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ci: add cherry-pick to latest release workflow (#24051)
Adds a GitHub Actions workflow that cherry-picks merged PRs to the latest release branch when the `cherry-pick` label is applied. ## How it works 1. Add the `cherry-pick` label to any PR targeting `main` (before or after merge). 2. On merge (or on label if already merged), the workflow detects the latest `release/*` branch. 3. It cherry-picks the merge commit (`-x -m1`) and opens a PR. This complements the `backport` label (see #24025) which targets the latest **3** release branches. `cherry-pick` targets only the **latest** one — useful for getting fixes into the current release. Created PRs follow existing repo conventions: - **Branch:** `backport/<pr>-to-<version>` - **Title:** `<original PR title> (#<pr>)` — e.g. `fix(site): correct button alignment (#12345)` - **Body:** links back to the original PR and merge commit If the cherry-pick encounters conflicts, the workflow aborts the cherry-pick, creates an empty commit with resolution instructions, and opens the PR with a `[CONFLICT]` prefix so the author can resolve manually. Also: - Removes `scripts/backport-pr.sh` (replaced by this workflow) - Removes `.github/cherry-pick-bot.yml` (old bot config) - Adds a section to the contributing docs explaining the `cherry-pick` label > [!NOTE] > Generated with [Coder Agents](https://coder.com/agents)
This commit is contained in:
Garrett Delfosse
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# Automatically cherry-pick merged PRs to the latest release branch when the
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# "cherry-pick" label is applied. Works whether the label is added before or
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# after the PR is merged.
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#
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# Usage:
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# 1. Add the "cherry-pick" label to a PR targeting main.
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# 2. When the PR merges (or if already merged), the workflow detects the
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# latest release/* branch and opens a cherry-pick PR against it.
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#
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# The created PRs follow existing repo conventions:
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# - Branch: backport/<pr>-to-<version>
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# - Title: <original PR title> (#<pr>)
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# - Body: links back to the original PR and merge commit
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name: Cherry-pick to release
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on:
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pull_request_target:
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branches:
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- main
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types:
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- closed
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- labeled
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permissions:
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contents: write
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pull-requests: write
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# Prevent duplicate runs for the same PR when both 'closed' and 'labeled'
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# fire in quick succession.
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concurrency:
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group: cherry-pick-${{ github.event.pull_request.number }}
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jobs:
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cherry-pick:
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name: Cherry-pick to latest release
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if: >
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github.event.pull_request.merged == true &&
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contains(github.event.pull_request.labels.*.name, 'cherry-pick')
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runs-on: ubuntu-latest
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env:
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PR_NUMBER: ${{ github.event.pull_request.number }}
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PR_TITLE: ${{ github.event.pull_request.title }}
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PR_URL: ${{ github.event.pull_request.html_url }}
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MERGE_SHA: ${{ github.event.pull_request.merge_commit_sha }}
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steps:
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- uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
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with:
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# Full history required for cherry-pick and branch discovery.
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fetch-depth: 0
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- name: Cherry-pick and open PR
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env:
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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run: |
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set -euo pipefail
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# Find the latest release branch matching the exact release/2.X
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# pattern (no suffixes like release/2.31_hotfix).
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RELEASE_BRANCH=$(
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git branch -r \
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| grep -E '^\s*origin/release/2\.[0-9]+$' \
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| sed 's|.*origin/||' \
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| sort -t. -k2 -n -r \
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| head -1
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)
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if [ -z "$RELEASE_BRANCH" ]; then
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echo "::error::No release branch found."
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exit 1
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fi
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# Strip the release/ prefix for naming.
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VERSION="${RELEASE_BRANCH#release/}"
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BACKPORT_BRANCH="backport/${PR_NUMBER}-to-${VERSION}"
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echo "Target branch: $RELEASE_BRANCH"
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echo "Backport branch: $BACKPORT_BRANCH"
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# Check if backport branch already exists (idempotency for re-runs).
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if git ls-remote --exit-code origin "refs/heads/${BACKPORT_BRANCH}" >/dev/null 2>&1; then
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echo "Branch ${BACKPORT_BRANCH} already exists, skipping."
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exit 0
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fi
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git config user.name "github-actions[bot]"
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git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
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# Create the backport branch from the target release branch.
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git checkout -b "$BACKPORT_BRANCH" "origin/${RELEASE_BRANCH}"
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# Cherry-pick the merge commit. Use -x to record provenance and
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# -m1 to pick the first parent (the main branch side).
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CONFLICT=false
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if ! git cherry-pick -x -m1 "$MERGE_SHA"; then
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CONFLICT=true
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echo "::warning::Cherry-pick to ${RELEASE_BRANCH} had conflicts."
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# Abort the failed cherry-pick and create an empty commit with
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# instructions so the PR can still be opened.
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git cherry-pick --abort
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git commit --allow-empty -m "cherry-pick of #${PR_NUMBER} failed — resolve conflicts manually
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Cherry-pick of ${MERGE_SHA} onto ${RELEASE_BRANCH} had conflicts.
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To resolve:
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git fetch origin ${BACKPORT_BRANCH}
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git checkout ${BACKPORT_BRANCH}
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git cherry-pick -x -m1 ${MERGE_SHA}
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# resolve conflicts
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git push origin ${BACKPORT_BRANCH}"
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fi
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git push origin "$BACKPORT_BRANCH"
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BODY=$(cat <<EOF
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Cherry-pick of ${PR_URL}
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Original PR: #${PR_NUMBER} — ${PR_TITLE}
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Merge commit: ${MERGE_SHA}
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EOF
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)
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TITLE="${PR_TITLE} (#${PR_NUMBER})"
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if [ "$CONFLICT" = true ]; then
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TITLE="[CONFLICT] ${TITLE}"
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fi
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# Check if a PR already exists for this branch (idempotency
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# for re-runs). Use --state all to catch closed/merged PRs too.
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EXISTING_PR=$(gh pr list --head "$BACKPORT_BRANCH" --base "$RELEASE_BRANCH" --state all --json number --jq '.[0].number // empty')
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if [ -n "$EXISTING_PR" ]; then
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echo "PR #${EXISTING_PR} already exists for ${BACKPORT_BRANCH}, skipping."
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exit 0
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fi
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gh pr create \
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--base "$RELEASE_BRANCH" \
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--head "$BACKPORT_BRANCH" \
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--title "$TITLE" \
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--body "$BODY"
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