Report processing errors from trackingvalentindavid/post_tracking_errors

Failures to write files when tracking were not reported.

Fixes #533.

2 files changed, 32 insertions, 12 deletions

diff --git a/buildstream/_scheduler/queues/trackqueue.py b/buildstream/_scheduler/queues/trackqueue.py
index c7a8f4cc7..f443df3be 100644
--- a/buildstream/_scheduler/queues/trackqueue.py
+++ b/buildstream/_scheduler/queues/trackqueue.py
@@ -58,18 +58,9 @@ class TrackQueue(Queue):
         # Set the new refs in the main process one by one as they complete
         for unique_id, new_ref in result:
             source = _plugin_lookup(unique_id)
-            try:
-                # We appear processed if at least one source has changed
-                if source._save_ref(new_ref):
-                    changed = True
-            except SourceError as e:
-                # FIXME: We currently dont have a clear path to
-                #        fail the scheduler from the main process, so
-                #        this will just warn and BuildStream will exit
-                #        with a success code.
-                #
-                source.warn("Failed to update project file",
-                            detail="{}".format(e))
+            # We appear processed if at least one source has changed
+            if source._save_ref(new_ref):
+                changed = True
 
         element._tracking_done()
 
diff --git a/tests/frontend/track.py b/tests/frontend/track.py
index 73b63ec4c..3bcd719d4 100644
--- a/tests/frontend/track.py
+++ b/tests/frontend/track.py
@@ -1,3 +1,4 @@
+import stat
 import os
 import pytest
 from tests.testutils import cli, create_repo, ALL_REPO_KINDS, generate_junction
@@ -634,3 +635,31 @@ def test_track_junction_included(cli, tmpdir, datafiles, ref_storage, kind):
 
     result = cli.run(project=project, args=['track', 'junction.bst'])
     result.assert_success()
+
+
+@pytest.mark.datafiles(DATA_DIR)
+@pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
+def test_track_error_cannot_write_file(cli, tmpdir, datafiles, kind):
+    project = str(datafiles)
+    dev_files_path = os.path.join(project, 'files', 'dev-files')
+    element_path = os.path.join(project, 'elements')
+    element_name = 'track-test-{}.bst'.format(kind)
+
+    configure_project(project, {
+        'ref-storage': 'inline'
+    })
+
+    repo = create_repo(kind, str(tmpdir))
+    ref = repo.create(dev_files_path)
+
+    element_full_path = os.path.join(element_path, element_name)
+    generate_element(repo, element_full_path)
+
+    st = os.stat(element_path)
+    try:
+        os.chmod(element_path, stat.S_IMODE(st.st_mode) & ~stat.S_IWUSR)
+
+        result = cli.run(project=project, args=['track', element_name])
+        result.assert_main_error(ErrorDomain.STREAM, None)
+    finally:
+        os.chmod(element_path, stat.S_IMODE(st.st_mode))