def count_objects(self):
        """Count the objects of a repository.

        The method returns the total number of objects (packed and unpacked)
        available on the repository.

        :raises RepositoryError: when an error occurs counting the objects
            of a repository
        """
        cmd_count = ['git', 'count-objects', '-v']

        outs = self._exec(cmd_count, cwd=self.dirpath, env=self.gitenv)
        outs = outs.decode('utf-8', errors='surrogateescape').rstrip()

        try:
            cobjs = {k: v for k, v in (x.split(': ') for x in outs.split('\n'))}
            nobjs = int(cobjs['count']) + int(cobjs['in-pack'])
        except KeyError as e:
            error = "unable to parse 'count-objects' output; reason: '%s' entry not found" \
                % e.args[0]
            raise RepositoryError(cause=error)
        except ValueError as e:
            error = "unable to parse 'count-objects' output; reason: %s" % str(e)
            raise RepositoryError(cause=error)

        logger.debug("Git %s repository has %s objects",
                     self.uri, str(nobjs))

        return nobjs
Count the objects of a repository.

        The method returns the total number of objects (packed and unpacked)
        available on the repository.

        :raises RepositoryError: when an error occurs counting the objects
            of a repository