# File lib/autobuild/import/tar.rb, line 70
        def url=(url)
            @url = URI.parse(url)
            raise ConfigException, "invalid URL #{url}" unless VALID_URI_SCHEMES.include?(@url.scheme)

            @mode = TarImporter.url_to_mode(url)
            if @url.scheme == 'file'
                @cachefile = @url
            else
                @cachefile = File.join(cachedir, File.basename(@url.path))
            end
        end