name: Build, lint, and test

on: [push, pull_request]

env:
  # Don't mix these up!
  # runner.workspace = /home/runner/work/serenity
  # github.workspace = /home/runner/work/serenity/serenity
  SERENITY_SOURCE_DIR: ${{ github.workspace }}

jobs:
  build_and_test_serenity:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        debug-macros: ['ALL_DEBUG', 'NORMAL_DEBUG']
        os: [ubuntu-20.04]
        # If ccache is broken and you would like to bust the ccache cache on Github Actions, increment this:
        ccache-mark: [0]

    steps:
    - uses: actions/checkout@v2
    # Set default Python to python 3.x, and set Python path such that pip install works properly
    - uses: actions/setup-python@v2

    # === OS SETUP ===

    # Do we need to update the package cache first?
    # sudo apt-get update -qq

    - name: Purge interfering packages
      # Remove GCC 9 and clang-format 10 (installed by default)
      run: sudo apt-get purge -y gcc-9 g++-9 libstdc++-9-dev clang-format-10
    - name: "Install Ubuntu dependencies"
      # These packages are already part of the ubuntu-20.04 image:
      # cmake gcc-10 g++-10 shellcheck libgmp-dev
      # Packages below aren't.
      #
      # We add the canonical-server/server-backports PPA to get updated QEMU releases without having to manage
      #    yet another cache in github actions
      run: |
        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
        sudo add-apt-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-11 main"
        sudo add-apt-repository ppa:canonical-server/server-backports
        sudo apt-get update
        sudo apt-get install clang-format-11 libstdc++-10-dev libmpfr-dev libmpc-dev ninja-build npm e2fsprogs qemu-utils qemu-system-i386 ccache
    - name: Use GCC 10 instead
      run: sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 60 --slave /usr/bin/g++ g++ /usr/bin/g++-10

    - name: Install JS dependencies
      run: sudo npm install -g prettier@2.2.1
    - name: Install Python dependencies
      # The setup-python action set default python to python3.x. Note that we are not using system python here.
      run: |
        python -m pip install --upgrade pip
        pip install flake8 requests
    - name: Check versions
      run: set +e; g++ --version; g++-10 --version; clang-format --version; clang-format-11 --version; prettier --version; python --version; python3 --version; ninja --version; flake8 --version; ccache --version; qemu-system-i386 --version

    # === PREPARE FOR BUILDING ===

    - name: Lint (Phase 1/2)
      run: ${{ github.workspace }}/Meta/lint-ci.sh
    - name: Prepare useful stamps
      id: stamps
      shell: cmake -P {0}
      run: |
        string(TIMESTAMP current_date "%Y_%m_%d_%H_%M_%S" UTC)
        # Output everything twice to make it visible both in the logs
        # *and* as actual output variable, in this order.
        message("  set-output name=time::${current_date}")
        message("::set-output name=time::${current_date}")
        message("  set-output name=libc_headers::${{ hashFiles('Userland/Libraries/LibC/**/*.h', 'Userland/Libraries/LibPthread/**/*.h', 'Toolchain/Patches/*.patch', 'Toolchain/BuildIt.sh') }}")
        message("::set-output name=libc_headers::${{ hashFiles('Userland/Libraries/LibC/**/*.h', 'Userland/Libraries/LibPthread/**/*.h', 'Toolchain/Patches/*.patch', 'Toolchain/BuildIt.sh') }}")
    - name: Toolchain cache
      uses: actions/cache@v2
      with:
        path: ${{ github.workspace }}/Toolchain/Cache/
        # This assumes that *ALL* LibC and LibPthread headers have an impact on the Toolchain.
        # This is wrong, and causes more Toolchain rebuilds than necessary.
        # However, we want to avoid false cache hits at all costs.
        key: ${{ runner.os }}-toolchain-i686-${{ steps.stamps.outputs.libc_headers }}
    - name: Restore or regenerate Toolchain
      run: TRY_USE_LOCAL_TOOLCHAIN=y ${{ github.workspace }}/Toolchain/BuildIt.sh
    - name: ccache(1) cache
      # Pull the ccache *after* building the toolchain, in case building the Toolchain somehow interferes.
      uses: actions/cache@v2
      with:
        path: /home/runner/.ccache
        # If you're here because ccache broke (it never should), increment matrix.ccache-mark.
        # We want to always reuse the last cache, but upload a new one.
        # This is achieved by using the "prefix-timestamp" format,
        # and permitting the restore-key "prefix-" without specifying a timestamp.
        # For this trick to work, the timestamp *must* come last, and it *must* be missing in 'restore-keys'.
        key: ${{ runner.os }}-ccache-i686-v${{ matrix.ccache-mark }}-D${{ matrix.debug-macros }}-toolchain_${{steps.stamps.outputs.libc_headers}}-time${{ steps.stamps.outputs.time }}
        # IMPORTANT: Keep these two in sync!
        restore-keys: |
          ${{ runner.os }}-ccache-i686-v${{ matrix.ccache-mark }}-D${{ matrix.debug-macros }}-toolchain_${{steps.stamps.outputs.libc_headers}}-
    - name: Show ccache stats before build and configure
      run: |
        # We only have 5 GiB of cache available *in total*. Beyond that, GitHub deletes caches.
        # Currently, we use about 65 MB for the toolchain, and two ccache caches:
        # One with ALL_DEBUG and one with NORMAL_DEBUG.
        # Therefore, using 2.47 GB or more per ccache cache causes disaster.
        # Building from scratch fills the ccache cache from 0 to about 0.7 GB, so 1.5 GB is plenty.
        ccache -M 1500M
        ccache -s
    - name: Create build environment with debug macros
      working-directory: ${{ github.workspace }}
      # Build the entire project with debug macros turned on, to prevent code rot.
      # However, it is unweildy and slow to run tests with them enabled, so we will build twice.
      run: |
        mkdir -p Build
        cd Build
        cmake .. -GNinja -DBUILD_LAGOM=ON -DENABLE_ALL_THE_DEBUG_MACROS=ON -DENABLE_PCI_IDS_DOWNLOAD=OFF -DCMAKE_C_COMPILER=gcc-10 -DCMAKE_CXX_COMPILER=g++-10
      if: ${{ matrix.debug-macros == 'ALL_DEBUG' }}
    - name: Create build environment
      working-directory: ${{ github.workspace }}
      # Note that this needs to run *even if* the Toolchain was built,
      # in order to set options like BUILD_LAGOM.
      run: |
        mkdir -p Build
        cd Build
        cmake .. -GNinja -DBUILD_LAGOM=ON -DENABLE_PCI_IDS_DOWNLOAD=OFF -DCMAKE_C_COMPILER=gcc-10 -DCMAKE_CXX_COMPILER=g++-10
      if: ${{ matrix.debug-macros == 'NORMAL_DEBUG' }}

    # === ACTUALLY BUILD ===

    - name: Build Serenity and Tests
      working-directory: ${{ github.workspace }}/Build
      run: cmake --build .
    - name: Show ccache stats after build
      run: ccache -s
    - name: Lint (Phase 2/2)
      working-directory: ${{ github.workspace }}/Meta
      run: ./check-symbols.sh

    - name: Create Serenity Rootfs
      if: ${{ matrix.debug-macros == 'NORMAL_DEBUG'}}
      working-directory: ${{ github.workspace }}/Build
      run: ninja install && ninja image

    - name: Run On-Target Tests
      if: ${{ matrix.debug-macros == 'NORMAL_DEBUG'}}
      working-directory: ${{ github.workspace }}/Build
      env:
        SERENITY_QEMU_CPU: "max,vmx=off"
        SERENITY_KERNEL_CMDLINE: "boot_mode=self-test"
        SERENITY_RUN: "ci"
      run: |
        echo "::group::ninja run # Qemu output"
        ninja run
        echo "::endgroup::"
        echo "::group::Verify Output File"
        mkdir fsmount
        sudo mount -t ext2 -o loop,rw _disk_image fsmount
        echo "Results: "
        sudo cat fsmount/home/anon/test-results.log
        if ! sudo grep -q "Failed: 0" fsmount/home/anon/test-results.log
        then
          echo "::error :^( Tests failed, failing job"
          exit 1
        fi
        echo "::endgroup::"
      timeout-minutes: 30

    - name: Print Target Logs
      # Extremely useful if Serenity hangs trying to run one of the tests
      if: ${{ !cancelled() && matrix.debug-macros == 'NORMAL_DEBUG'}}
      working-directory: ${{ github.workspace }}/Build
      run: '[ ! -e debug.log ] || cat debug.log'

  build_and_test_lagom:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - with-fuzzers: FUZZ
            os: ubuntu-20.04
            allow-test-failure: false
          - with-fuzzers: NO_FUZZ
            os: ubuntu-20.04
            allow-test-failure: false
          - with-fuzzers: NO_FUZZ
            os: macos-10.15
            allow-test-failure: true

    steps:
    - uses: actions/checkout@v2

    # === OS SETUP ===
    #
    - name: Install Ubuntu dependencies
      run: |
        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
        sudo add-apt-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-12 main"
        sudo apt-get purge -y clang-10 clang-11
        sudo apt-get update
        sudo apt-get install clang-12 ninja-build
        sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-12 100
        sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-12 100
      if: ${{ runner.os == 'Linux' }}
    - name: Install macOS dependencies
      run: brew install ninja
      if: ${{ runner.os == 'macOS' }}
    - name: Check versions
      run: set +e; clang --version; clang++ --version; ninja --version

    # === PREPARE FOR BUILDING ===

    # TODO: ccache
    # https://cristianadam.eu/20200113/speeding-up-c-plus-plus-github-actions-using-ccache/
    # https://github.com/cristianadam/HelloWorld/blob/master/.github/workflows/build_cmake.yml
    # Ignore for now, since the other step dominates
    - name: Create build environment (fuzz)
      working-directory: ${{ github.workspace }}/Meta/Lagom
      run: |
        mkdir -p Build
        cd Build
        cmake -GNinja -DBUILD_LAGOM=ON -DENABLE_FUZZER_SANITIZER=ON -DENABLE_ADDRESS_SANITIZER=ON -DENABLE_PCI_IDS_DOWNLOAD=OFF -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ ..
      if: ${{ matrix.with-fuzzers == 'FUZZ' }}

    - name: Create build environment (no fuzz)
      working-directory: ${{ github.workspace }}/Meta/Lagom
      run: |
        mkdir -p Build
        cd Build
        cmake -GNinja -DBUILD_LAGOM=ON -DENABLE_UNDEFINED_SANITIZER=ON -DENABLE_ADDRESS_SANITIZER=ON -DENABLE_PCI_IDS_DOWNLOAD=OFF -DCMAKE_C_COMPILER=gcc-10 -DCMAKE_CXX_COMPILER=g++-10 ..
      if: ${{ matrix.with-fuzzers == 'NO_FUZZ' }}

    # === ACTUALLY BUILD AND TEST ===

    - name: Build Lagom
      working-directory: ${{ github.workspace }}/Meta/Lagom/Build
      run: cmake --build .

    - name: Run CMake tests
      working-directory: ${{ github.workspace }}/Meta/Lagom/Build
      run: ninja test || ${{ matrix.allow-test-failure }}
      timeout-minutes: 4
      env:
        CTEST_OUTPUT_ON_FAILURE: 1
        UBSAN_OPTIONS: "halt_on_error=1"
      if: ${{ matrix.with-fuzzers == 'NO_FUZZ' }}

  lint_commits:
    runs-on: ubuntu-20.04
    if: always() && github.event_name == 'pull_request'

    steps:
    - name: Get PR Commits
      id: 'get-pr-commits'
      uses: tim-actions/get-pr-commits@55b867b9b28954e6f5c1a0fe2f729dc926c306d0
      with:
        token: ${{ secrets.GITHUB_TOKEN }}

    - name: Check linebreaks
      if: ${{ success() || failure() }}
      uses: tim-actions/commit-message-checker-with-regex@v0.3.1
      with:
        commits: ${{ steps.get-pr-commits.outputs.commits }}
        pattern: '^[^\r]*$'
        error: 'Commit message contains CRLF line breaks (only unix-style LF linebreaks are allowed)'

    - name: Check Line Length
      uses: tim-actions/commit-message-checker-with-regex@v0.3.1
      with:
        commits: ${{ steps.get-pr-commits.outputs.commits }}
        pattern: '^.{0,72}(\n.{0,72})*$'
        error: 'Commit message lines are too long (maximum allowed is 72 characters)'

    - name: Check subsystem
      if: ${{ success() || failure() }}
      uses: tim-actions/commit-message-checker-with-regex@v0.3.1
      with:
        commits: ${{ steps.get-pr-commits.outputs.commits }}
        pattern: '^\S.*?: .+'
        error: 'Missing category in commit title (if this is a fix up of a previous commit, it should be squashed)'

    - name: Check title
      if: ${{ success() || failure() }}
      uses: tim-actions/commit-message-checker-with-regex@v0.3.1
      with:
        commits: ${{ steps.get-pr-commits.outputs.commits }}
        pattern: '^.+[^.\n](\n.*)*$'
        error: 'Commit title ends in a period'

  notify_irc:
    needs: [build_and_test_serenity, build_and_test_lagom, lint_commits]
    runs-on: ubuntu-20.04
    if: always() && github.repository == 'SerenityOS/serenity' && (github.event_name == 'pull_request' || (github.event_name == 'push' && github.ref == 'refs/heads/master'))

    steps:
    - uses: actions/checkout@v2
    # Sets environment variable env.WORKFLOW_CONCLUSION to one of [neutral, success, skipped, cancelled, timed_out, action_required, failure]
    # depending on result of all needs jobs
    - uses: technote-space/workflow-conclusion-action@v2

    # === NOTIFICATIONS ===

    - name: Dump event info
      if: always()
      # Usually unnecessary, but insanely useful if IRC notifications fail.
      run: |
        cat <<"EOF"
        ${{ toJSON(github.event) }}
        ${{ toJSON(needs) }}
        EOF
    - name: Generate IRC message
      if: always()
      run: |
        ${{ github.workspace }}/Meta/notify_irc.py <<"EOF"
        ["${{ github.actor }}", ${{ github.run_id }}, "${{ env.WORKFLOW_CONCLUSION }}",
        ${{ toJSON(github.event) }}
        ]
        EOF