add helper for creating build_metadata from a dict (#31958)

helper
old-commit-hash: c197b3f52c

system/version.py

@@ -104,15 +104,9 @@ class BuildMetadata:
     return self.channel in RELEASE_BRANCHES
 
 
-
-def get_build_metadata(path: str = BASEDIR) -> BuildMetadata:
-  build_metadata_path = pathlib.Path(path) / BUILD_METADATA_FILENAME
-
-  if build_metadata_path.exists():
-    build_metadata = json.loads(build_metadata_path.read_text())
-    openpilot_metadata = build_metadata.get("openpilot", {})
-
+def build_metadata_from_dict(build_metadata: dict) -> BuildMetadata:
   channel = build_metadata.get("channel", "unknown")
+  openpilot_metadata = build_metadata.get("openpilot", {})
   version = openpilot_metadata.get("version", "unknown")
   release_notes = openpilot_metadata.get("release_notes", "unknown")
   git_commit = openpilot_metadata.get("git_commit", "unknown")
@@ -127,6 +121,14 @@ def get_build_metadata(path: str = BASEDIR) -> BuildMetadata:
               git_commit_date=git_commit_date,
               is_dirty=False))
 
+
+def get_build_metadata(path: str = BASEDIR) -> BuildMetadata:
+  build_metadata_path = pathlib.Path(path) / BUILD_METADATA_FILENAME
+
+  if build_metadata_path.exists():
+    build_metadata = json.loads(build_metadata_path.read_text())
+    return build_metadata_from_dict(build_metadata)
+
   git_folder = pathlib.Path(path) / ".git"
 
   if git_folder.exists():