Method: LibGems::Validator#alien

Defined in:
lib/libgems/validator.rb

#alien(gems = []) ⇒ Object

Checks the gem directory for the following potential inconsistencies/problems:

  • Checksum gem itself

  • For each file in each gem, check consistency of installed versions

  • Check for files that aren’t part of the gem but are in the gems directory

  • 1 cache - 1 spec - 1 directory.

returns a hash of ErrorData objects, keyed on the problem gem’s name.



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# File 'lib/libgems/validator.rb', line 88

def alien(gems=[])
  errors = Hash.new { |h,k| h[k] = {} }

  LibGems::SourceIndex.from_installed_gems.each do |gem_name, gem_spec|
    next unless gems.include? gem_spec.name unless gems.empty?

    install_dir = gem_spec.installation_path
    gem_path = File.join install_dir, "cache", gem_spec.file_name
    spec_path = File.join install_dir, "specifications", gem_spec.spec_name
    gem_directory = gem_spec.full_gem_path

    unless File.directory? gem_directory then
      errors[gem_name][gem_spec.full_name] =
        "Gem registered but doesn't exist at #{gem_directory}"
      next
    end

    unless File.exist? spec_path then
      errors[gem_name][spec_path] = "Spec file missing for installed gem"
    end

    begin
      verify_gem_file(gem_path)

      good, gone, unreadable = nil, nil, nil, nil

      open gem_path, LibGems.binary_mode do |file|
        format = LibGems::Format.from_file_by_path(gem_path)

        good, gone = format.file_entries.partition { |entry, _|
          File.exist? File.join(gem_directory, entry['path'])
        }

        gone.map! { |entry, _| entry['path'] }
        gone.sort.each do |path|
          errors[gem_name][path] = "Missing file"
        end

        good, unreadable = good.partition { |entry, _|
          File.readable? File.join(gem_directory, entry['path'])
        }

        unreadable.map! { |entry, _| entry['path'] }
        unreadable.sort.each do |path|
          errors[gem_name][path] = "Unreadable file"
        end

        good.each do |entry, data|
          begin
            next unless data # HACK `gem check -a mkrf`

            open File.join(gem_directory, entry['path']), LibGems.binary_mode do |f|
              unless Digest::MD5.hexdigest(f.read).to_s ==
                  Digest::MD5.hexdigest(data).to_s then
                errors[gem_name][entry['path']] = "Modified from original"
              end
            end
          end
        end
      end

      installed_files = find_files_for_gem(gem_directory)
      good.map! { |entry, _| entry['path'] }
      extras = installed_files - good - unreadable

      extras.each do |extra|
        errors[gem_name][extra] = "Extra file"
      end
    rescue LibGems::VerificationError => e
      errors[gem_name][gem_path] = e.message
    end
  end

  errors.each do |name, subhash|
    errors[name] = subhash.map { |path, msg| ErrorData.new(path, msg) }
  end

  errors
end