169 lines
3.6 KiB
Ruby
169 lines
3.6 KiB
Ruby
# frozen_string_literal: true
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#--
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# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
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# All rights reserved.
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# See LICENSE.txt for permissions.
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#++
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##
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# The format class knows the guts of the ancient .gem file format and provides
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# the capability to read such ancient gems.
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#
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# Please pretend this doesn't exist.
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class Gem::Package::Old < Gem::Package
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undef_method :spec=
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##
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# Creates a new old-format package reader for +gem+. Old-format packages
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# cannot be written.
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def initialize(gem, security_policy)
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require 'fileutils'
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require 'zlib'
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Gem.load_yaml
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@contents = nil
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@gem = gem
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@security_policy = security_policy
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@spec = nil
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end
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##
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# A list of file names contained in this gem
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def contents
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verify
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return @contents if @contents
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@gem.with_read_io do |io|
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read_until_dashes io # spec
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header = file_list io
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@contents = header.map {|file| file['path'] }
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end
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end
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##
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# Extracts the files in this package into +destination_dir+
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def extract_files(destination_dir)
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verify
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errstr = "Error reading files from gem"
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@gem.with_read_io do |io|
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read_until_dashes io # spec
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header = file_list io
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raise Gem::Exception, errstr unless header
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header.each do |entry|
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full_name = entry['path']
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destination = install_location full_name, destination_dir
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file_data = String.new
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read_until_dashes io do |line|
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file_data << line
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end
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file_data = file_data.strip.unpack("m")[0]
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file_data = Zlib::Inflate.inflate file_data
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raise Gem::Package::FormatError, "#{full_name} in #{@gem} is corrupt" if
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file_data.length != entry['size'].to_i
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FileUtils.rm_rf destination
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FileUtils.mkdir_p File.dirname(destination), :mode => dir_mode && 0755
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File.open destination, 'wb', file_mode(entry['mode']) do |out|
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out.write file_data
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end
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verbose destination
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end
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end
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rescue Zlib::DataError
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raise Gem::Exception, errstr
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end
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##
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# Reads the file list section from the old-format gem +io+
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def file_list(io) # :nodoc:
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header = String.new
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read_until_dashes io do |line|
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header << line
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end
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Gem::SafeYAML.safe_load header
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end
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##
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# Reads lines until a "---" separator is found
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def read_until_dashes(io) # :nodoc:
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while (line = io.gets) && line.chomp.strip != "---" do
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yield line if block_given?
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end
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end
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##
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# Skips the Ruby self-install header in +io+.
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def skip_ruby(io) # :nodoc:
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loop do
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line = io.gets
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return if line.chomp == '__END__'
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break unless line
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end
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raise Gem::Exception, "Failed to find end of Ruby script while reading gem"
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end
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##
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# The specification for this gem
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def spec
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verify
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return @spec if @spec
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yaml = String.new
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@gem.with_read_io do |io|
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skip_ruby io
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read_until_dashes io do |line|
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yaml << line
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end
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end
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begin
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@spec = Gem::Specification.from_yaml yaml
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rescue Psych::SyntaxError
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raise Gem::Exception, "Failed to parse gem specification out of gem file"
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end
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rescue ArgumentError
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raise Gem::Exception, "Failed to parse gem specification out of gem file"
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end
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##
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# Raises an exception if a security policy that verifies data is active.
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# Old format gems cannot be verified as signed.
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def verify
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return true unless @security_policy
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raise Gem::Security::Exception,
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'old format gems do not contain signatures and cannot be verified' if
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@security_policy.verify_data
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true
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end
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end
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