'Open an object store.
:param path: Path of the object store.'

def __init__(self, path):

    super(DiskObjectStore, self).__init__()
    self.path = path
    self.pack_dir = os.path.join(self.path, PACKDIR)
    self._pack_cache_time = 0
    self._pack_cache = {}
    self._alternates = None
