# class Gem::Package

### Attributes

checksums[R]

Checksums for the contents of the package

data_mode[RW]

Permission for other files

dir_mode[RW]

Permission for directories

files[R]

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

gem[R]

Reference to the gem being packaged.

prog_mode[RW]

Permission for program files

security_policy[RW]

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

spec[W]

Sets the `Gem::Specification` to use to build this package.

### Public Class Methods

build(spec, skip_validation = false, strict_validation = false, file_name = nil) click to toggle source

    # File lib/rubygems/package.rb, line 123
    def self.build(spec, skip_validation = false, strict_validation = false, file_name = nil)
      gem_file = file_name || spec.file_name

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

      gem_file
    end

new(gem, security_policy = nil) click to toggle source

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.

Calls superclass method `BasicObject::new`

    # File lib/rubygems/package.rb, line 140
    def self.new(gem, security_policy = nil)
      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 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

raw_spec(path, security_policy = nil) click to toggle source

Extracts the `Gem::Specification` and raw metadata from the .gem file at `path`.

    # File lib/rubygems/package.rb, line 163
    def self.raw_spec(path, security_policy = nil)
      format = new(path, security_policy)
      spec = format.spec

      metadata = nil

      File.open path, Gem.binary_mode do |io|
        tar = Gem::Package::TarReader.new io
        tar.each_entry do |entry|
          case entry.full_name
          when 'metadata' then
            metadata = entry.read
          when 'metadata.gz' then
            metadata = Gem::Util.gunzip entry.read
          end
        end
      end

      return spec, metadata
    end

### Public Instance Methods

add_checksums(tar) click to toggle source

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

    # File lib/rubygems/package.rb, line 213
    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

build(skip_validation = false, strict_validation = false) click to toggle source

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

    # File lib/rubygems/package.rb, line 291
      def build(skip_validation = false, strict_validation = false)
        raise ArgumentError, "skip_validation = true and strict_validation = true are incompatible" if skip_validation && strict_validation

        Gem.load_yaml

        @spec.mark_version
        @spec.validate true, strict_validation unless skip_validation

        setup_signer(
          signer_options: {
            expiration_length_days: Gem.configuration.cert_expiration_length_days,
          }
        )

        @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 @gem.path}
    EOM
      ensure
        @signer = nil
      end

contents() click to toggle source

A list of file names contained in this gem

    # File lib/rubygems/package.rb, line 326
    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

copy_to(path) click to toggle source

Copies this package to `path` (if possible)

    # File lib/rubygems/package.rb, line 206
    def copy_to(path)
      FileUtils.cp @gem.path, path unless File.exist? path
    end

extract_files(destination_dir, pattern = "*") click to toggle source

Extracts the files in this package into `destination_dir`

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

    # File lib/rubygems/package.rb, line 380
    def extract_files(destination_dir, pattern = "*")
      verify unless @spec

      FileUtils.mkdir_p destination_dir, :mode => dir_mode && 0755

      @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

gzip_to(io) { |gz_io| ... } click to toggle source

Gzips content written to `gz_io` to `io`.

    # File lib/rubygems/package.rb, line 458
    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

mkdir_p_safe(mkdir, mkdir_options, destination_dir, file_name) click to toggle source

    # File lib/rubygems/package.rb, line 504
    def mkdir_p_safe(mkdir, mkdir_options, destination_dir, file_name)
      destination_dir = File.realpath(File.expand_path(destination_dir))
      parts = mkdir.split(File::SEPARATOR)
      parts.reduce do |path, basename|
        path = File.realpath(path) unless path == ""
        path = File.expand_path(path + File::SEPARATOR + basename)
        lstat = File.lstat path rescue nil
        if !lstat || !lstat.directory?
          unless normalize_path(path).start_with? normalize_path(destination_dir) and (FileUtils.mkdir path, **mkdir_options rescue false)
            raise Gem::Package::PathError.new(file_name, destination_dir)
          end
        end
        path
      end
    end

normalize_path(pathname) click to toggle source

    # File lib/rubygems/package.rb, line 496
    def normalize_path(pathname)
      if Gem.win_platform?
        pathname.downcase
      else
        pathname
      end
    end

read_checksums(gem) click to toggle source

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

    # File lib/rubygems/package.rb, line 548
    def read_checksums(gem)
      Gem.load_yaml

      @checksums = gem.seek 'checksums.yaml.gz' do |entry|
        Zlib::GzipReader.wrap entry do |gz_io|
          Gem::SafeYAML.safe_load gz_io.read
        end
      end
    end

setup_signer(signer_options: {}) click to toggle source

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

    # File lib/rubygems/package.rb, line 562
    def setup_signer(signer_options: {})
      passphrase = ENV['GEM_PRIVATE_KEY_PASSPHRASE']
      if @spec.signing_key
        @signer =
          Gem::Security::Signer.new(
            @spec.signing_key,
            @spec.cert_chain,
            passphrase,
            signer_options
          )

        @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

spec() click to toggle source

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.

    # File lib/rubygems/package.rb, line 589
    def spec
      verify unless @spec

      @spec
    end

verify() click to toggle source

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`

    # File lib/rubygems/package.rb, line 605
    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_entry(entry) click to toggle source

Verifies `entry` in a .gem file.

    # File lib/rubygems/package.rb, line 655
    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", "metadata.gz" then
        load_spec entry
      when 'data.tar.gz' then
        verify_gz entry
      end
    rescue
      warn "Exception while verifying #{@gem.path}"
      raise
    end

verify_files(gem) click to toggle source

Verifies the files of the `gem`

    # File lib/rubygems/package.rb, line 681
    def verify_files(gem)
      gem.each do |entry|
        verify_entry entry
      end

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

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

      if duplicates = @files.group_by {|f| f }.select {|k,v| v.size > 1 }.map(&:first) and duplicates.any?
        raise Gem::Security::Exception, "duplicate files in the package: (#{duplicates.map(&:inspect).join(', ')})"
      end
    end

### Protected Instance Methods

initialize(gem, security_policy) click to toggle source

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

    # File lib/rubygems/package.rb, line 187
    def initialize(gem, security_policy) # :notnew:
      require 'zlib'

      @gem = gem

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