update: forbid updating repo-imports with --to-remote (#5475)

dvc/stage/imports.py

@@ -1,9 +1,16 @@
 import logging
 
+from dvc.exceptions import InvalidArgumentError
+
 logger = logging.getLogger(__name__)
 
 
 def _update_import_on_remote(stage, remote, jobs):
+    if stage.is_repo_import:
+        raise InvalidArgumentError(
+            "Can't update a repo import with --to-remote"
+        )
+
     url = stage.deps[0].path_info.url
     stage.outs[0].hash_info = stage.repo.cloud.transfer(
         url, jobs=jobs, remote=remote, command="update"

tests/func/test_update.py

@@ -3,6 +3,7 @@ import os
 import pytest
 
 from dvc.dvcfile import Dvcfile
+from dvc.exceptions import InvalidArgumentError
 from tests.unit.fs.test_repo import make_subrepo
 
 
@@ -317,6 +318,14 @@ def test_update_from_subrepos(tmp_dir, dvc, erepo_dir, is_dvc):
     }
 
 
+def test_update_import_to_remote(tmp_dir, dvc, erepo_dir, local_remote):
+    erepo_dir.scm_gen({"foo": "foo"}, commit="add foo")
+    stage = dvc.imp(os.fspath(erepo_dir), "foo")
+    erepo_dir.scm_gen({"foo": "bar"}, commit="update foo")
+    with pytest.raises(InvalidArgumentError):
+        dvc.update(stage.path, to_remote=True)
+
+
 @pytest.mark.parametrize(
     "workspace",
     [