static_checks.yml

# Contains jobs corresponding to static checks (such as syntax correctness & prohibited patterns).

name: Static Checks

on:
  workflow_dispatch:
  pull_request:
  push:
    branches:
      - develop

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
  cancel-in-progress: true

jobs:
  check_codeowners:
    name: Check CODEOWNERS & Repository files
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v2

      - uses: mszostok/codeowners-validator@v0.5.1
        with:
          checks: "duppatterns,files,syntax"
          experimental_checks: "notowned"

  check_base_branch:
    name: Check base branch
    runs-on: ubuntu-20.04
    if: github.event_name == 'pull_request'
    steps:
      - name: "Branch is not based on develop or release branch"
        if: ${{ github.base_ref != 'develop' && !startsWith(github.base_ref, 'release-') }}
        run: |
          echo "Current base branch: $BASE_BRANCH"
          echo "Note: this check is expected to fail for chained PRs so that they can't accidentally be merged. PRs should only ever be merged directly into develop or a release branch."
          exit 1
        env:
          BASE_BRANCH: ${{ github.base_ref }}

      - name: "Branch verified as based on develop/release branch"
        if: ${{ github.base_ref == 'develop' || startsWith(github.base_ref, 'release-') }}
        run: |
          echo "Branch is correctly branched off of valid base branch to merge PRs into: $BASE_BRANCH"
        env:
          BASE_BRANCH: ${{ github.base_ref }}

  linters:
    name: Lint Tests
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v2

      - name: Create oppia android tools directory
        run: mkdir -p $HOME/oppia-android-tools

      - name: Set up JDK 11
        uses: actions/setup-java@v1
        with:
          java-version: 11

      - name: Download Checkstyle
        run: |
          cd $HOME/oppia-android-tools
          bash /home/runner/work/oppia-android/oppia-android/scripts/checkstyle_download.sh

      - name: Download Ktlint
        run: |
          cd $HOME/oppia-android-tools
          bash /home/runner/work/oppia-android/oppia-android/scripts/ktlint_download.sh

      - name: Download Buf
        run: |
          cd $HOME/oppia-android-tools
          bash /home/runner/work/oppia-android/oppia-android/scripts/buf_download.sh

      - name: Download Buildifier
        run: |
          cd $HOME/oppia-android-tools
          bash /home/runner/work/oppia-android/oppia-android/scripts/buildifier_download.sh

      - name: Java lint check
        run: |
          bash /home/runner/work/oppia-android/oppia-android/scripts/checkstyle_lint_check.sh $HOME

      - name: Kotlin lint check
        run: |
          bash /home/runner/work/oppia-android/oppia-android/scripts/ktlint_lint_check.sh $HOME

      - name: Feature flag checks
        run: |
          bash /home/runner/work/oppia-android/oppia-android/scripts/feature_flags_check.sh $HOME

      - name: Protobuf lint check
        run: |
          bash /home/runner/work/oppia-android/oppia-android/scripts/buf_lint_check.sh $HOME

      - name: Bazel lint check
        run: |
          bash /home/runner/work/oppia-android/oppia-android/scripts/buildifier_lint_check.sh $HOME

  script_checks:
    name: Script Checks
    runs-on: ubuntu-20.04
    env:
      CACHE_DIRECTORY: ~/.bazel_cache
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Set up Bazel
        uses: abhinavsingh/setup-bazel@v3
        with:
          version: 6.5.0

      - uses: actions/cache@v2
        id: scripts_cache
        with:
          path: ${{ env.CACHE_DIRECTORY }}
          key: ${{ runner.os }}-${{ env.CACHE_DIRECTORY }}-bazel-scripts-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-${{ env.CACHE_DIRECTORY }}-bazel-scripts-
            ${{ runner.os }}-${{ env.CACHE_DIRECTORY }}-bazel-

      # This check is needed to ensure that Bazel's unbounded cache growth doesn't result in a
      # situation where the cache never updates (e.g. due to exceeding GitHub's cache size limit)
      # thereby only ever using the last successful cache version. This solution will result in a
      # few slower CI actions around the time cache is detected to be too large, but it should
      # incrementally improve thereafter.
      - name: Ensure cache size
        env:
          BAZEL_CACHE_DIR: ${{ env.CACHE_DIRECTORY }}
        run: |
          # See https://stackoverflow.com/a/27485157 for reference.
          EXPANDED_BAZEL_CACHE_PATH="${BAZEL_CACHE_DIR/#\~/$HOME}"
          CACHE_SIZE_MB=$(du -smc $EXPANDED_BAZEL_CACHE_PATH | grep total | cut -f1)
          echo "Total size of Bazel cache (rounded up to MBs): $CACHE_SIZE_MB"
          # Use a 4.5GB threshold since actions/cache compresses the results, and Bazel caches seem
          # to only increase by a few hundred megabytes across changes for unrelated branches. This
          # is also a reasonable upper-bound (local tests as of 2021-03-31 suggest that a full build
          # of the codebase (e.g. //...) from scratch only requires a ~2.1GB uncompressed/~900MB
          # compressed cache).
          if [[ "$CACHE_SIZE_MB" -gt 4500 ]]; then
            echo "Cache exceeds cut-off; resetting it (will result in a slow build)"
            rm -rf $EXPANDED_BAZEL_CACHE_PATH
          fi

      - name: Configure Bazel to use a local cache
        env:
          BAZEL_CACHE_DIR: ${{ env.CACHE_DIRECTORY }}
        run: |
          EXPANDED_BAZEL_CACHE_PATH="${BAZEL_CACHE_DIR/#\~/$HOME}"
          echo "Using $EXPANDED_BAZEL_CACHE_PATH as Bazel's cache path"
          echo "build --disk_cache=$EXPANDED_BAZEL_CACHE_PATH" >> $HOME/.bazelrc
        shell: bash

      - name: Regex Patterns Validation Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          bazel run //scripts:regex_pattern_validation_check -- $(pwd)

      - name: XML Syntax Validation Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          bazel run //scripts:xml_syntax_check -- $(pwd)

      - name: Testfile Presence Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          bazel run //scripts:test_file_check -- $(pwd)

      - name: Accessibility label Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          bazel run //scripts:accessibility_label_check -- $(pwd) scripts/assets/accessibility_label_exemptions.pb app/src/main/AndroidManifest.xml

      - name: KDoc Validation Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          bazel run //scripts:kdoc_validity_check -- $(pwd) scripts/assets/kdoc_validity_exemptions.pb

      - name: Todo Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: |
          bazel run //scripts:todo_open_check -- $(pwd) scripts/assets/todo_open_exemptions.pb

      - name: String Resource Validation Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          bazel run //scripts:string_resource_validation_check -- $(pwd)

      - name: Binary files check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          bash /home/runner/work/oppia-android/oppia-android/scripts/pre-commit.sh
          echo "No binary files found in commit"
          echo "BINARY FILES CHECK PASSED"

  # Note that caching is intentionally not enabled for this check since licenses should always be
  # verified without any potential influence from earlier builds (i.e. always from a clean build to
  # ensure the results exactly match the current state of the repository).
  third_party_dependencies_check:
    name: Maven Dependencies Checks
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v2

      - name: Set up Bazel
        uses: abhinavsingh/setup-bazel@v3
        with:
          version: 6.5.0

      - name: Maven Repin Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          REPIN=1 bazel run @unpinned_maven//:pin

      - name: Maven Dependencies Update Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          bazel run //scripts:maven_dependencies_list_check -- $(pwd) third_party/maven_install.json scripts/assets/maven_dependencies.pb

      - name: License Texts Check
        # The expression if: ${{ !cancelled() }} runs a job or step regardless of its success or failure while responding to cancellations,
        # serving as a cancellation-compliant alternative to if: ${{ always() }} in concurrent workflows.
        if: ${{ !cancelled() }}
        run: |
          bazel run //scripts:license_texts_check -- $(pwd)/app/src/main/res/values/third_party_dependencies.xml