Merge branch 'valentindavid/fix_included_junction_track-1.2' into 'bst-1.2'

Fix tracking of junctions used in project.conf.

See merge request !645

buildstream/_stream.py

@@ -267,8 +267,11 @@ class Stream():
               except_targets=None,
               cross_junctions=False):
 
+        # We pass no target to build. Only to track. Passing build targets
+        # would fully load project configuration which might not be
+        # possible before tracking is done.
         _, elements = \
-            self._load(targets, targets,
+            self._load([], targets,
                        selection=selection, track_selection=selection,
                        except_targets=except_targets,
                        track_except_targets=except_targets,
@@ -817,6 +820,12 @@ class Stream():
     #
     # A convenience method for loading element lists
     #
+    # If `targets` is not empty used project configuration will be
+    # fully loaded. If `targets` is empty, tracking will still be
+    # resolved for elements in `track_targets`, but no build pipeline
+    # will be resolved. This is behavior is import for track() to
+    # not trigger full loading of project configuration.
+    #
     # Args:
     #    targets (list of str): Main targets to load
     #    track_targets (list of str): Tracking targets
@@ -864,7 +873,7 @@ class Stream():
         #
         # This can happen with `bst build --track`
         #
-        if not self._pipeline.targets_include(elements, track_elements):
+        if targets and not self._pipeline.targets_include(elements, track_elements):
             raise StreamError("Specified tracking targets that are not "
                               "within the scope of primary targets")
 
@@ -900,6 +909,10 @@ class Stream():
         for element in track_selected:
             element._schedule_tracking()
 
+        if not targets:
+            self._pipeline.resolve_elements(track_selected)
+            return [], track_selected
+
         # ArtifactCache.setup_remotes expects all projects to be fully loaded
         for project in self._context.get_projects():
             project.ensure_fully_loaded()

tests/frontend/track.py

@@ -612,3 +612,25 @@ def test_track_include_junction(cli, tmpdir, datafiles, ref_storage, kind):
         # Assert that we are now buildable because the source is
         # now cached.
         assert cli.get_element_state(project, element_name) == 'buildable'
+
+
+@pytest.mark.datafiles(DATA_DIR)
+@pytest.mark.parametrize("ref_storage", [('inline'), ('project.refs')])
+@pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS])
+def test_track_junction_included(cli, tmpdir, datafiles, ref_storage, kind):
+    project = os.path.join(datafiles.dirname, datafiles.basename)
+    element_path = os.path.join(project, 'elements')
+    subproject_path = os.path.join(project, 'files', 'sub-project')
+    sub_element_path = os.path.join(subproject_path, 'elements')
+    junction_path = os.path.join(element_path, 'junction.bst')
+
+    configure_project(project, {
+        'ref-storage': ref_storage,
+        '(@)': ['junction.bst:test.yml']
+    })
+
+    generate_junction(str(tmpdir.join('junction_repo')),
+                      subproject_path, junction_path, store_ref=False)
+
+    result = cli.run(project=project, args=['track', 'junction.bst'])
+    result.assert_success()