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Class: Gem::Package::Old

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::Gem::Package
Instance Chain:
self, ::Gem::Package, ::Gem::UserInteraction, ::Gem::DefaultUserInteraction
Inherits: Gem::Package
Defined in: lib/rubygems/package/old.rb

Overview

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 Method Summary

::Gem::Package - Inherited

.build,
.new

Creates a new ::Gem::Package for the file at gem.

Instance Attribute Summary

::Gem::Package - Inherited

#security_policy

The security policy used for verifying the contents of this package.
#spec

The spec for this gem.
#spec=

Sets the ::Gem::Specification to use to build this package.
#checksums

Checksums for the contents of the package.
#files

The files in this package.

::Gem::DefaultUserInteraction - Included

#ui

See DefaultUserInteraction.ui
#ui=

See DefaultUserInteraction.ui=

Instance Method Summary

::Gem::Package - Inherited

#add_checksums

Adds a checksum for each entry in the gem to checksums.yaml.gz.
#build

Builds this package based on the specification set by #spec=
#contents

A list of file names contained in this gem.
#extract_files

Extracts the files in this package into destination_dir
#gzip_to

Gzips content written to gz_io to io.
#initialize

Creates a new package that will read or write to the file gem.
#read_checksums

Reads and loads checksums.yaml.gz from the tar file gem
#setup_signer

Prepares the gem for signing and checksum generation.
#verify

Verifies that this gem:
#verify_entry

Verifies entry in a .gem file.
#verify_files

Verifies the files of the gem

::Gem::UserInteraction - Included

#alert

Displays an alert statement.
#alert_error

Displays an error statement to the error output location.
#alert_warning

Displays a warning statement to the warning output location.
#ask

Asks a question and returns the answer.
#ask_for_password

Asks for a password with a prompt
#ask_yes_no

Asks a yes or no question.
#choose_from_list

Asks the user to answer question with an answer from the given list.
#say

Displays the given statement on the standard output (or equivalent).
#terminate_interaction

Terminates the RubyGems process with the given exit_code
#verbose

Calls say with msg or the results of the block if really_verbose is true.

::Gem::DefaultUserInteraction - Included

#use_ui

See DefaultUserInteraction.use_ui

Constructor Details

.new(gem) ⇒ Old

Creates a new old-format package reader for gem. Old-format packages cannot be written.

[ GitHub ] 

  


# File 'lib/rubygems/package/old.rb', line 21



def initialize gem
  require 'fileutils'
  require 'zlib'
  Gem.load_yaml

  @contents        = nil
  @gem             = gem
  @security_policy = nil
  @spec            = nil
end


  







Instance Method Details



  

    #contents  
  



  

    

A list of file names contained in this gem


  



  [ GitHub ]


  

  


# File 'lib/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


  








  

    #extract_files(destination_dir)  
  



  

    

Extracts the files in this package into destination_dir


  



  [ GitHub ]


  

  


# File 'lib/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 = ''

      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

      open destination, 'wb', entry['mode'] do |out|
        out.write file_data
      end

      verbose destination
    end
  end
rescue Zlib::DataError
  raise Gem::Exception, errstr
end


  








  

    #spec  
  



  

    

The specification for this gem


  



  [ GitHub ]


  

  


# File 'lib/rubygems/package/old.rb', line 132



def spec
  verify

  return @spec if @spec

  yaml = ''

  @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


  








  

    #verify  
  



  

    

Raises an exception if a security policy that verifies data is active. Old format gems cannot be verified as signed.


  





  
Raises:





  [ GitHub ]


  

  


# File 'lib/rubygems/package/old.rb', line 167



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