pr-autoupdate.yml

# Auto-update open PRs targeting testing when testing advances.
# Prevents the BEHIND state that blocks auto-merge from triggering.
# Runs after every push to testing (including merge-queue squash commits).
# Non-destructive: gh pr update-branch merges testing in; conflicts stay open.
name: PR Auto-update

on:
  push:
    branches:
      - testing

concurrency:
  group: pr-autoupdate
  cancel-in-progress: true

jobs:
  update-stale-prs:
    name: Update stale PRs targeting testing
    runs-on: ubuntu-24.04
    timeout-minutes: 10
    permissions:
      contents: write
      pull-requests: write
    steps:
      - name: Find and update stale PRs
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
        run: |
          set -euo pipefail

          # Find all open PRs targeting testing that are BEHIND and need updating.
          # Renovate manages its own branch updates — skip them.
          # Mergeraptor PRs (distrobox, junction bumps) DO target testing and need auto-update
          # so renovate-automerge can fire. They are intentionally included here.
          STALE_PRS=$(gh pr list \
            --repo "$REPO" \
            --base testing \
            --state open \
            --json number,headRefName,mergeStateStatus,author \
            --jq '
              .[] |
              select(.mergeStateStatus == "BEHIND") |
              select(.author.login != "renovate[bot]") |
              .number
            ')

          if [ -z "$STALE_PRS" ]; then
            echo "No stale PRs found — nothing to do"
            exit 0
          fi

          echo "Stale PRs to update: $(echo "$STALE_PRS" | tr '\n' ' ')"

          UPDATED=0
          SKIPPED=0
          for PR_NUM in $STALE_PRS; do
            if gh pr update-branch "$PR_NUM" --repo "$REPO" 2>/dev/null; then
              echo "  ✅ PR #${PR_NUM} updated"
              UPDATED=$((UPDATED + 1))
            else
              echo "  ⚠️  PR #${PR_NUM} skipped (already up-to-date or merge conflict)"
              SKIPPED=$((SKIPPED + 1))
            fi
          done

          echo "Done — updated: ${UPDATED}, skipped: ${SKIPPED}"