name: Run Conformance Tests

# This workflow is a subset of the build.yml. It *only* try to run the
# conformance checks. It is triggered weekly on a cron to catch when new
# conformance tests are added and they don't pass.
#
# Without this workflow the new tests wouldn't be noticed until a PR was made.
#
# This workflow shares the caching logic with build.yml. It should serve to
# update a subset of the caches for when things do land on trunk. If that
# is deemed not worth it in the future, this can be simplify.

# NOTE: If making changes to most of the steps, please also look to update
# build.yml also.
permissions:
  contents: read

on:
  schedule:
    # Every Sunday at 5am.
    - cron: '0 5 * * 0'
  # Also allow manual triggering from the github UX to revalidate things.
  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        # We "float" the bug fix so we pick up new ones. This helps since the GitHub CI
        # is set to ensure the actions pass, thus updates are only needed when the
        # "major.minor" pairs changes.
        #
        # Looking at https://hub.docker.com/_/swift, the version only tags (i.e. - 6.1)
        # could use different Ubuntu releases. At the moment they are all the "noble",
        # which is also what would be desired, so we don't bother listing explicit ones.
        swift:
        - "6.2"
    container:
      image: swift:${{ matrix.swift }}
    steps:
    - name: Checkout
      uses: actions/checkout@v4
      with:
        submodules: true
    - name: Update and install dependencies
      # dependencies from https://github.com/protocolbuffers/protobuf/blob/main/src/README.md
      run: apt-get update && apt-get install -y make g++ cmake
    - name: Build protobuf
      working-directory: Sources/protobuf/protobuf
      # https://github.com/protocolbuffers/protobuf/blob/main/cmake/README.md#c-version
      run: |
        mkdir cmake_build
        cd cmake_build
        cmake \
          -DCMAKE_CXX_STANDARD=17 \
          -DCMAKE_BUILD_TYPE=Release \
          -Dprotobuf_BUILD_TESTS=OFF \
          -Dprotobuf_INSTALL=OFF \
          -Dprotobuf_BUILD_CONFORMANCE=ON \
          -S ..
        NUM_CPUS=$(getconf _NPROCESSORS_ONLN)
        make -j "${NUM_CPUS}" protoc conformance_test_runner
    - name: Test conformance
      run: make test-conformance CONFORMANCE_TEST_RUNNER=Sources/protobuf/protobuf/cmake_build/conformance_test_runner