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`, `::Gem::Text`
Inherits:	Gem::Package Object Gem::Package Gem::Package::Old
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

.new(gem, security_policy) ⇒ Old constructor

Creates a new old-format package reader for #gem.

`::Gem::Package` - Inherited

.build,
.new	Creates a new `::Gem::Package` for the file at #gem.
.raw_spec	Extracts the `::Gem::Specification` and raw metadata from the #gem file at Gem.path.

Instance Attribute Summary

`::Gem::Package` - Inherited

#checksums	Checksums for the contents of the package.
#data_mode	Permission for other files.
#dir_mode	Permission for directories.
#files	The files in this package.
#gem	Reference to the gem being packaged.
#prog_mode	Permission for program files.
#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.
#build_time

`::Gem::DefaultUserInteraction` - Included

#ui	See DefaultUserInteraction.ui
#ui=	See DefaultUserInteraction.ui=

Instance Method Summary

#contents

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

Extracts the files in this package into destination_dir
#spec

The specification for this gem.
#verify

Raises an exception if a security policy that verifies data is active.
#file_list(io) Internal use only

Reads the file list section from the old-format gem io
#read_until_dashes(io) Internal use only

Reads lines until a “—” separator is found.
#skip_ruby(io) Internal use only

Skips the Ruby self-install header in io.

`::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.
#copy_to	Copies this package to Gem.path (if possible).
#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.
#mkdir_p_safe, #normalize_path,
#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
#add_contents	Adds the files listed in the packages’s `::Gem::Specification` to data.tar.gz and adds this file to the `tar`.
#add_files	Adds files included the package’s `::Gem::Specification` to the `tar` file.
#add_metadata	Adds the package’s `::Gem::Specification` to the `tar` file.
#digest	Creates a digest of the TarEntry `entry` from the digest algorithm set by the security policy.
#extract_tar_gz	Extracts all the files in the gzipped tar archive `io` into `destination_dir`.
#file_mode,
#install_location	Returns the full path for installing `filename`.
#load_spec	Loads a `::Gem::Specification` from the TarEntry `entry`
#open_tar_gz	Opens `io` as a gzipped tar archive.
#verify_checksums	Verifies the #checksums against the `digests`.
#verify_gz	Verifies that `entry` is a valid gzipped file.

`::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

`::Gem::Text` - Included

#clean_text	Remove any non-printable characters and make the text suitable for printing.
#format_text	Wraps `text` to `wrap` characters and optionally indents by `indent` characters.
#levenshtein_distance	This code is based directly on the `::Gem::Text` gem implementation Returns a value representing the “cost” of transforming str1 into str2.
#truncate_text, #min3

Constructor Details

.new(gem, security_policy) ⇒ `Old`

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

[ GitHub ]

# File 'lib/rubygems/package/old.rb', line 22


def initialize(gem, security_policy)
  require 'fileutils'
  require 'zlib'
  Gem.load_yaml

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

Instance Method Details

#contents

A list of file names contained in this gem

[ GitHub ]

# File 'lib/rubygems/package/old.rb', line 36


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 52


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

#file_list(io)

This method is for internal use only.

Reads the file list section from the old-format gem io

[ GitHub ]

# File 'lib/rubygems/package/old.rb', line 97


def file_list(io) # :nodoc:
  header = String.new

  read_until_dashes io do |line|
    header << line
  end

  Gem::SafeYAML.safe_load header
end

#read_until_dashes(io)

This method is for internal use only.

Reads lines until a “—” separator is found

[ GitHub ]

# File 'lib/rubygems/package/old.rb', line 110


def read_until_dashes(io) # :nodoc:
  while (line = io.gets) && line.chomp.strip != "---" do
    yield line if block_given?
  end
end

#skip_ruby(io)

This method is for internal use only.

Skips the Ruby self-install header in io.

Raises:

(Gem::Exception)

[ GitHub ]

# File 'lib/rubygems/package/old.rb', line 119


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

#spec

The specification for this gem

[ GitHub ]

# File 'lib/rubygems/package/old.rb', line 133


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

#verify

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

Raises:

(Gem::Security::Exception)

[ GitHub ]

# File 'lib/rubygems/package/old.rb', line 160


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

Class: Gem::Package::Old

Overview

Class Method Summary

::Gem::Package - Inherited

Instance Attribute Summary

::Gem::Package - Inherited

::Gem::DefaultUserInteraction - Included

Instance Method Summary

::Gem::Package - Inherited

::Gem::UserInteraction - Included

::Gem::DefaultUserInteraction - Included

::Gem::Text - Included

Constructor Details

.new(gem, security_policy) ⇒ Old

Instance Method Details

#contents

#extract_files(destination_dir)

#file_list(io)

#read_until_dashes(io)

#skip_ruby(io)

#spec

#verify

`::Gem::Package` - Inherited

`::Gem::Package` - Inherited

`::Gem::DefaultUserInteraction` - Included

`::Gem::Package` - Inherited

`::Gem::UserInteraction` - Included

`::Gem::DefaultUserInteraction` - Included

`::Gem::Text` - Included

.new(gem, security_policy) ⇒ `Old`