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Keep release branches in step with master, and close the remaining release-flow gaps - #520
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Master is the trunk, so PRs keep targeting it; nothing carried those changes into an open release branch, so release/4.4.0 would fall behind and a long-running release/5.0.0 would miss every 4.x fix. - release_sync.yaml: every push to master is merged into each open, unreleased release/X.Y.0 branch (publishing its next candidate) via the merges API. A conflicting merge opens or refreshes a sync/master-into-X.Y.0 PR, so the resolution never lands on master. PRs merged into master join the milestone of the lowest open release. Hotfix branches (X.Y.Z, Z > 0) are left alone. - release_next.yaml: after a release branch merges, release branches older than it can no longer be released; the merged PR gets a comment naming them. - release.yaml: releasing from master warns while release branches are open, since master may hold unreleased features. - CONTRIBUTING.md: trunk-based flow, major-version branches and hotfixes.
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📝 WalkthroughWalkthroughThe release workflows now warn about open release branches, check release versions after merges, and sync eligible release branches when master changes. The contribution guide describes the updated release, hotfix, and conflict-handling procedures. ChangesRelease branch management
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant MasterPush
participant ReleaseSyncWorkflow
participant GitHubAPI
MasterPush->>ReleaseSyncWorkflow: Trigger release sync
ReleaseSyncWorkflow->>GitHubAPI: List release branches and version tags
GitHubAPI-->>ReleaseSyncWorkflow: Return eligible release versions
ReleaseSyncWorkflow->>GitHubAPI: Assign eligible merged pull requests to milestone
ReleaseSyncWorkflow->>GitHubAPI: Merge master commit into selected branches
GitHubAPI-->>ReleaseSyncWorkflow: Return merge status
ReleaseSyncWorkflow->>GitHubAPI: Create or update conflict branch and pull request on conflict
Merge Risk: 🟡 Moderate · up to The new master-to-release sync can quietly miss milestone assignments when merges land in quick succession. It can also report success when a release branch did not receive master's changes. Address both before relying on this workflow for releases. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Review comments at @.github/workflows/release_sync.yaml:
- Line 25: Update the concurrency configuration in the release sync workflow to
use an unbounded queue for master-push runs, so pending runs are not replaced
when additional runs arrive. Keep cancel-in-progress disabled and preserve the
existing per-run milestone behavior.
- Around line 106-108: Update the merge-failure handling in
.github/workflows/release_sync.yaml lines 106-108 to record unexpected API
failures and exit nonzero after processing the remaining branches. At
.github/workflows/release_sync.yaml line 87, detect a failed sync-branch update
and report that its PR does not yet contain the current master commit.
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.github/workflows/release.yaml.github/workflows/release_next.yaml.github/workflows/release_sync.yamlCONTRIBUTING.md
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- release.yaml: drop the master "prerelease" option, whose plain vX.Y.Z tags counted as stable versions in every check; release candidates are now the only pre-releases. Re-running resumes after a partial failure: once the newest version is tagged it skips to what is left (the GitHub release, the back-merge PR, the milestone). An older, already-released branch is refused rather than "resumed", which would have moved `latest` backwards. Notes start from the stable release just before this one. The `latest` tag is moved with git instead of EndBug/latest-tag@latest, pointing at the release commit rather than the pre-bump one. - release_branch.yaml: pushes to a released branch (e.g. conflicts resolved on its back-merge PR) are ignored instead of failing. Sync PRs aren't added to the milestone. Deleting an unreleased release branch closes its milestone when nothing open is left in it. - release_sync.yaml: issues closed by a merged PR join the milestone too. - pr_prerelease.yaml: test builds are labelled with the release the PR ships in (its release branch, or the lowest open release/X.Y.0 for master). - CONTRIBUTING.md: resuming, abandoning, and no older-major maintenance.
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- A concurrency group keeps one pending run, and a newer push replaces it. Merges already used the latest master, but milestones only covered the pushed commit's PR, so a replaced run's PR was never milestoned. Each run now milestones every unmilestoned PR merged into master since the last release. - An unexpected merge API failure, or a sync branch that couldn't be brought up to master, used to pass silently. Both are now errors; the run tries every branch, then fails if any was left behind.
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🔄 Related Issues
Follow-up to #519. Master is where PRs go, but nothing carried its changes into an open release branch:
release/4.4.0would fall behind, and a long-runningrelease/5.0.0would miss every 4.x fix.What changed
Master stays the trunk; PRs keep targeting master.
release/X.Y.0branch (e.g. 4.4.0 and 5.0.0), which publishes their next rc. The merged PR is added to the milestone of the lowest open release, where it ships first.sync/master-into-X.Y.0PR is opened or refreshed. Conflicts are resolved there, so the resolution never commits to master.release/X.(Y+1).0is opened. Release branches older than the merged one (e.g.release/4.5.0after 5.0.0) can no longer be released, and the merged PR gets a comment naming them.release/X.Y.Zwith Z > 0, cut from a release tag) don't receive master, so they don't pick up unreleased features.CONTRIBUTING.mddocuments cutting them from the tag.release/5.0.0. It still receives every master push.release_sync.yamlandrelease_next.yamlact only through the PAT, so their merges and PRs trigger the rc workflow and checks. Both setpermissions: {}.Remaining gaps closed (second commit)
vX.Y.Ztags counted as stable versions in every check. Release candidates are now the only pre-releases.latestbackwards.4.5.0-pr530+sha), not with master's manifest version.latesttag is moved with two lines of git instead ofEndBug/latest-tag@latest, which was an unpinned third-party action. It now points at the release commit rather than the commit before the version bump.✅ Testing Steps
release/4.4.0andrelease/5.0.0were synced, while4.3.1(hotfix),4.3.0(released) and non-version names were skipped. After 5.0.0, a leftoverrelease/4.5.0was skipped.gh api --includestill reports the status code on failed requests, which the 409 handling depends on.release/4.4.0. That push only touches.github, so no new rc is expected.➕ Additional Notes
GitHub's merges API always creates a merge commit, so release branches get one per master push. The release's back-merge brings them to master as no-op merges.
PR Type
Enhancement, Documentation
Description
Synchronize master into open release branches
Open conflict PRs and assign milestones
Flag stale branches and risky master releases
Document trunk, major, and hotfix workflows
Diagram Walkthrough
File Walkthrough
release.yaml
Warn against risky releases directly from master.github/workflows/release.yaml
release_next.yaml
Report stale branches after release back-merges.github/workflows/release_next.yaml
release_sync.yaml
Synchronize master across active release branches.github/workflows/release_sync.yaml
release/X.Y.0branchesCONTRIBUTING.md
Document trunk-based release and hotfix workflowsCONTRIBUTING.md
Summary by CodeRabbit
masterare automatically synchronized to eligible release branches. When a sync encounters conflicts, a pull request is opened for resolution.