python-repoze-who (2.3-1 and 2.1-23) fails to build in rawhide:

======================================================================
ERROR: test_brokenimpl (repoze.who.tests.test_api.TestMakeRegistries)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/repoze.who-2.3/repoze/who/tests/test_api.py", line 107, in test_brokenimpl
    self.assertRaises(ValueError, self._callFUT,
  File "/usr/lib/python3.8/unittest/case.py", line 816, in assertRaises
    return context.handle('assertRaises', args, kwargs)
  File "/usr/lib/python3.8/unittest/case.py", line 202, in handle
    callable_obj(*args, **kwargs)
  File "/builddir/build/BUILD/repoze.who-2.3/repoze/who/tests/test_api.py", line 98, in _callFUT
    return make_registries(identifiers, authenticators,
  File "/builddir/build/BUILD/repoze.who-2.3/repoze/who/api.py", line 72, in make_registries
    verify(value, iface)
  File "/builddir/build/BUILD/repoze.who-2.3/repoze/who/api.py", line 57, in verify
    verifyObject(iface, plugin, tentative=True)
  File "/usr/lib/python3.8/site-packages/zope/interface/verify.py", line 172, in verifyObject
    return _verify(iface, candidate, tentative, vtype='o')
  File "/usr/lib/python3.8/site-packages/zope/interface/verify.py", line 92, in _verify
    raise MultipleInvalid(iface, candidate, excs)
zope.interface.exceptions.MultipleInvalid: The object <object object at 0xf722e4d0> has failed to implement interface <InterfaceClass repoze.who.interfaces.IIdentifier>:
    The repoze.who.interfaces.IIdentifier.identify(environ) attribute was not provided
    The repoze.who.interfaces.IIdentifier.remember(environ, identity) attribute was not provided
    The repoze.who.interfaces.IIdentifier.forget(environ, identity) attribute was not provided
----------------------------------------------------------------------
Ran 301 tests in 0.069s
FAILED (errors=1)

I strongly suspect this started happening after python-zope-interface was updated to 5.1.0 (bz1822171). Unfortunately, python-repoze-who was not tracked in Koschei, so I cannot tell for sure.


This blocks the test rebuild with Python 3.9.0a5.

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.9/fedora-rawhide-x86_64/01339462-python-repoze-who/

For all our attempts to build python-repoze-who with Python 3.9, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/package/python-repoze-who/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.9:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/

Let us know here if you have any questions.

Python 3.9 will be included in Fedora 33. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.9.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.