execute

# File lib/rubygems/commands/unpack_command.rb, line 75
  def execute
    security_policy = options[:security_policy]

    get_all_gem_names.each do |name|
      dependency = Gem::Dependency.new name, options[:version]
      path = get_path dependency

      unless path
        alert_error "Gem '#{name}' not installed nor fetchable."
        next
      end

      if @options[:spec]
        spec, metadata = get_metadata path, security_policy

        if metadata.nil?
          alert_error "--spec is unsupported on '#{name}' (old format gem)"
          next
        end

        spec_file = File.basename spec.spec_file

        FileUtils.mkdir_p @options[:target] if @options[:target]

        destination = begin
          if @options[:target]
            File.join @options[:target], spec_file
          else
            spec_file
          end
        end

        File.open destination, 'w' do |io|
          io.write metadata
        end
      else
        basename = File.basename path, '.gem'
        target_dir = File.expand_path basename, options[:target]

        package = Gem::Package.new path, security_policy
        package.extract_files target_dir

        say "Unpacked gem: '#{target_dir}'"
      end
    end
  end