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.
Creates a new old-format package reader for gem
. Old-format packages cannot be written.
# File rubygems/package/old.rb, line 21 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
# File rubygems/package/old.rb, line 35 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
# File rubygems/package/old.rb, line 51 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), :mode => dir_mode && 0755 File.open destination, 'wb', file_mode(entry['mode']) do |out| out.write file_data end verbose destination end end rescue Zlib::DataError raise Gem::Exception, errstr end
The specification for this gem
# File rubygems/package/old.rb, line 132 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 begin @spec = Gem::Specification.from_yaml yaml rescue YAML::SyntaxError 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.
# File rubygems/package/old.rb, line 159 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