fix(config): search backwards from root_dir when determining vcs_root

Author: ahal

src/taskgraph/config.py

@@ -155,7 +155,7 @@ def register(self):
     @property
     def vcs_root(self):
         try:
-            repo = get_repository(os.getcwd())
+            repo = get_repository(self.root_dir)
             return Path(repo.path)
         except RuntimeError:
             root = Path(self.root_dir)

test/test_generator.py

@@ -182,7 +182,7 @@ def test_load_tasks_for_kind(monkeypatch):
     tasks = load_tasks_for_kind(
         {"_kinds": [("_example-kind", []), ("docker-image", [])]},
         "_example-kind",
-        "/root",
+        "/root/taskcluster",
     )
     assert "docker-image-t-1" not in tasks
     assert (
@@ -193,7 +193,7 @@ def test_load_tasks_for_kind(monkeypatch):
     tasks = load_tasks_for_kinds(
         {"_kinds": [("_example-kind", []), ("docker-image", [])]},
         ["_example-kind", "docker-image"],
-        "/root",
+        "/root/taskcluster",
     )
     assert (
         "docker-image-t-1" in tasks