borg importer: add hint about numeric ids

Author: ThomasWaldmann

src/borg_import/main.py

@@ -302,6 +302,9 @@ class borgImporter(Importer):
     you need to give either absolute paths for the source and destination repositories
     or ssh:// URLs.
 
+    To avoid issues with user/group id-to-name mappings, the importer will only
+    transfer the numeric user and group ids for the files inside the archives.
+
     By default, archive names are preserved. Use --prefix to add a prefix to
     the imported archive names.
     """

src/borg_import/testsuite/test_borg.py

@@ -25,13 +25,13 @@ def test_borg_import(tmpdir, monkeypatch):
 
     # Create archives in the source repository
     subprocess.check_call([
-        "borg", "create", "--numeric-ids",
+        "borg", "create",
         f"{source_repo}::archive1",
         "."
     ], cwd=str(archive1_data))
 
     subprocess.check_call([
-        "borg", "create", "--numeric-ids",
+        "borg", "create",
         f"{source_repo}::archive2",
         "."
     ], cwd=str(archive2_data))