use a branch instead of a tag

.github/workflows/update_tag.yml → .github/workflows/update_last_successful_branch.yml

@@ -19,27 +19,27 @@
 # We use it to cover windows and mac builds
 # Jenkins is still the primary CI
 
-name: Update last-successful tag
+name: Update last-successful branch
 
 on:
   workflow_dispatch:
   schedule:
     cron: 15/* * * * *
 
 concurrency:
-  group: update-last-successful-tag
+  group: update-last-successful-branch
   cancel-in-progress: true
 
 jobs:
-  update-last-successful-tag:
+  update-last-successful-branch:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
         with:
           submodules: "recursive"
-      - name: Update last-successful tag
+      - name: Update last-successful branch
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           set -eux
-          python tests/scripts/update_tag.py || echo step failed
+          python tests/scripts/update_branch.py || echo step failed

tests/scripts/update_tag.py → tests/scripts/update_branch

@@ -117,29 +117,26 @@ def commit_passed_ci(commit: Dict[str, Any]) -> bool:
     return passed_ci
 
 
-def update_tag(user: str, repo: str, sha: str, tag_name: str, message: str) -> None:
+def update_branch(user: str, repo: str, sha: str, branch_name: str, message: str) -> None:
     with tempfile.TemporaryDirectory() as f:
         # Clone only a specific commit: https://stackoverflow.com/a/3489576
         git(["init"], cwd=f)
         git(["remote", "add", "origin", f"git@github.com:{user}/{repo}.git"], cwd=f)
         git(["fetch", "origin", sha], cwd=f)
         git(["reset", "--hard", "FETCH_HEAD"], cwd=f)
-
-        # Create a push the tag
-        git(["tag", "--annotate", tag_name, f"--message={message}"], cwd=f)
-        git(["push", "origin", "--force", tag_name], cwd=f)
-        print(f"Pushed tag {tag_name} with commit {sha}")
+        git(["checkout", "-b", branch_name], cwd=f)
+
+        # Create and push the branch
+        git(["push", "origin", "--force", branch_name], cwd=f)
+        print(f"Pushed branch {branch_name} with commit {sha}")
 
 
 if __name__ == "__main__":
-    help = "Push the a tag to the last commit that passed all CI runs"
+    help = "Push the a branch to the last commit that passed all CI runs"
     parser = argparse.ArgumentParser(description=help)
     parser.add_argument("--remote", default="origin", help="ssh remote to parse")
     parser.add_argument("--dry-run", action="store_true", help="don't submit to GitHub")
-    parser.add_argument("--tag", default="last-successful", help="tag name")
-    parser.add_argument(
-        "--message", default="last 'main' commit that passed CI", help="label to add"
-    )
+    parser.add_argument("--branch", default="last-successful", help="branch name")
     parser.add_argument(
         "--testonly-json", help="(testing) data to use instead of fetching from GitHub"
     )
@@ -167,14 +164,14 @@ def update_tag(user: str, repo: str, sha: str, tag_name: str, message: str) -> N
             if commit_passed_ci(commit):
                 print(f"Found last good commit: {commit['oid']}: {commit['messageHeadline']}")
                 if not args.dry_run:
-                    update_tag(
+                    update_branch(
                         user=user,
                         repo=repo,
                         sha=commit["oid"],
-                        tag_name=args.tag,
+                        branch_name=args.branch,
                         message=args.message,
                     )
-                # Nothing to do after updating the tag, exit early
+                # Nothing to do after updating the branch, exit early
                 exit(0)
 
         # No good commit found, proceed to next page of results