compiler = "{}/compiler/".format(top_level)
# Look for a version to compare to based on the current commit.
- # Ideally this would just use `merge-base`, but on beta and stable branches that wouldn't
- # come up with any commits, so hack it and use `author=bors` instead.
- merge_base = ["git", "log", "--author=bors", "--pretty=%H", "-n1", "--", compiler]
+ # Only commits merged by bors will have CI artifacts.
+ merge_base = ["git", "log", "--author=bors", "--pretty=%H", "-n1"]
commit = subprocess.check_output(merge_base, universal_newlines=True).strip()
# Warn if there were changes to the compiler since the ancestor commit.