gh-90329: Add _winapi.GetLongPathName and GetShortPathName and use in venv to reduce warnings (GH-117817)

Lib/venv/__init__.py

@@ -107,6 +107,33 @@ class EnvBuilder:
         }
         return sysconfig.get_path(name, scheme='venv', vars=vars)
 
+    @classmethod
+    def _same_path(cls, path1, path2):
+        """Check whether two paths appear the same.
+
+        Whether they refer to the same file is irrelevant; we're testing for
+        whether a human reader would look at the path string and easily tell
+        that they're the same file.
+        """
+        if sys.platform == 'win32':
+            if os.path.normcase(path1) == os.path.normcase(path2):
+                return True
+            # gh-90329: Don't display a warning for short/long names
+            import _winapi
+            try:
+                path1 = _winapi.GetLongPathName(os.fsdecode(path1))
+            except OSError:
+                pass
+            try:
+                path2 = _winapi.GetLongPathName(os.fsdecode(path2))
+            except OSError:
+                pass
+            if os.path.normcase(path1) == os.path.normcase(path2):
+                return True
+            return False
+        else:
+            return path1 == path2
+
     def ensure_directories(self, env_dir):
         """
         Create the directories for the environment.
@@ -171,7 +198,7 @@ class EnvBuilder:
             # bpo-45337: Fix up env_exec_cmd to account for file system redirections.
             # Some redirects only apply to CreateFile and not CreateProcess
             real_env_exe = os.path.realpath(context.env_exe)
-            if os.path.normcase(real_env_exe) != os.path.normcase(context.env_exe):
+            if not self._same_path(real_env_exe, context.env_exe):
                 logger.warning('Actual environment location may have moved due to '
                                'redirects, links or junctions.\n'
                                '  Requested location: "%s"\n'