name: Build Shaka Packager

description: |
  A reusable action to build Shaka Packager.
  Leaves build artifacts in the "artifacts" folder.

inputs:
  os_name:
    description: The name of the OS (one word).  Appended to artifact filenames.
    required: true
  target_arch:
    description: The CPU architecture to target.  We support x64, arm64.
    required: true
  lib_type:
    description: A library type, either "static" or "shared".
    required: true
  build_type:
    description: A build type, either "Debug" or "Release".
    required: true
  build_type_suffix:
    description: A suffix to append to the build type in the output path.
    required: false
    default: ""
  exe_ext:
    description: The extension on executable files.
    required: false
    default: ""

runs:
  using: composite
  steps:
    - name: Select Xcode 10.3 and SDK 10.14 (macOS only)
      # NOTE: macOS 11 doesn't work with our (old) version of Chromium build,
      # and the latest Chromium build doesn't work with Packager's build
      # system.  To work around this, we need an older SDK version, and to
      # get that, we need an older XCode version.  XCode 10.3 has SDK 10.14,
      # which works.
      shell: bash
      run: |
        if [[ "${{ runner.os }}" == "macOS" ]]; then
          echo "::group::Select Xcode 10.3"
          sudo xcode-select -s /Applications/Xcode_10.3.app/Contents/Developer
          echo "::endgroup::"
        fi

    - name: Install depot tools
      shell: bash
      run: |
        echo "::group::Install depot_tools"
        git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
        echo "${GITHUB_WORKSPACE}/depot_tools" >> $GITHUB_PATH
        echo "::endgroup::"

    - name: Build ninja (arm only)
      shell: bash
      run: |
        # NOTE: There is no prebuilt copy of ninja for the "aarch64"
        # architecture (as reported by "uname -p" on arm64).  So we must build
        # our own, as recommended by depot_tools when it fails to fetch a
        # prebuilt copy for us.
        # NOTE 2: It turns out that $GITHUB_PATH operates like a stack.
        # Appending to that file places the new path at the beginning of $PATH
        # for the next step, so this step must come _after_ installing
        # depot_tools.
        if [[ "${{ inputs.target_arch }}" == "arm64" ]]; then
          echo "::group::Build ninja (arm-only)"
          git clone https://github.com/ninja-build/ninja.git -b v1.8.2
          # The --bootstrap option compiles ninja as well as configures it.
          # This is the exact command prescribed by depot_tools when it fails to
          # fetch a ninja binary for your platform.
          (cd ninja && ./configure.py --bootstrap)
          echo "${GITHUB_WORKSPACE}/ninja" >> $GITHUB_PATH
          echo "::endgroup::"
        fi

    - name: Configure gclient
      shell: bash
      run: |
        echo "::group::Configure gclient"
        gclient config https://github.com/google/shaka-packager.git --name=src --unmanaged
        echo "::endgroup::"

    - name: Sync gclient
      env:
        GYP_DEFINES: "target_arch=${{ inputs.target_arch }} libpackager_type=${{ inputs.lib_type }}_library"
        GYP_MSVS_VERSION: "2019"
        GYP_MSVS_OVERRIDE_PATH: "C:/Program Files (x86)/Microsoft Visual Studio/2019/Enterprise"
      shell: bash
      run: |
        echo "::group::Sync gclient"
        BUILD_CONFIG="${{ inputs.build_type }}-${{ inputs.lib_type }}"
        if [[ "$BUILD_CONFIG" == "Release-static" && "${{ runner.os }}" == "Linux" ]]; then
          # For static release builds, set these two additional flags for fully static binaries.
          export GYP_DEFINES="$GYP_DEFINES disable_fatal_linker_warnings=1 static_link_binaries=1"
        fi
        gclient sync
        echo "::endgroup::"

    - name: Build
      shell: bash
      run: |
        echo "::group::Build"
        ninja -C src/out/${{ inputs.build_type }}${{ inputs.build_type_suffix }}
        echo "::endgroup::"

    - name: Prepare artifacts (static release only)
      shell: bash
      run: |
        BUILD_CONFIG="${{ inputs.build_type }}-${{ inputs.lib_type }}"
        if [[ "$BUILD_CONFIG" != "Release-static" ]]; then
          echo "Skipping artifacts for $BUILD_CONFIG."
          exit 0
        fi
        if [[ "${{ runner.os }}" == "Linux" ]]; then
          echo "::group::Check for static executables"
          (
            cd src/out/Release${{ inputs.build_type_suffix }}
            # Prove that we built static executables on Linux.  First, check that
            # the executables exist, and fail if they do not.  Then check "ldd",
            # which will fail if the executable is not dynamically linked.  If
            # "ldd" succeeds, we fail the workflow.  Finally, we call "true" so
            # that the last executed statement will be a success, and the step
            # won't be failed if we get that far.
            ls packager mpd_generator >/dev/null || exit 1
            ldd packager 2>&1 && exit 1
            ldd mpd_generator 2>&1 && exit 1
            true
          )
          echo "::endgroup::"
        fi
        echo "::group::Prepare artifacts folder"
        mkdir artifacts
        ARTIFACTS="$GITHUB_WORKSPACE/artifacts"
        cd src/out/Release${{ inputs.build_type_suffix }}
        echo "::endgroup::"
        echo "::group::Strip executables"
        strip packager${{ inputs.exe_ext }}
        strip mpd_generator${{ inputs.exe_ext }}
        echo "::endgroup::"
        SUFFIX="-${{ inputs.os_name }}-${{ inputs.target_arch }}"
        EXE_SUFFIX="$SUFFIX${{ inputs.exe_ext}}"
        echo "::group::Copy packager"
        cp packager${{ inputs.exe_ext }} $ARTIFACTS/packager$EXE_SUFFIX
        echo "::endgroup::"
        echo "::group::Copy mpd_generator"
        cp mpd_generator${{ inputs.exe_ext }} $ARTIFACTS/mpd_generator$EXE_SUFFIX
        echo "::endgroup::"
        # The pssh-box bundle is OS and architecture independent.  So only do
        # it on this one OS and architecture, and give it a more generic
        # filename.
        if [[ '${{ inputs.os_name }}' == 'linux' && '${{ inputs.target_arch }}' == 'x64' ]]; then
          echo "::group::Tar pssh-box"
          tar -czf $ARTIFACTS/pssh-box.py.tar.gz pyproto pssh-box.py
          echo "::endgroup::"
        fi