swift-protobuf/.github/workflows/update_protobuf.yml

name: Update Protobuf and Abseil Submodules

permissions:
  contents: write
  pull-requests: write

on:
  schedule:
    # Every night at 2am UTC
    - cron: '0 2 * * *'
  workflow_dispatch:

jobs:
  check-and-update:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
      uses: actions/checkout@v4
      with:
        submodules: true
        token: ${{ secrets.GITHUB_TOKEN }}

    - name: Check for new protobuf release
      id: check_release
      run: |
        # Get the latest protobuf release tag
        LATEST_TAG=$(curl -s https://api.github.com/repos/protocolbuffers/protobuf/releases/latest | jq -r '.tag_name')
        echo "Latest protobuf release: $LATEST_TAG"

        # Get current protobuf submodule commit
        cd Sources/protobuf/protobuf
        CURRENT_TAG=$(git describe --tags --exact-match 2>/dev/null || echo "none")
        echo "Current protobuf version: $CURRENT_TAG"
        cd ../../..

        # Check if update is needed
        if [ "$LATEST_TAG" != "$CURRENT_TAG" ] && [ "$LATEST_TAG" != "null" ]; then
          echo "needs_update=true" >> $GITHUB_OUTPUT
          echo "latest_tag=$LATEST_TAG" >> $GITHUB_OUTPUT
          echo "Update needed: $CURRENT_TAG -> $LATEST_TAG"
        else
          echo "needs_update=false" >> $GITHUB_OUTPUT
          echo "No update needed"
        fi

    - name: Update protobuf submodule
      if: steps.check_release.outputs.needs_update == 'true'
      run: |
        cd Sources/protobuf/protobuf
        git fetch --tags
        git checkout ${{ steps.check_release.outputs.latest_tag }}
        cd ../../..

    - name: Determine required abseil version
      if: steps.check_release.outputs.needs_update == 'true'
      id: check_abseil
      run: |
        # Extract abseil commit from protobuf_deps.bzl
        ABSEIL_COMMIT=$(grep -A 10 '"com_google_absl"' Sources/protobuf/protobuf/protobuf_deps.bzl | grep 'commit' | head -1 | sed 's/.*"\([a-f0-9]*\)".*/\1/')

        if [ -z "$ABSEIL_COMMIT" ]; then
          echo "Error: Could not determine abseil commit"
          exit 1
        fi

        echo "Required abseil commit: $ABSEIL_COMMIT"
        echo "abseil_commit=$ABSEIL_COMMIT" >> $GITHUB_OUTPUT

    - name: Update abseil submodule
      if: steps.check_release.outputs.needs_update == 'true'
      run: |
        cd Sources/protobuf/abseil
        git fetch
        git checkout ${{ steps.check_abseil.outputs.abseil_commit }}
        cd ../../..

    - name: Stage submodule updates
      if: steps.check_release.outputs.needs_update == 'true'
      run: |
        git add Sources/protobuf/protobuf
        git add Sources/protobuf/abseil

    - name: Get abseil version info
      if: steps.check_release.outputs.needs_update == 'true'
      id: abseil_info
      run: |
        cd Sources/protobuf/abseil
        ABSEIL_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "commit ${{ steps.check_abseil.outputs.abseil_commit }}")
        echo "abseil_version=$ABSEIL_TAG" >> $GITHUB_OUTPUT
        cd ../../..

    - name: Create Pull Request
      if: steps.check_release.outputs.needs_update == 'true'
      uses: peter-evans/create-pull-request@v6
      with:
        token: ${{ secrets.GITHUB_TOKEN }}
        commit-message: |
          Update protobuf to ${{ steps.check_release.outputs.latest_tag }} and abseil-cpp

          - Update protobuf submodule to ${{ steps.check_release.outputs.latest_tag }}
          - Update abseil-cpp submodule to ${{ steps.abseil_info.outputs.abseil_version }}
        branch: automated/update-protobuf-${{ steps.check_release.outputs.latest_tag }}
        delete-branch: true
        title: 'Update protobuf to ${{ steps.check_release.outputs.latest_tag }}'
        body: |
          ## Automated Protobuf Update

          This PR automatically updates the protobuf and abseil-cpp submodules to their latest versions.

          ### Changes
          - **Protobuf**: Updated to `${{ steps.check_release.outputs.latest_tag }}`
          - **Abseil-cpp**: Updated to `${{ steps.abseil_info.outputs.abseil_version }}`

          ### Release Notes
          See the [protobuf ${{ steps.check_release.outputs.latest_tag }} release notes](https://github.com/protocolbuffers/protobuf/releases/tag/${{ steps.check_release.outputs.latest_tag }}) for details.

          ---

          *This PR was automatically created by the [Update Protobuf workflow](https://github.com/${{ github.repository }}/actions/workflows/update_protobuf.yml)*