_stream: Assert not loading both tracking and primary at the same time

1 files changed, 7 insertions, 0 deletions

diff --git a/src/buildstream/_stream.py b/src/buildstream/_stream.py
index f09a46185..e89d22b03 100644
--- a/src/buildstream/_stream.py
+++ b/src/buildstream/_stream.py
@@ -1180,6 +1180,13 @@ class Stream():
               dynamic_plan=False,
               load_refs=False):
 
+        # FIXME:
+        # Supplying both targets and track_targets together is deprecated behaviour
+        # which was supported by commands like `bst fetch` and `bst build --track`.
+        # This handling could be split into different code paths.
+        assert not (targets and track_targets), ("Support for targets and track targets"
+                                                 " in the same call of Stream._load is deprecated.")
+
         # Classify element and artifact strings
         target_elements, target_artifacts = self._classify_artifacts(targets)