Class: Gem::Package

Inherits:
Object
  • Object
show all
Includes:
UserInteraction
Defined in:
lib/rubygems/package.rb

Direct Known Subclasses

Old

Defined Under Namespace

Classes: DigestIO, Error, FileSource, FormatError, IOSource, NonSeekableIO, Old, PathError, Source, TarHeader, TarInvalidError, TarReader, TarTestCase, TarWriter, TooLongFileName

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from UserInteraction

#alert, #alert_error, #alert_warning, #ask, #ask_for_password, #ask_yes_no, #choose_from_list, #say, #terminate_interaction, #verbose

Methods included from DefaultUserInteraction

ui, #ui, ui=, #ui=, use_ui, #use_ui

Constructor Details

#initialize(gem) ⇒ Package

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



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# File 'lib/rubygems/package.rb', line 147

def initialize gem # :notnew:
  @gem = gem

  @build_time      = Time.now
  @checksums       = {}
  @contents        = nil
  @digests         = Hash.new { |h, algorithm| h[algorithm] = {} }
  @files           = nil
  @security_policy = nil
  @signatures      = {}
  @signer          = nil
  @spec            = nil
end

Instance Attribute Details

#build_time ⇒ Object

:nodoc:



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# File 'lib/rubygems/package.rb', line 86

def build_time
  @build_time
end

#checksums ⇒ Object (readonly)

Checksums for the contents of the package



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# File 'lib/rubygems/package.rb', line 91

def checksums
  @checksums
end

#files ⇒ Object (readonly)

The files in this package. This is not the contents of the gem, just the files in the top-level container.



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

def files
  @files
end

#security_policy ⇒ Object

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



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# File 'lib/rubygems/package.rb', line 102

def security_policy
  @security_policy
end

#spec ⇒ Object

The spec for this gem.

If this is a package for a built gem the spec is loaded from the gem and returned. If this is a package for a gem being built the provided spec is returned.



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# File 'lib/rubygems/package.rb', line 484

def spec
  verify unless @spec

  @spec
end

Class Method Details

.build(spec, skip_validation = false) ⇒ Object 



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# File 'lib/rubygems/package.rb', line 109

def self.build spec, skip_validation=false
  gem_file = spec.file_name

  package = new gem_file
  package.spec = spec
  package.build skip_validation

  gem_file
end

.new(gem) ⇒ Object

Creates a new Gem::Package for the file at gem. gem can also be provided as an IO object.

If gem is an existing file in the old format a Gem::Package::Old will be returned.



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# File 'lib/rubygems/package.rb', line 126

def self.new gem
  gem = if gem.is_a?(Gem::Package::Source)
          gem
        elsif gem.respond_to? :read
          Gem::Package::IOSource.new gem
        else
          Gem::Package::FileSource.new gem
        end

  return super(gem) unless Gem::Package == self
  return super unless gem.present?

  return super unless gem.start
  return super unless gem.start.include? 'MD5SUM ='

  Gem::Package::Old.new gem
end

Instance Method Details

#add_checksums(tar) ⇒ Object

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



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# File 'lib/rubygems/package.rb', line 164

def add_checksums tar
  Gem.load_yaml

  checksums_by_algorithm = Hash.new { |h, algorithm| h[algorithm] = {} }

  @checksums.each do |name, digests|
    digests.each do |algorithm, digest|
      checksums_by_algorithm[algorithm][name] = digest.hexdigest
    end
  end

  tar.add_file_signed 'checksums.yaml.gz', 0444, @signer do |io|
    gzip_to io do |gz_io|
      YAML.dump checksums_by_algorithm, gz_io
    end
  end
end

#add_contents(tar) ⇒ Object

Adds the files listed in the packages’s Gem::Specification to data.tar.gz and adds this file to the tar.



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# File 'lib/rubygems/package.rb', line 186

def add_contents tar # :nodoc:
  digests = tar.add_file_signed 'data.tar.gz', 0444, @signer do |io|
    gzip_to io do |gz_io|
      Gem::Package::TarWriter.new gz_io do |data_tar|
        add_files data_tar
      end
    end
  end

  @checksums['data.tar.gz'] = digests
end

#add_files(tar) ⇒ Object

Adds files included the package’s Gem::Specification to the tar file



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# File 'lib/rubygems/package.rb', line 201

def add_files tar # :nodoc:
  @spec.files.each do |file|
    stat = File.stat file

    next unless stat.file?

    tar.add_file_simple file, stat.mode, stat.size do |dst_io|
      open file, 'rb' do |src_io|
        dst_io.write src_io.read 16384 until src_io.eof?
      end
    end
  end
end

#add_metadata(tar) ⇒ Object

Adds the package’s Gem::Specification to the tar file



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# File 'lib/rubygems/package.rb', line 218

def add_metadata tar # :nodoc:
  digests = tar.add_file_signed 'metadata.gz', 0444, @signer do |io|
    gzip_to io do |gz_io|
      gz_io.write @spec.to_yaml
    end
  end

  @checksums['metadata.gz'] = digests
end

#build(skip_validation = false) ⇒ Object

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



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# File 'lib/rubygems/package.rb', line 231

def build skip_validation = false
  Gem.load_yaml
  require 'rubygems/security'

  @spec.mark_version
  @spec.validate unless skip_validation

  setup_signer

  @gem.with_write_io do |gem_io|
    Gem::Package::TarWriter.new gem_io do |gem|
      add_metadata gem
      add_contents gem
      add_checksums gem
    end
  end

  say <<-EOM
Successfully built RubyGem
Name: #{@spec.name}
Version: #{@spec.version}
File: #{File.basename @spec.cache_file}
EOM
ensure
  @signer = nil
end

#contents ⇒ Object

A list of file names contained in this gem



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# File 'lib/rubygems/package.rb', line 261

def contents
  return @contents if @contents

  verify unless @spec

  @contents = []

  @gem.with_read_io do |io|
    gem_tar = Gem::Package::TarReader.new io

    gem_tar.each do |entry|
      next unless entry.full_name == 'data.tar.gz'

      open_tar_gz entry do |pkg_tar|
        pkg_tar.each do |contents_entry|
          @contents << contents_entry.full_name
        end
      end

      return @contents
    end
  end
end

#digest(entry) ⇒ Object

Creates a digest of the TarEntry entry from the digest algorithm set by the security policy.



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# File 'lib/rubygems/package.rb', line 289

def digest entry # :nodoc:
  algorithms = if @checksums then
                 @checksums.keys
               else
                 [Gem::Security::DIGEST_NAME].compact
               end

  algorithms.each do |algorithm|
    digester =
      if defined?(OpenSSL::Digest) then
        OpenSSL::Digest.new algorithm
      else
        Digest.const_get(algorithm).new
      end

    digester << entry.read(16384) until entry.eof?

    entry.rewind

    @digests[algorithm][entry.full_name] = digester
  end

  @digests
end

#extract_files(destination_dir, pattern = "*") ⇒ Object

Extracts the files in this package into destination_dir

If pattern is specified, only entries matching that glob will be extracted.



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# File 'lib/rubygems/package.rb', line 320

def extract_files destination_dir, pattern = "*"
  verify unless @spec

  FileUtils.mkdir_p destination_dir

  @gem.with_read_io do |io|
    reader = Gem::Package::TarReader.new io

    reader.each do |entry|
      next unless entry.full_name == 'data.tar.gz'

      extract_tar_gz entry, destination_dir, pattern

      return # ignore further entries
    end
  end
end

#extract_tar_gz(io, destination_dir, pattern = "*") ⇒ Object

Extracts all the files in the gzipped tar archive io into destination_dir.

If an entry in the archive contains a relative path above destination_dir or an absolute path is encountered an exception is raised.

If pattern is specified, only entries matching that glob will be extracted.



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# File 'lib/rubygems/package.rb', line 349

def extract_tar_gz io, destination_dir, pattern = "*" # :nodoc:
  open_tar_gz io do |tar|
    tar.each do |entry|
      next unless File.fnmatch pattern, entry.full_name, File::FNM_DOTMATCH

      destination = install_location entry.full_name, destination_dir

      FileUtils.rm_rf destination

      mkdir_options = {}
      mkdir_options[:mode] = entry.header.mode if entry.directory?
      mkdir =
        if entry.directory? then
          destination
        else
          File.dirname destination
        end

      FileUtils.mkdir_p mkdir, mkdir_options

      open destination, 'wb' do |out|
        out.write entry.read
        FileUtils.chmod entry.header.mode, destination
      end if entry.file?

      verbose destination
    end
  end
end

#gzip_to(io) ⇒ Object

Gzips content written to gz_io to io. – Also sets the gzip modification time to the package build time to ease testing.



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# File 'lib/rubygems/package.rb', line 385

def gzip_to io # :yields: gz_io
  gz_io = Zlib::GzipWriter.new io, Zlib::BEST_COMPRESSION
  gz_io.mtime = @build_time

  yield gz_io
ensure
  gz_io.close
end

#install_location(filename, destination_dir) ⇒ Object

Returns the full path for installing filename.

If filename is not inside destination_dir an exception is raised.

Raises:



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# File 'lib/rubygems/package.rb', line 399

def install_location filename, destination_dir # :nodoc:
  raise Gem::Package::PathError.new(filename, destination_dir) if
    filename.start_with? '/'

  destination_dir = File.realpath destination_dir if
    File.respond_to? :realpath
  destination_dir = File.expand_path destination_dir

  destination = File.join destination_dir, filename
  destination = File.expand_path destination

  raise Gem::Package::PathError.new(destination, destination_dir) unless
    destination.start_with? destination_dir

  destination.untaint
  destination
end

#load_spec(entry) ⇒ Object

Loads a Gem::Specification from the TarEntry entry



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# File 'lib/rubygems/package.rb', line 420

def load_spec entry # :nodoc:
  case entry.full_name
  when 'metadata' then
    @spec = Gem::Specification.from_yaml entry.read
  when 'metadata.gz' then
    args = [entry]
    args << { :external_encoding => Encoding::UTF_8 } if
      Object.const_defined?(:Encoding) &&
        Zlib::GzipReader.method(:wrap).arity != 1

    Zlib::GzipReader.wrap(*args) do |gzio|
      @spec = Gem::Specification.from_yaml gzio.read
    end
  end
end

#open_tar_gz(io) ⇒ Object

Opens io as a gzipped tar archive



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# File 'lib/rubygems/package.rb', line 439

def open_tar_gz io # :nodoc:
  Zlib::GzipReader.wrap io do |gzio|
    tar = Gem::Package::TarReader.new gzio

    yield tar
  end
end

#read_checksums(gem) ⇒ Object

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



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# File 'lib/rubygems/package.rb', line 450

def read_checksums gem
  Gem.load_yaml

  @checksums = gem.seek 'checksums.yaml.gz' do |entry|
    Zlib::GzipReader.wrap entry do |gz_io|
      YAML.load gz_io.read
    end
  end
end

#setup_signer ⇒ Object

Prepares the gem for signing and checksum generation. If a signing certificate and key are not present only checksum generation is set up.



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# File 'lib/rubygems/package.rb', line 464

def setup_signer
  passphrase = ENV['GEM_PRIVATE_KEY_PASSPHRASE']
  if @spec.signing_key then
    @signer = Gem::Security::Signer.new @spec.signing_key, @spec.cert_chain, passphrase
    @spec.signing_key = nil
    @spec.cert_chain = @signer.cert_chain.map { |cert| cert.to_s }
  else
    @signer = Gem::Security::Signer.new nil, nil, passphrase
    @spec.cert_chain = @signer.cert_chain.map { |cert| cert.to_pem } if
      @signer.cert_chain
  end
end

#verify ⇒ Object

Verifies that this gem:

  • Contains a valid gem specification

  • Contains a contents archive

  • The contents archive is not corrupt

After verification the gem specification from the gem is available from #spec



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# File 'lib/rubygems/package.rb', line 500

def verify
  @files     = []
  @spec      = nil

  @gem.with_read_io do |io|
    Gem::Package::TarReader.new io do |reader|
      read_checksums reader

      verify_files reader
    end
  end

  verify_checksums @digests, @checksums

  @security_policy.verify_signatures @spec, @digests, @signatures if
    @security_policy

  true
rescue Gem::Security::Exception
  @spec = nil
  @files = []
  raise
rescue Errno::ENOENT => e
  raise Gem::Package::FormatError.new e.message
rescue Gem::Package::TarInvalidError => e
  raise Gem::Package::FormatError.new e.message, @gem
end

#verify_checksums(digests, checksums) ⇒ Object

Verifies the checksums against the digests. This check is not cryptographically secure. Missing checksums are ignored.



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# File 'lib/rubygems/package.rb', line 532

def verify_checksums digests, checksums # :nodoc:
  return unless checksums

  checksums.sort.each do |algorithm, gem_digests|
    gem_digests.sort.each do |file_name, gem_hexdigest|
      computed_digest = digests[algorithm][file_name]

      unless computed_digest.hexdigest == gem_hexdigest then
        raise Gem::Package::FormatError.new \
          "#{algorithm} checksum mismatch for #{file_name}", @gem
      end
    end
  end
end

#verify_entry(entry) ⇒ Object

Verifies entry in a .gem file.



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# File 'lib/rubygems/package.rb', line 550

def verify_entry entry
  file_name = entry.full_name
  @files << file_name

  case file_name
  when /\.sig$/ then
    @signatures[$`] = entry.read if @security_policy
    return
  else
    digest entry
  end

  case file_name
  when /^metadata(.gz)?$/ then
    load_spec entry
  when 'data.tar.gz' then
    verify_gz entry
  end
rescue => e
  message = "package is corrupt, exception while verifying: " +
            "#{e.message} (#{e.class})"
  raise Gem::Package::FormatError.new message, @gem
end

#verify_files(gem) ⇒ Object

Verifies the files of the gem



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# File 'lib/rubygems/package.rb', line 577

def verify_files gem
  gem.each do |entry|
    verify_entry entry
  end

  unless @spec then
    raise Gem::Package::FormatError.new 'package metadata is missing', @gem
  end

  unless @files.include? 'data.tar.gz' then
    raise Gem::Package::FormatError.new \
            'package content (data.tar.gz) is missing', @gem
  end
end

#verify_gz(entry) ⇒ Object

Verifies that entry is a valid gzipped file.



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# File 'lib/rubygems/package.rb', line 595

def verify_gz entry # :nodoc:
  Zlib::GzipReader.wrap entry do |gzio|
    gzio.read 16384 until gzio.eof? # gzip checksum verification
  end
rescue Zlib::GzipFile::Error => e
  raise Gem::Package::FormatError.new(e.message, entry.full_name)
end