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311e5cdc51
Commit 3d2141bcee("support/testing/run-tests: specify multiprocessing
method") added a call to multiprocessing.set_start_method('fork') as a
workaround for python 3.14, which changed the default start method to
forkserver - Which is incompatible with the nose2 setup.
multiprocessing.set_start_method() is only supposed to be called a maximum
of 1 time per process and throws a RuntimeError if called more than that
(even with the same arguments):
>>> import multiprocessing
>>> multiprocessing.set_start_method('fork')
>>> multiprocessing.set_start_method('fork')
Traceback (most recent call last):
File "<python-input-2>", line 1, in <module>
multiprocessing.set_start_method('fork')
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^
File "/usr/lib/python3.13/multiprocessing/context.py", line 247, in set_start_method
raise RuntimeError('context has already been set')
Debian included a similar patch in python3-nose2 0.51.1-2 (currently in
testing/unstable) which adds its own call to set_start_method():
https://salsa.debian.org/python-team/packages/nose2/-/blob/debian/0.15.1-2/debian/patches/0004-plugins-mp-set-context-to-fork-for-Python-3.14-mp-AP.patch?ref_type=tags
Which comes from:
https://github.com/nose-devs/nose2/pull/644
As discussed in the upstream PR, this is not a correct fix is wrong and
breaks various use cases. An issue has been opened to get this fixed in the
Debian packaging at:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1129350
But until that is done, rework the patch to:
- Only override set_start_method() if needed to limit impact
- Monkey patch set_start_method() so additional calls are ignored
To unbreak run-test on affected Debian systems and add some documentation to
make it clear why this is done.
[Peter: use allow_none / force optional arguments as pointed out by Julien]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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