# File lib/fpm/source/rpm.rb, line 19
  def make_tarball!(tar_path, builddir)
    tmpdir = "#{tar_path}.dir"
    ::Dir.mkdir(tmpdir)
    safesystem("rpm2cpio #{@rpm} | (cd #{tmpdir}; cpio -i --make-directories)")
    tar(tar_path, ".", tmpdir)
    @paths = ["."]
    # TODO(sissel): Make a helper method.
    safesystem(*["gzip", "-f", tar_path])
  end