samba-gpupdate: Check sysvol download paths in case-insensitive way

https://bugzilla.samba.org/show_bug.cgi?id=14665

Signed-off-by: David Mulder <dmulder@suse.com>
Reviewed-by: Björn Baumbach <bb@sernet.de>
(cherry picked from commit 2d6bed495e)

python/samba/gpclass.py

@@ -393,8 +393,9 @@ def cache_gpo_dir(conn, cache, sub_dir):
 
 def check_safe_path(path):
     dirs = re.split('/|\\\\', path)
-    if 'sysvol' in path:
-        dirs = dirs[dirs.index('sysvol') + 1:]
+    if 'sysvol' in path.lower():
+        ldirs = re.split('/|\\\\', path.lower())
+        dirs = dirs[ldirs.index('sysvol') + 1:]
     if '..' not in dirs:
         return os.path.join(*dirs)
     raise OSError(path)

selftest/knownfail.d/gpo

@@ -1 +0,0 @@
-^samba.tests.gpo.samba.tests.gpo.GPOTests.test_check_safe_path_typesafe_name