bpo-31904: posixpath.expanduser() handles None user home on VxWorks (GH-23530)

Lib/posixpath.py

@@ -262,6 +262,9 @@ def expanduser(path):
             # password database, return the path unchanged
             return path
         userhome = pwent.pw_dir
+    # if no user home, return the path unchanged on VxWorks
+    if userhome is None and sys.platform == "vxworks":
+        return path
     if isinstance(path, bytes):
         userhome = os.fsencode(userhome)
         root = b'/'

Misc/NEWS.d/next/Library/2020-11-27-18-09-59.bpo-31904.g8k43d.rst

@@ -0,0 +1,2 @@
+:func:`posixpath.expanduser` returns the input *path* unchanged if
+user home directory is None on VxWorks.