def _clone_upstream(self):
        self._clone(self.repository, self.cache_path)
        self.cache_created = True
:param dict default: A dict of default variant values.
dataset/ETHPy150Open zerok/zerokspot.gitrecipe/zerokspot/recipe/git/__init__.py/Recipe._clone_upstream--crossover with--dataset/ETHPy150Open pantsbuild/pants/src/python/pants/engine/exp/struct.py/Variants.__init__