def read(self):
        if not os.path.exists(self._filename):
            return
        f = GitFile(self._filename, 'rb')
        try:
            f = SHA1Reader(f)
            for x in read_index(f):
                self[x[0]] = tuple(x[1:])
            # FIXME: Additional data?
            f.read(os.path.getsize(self._filename)-f.tell()-20)
            f.check_sha()
        finally:
            f.close()
DELETE /cached_images - Clear all active cached images
dataset/ETHPy150Open natestedman/Observatory/observatory/lib/dulwich/index.py/Index.read--crossover with--dataset/ETHPy150Open rcbops/glance-buildpackage/glance/api/cached_images.py/Controller.delete_cached_images