specification out of gem file" end ## # Raises an exception if a security policy that verifies data is active. # Old format gems cannot be verified as signed. def verify return true unless @security_policy raise Gem::Security::Exception, 'old format gems do not contain signatures and cannot be verified' if @security_policy.verify_data true end end