Support multi source source provenance info

src/buildstream/source.py

@@ -1367,6 +1367,7 @@ def create_source_info(
         version: str,
         *,
         version_guess: Optional[str] = None,
+        provenance_node: Optional[MappingNode] = None,
         extra_data: Optional[Dict[str, str]] = None,
     ) -> SourceInfo:
         """Create a :class:`.SourceInfo` object
@@ -1386,15 +1387,23 @@ def create_source_info(
                          choice depicting the type of version.
            version: A string which represents a unique version of this source input
            version_guess: An optional string representing the guessed human readable version
+           provenance_node: The optional YAML node with source provenance attributes,
+                            defaults to the provenance specified at the top level of the source.
            extra_data: Additional plugin defined key/values
 
         *Since: 2.5*
         """
         homepage = None
         issue_tracker = None
-        if self.__provenance is not None:
-            homepage = self.__provenance.homepage
-            issue_tracker = self.__provenance.issue_tracker
+
+        if provenance_node is not None:
+            provenance: Optional[_SourceProvenance] = _SourceProvenance.new_from_node(provenance_node)
+        else:
+            provenance = self.__provenance
+
+        if provenance is not None:
+            homepage = provenance.homepage
+            issue_tracker = provenance.issue_tracker
 
         return SourceInfo(
             self.get_kind(),

tests/frontend/show.py

@@ -814,3 +814,33 @@ def test_source_info_workspace(cli, datafiles, tmpdir):
 
     # There is no version guessing for a workspace
     assert source_info.get_str("version-guess", None) is None
+
+
+@pytest.mark.datafiles(os.path.join(DATA_DIR, "source-info"))
+def test_multi_source_info(cli, datafiles):
+    project = str(datafiles)
+    result = cli.run(
+        project=project, silent=True, args=["show", "--format", "%{name}:\n%{source-info}", "multisource.bst"]
+    )
+    result.assert_success()
+
+    loaded = _yaml.load_data(result.output)
+    sources = loaded.get_sequence("multisource.bst")
+
+    source_info = sources.mapping_at(0)
+    assert source_info.get_str("kind") == "multisource"
+    assert source_info.get_str("url") == "http://ponyfarm.com/ponies"
+    assert source_info.get_str("medium") == "pony-ride"
+    assert source_info.get_str("version-type") == "pony-age"
+    assert source_info.get_str("version") == "1234567"
+    assert source_info.get_str("version-guess", None) == "12"
+    assert source_info.get_str("homepage") == "https://flying-ponies.com/index.html"
+
+    source_info = sources.mapping_at(1)
+    assert source_info.get_str("kind") == "multisource"
+    assert source_info.get_str("url") == "http://ponyfarm.com/happy"
+    assert source_info.get_str("medium") == "pony-ride"
+    assert source_info.get_str("version-type") == "pony-age"
+    assert source_info.get_str("version") == "1234567"
+    assert source_info.get_str("version-guess", None) == "12"
+    assert source_info.get_str("homepage") == "http://happy.ponyfarm.com"

tests/frontend/source-info/elements/multisource.bst

@@ -0,0 +1,6 @@
+kind: import
+
+sources:
+- kind: multisource
+  provenance:
+    homepage: https://flying-ponies.com/index.html

tests/frontend/source-info/plugins/multisource.py

@@ -0,0 +1,46 @@
+from buildstream import Node, Source
+
+
+class MultiSource(Source):
+    BST_MIN_VERSION = "2.0"
+
+    def configure(self, node):
+        pass
+
+    def preflight(self):
+        pass
+
+    def get_unique_key(self):
+        return {}
+
+    def load_ref(self, node):
+        pass
+
+    def get_ref(self):
+        return {}
+
+    def set_ref(self, ref, node):
+        pass
+
+    def is_cached(self):
+        return False
+
+    def collect_source_info(self):
+        return [
+            self.create_source_info(
+                "http://ponyfarm.com/ponies", "pony-ride", "pony-age", "1234567", version_guess="12"
+            ),
+            self.create_source_info(
+                "http://ponyfarm.com/happy",
+                "pony-ride",
+                "pony-age",
+                "1234567",
+                version_guess="12",
+                provenance_node=Node.from_dict({"homepage": "http://happy.ponyfarm.com"}),
+            ),
+        ]
+
+
+# Plugin entry point
+def setup():
+    return MultiSource

tests/frontend/source-info/project.conf

@@ -12,5 +12,6 @@ plugins:
   path: plugins
   sources:
   - extradata
+  - multisource
   - testsource
   - unimplemented