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

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* 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.

Signed-off-by: Vincent Fazio <vfazio@gmail.com>

* fixup NEWS entry

---------

Signed-off-by: Vincent Fazio <vfazio@gmail.com>
This commit is contained in:
Vincent Fazio 2025-04-06 22:53:02 -05:00 • committed by GitHub
parent 6eaa4aeef2
commit 4c5dcc6d82
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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