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gh-99204: Calculate base_executable by alternate names in POSIX venvs (GH-99206)

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Check to see if `base_executable` exists. If it does not, attempt
to use known alternative names of the python binary to find an
executable in the path specified by `home`.

If no alternative is found, previous behavior is preserved.

Signed-off-by: Vincent Fazio <vfazio@gmail.com>

Signed-off-by: Vincent Fazio <vfazio@gmail.com>
This commit is contained in:
Vincent Fazio 2022-11-10 10:26:42 -06:00 • committed by GitHub
parent f1680c3fbf
commit c41b13d39c
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19
Modules/getpath.py
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@ -375,6 +375,25 @@ if not home and not py_setpath:
pass
if not base_executable:
base_executable = joinpath(executable_dir, basename(executable))
# It's possible "python" is executed from within a posix venv but that
# "python" is not available in the "home" directory as the standard
# `make install` does not create it and distros often do not provide it.
#
# In this case, try to fall back to known alternatives
if os_name != 'nt' and not isfile(base_executable):
base_exe = basename(executable)
for candidate in (DEFAULT_PROGRAM_NAME, f'python{VERSION_MAJOR}.{VERSION_MINOR}'):
candidate += EXE_SUFFIX if EXE_SUFFIX else ''
if base_exe == candidate:
continue
candidate = joinpath(executable_dir, candidate)
# Only set base_executable if the candidate exists.
# If no candidate succeeds, subsequent errors related to
# base_executable (like FileNotFoundError) remain in the
# context of the original executable name
if isfile(candidate):
base_executable = candidate
break
break
else:
venv_prefix = None