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gh-120037: Disable user site packages when a ._pth file is used #137428

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Merged
merged 2 commits into from
Aug 19, 2025
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gh-120037: Disable user site packages when a ._pth file is used #137428

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gh-120037: Disable user site packages when a ._pth file is used
zooba Aug 5, 2025
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Add test
zooba Aug 5, 2025
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7 changes: 7 additions & 0 deletions Doc/c-api/init_config.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -2258,6 +2258,7 @@ If a ``._pth`` file is present:
* Set :c:member:`~PyConfig.isolated` to ``1``.
* Set :c:member:`~PyConfig.use_environment` to ``0``.
* Set :c:member:`~PyConfig.site_import` to ``0``.
* Set :c:member:`~PyConfig.user_site_directory` to ``0`` (since 3.15).
* Set :c:member:`~PyConfig.safe_path` to ``1``.

If :c:member:`~PyConfig.home` is not set and a ``pyvenv.cfg`` file is present in
Expand All @@ -2278,6 +2279,12 @@ The ``__PYVENV_LAUNCHER__`` environment variable is used to set
therefore affected by :option:`-S`.


.. versionchanged:: 3.15

:c:member:`~PyConfig.user_site_directory` is now set to ``0`` when a
``._pth`` file is present.


Py_GetArgcArgv()
================

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9 changes: 9 additions & 0 deletions Lib/test/test_site.py
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Expand Up @@ -802,6 +802,15 @@ def test_underpth_dll_file(self):
)], env=env)
self.assertTrue(rc, "sys.path is incorrect")

@support.requires_subprocess()
def test_underpth_no_user_site(self):
pth_lines = [test.support.STDLIB_DIR, 'import site']
exe_file = self._create_underpth_exe(pth_lines)
p = subprocess.run([exe_file, '-X', 'utf8', '-c',
'import sys; '
'sys.exit(not sys.flags.no_user_site)'])
self.assertEqual(p.returncode, 0, "sys.flags.no_user_site was 0")


if __name__ == "__main__":
unittest.main()
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-08-05-20-24-12.gh-issue-120037.MB7MmI.rst
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@@ -0,0 +1,2 @@
Disable user site packages directory when a ``._pth`` file is used, even if
it contains ``import site``.
1 change: 1 addition & 0 deletions Modules/getpath.py
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Expand Up @@ -790,6 +790,7 @@ def search_up(prefix, *landmarks, test=isfile):
config['isolated'] = 1
config['use_environment'] = 0
config['site_import'] = 0
config['user_site_directory'] = 0
config['safe_path'] = 1
pythonpath = []
for line in pth:
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