Bug#970857: petsc4py breaks slepc4py autopkgtest: No module named 'petsc4py'

[Paul Gevers]

Source: petsc4py, slepc4py
Control: found -1 petsc4py/3.13.0-8
Control: found -1 slepc4py/3.13.0-4
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 petsc4py the autopkgtest of slepc4py fails in
testing when that autopkgtest is run with the binary packages of
petsc4py from unstable. It passes when run with only packages from
testing. In tabular form:

                       pass            fail
petsc4py               from testing    3.13.0-8
slepc4py               from testing    3.13.0-4
versioned deps [0]     from testing    from unstable
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 petsc4py 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

[0] You can see what packages were added from the second line of the log
file quoted below. The migration software adds source package from
unstable to the list if they are needed to install packages from
petsc4py/3.13.0-8. I.e. due to versioned dependencies or breaks/conflicts.
[1] https://qa.debian.org/excuses.php?package=petsc4py

https://ci.debian.net/data/autopkgtest/testing/amd64/s/slepc4py/7159911/log.gz

autopkgtest [02:27:47]: test run-demos-64: [-----------------------
Running slepc4py demos using SLEPC_DIR=/usr/lib/slepc64
PETSC_DIR=/usr/lib/petsc64
Run 64-bit demos (single processor) with python3
make: Entering directory
'/tmp/autopkgtest-lxc.7qqowpar/downtmp/build.3jI/src/test-demos'
python3 ex1.py
Traceback (most recent call last):
  File "ex1.py", line 2, in <module>
    slepc4py.init(sys.argv)
  File
"/usr/lib/slepc64/lib/python3/dist-packages/slepc4py/__init__.py", line
40, in init
    import slepc4py.lib
  File
"/usr/lib/slepc64/lib/python3/dist-packages/slepc4py/lib/__init__.py",
line 24, in <module>
    from petsc4py.lib import ImportPETSc
ModuleNotFoundError: No module named 'petsc4py'
make: *** [makefile:11: run_ex1] Error 1
make: Leaving directory
'/tmp/autopkgtest-lxc.7qqowpar/downtmp/build.3jI/src/test-demos'
autopkgtest [02:27:47]: test run-demos-64: -----------------------]

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