mercurial/interfaces/util.py

stream-clone: also filter the requirement we put in the bundle 2

We were wrongly putting irrelevant requirements in the bundle and the receiving
side was getting confused, treating them as being missing while still putting
them in the `requires` file. Leading do corrupted repositories.

This changes fix stream-clone behavior regarding format when bundle-2 is
involved, so we now also test this cases.

Behavior with older version of Mercurial will be fine as they filter the
requirements they get from the bundle on their side anyway.

Differential Revision: https://phab.mercurial-scm.org/D12084

# util.py - Utilities for declaring interfaces.
#
# Copyright 2018 Gregory Szorc <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

# zope.interface imposes a run-time cost due to module import overhead and
# bookkeeping for declaring interfaces. So, we use stubs for various
# zope.interface primitives unless instructed otherwise.

from __future__ import absolute_import

from .. import encoding

if encoding.environ.get(b'HGREALINTERFACES'):
    from ..thirdparty.zope import interface as zi

    Attribute = zi.Attribute
    Interface = zi.Interface
    implementer = zi.implementer
else:

    class Attribute(object):
        def __init__(self, __name__, __doc__=b''):
            pass

    class Interface(object):
        def __init__(
            self, name, bases=(), attrs=None, __doc__=None, __module__=None
        ):
            pass

    def implementer(*ifaces):
        def wrapper(cls):
            return cls

        return wrapper