def gitmodule_report(self):
        """
        Yields:
            str: .gitmodules configuration lines for this repository
        """
        fpath = self.relpath
        if fpath == '.':
            return
        yield '[submodule "%s"]' % fpath.replace(os.path.sep, '_')
        yield "    path = %s" % fpath
        yield "    url = %s" % self.remote_url
        yield ""
Yields:
            str: .gitmodules configuration lines for this repository