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ci: update automated backport workflow to skip if backport already in-flight or completed (#6317)

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Updates the backport workflow so it filters out branches that have
already been backported, allowing new labels to trigger fresh
cherry-picks without reprocessing completed targets.

Also adds an automatic cleanup step that removes the `needs-backport`
trigger label once a run succeeds, aligning its behavior with the other
label-driven automations.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6317-ci-update-automated-backport-workflow-to-skip-if-backport-already-in-flight-or-completed-2996d73d36508113b90df43b1f68344f)
by [Unito](https://www.unito.io)
This commit is contained in:
Christian Byrne
2025-10-26 22:14:30 -07:00
committed by GitHub
parent 20a1a9eda2
commit 298b3c629b
1 changed files with 78 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

109
.github/workflows/pr-backport.yaml vendored
View File

@@ -69,34 +69,7 @@ jobs:
git config user.name "github-actions[bot]"
git config user.email "github-actions[bot]@users.noreply.github.com"
- name: Check if backports already exist
id: check-existing
env:
GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
PR_NUMBER: ${{ github.event_name == 'workflow_dispatch' && inputs.pr_number || github.event.pull_request.number }}
run: |
# Check for existing backport PRs for this PR number
EXISTING_BACKPORTS=$(gh pr list --state all --search "backport-${PR_NUMBER}-to" --json title,headRefName,baseRefName | jq -r '.[].headRefName')
if [ -z "$EXISTING_BACKPORTS" ]; then
echo "skip=false" >> $GITHUB_OUTPUT
exit 0
fi
# For manual triggers with force_rerun, proceed anyway
if [ "${{ github.event_name }}" = "workflow_dispatch" ] && [ "${{ inputs.force_rerun }}" = "true" ]; then
echo "skip=false" >> $GITHUB_OUTPUT
echo "::warning::Force rerun requested - existing backports will be updated"
exit 0
fi
echo "Found existing backport PRs:"
echo "$EXISTING_BACKPORTS"
echo "skip=true" >> $GITHUB_OUTPUT
echo "::warning::Backport PRs already exist for PR #${PR_NUMBER}, skipping to avoid duplicates"
- name: Collect backport targets
if: steps.check-existing.outputs.skip != 'true'
id: targets
run: |
TARGETS=()
@@ -151,8 +124,76 @@ jobs:
echo "targets=${TARGETS[*]}" >> $GITHUB_OUTPUT
echo "Found backport targets: ${TARGETS[*]}"
- name: Filter already backported targets
id: filter-targets
env:
EVENT_NAME: ${{ github.event_name }}
FORCE_RERUN_INPUT: >-
${{ github.event_name == 'workflow_dispatch' && inputs.force_rerun
|| 'false' }}
GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
PR_NUMBER: >-
${{ github.event_name == 'workflow_dispatch' && inputs.pr_number
|| github.event.pull_request.number }}
run: |
set -euo pipefail
REQUESTED_TARGETS="${{ steps.targets.outputs.targets }}"
if [ -z "$REQUESTED_TARGETS" ]; then
echo "skip=true" >> $GITHUB_OUTPUT
echo "pending-targets=" >> $GITHUB_OUTPUT
exit 0
fi
FORCE_RERUN=false
if [ "$EVENT_NAME" = "workflow_dispatch" ] && [ "$FORCE_RERUN_INPUT" = "true" ]; then
FORCE_RERUN=true
fi
mapfile -t EXISTING_BRANCHES < <(
git ls-remote --heads origin "backport-${PR_NUMBER}-to-*" || true
)
PENDING=()
SKIPPED=()
for target in $REQUESTED_TARGETS; do
SAFE_TARGET=$(echo "$target" | tr '/' '-')
BACKPORT_BRANCH="backport-${PR_NUMBER}-to-${SAFE_TARGET}"
if [ "$FORCE_RERUN" = true ]; then
PENDING+=("$target")
continue
fi
if printf '%s\n' "${EXISTING_BRANCHES[@]:-}" |
grep -Fq "refs/heads/${BACKPORT_BRANCH}"; then
SKIPPED+=("$target")
else
PENDING+=("$target")
fi
done
SKIPPED_JOINED="${SKIPPED[*]:-}"
PENDING_JOINED="${PENDING[*]:-}"
echo "already-exists=${SKIPPED_JOINED}" >> $GITHUB_OUTPUT
echo "pending-targets=${PENDING_JOINED}" >> $GITHUB_OUTPUT
if [ -z "$PENDING_JOINED" ]; then
echo "skip=true" >> $GITHUB_OUTPUT
if [ -n "$SKIPPED_JOINED" ]; then
echo "::warning::Backport branches already exist for: ${SKIPPED_JOINED}"
fi
else
echo "skip=false" >> $GITHUB_OUTPUT
if [ -n "$SKIPPED_JOINED" ]; then
echo "::notice::Skipping already backported targets: ${SKIPPED_JOINED}"
fi
fi
- name: Backport commits
if: steps.check-existing.outputs.skip != 'true'
if: steps.filter-targets.outputs.skip != 'true'
id: backport
env:
PR_NUMBER: ${{ github.event_name == 'workflow_dispatch' && inputs.pr_number || github.event.pull_request.number }}
@@ -170,7 +211,7 @@ jobs:
MERGE_COMMIT="${{ github.event.pull_request.merge_commit_sha }}"
fi
for target in ${{ steps.targets.outputs.targets }}; do
for target in ${{ steps.filter-targets.outputs.pending-targets }}; do
TARGET_BRANCH="${target}"
SAFE_TARGET=$(echo "$TARGET_BRANCH" | tr '/' '-')
BACKPORT_BRANCH="backport-${PR_NUMBER}-to-${SAFE_TARGET}"
@@ -219,7 +260,7 @@ jobs:
fi
- name: Create PR for each successful backport
if: steps.check-existing.outputs.skip != 'true' && steps.backport.outputs.success
if: steps.filter-targets.outputs.skip != 'true' && steps.backport.outputs.success
env:
GH_TOKEN: ${{ secrets.PR_GH_TOKEN }}
PR_NUMBER: ${{ github.event_name == 'workflow_dispatch' && inputs.pr_number || github.event.pull_request.number }}
@@ -258,7 +299,7 @@ jobs:
done
- name: Comment on failures
if: steps.check-existing.outputs.skip != 'true' && failure() && steps.backport.outputs.failed
if: steps.filter-targets.outputs.skip != 'true' && failure() && steps.backport.outputs.failed
env:
GH_TOKEN: ${{ github.token }}
run: |
@@ -287,3 +328,9 @@ jobs:
gh pr comment "${PR_NUMBER}" --body "${COMMENT_BODY}"
fi
done
- name: Remove needs-backport label
if: steps.filter-targets.outputs.skip != 'true' && success()
run: gh pr edit ${{ github.event_name == 'workflow_dispatch' && inputs.pr_number || github.event.pull_request.number }} --remove-label "needs-backport"
env:
GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}