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[3.13] gh-129204: Add _PYTHON_SUBPROCESS_USE_POSIX_SPAWN environment knob (GH-132184) (#132191)

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gh-129204: Add _PYTHON_SUBPROCESS_USE_POSIX_SPAWN environment knob (GH-132184)

* Add _PYTHON_SUBPROCESS_USE_POSIX_SPAWN environment knob

Add support for disabling the use of `posix_spawn` via a variable in
the process environment.

While it was previously possible to toggle this by modifying the value
of `subprocess._USE_POSIX_SPAWN`, this required either patching CPython
or modifying it within the interpreter instance which is not always
possible, such as when running applications or scripts not under a
user's control.



* fixup NEWS entry

---------
(cherry picked from commit 4c5dcc6d82)

Signed-off-by: Vincent Fazio <vfazio@gmail.com>
Co-authored-by: Vincent Fazio <vfazio@gmail.com>
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Miss Islington (bot) 2025-04-07 08:24:24 +02:00 • committed by GitHub
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3
Lib/subprocess.py
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@ -715,6 +715,9 @@ def _use_posix_spawn():
# os.posix_spawn() is not available
return False
if ((_env := os.environ.get('_PYTHON_SUBPROCESS_USE_POSIX_SPAWN')) in ('0', '1')):
return bool(int(_env))
if sys.platform in ('darwin', 'sunos5'):
# posix_spawn() is a syscall on both macOS and Solaris,
# and properly reports errors

2
Misc/NEWS.d/next/Library/2025-04-06-19-25-12.gh-issue-129204.sAVFO6.rst Normal file
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@ -0,0 +1,2 @@
Introduce new ``_PYTHON_SUBPROCESS_USE_POSIX_SPAWN`` environment variable knob in
:mod:`subprocess` to control the use of :func:`os.posix_spawn`.