Running pybuild tests with search path for entry_points()

From	John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Newsgroups	linux.debian.devel
Subject	Running pybuild tests with search path for entry_points()
Date	2024-05-11 20:50 +0200
Message-ID	<ICZXb-cFfw-5@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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(Please CC me as I'm not subscribed to debian-devel)

Hello,

I am currently trying to update src:kiwi to its latest upstream version to fix
#1069389 [1].

The problem that I am now stuck with is that the testsuite uses the entry_points
class to test for the available kiwi.tasks. It looks like something like this:

from importlib_metadata import entry_points
for entry in dict.get(entry_points(), 'kiwi.tasks'):
	discovered_tasks[entry.name] = entry.load()

However, that fails because the kiwi module needs to be either installed for
entry_points() to find "kiwi.tasks" or the PYTHONPATH needs to include the
build directory below ".pybuild". Otherwise, entry_points() will not include
"kiwi.tasks" and the testsuite fails.

I noticed that entry_points() will also work as expected if the python interpretor
is run from within the build directory below ".pybuild", so I tried adding the
following to debian/rules according to [2]:

export PYTHONPATH = $(CURDIR)
export PYBUILD_TEST_ARGS_python3 = cd {build_dir}; python{version} -m discover

That doesn't work unfortunately and entry_points() still fails and there doesn't
seem to be much documentation available for pybuild which explains how to adjust
PYTHONPATH for running the testuite.

Note that I tried this with kiwi 10.0.16 plus the patch from [3]. I put up a little
reproducer in [4].

Does anyone know how to make pybuild set the proper PYTHONPATH so that entry_points()
works while running the testsuite?

Thanks,
Adrian

> [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1069389
> [2] https://wiki.debian.org/Python/Pybuild
> [3] https://github.com/OSInside/kiwi/pull/2550
> [4] https://github.com/OSInside/kiwi/issues/2548#issuecomment-2103993758

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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Running pybuild tests with search path for entry_points() John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2024-05-11 20:50 +0200

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