create: add exception handler for NODUMP excluded dirs, fixes #9032

src/borg/archiver/create_cmd.py

@@ -510,7 +510,13 @@ class CreateMixIn:
                             return
                     if not recurse_excluded_dir:
                         if not dry_run:
-                            status = fso.process_dir_with_fd(path=path, fd=child_fd, st=st, strip_prefix=strip_prefix)
+                            try:
+                                status = fso.process_dir_with_fd(
+                                    path=path, fd=child_fd, st=st, strip_prefix=strip_prefix
+                                )
+                            except BackupItemExcluded:
+                                status = "-"  # excluded (dir)
+                                recurse = False
                         else:
                             status = "+"  # included (dir)
                     if recurse:

src/borg/testsuite/archiver/create_cmd_test.py

@@ -1073,14 +1073,9 @@ def test_exclude_nodump_dir_with_file(archivers, request):
     if not has_lchflags:
         pytest.skip("platform does not support setting UF_NODUMP")
 
-    # Prepare input tree: input/nd (NODUMP) containing a file.
-    ndir = os.path.join(archiver.input_path, "nd")
-    os.mkdir(ndir)
-    with open(os.path.join(ndir, "file_in_ndir"), "wb") as f:
-        f.write(b"hello")
-
-    # Set NODUMP flag on the directory (Linux: chattr +d, BSD: chflags nodump)
-    platform.set_flags(ndir, stat.UF_NODUMP)
+    # Prepare input tree: input/nd directory (NODUMP) containing a file.
+    create_regular_file(archiver.input_path, "nd/file_in_ndir", contents=b"hello")
+    platform.set_flags(os.path.join(archiver.input_path, "nd"), stat.UF_NODUMP)
 
     # Create repo and archive
     cmd(archiver, "repo-create", RK_ENCRYPTION)