patch_update_release.yml

name: Update Runner Patches (Release-to-Release)

on:
  schedule:
    - cron: '0 0 * * *'
  workflow_dispatch:
  push:
    paths:
      - 'patches/runner-sdk8-*.patch'
      - 'patches/last_processed_tag.txt'

jobs:
  update-patches:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout your repository
      uses: actions/checkout@v5
      with:
        fetch-depth: 0

    - name: Set up Git identity
      run: |
        git config --global user.name "GitHub Actions"
        git config --global user.email "actions@github.com"

    - name: Clone upstream runner repository
      run: git clone --tags https://github.com/actions/runner.git upstream-runner

    - name: Get release tags
      id: get-tags
      run: |
        cd upstream-runner
        # Get latest release tag
        LATEST_TAG=$(git tag --sort=-v:refname | grep '^v[0-9]' | head -n1)
        echo "LATEST_TAG=$LATEST_TAG" >> $GITHUB_OUTPUT
        echo "LATEST_COMMIT=$(git rev-parse $LATEST_TAG)" >> $GITHUB_OUTPUT
        
        # Get previous processed tag
        if [ -f ../patches/last_processed_tag.txt ]; then
          PREVIOUS_TAG=$(cat ../patches/last_processed_tag.txt)
          echo "PREVIOUS_TAG=$PREVIOUS_TAG" >> $GITHUB_OUTPUT
        else
          echo "PREVIOUS_TAG=" >> $GITHUB_OUTPUT
        fi

    - name: Check for new release
      if: steps.get-tags.outputs.PREVIOUS_TAG == steps.get-tags.outputs.LATEST_TAG
      run: |
        echo "No new releases - skipping"
        exit 0

    - name: Verify previous release exists
      if: steps.get-tags.outputs.PREVIOUS_TAG != '' && steps.get-tags.outputs.PREVIOUS_TAG != steps.get-tags.outputs.LATEST_TAG
      run: |
        cd upstream-runner
        if ! git rev-parse ${{ steps.get-tags.outputs.PREVIOUS_TAG }} >/dev/null 2>&1; then
          echo "Previous tag ${{ steps.get-tags.outputs.PREVIOUS_TAG }} not found"
          exit 1
        fi

    - name: Process architectures
      if: steps.get-tags.outputs.PREVIOUS_TAG != '' && steps.get-tags.outputs.PREVIOUS_TAG != steps.get-tags.outputs.LATEST_TAG
      id: process-arches
      run: |
        mkdir -p patches
        touch successful_arches.txt
        
        for arch in ppc64le s390x x86_64; do
          echo "Processing $arch..."
          cd upstream-runner
          
          # Reset to clean state
          git reset --hard
          git clean -fd
          
          # Check if previous patch exists
          if [ ! -f "../patches/runner-sdk8-$arch.patch" ] || \
             ! grep -q "${{ steps.get-tags.outputs.PREVIOUS_TAG }}" "../patches/runner-sdk8-$arch.patch"; then
            echo "No valid previous patch for $arch"
            cd ..
            continue
          fi

          # Apply previous patch to previous release
          git checkout ${{ steps.get-tags.outputs.PREVIOUS_TAG }}
          if ! git apply --check --whitespace=nowarn "../patches/runner-sdk8-$arch.patch"; then
            echo "::warning::Previous patch application failed for $arch"
            cd ..
            continue
          fi
          git apply --whitespace=nowarn "../patches/runner-sdk8-$arch.patch"
          
          # Stash changes
          git stash push -m "patch-$arch"
          
          # Apply to latest release
          git checkout ${{ steps.get-tags.outputs.LATEST_TAG }}
          if ! git stash apply stash^{/patch-$arch}; then
            echo "::warning::Stash application failed for $arch on ${{ steps.get-tags.outputs.LATEST_TAG }}"
            git reset --hard
            git stash drop || true
            cd ..
            continue
          fi
          
          # Create new patch
          git diff --patch --ignore-space-at-eol > "../patches/runner-sdk8-$arch.patch"
          echo "# From upstream release: ${{ steps.get-tags.outputs.LATEST_TAG }}" >> "../patches/runner-sdk8-$arch.patch"
          
          # Cleanup
          git reset --hard
          git stash drop || true
          cd ..
          
          echo "$arch" >> successful_arches.txt
        done

        # Set output for successful architectures
        if [ -s successful_arches.txt ]; then
          echo "successful_arches=$(paste -sd, successful_arches.txt)" >> $GITHUB_OUTPUT
        fi

    - name: Update tag reference
      if: steps.process-arches.outputs.successful_arches != ''
      run: |
        echo "${{ steps.get-tags.outputs.LATEST_TAG }}" > patches/last_processed_tag.txt

    - name: Commit and push changes
      if: steps.process-arches.outputs.successful_arches != ''
      run: |
        git add patches/runner-sdk8-*.patch
        git add patches/last_processed_tag.txt
        git commit -m "Update patches: ${{ steps.get-tags.outputs.PREVIOUS_TAG }} → ${{ steps.get-tags.outputs.LATEST_TAG }} [${{ steps.process-arches.outputs.successful_arches }}]"
        git pull --rebase origin $(git branch --show-current)
        git push