[Python-modules-team] Bug#954812: Bug#954812: pythonmagick: autopkgtest regression: cannot import name '_PythonMagick'

[Scott Kitterman]

The problem here is that py3versions -r falls back to supported versions when no X-Python3-Versions header field is present in debian/control and pythonmagic is only built for the current version:

https://packages.debian.org/sid/amd64/python3-pythonmagick/filelist

(shows only python3.8 objects)

This is hidden behind redirecting stderr to /Dev/null.

Solutions:

Preferred: build for all supported python3 versions, change the -r to -s and ditch the redirect.

Less preferred:. Change the -r to -d (default) and ditch the redirect.

You may also need to allow stderr in debian/tests/control.

Scott K

On March 23, 2020 8:43:19 PM UTC, Paul Gevers <elbrus at debian.org> wrote:
>Source: pythonmagick
>Version: 0.9.19-6
>X-Debbugs-CC: debian-ci at lists.debian.org
>Severity: serious
>User: debian-ci at lists.debian.org
>Usertags: regression
>
>Dear maintainer(s),
>
>With a recent upload of pythonmagick the autopkgtest of pythonmagick
>fails in testing when that autopkgtest is run with the binary packages
>of pythonmagick from unstable. It passes when run with only packages
>from testing. In tabular form:
>
>                       pass            fail
>pythonmagick           from testing    0.9.19-6
>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 to testing [1]. Can
>you please investigate the situation and fix it?
>
>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
>pythonmagick/0.9.19-6. I.e. due to versioned dependencies or
>breaks/conflicts.
>[1] https://qa.debian.org/excuses.php?package=pythonmagick
>
>https://ci.debian.net/data/autopkgtest/testing/amd64/p/pythonmagick/4632912/log.gz
>autopkgtest [18:24:16]: test python3: [-----------------------
>+ py3versions -r
>+ cd /tmp/autopkgtest-lxc.eflqupv1/downtmp/autopkgtest_tmp
>+ echo Testing with python3.7:
>Testing with python3.7:
>+ python3.7
>Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "/usr/lib/python3/dist-packages/PythonMagick/__init__.py", line
>1, in <module>
>    from . import _PythonMagick
>ImportError: cannot import name '_PythonMagick' from 'PythonMagick'
>(/usr/lib/python3/dist-packages/PythonMagick/__init__.py)
>autopkgtest [18:24:17]: test python3: -----------------------]