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[3.9] bpo-40592: shutil.which will not return None anymore if ; is the last char in PATHEXT (GH-20088) (GH-22912)

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shutil.which will not return None anymore for empty str in PATHEXT
Empty PATHEXT will now be defaulted to _WIN_DEFAULT_PATHEXT
(cherry picked from commit da6f098188)


Co-authored-by: Christopher Marchfelder <marchfelder@googlemail.com>
This commit is contained in:
Miss Skeleton (bot) 2020-10-23 14:38:05 -07:00 • committed by GitHub
parent f8d96b98a4
commit c437fe39cf
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3 changed files with 24 additions and 1 deletions
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7
Lib/shutil.py
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@ -53,6 +53,9 @@
_USE_CP_SENDFILE = hasattr(os, "sendfile") and sys.platform.startswith("linux")
_HAS_FCOPYFILE = posix and hasattr(posix, "_fcopyfile") # macOS
# CMD defaults in Windows 10
_WIN_DEFAULT_PATHEXT = ".COM;.EXE;.BAT;.CMD;.VBS;.JS;.WS;.MSC"
__all__ = ["copyfileobj", "copyfile", "copymode", "copystat", "copy", "copy2",
"copytree", "move", "rmtree", "Error", "SpecialFileError",
"ExecError", "make_archive", "get_archive_formats",
@ -1415,7 +1418,9 @@ def which(cmd, mode=os.F_OK | os.X_OK, path=None):
path.insert(0, curdir)
# PATHEXT is necessary to check on Windows.
pathext = os.environ.get("PATHEXT", "").split(os.pathsep)
pathext_source = os.getenv("PATHEXT") or _WIN_DEFAULT_PATHEXT
pathext = [ext for ext in pathext_source.split(os.pathsep) if ext]
if use_bytes:
pathext = [os.fsencode(ext) for ext in pathext]
# See if the given file matches any of the expected path extensions.