name: Clang

on:
  push:
    branches: [ master ]
  pull_request:
    # The branches below must be a subset of the branches above
    branches: [ master ]
  schedule:
    - cron: '23 13 * * 3'

jobs:
  analyze:
    name: Analyze
    runs-on: ubuntu-20.04

    steps:
    - name: Install dependencies
      run: sudo apt-get install clang-tools libsnmp-dev

    - name: Checkout repository
      uses: actions/checkout@v2
      with:
        submodules: true

    # Run clang analyzer.
    #
    # Detect if issues were found and upload SARIF report only in that
    # case, because reports without entries are not accepted. See
    # https://github.com/github/codeql-action/issues/390. The analyzer
    # is run twice in order to get a SARIF report as well as an exit
    # status when issues are detected, as the scan-build --status-bugs
    # parameter doesn't work when the output format is SARIF.

    - name: Run analyzer
      id: analyze
      continue-on-error: true
      run: |
          cmake -E make_directory ${{github.workspace}}/build.clang
          scan-build cmake \
             -B ${{github.workspace}}/build.clang \
             -S ${{github.workspace}} \
             -DPNET_OPTION_SNMP=ON \
             -DBUILD_TESTING=OFF \
             -DCMAKE_BUILD_TYPE=Release
          scan-build \
             -sarif \
             -o ${{github.workspace}}/sarif \
             make \
               -C ${{github.workspace}}/build.clang \
               -j4
          cmake --build ${{github.workspace}}/build.clang --target clean
          scan-build \
             --status-bugs \
             make \
               -C ${{github.workspace}}/build.clang \
               -j4

    - name: Merge results if any
      if: steps.analyze.outcome == 'failure'
      uses: microsoft/sarif-actions@v0.1
      with:
        command: 'merge sarif/*/*.sarif'

    - name: Upload results if any
      if: steps.analyze.outcome == 'failure'
      uses: github/codeql-action/upload-sarif@v1
      with:
        sarif_file: ${{github.workspace}}/merged.sarif