# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
# Exceptions. See /LICENSE for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

name: test

on:
  push:
    branches: [trunk]
    paths:
      # Conservatively run the tests. However, skip them if the only paths in
      # the pull request match files that we know don't impact the build.
      - '**'
      - '!**/*.md'
      - '!LICENSE'
      - '!CODEOWNERS'
      - '!.git*'
  pull_request_target:
    paths:
      # Conservatively run the tests. However, skip them if the only paths in
      # the pull request match files that we know don't impact the build.
      - '**'
      - '!**/*.md'
      - '!LICENSE'
      - '!CODEOWNERS'
      - '!.git*'

jobs:
  test:
    strategy:
      matrix:
        os: [ubuntu-latest, macos-latest]
        build_mode: [fastbuild, opt]
    runs-on: ${{ matrix.os }}
    steps:
      # Checkout the pull request head or the branch.
      - name: Checkout pull request
        if: github.event_name == 'pull_request_target'
        uses: actions/checkout@v2
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          submodules: true

      - name: Checkout branch
        if: github.event_name != 'pull_request_target'
        uses: actions/checkout@v2
        with:
          submodules: true

      # Setup Python and related tools.
      - uses: actions/setup-python@v2
        with:
          # Match the min version listed in docs/project/contribution_tools.md
          python-version: '3.6'

      # On macOS we need Go and to use it to install Bazelisk.
      - uses: actions/setup-go@v2
        if: matrix.os == 'macos-latest'
      - name: Install bazelisk
        if: matrix.os == 'macos-latest'
        run: |
          go get github.com/bazelbuild/bazelisk
          echo "$(go env GOPATH)/bin" >> $GITHUB_PATH

      # Setup to the latest LLVM and Clang release on Linux runners.
      #
      # Ideally we would use the pre-installed versions in the image, but the
      # debian packages for LLVM-12 are broken due to several bugs:
      # https://bugs.llvm.org/show_bug.cgi?id=43604
      # https://bugs.llvm.org/show_bug.cgi?id=46321
      #
      # For now, we rely on Homebrew to manage installing a correctly built
      # toolchain. We also take some care to be as resilient as possible to
      # issues fetching and installing the toolchain.
      - name: Setup LLVM and Clang on Ubuntu
        if: matrix.os == 'ubuntu-latest'
        run: |
          brew update
          brew install --force-bottle --only-dependencies llvm
          brew install --force-bottle --force --verbose llvm
          brew info llvm
          brew config
          echo "$(brew --prefix llvm)/bin" >> $GITHUB_PATH

      # Just add the Homebrew installed LLVM to the path on macOS, the image has
      # LLVM-12 pre-installed.
      - name: Setup LLVM and Clang on macOS
        if: matrix.os == 'macos-latest'
        run: |
          echo "$(brew --prefix llvm)/bin" >> $GITHUB_PATH

      # Print the various tool paths and versions to help in debugging.
      - name: Print tool debugging info
        run: |
          echo $PATH
          which bazelisk
          bazelisk --version
          which python
          python --version
          which clang
          clang --version
          which clang++
          clang++ --version
          which clang-format
          clang-format --version

      # Extract our access key for our build cache.
      - name: Extract access key
        env:
          GCP_BUILDS_SERVICE_ACCOUNT: ${{ secrets.GCP_BUILDS_SERVICE_ACCOUNT }}
        run: |
          echo "$GCP_BUILDS_SERVICE_ACCOUNT" \
            | base64 -d > $HOME/gcp-builds-service-account.json

      # Add our bazel configuration and print basic info to ease debugging.
      - name: Configure Bazel and print info
        run: |
          cat >user.bazelrc <<EOF
          # Enable remote cache for our CI.
          build --remote_cache=https://storage.googleapis.com/carbon-builds-github-${{ matrix.os }}
          build --google_credentials=$HOME/gcp-builds-service-account.json

          # General build options.
          build --verbose_failures
          test --test_output=errors
          EOF
          bazelisk info

      # Build all targets first to isolate build failures.
      - name: Build (${{ matrix.build_mode }})
        run: bazelisk build -c ${{ matrix.build_mode }} //...:all

      # Run all test targets.
      - name: Test (${{ matrix.build_mode }})
        run: bazelisk test -c ${{ matrix.build_mode }} //...:all