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getpath: Add comments highlighing details of the pyvenv.cfg detection (#127966)

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Filipe Laíns 🇵🇸 2024-12-15 15:40:19 +00:00 • committed by GitHub
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commit 3683b2f9e5
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11
Modules/getpath.py
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@ -363,10 +363,20 @@ 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!
for line in pyvenvcfg:
key, had_equ, value = line.partition('=')
if had_equ and key.strip().lower() == 'home':
# Override executable_dir/real_executable_dir with the value from 'home'.
# These values may be later used to calculate prefix/base_prefix, if a more
# reliable source — like the runtime library (libpython) path — isn't available.
executable_dir = real_executable_dir = value.strip()
# If base_executable — which points to the Python interpreted from
# the base installation — isn't set (eg. when embedded), try to find
# it in 'home'.
if not base_executable:
# First try to resolve symlinked executables, since that may be
# more accurate than assuming the executable in 'home'.
@ -400,6 +410,7 @@ def search_up(prefix, *landmarks, test=isfile):
break
break
else:
# We didn't find a 'home' key in pyvenv.cfg (no break), reset venv_prefix.
venv_prefix = None