Bug#969548: setuptools breaks ffc autopkgtest: No module named 'ffc_factory'

[Paul Gevers]

Source: setuptools, ffc
Control: found -1 setuptools/49.3.1-2
Control: found -1 ffc/2019.2.0~git20200123.6b621eb-2
Severity: serious
Tags: sid bullseye
X-Debbugs-CC: debian-ci at lists.debian.org
User: debian-ci at lists.debian.org
Usertags: breaks needs-update

Dear maintainer(s),

With a recent upload of setuptools the autopkgtest of ffc fails in
testing when that autopkgtest is run with the binary packages of
setuptools from unstable. It passes when run with only packages from
testing. In tabular form:

                       pass            fail
setuptools             from testing    49.3.1-2
ffc                    from testing    2019.2.0~git20200123.6b621eb-2
all others             from testing    from testing

I copied some of the output at the bottom of this report.

Currently this regression is blocking the migration of setuptools to
testing [1]. Due to the nature of this issue, I filed this bug report
against both packages. Can you please investigate the situation and
reassign the bug to the right package?

More information about this bug and the reason for filing it can be found on
https://wiki.debian.org/ContinuousIntegration/RegressionEmailInformation

Paul

[1] https://qa.debian.org/excuses.php?package=setuptools

https://ci.debian.net/data/autopkgtest/testing/amd64/f/ffc/6909276/log.gz


==================================== ERRORS
====================================
_____________ ERROR collecting ufc/finite_element/test_evaluate.py
_____________
ImportError while importing test module
'/tmp/autopkgtest-lxc.cxd5j8yt/downtmp/build.Ndr/src/test/unit/ufc/finite_element/test_evaluate.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
unit/ufc/finite_element/test_evaluate.py:25: in <module>
    import ffc_factory
E   ModuleNotFoundError: No module named 'ffc_factory'
!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection
!!!!!!!!!!!!!!!!!!!!
=========================== 1 error in 1.40 seconds
============================
autopkgtest [10:34:49]: test test-ffc: -----------------------]

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