def is_being_cached(self, image_id):
        path = self.get_image_filepath(image_id, 'incomplete')
        return os.path.exists(path)
Helper for `link()`
dataset/ETHPy150Open rcbops/glance-buildpackage/glance/image_cache/drivers/xattr.py/Driver.is_being_cached--crossover with--dataset/ETHPy150Open QuantSoftware/QuantSoftwareToolkit/Legacy/epydoc-3.0.1/epydoc/docwriter/dotgraph.py/DotGraph._link_href