https://github.com/python/cpython/commit/68bbdd902630a5f96ab598a8d6ecacee3c2d5d2e
commit: 68bbdd902630a5f96ab598a8d6ecacee3c2d5d2e
branch: 3.13
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: gpshead <g...@krypto.org>
date: 2025-04-06T23:24:24-07:00
summary:
[3.13] gh-129204: Add _PYTHON_SUBPROCESS_USE_POSIX_SPAWN environment knob
(GH-132184) (#132191)
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 4c5dcc6d8292d5142aff8401cb9b9d18b49c6c89)
Signed-off-by: Vincent Fazio <vfa...@gmail.com>
Co-authored-by: Vincent Fazio <vfa...@gmail.com>
files:
A Misc/NEWS.d/next/Library/2025-04-06-19-25-12.gh-issue-129204.sAVFO6.rst
M Lib/subprocess.py
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index f614c903c8837c..4a9a64e5577989 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -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
diff --git
a/Misc/NEWS.d/next/Library/2025-04-06-19-25-12.gh-issue-129204.sAVFO6.rst
b/Misc/NEWS.d/next/Library/2025-04-06-19-25-12.gh-issue-129204.sAVFO6.rst
new file mode 100644
index 00000000000000..d8994bf760b7bc
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-04-06-19-25-12.gh-issue-129204.sAVFO6.rst
@@ -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`.
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