unpack

# File railties/lib/rails/gem_dependency.rb, line 252
    def unpack(options={})
      unless frozen? || framework_gem?
        FileUtils.mkdir_p unpack_base
        Dir.chdir unpack_base do
          Gem::GemRunner.new.run(unpack_command)
        end
        # Gem.activate changes the spec - get the original
        real_spec = Gem::Specification.load(specification.loaded_from)
        write_specification(real_spec)
      end
      dependencies.each { |dep| dep.unpack(options) } if options[:recursive]
    end