cx_build_compare.yml

name: Compare Build Outputs

on:
  pull_request:
    types: [labeled]

concurrency:
    group: ci-${{github.workflow}}-${{ github.ref }}
    cancel-in-progress: true
      
jobs:
  build-and-compare:
    if: github.event.label.name == 'CX_NO_CODE_CHANGE'
    runs-on: ubuntu-20.04

    container: ardupilot/ardupilot-dev-${{ matrix.toolchain }}:v0.0.29
    strategy:
      fail-fast: false  # don't cancel if a job from the matrix fails
      matrix:
        toolchain: [
            chibios,
        ]
        gcc: [10]
        exclude:
          - gcc: 10
            toolchain: chibios-clang
        board: ["CarbonixCubeOrange", "Volanti-M1", "Volanti-M2", "Volanti-M3", "Volanti-M4", "Volanti-M5", "Volanti-LWing", "Volanti-RWing", "Volanti-LTail", "Volanti-RTail", "Ottano-M1", "Ottano-M2", "Ottano-M3", "Ottano-M4", "Ottano-M5", "Ottano-LWing", "Ottano-RWing", "Ottano-LTail", "Ottano-RTail"]        
    steps:
      # git checkout the PR
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
          submodules: 'recursive'

      # Put ccache into github cache for faster build
      - name: Prepare ccache timestamp
        id: ccache_cache_timestamp
        run: |
          NOW=$(date -u +"%F-%T")
          echo "timestamp=${NOW}" >> $GITHUB_OUTPUT

      - name: ccache cache files
        uses: actions/cache@v3
        with:
          path: ~/.ccache
          key: ${{github.workflow}}-ccache-${{steps.ccache_cache_timestamp.outputs.timestamp}}
          restore-keys: ${{github.workflow}}-ccache-  # restore ccache from either previous build on this branch or on master
      
      - name: setup ccache
        run: |
          . .github/workflows/ccache.env
      
      - name: Check if Hwdef directory has been modified
        run: |
          git fetch origin ${{ github.event.pull_request.base.ref }}
          CHANGED=$(git diff --quiet HEAD origin/${{ github.event.pull_request.base.ref }} -- libraries/AP_HAL_ChibiOS/hwdef || echo "changed")
          if [ "$CHANGED" = "changed" ]; then
            echo "Directory has been modified"
            exit 1
          fi

      - name: Build Head and ${{ github.event.pull_request.base.ref }} ${{matrix.board}} 
        shell: bash
        run: |
            git config --global --add safe.directory ${GITHUB_WORKSPACE}
            PATH="/github/home/.local/bin:$PATH"

            # export some environment variables designed to get
            # repeatable builds from the same source:
            export CHIBIOS_GIT_VERSION="12345678"
            export GIT_VERSION="abcdef"
            export GIT_VERSION_INT="15"
            ./waf configure --board ${{matrix.board}} 

            ./Tools/Carbonix_scripts/build_no_clean.sh ${{ matrix.board }}
  
            NO_VERSIONS_DIR="$GITHUB_WORKSPACE/${{matrix.board}}/pr_bin_no_versions"
            mkdir -p "$NO_VERSIONS_DIR"  
            cp -r build/${{matrix.board}}/bin/* "$NO_VERSIONS_DIR"

            echo [`date`] Built Base with no versions

            git checkout ${{ github.event.pull_request.base.ref }} 

            # export some environment variables designed to get
            # repeatable builds from the same source:
            
            export CHIBIOS_GIT_VERSION="12345678"
            export GIT_VERSION="abcdef"
            export GIT_VERSION_INT="15"
            ./Tools/Carbonix_scripts/build_no_clean.sh ${{ matrix.board }}

            NO_VERSIONS_DIR="$GITHUB_WORKSPACE/${{matrix.board}}/base_branch_bin_no_versions"
            mkdir -p "$NO_VERSIONS_DIR"
            cp -r build/${{matrix.board}}/bin/* "$NO_VERSIONS_DIR"

            echo [`date`] Built ${{ github.event.pull_request.base.ref }} with no versions
      
      - name: Upload Artifacts
        uses: actions/upload-artifact@v2
        with:
          name: ${{ matrix.board }}
          path: ${{ github.workspace }}/${{ matrix.board }}
          if-no-files-found: warn
          retention-days: 7

      - name: Compare build outputs
        shell: bash
        run: |
          git config --global --add safe.directory ${GITHUB_WORKSPACE}
          PATH="/github/home/.local/bin:$PATH"
          differences_found=0

          for base_file in $GITHUB_WORKSPACE/${{ matrix.board }}/base_branch_bin_no_versions/*.bin
          do
            base_filename=$(basename "$base_file")
            diff_output=$(diff $base_file $GITHUB_WORKSPACE/${{ matrix.board }}/pr_bin_no_versions/$base_filename) || true
            if [ "$diff_output" != "" ]; then
              echo Failed -- Comparing $base_file and $GITHUB_WORKSPACE/${{ matrix.board }}/pr_bin_no_versions/$base_filename resulted in $diff_output 
              differences_found=1
            else
              echo Passed -- Comparing $base_file and $GITHUB_WORKSPACE/${{ matrix.board }}/pr_bin_no_versions/$base_filename
            fi
          done
          if [ $differences_found -eq 1 ]; then
            exit 1
          fi