https://github.com/python/cpython/commit/93263d43141a81d369adfcddf325f9a54cb5766d
commit: 93263d43141a81d369adfcddf325f9a54cb5766d
branch: main
author: Richard Levasseur <[email protected]>
committer: ncoghlan <[email protected]>
date: 2025-07-04T23:44:37+10:00
summary:
gh-135773: have pyvenv.cfg without home key anchor a venv and deduce home
(#135831)
This is still formally undefined behaviour, but we may as well
keep the *same* undefined behaviour as previous versions.
PEP 796 proposes a cleaner and more consistent replacement for 3.15+
files:
M Lib/test/test_getpath.py
M Modules/getpath.py
diff --git a/Lib/test/test_getpath.py b/Lib/test/test_getpath.py
index f86df9d0d03485..83f09f3495547a 100644
--- a/Lib/test/test_getpath.py
+++ b/Lib/test/test_getpath.py
@@ -354,6 +354,27 @@ def test_venv_posix(self):
actual = getpath(ns, expected)
self.assertEqual(expected, actual)
+ def test_venv_posix_without_home_key(self):
+ ns = MockPosixNamespace(
+ argv0="/venv/bin/python3",
+ PREFIX="/usr",
+ ENV_PATH="/usr/bin",
+ )
+ # Setup the bare minimum venv
+ ns.add_known_xfile("/usr/bin/python3")
+ ns.add_known_xfile("/venv/bin/python3")
+ ns.add_known_link("/venv/bin/python3", "/usr/bin/python3")
+ ns.add_known_file("/venv/pyvenv.cfg", [
+ # home = key intentionally omitted
+ ])
+ expected = dict(
+ executable="/venv/bin/python3",
+ prefix="/venv",
+ base_prefix="/usr",
+ )
+ actual = getpath(ns, expected)
+ self.assertEqual(expected, actual)
+
def test_venv_changed_name_posix(self):
"Test a venv layout on *nix."
ns = MockPosixNamespace(
diff --git a/Modules/getpath.py b/Modules/getpath.py
index be2210345afbda..b89d7427e3febd 100644
--- a/Modules/getpath.py
+++ b/Modules/getpath.py
@@ -364,10 +364,9 @@ def search_up(prefix, *landmarks, test=isfile):
venv_prefix = None
pyvenvcfg = []
- # Search for the 'home' key in pyvenv.cfg. Currently, we don't consider the
- # presence of a pyvenv.cfg file without a 'home' key to signify the
- # existence of a virtual environment — we quietly ignore them.
- # XXX: If we don't find a 'home' key, we don't look for another pyvenv.cfg!
+ # Search for the 'home' key in pyvenv.cfg. If a home key isn't found,
+ # then it means a venv is active and home is based on the venv's
+ # executable (if its a symlink, home is where the symlink points).
for line in pyvenvcfg:
key, had_equ, value = line.partition('=')
if had_equ and key.strip().lower() == 'home':
@@ -412,10 +411,8 @@ def search_up(prefix, *landmarks, test=isfile):
if isfile(candidate):
base_executable = candidate
break
+ # home key found; stop iterating over lines
break
- else:
- # We didn't find a 'home' key in pyvenv.cfg (no break), reset
venv_prefix.
- venv_prefix = None
#
******************************************************************************
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