# File lib/grit/repo.rb, line 393
    def archive_to_file(treeish = 'master', prefix = nil, filename = 'archive.tar.gz', format = nil, pipe = "gzip")
      options = {}
      options[:prefix] = prefix if prefix
      options[:format] = format if format
      self.git.archive(options, treeish, "| #{pipe} > #{filename}")
    end