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[3.14] gh-135773: have pyvenv.cfg without home key anchor a venv and deduce home (GH-135831) #136287

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Merged
ncoghlan merged 1 commit into from
Jul 4, 2025
Merged

[3.14] gh-135773: have pyvenv.cfg without home key anchor a venv and deduce home (GH-135831) #136287

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21 changes: 21 additions & 0 deletions 21 Lib/test/test_getpath.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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(
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11 changes: 4 additions & 7 deletions 11 Modules/getpath.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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':
Expand Down Expand Up @@ -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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