unit-test.yml

---
name: Unit Test
# yamllint disable-line rule:truthy
on:
  push:
    branches: ["main"]
    paths:
      - 'charts/**'
      - '!charts/k8s-monitoring-v1/**'
  pull_request:
    paths:
      - 'charts/**'
      - '!charts/k8s-monitoring-v1/**'

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:


jobs:
  detect-changed-charts:
    name: Detect Changed Charts
    runs-on: ubuntu-latest
    outputs:
      changed_charts: ${{ steps.changed_charts.outputs.changed_charts }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Detect Changed Charts
        id: changed_charts
        run: |
          if [ "${{ github.event_name }}" == "pull_request" ]; then
            # In pull request, compare against the base branch (upstream)
            base_branch="${{ github.event.pull_request.base.ref }}"
            echo "Comparing against base branch: $base_branch"
            git fetch origin $base_branch
            base_commit="origin/$base_branch"
          elif [ "${{ github.event_name }}" == "push" ]; then
            # In push to main, compare the last commit with HEAD^
            base_commit="HEAD^"
          elif [ "${{ github.event_name }}" == "workflow_dispatch" ]; then
            # In manual trigger, run for all charts
            echo "Manual dispatch detected, running tests for all charts"
            # shellcheck disable=SC2010
            changed_charts=$(ls charts | grep -v "k8s-monitoring-v1" | sort -u)
            echo "changed_charts=$(echo "$changed_charts" | jq --raw-input --slurp --compact-output 'split("\n") | map(select(. != ""))')" >> "${GITHUB_OUTPUT}"
            exit 0
          fi

          # Check if base commit exists, fallback to empty tree if none
          if ! git rev-parse --verify "$base_commit" >/dev/null 2>&1; then
            base_commit=$(git hash-object -t tree /dev/null)
          fi

          # Detect modified files
          modified_charts=$(git diff --name-only "$base_commit" HEAD -- 'charts/*' | grep "^charts/" | cut -d "/" -f2 | sort -u)

          # Detect newly added files (untracked files)
          added_charts=$(git ls-files --others --exclude-standard -- 'charts/*' | grep "^charts/" | cut -d "/" -f2 | sort -u)

          # Combine both added and modified charts
          changed_charts=$(echo -e "$modified_charts\n$added_charts" | grep -v "k8s-monitoring-v1" | sort -u)

          if [ -z "$changed_charts" ]; then
            echo "No changes detected in charts"
          else
            echo "Changed charts: $changed_charts"
            echo "changed_charts=$(echo "$changed_charts" | jq --raw-input --slurp --compact-output 'split("\n") | map(select(. != ""))')" >> "${GITHUB_OUTPUT}"
          fi

  run-tests:
    name: Testing
    needs: detect-changed-charts
    runs-on: ubuntu-latest
    strategy:
      matrix:
        dir: ${{ fromJson(needs.detect-changed-charts.outputs.changed_charts) }}
      fail-fast: false
    if: ${{ needs.detect-changed-charts.outputs.changed_charts != 'none' }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up chart-testing
        uses: helm/chart-testing-action@v2

      # Installing Grafana Alloy because we need it to lint the generated alloy config files.
      # https://grafana.com/docs/alloy/latest/get-started/install/linux/
      - name: Install Grafana Alloy
        run: |
          sudo mkdir -p /etc/apt/keyrings/
          wget -q -O - https://apt.grafana.com/gpg.key | gpg --dearmor | sudo tee /etc/apt/keyrings/grafana.gpg > /dev/null
          echo "deb [signed-by=/etc/apt/keyrings/grafana.gpg] https://apt.grafana.com stable main" | sudo tee /etc/apt/sources.list.d/grafana.list
          sudo apt-get update
          sudo apt-get install -y alloy

      - name: Run tests
        run: make -C "charts/${{ matrix.dir }}" test

  check-generated-files:
    name: Check Generated Files
    needs: detect-changed-charts
    runs-on: ubuntu-latest
    strategy:
      matrix:
        dir: ${{ fromJson(needs.detect-changed-charts.outputs.changed_charts) }}
      fail-fast: false
    if: ${{ needs.detect-changed-charts.outputs.changed_charts != 'none' }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Regenerate files
        run: make -C "charts/${{ matrix.dir }}" clean build

      - name: Check for changes in generated files
        run: |
          cd charts/${{ matrix.dir }}
          if [ "${{ matrix.dir }}" == "k8s-monitoring" ]; then
            # Skip checking subchart files for k8s-monitoring, which are always modified, even if the contents are identical
            if ! git diff --exit-code -- ':!charts/*.tgz'; then
              echo "Generated files in charts/${{ matrix.dir }} are not up to date. Please run 'make all' and commit the changes."
              exit 1
            fi
          elif ! git diff --exit-code .; then
            echo "Generated files in charts/${{ matrix.dir }} are not up to date. Please run 'make all' and commit the changes."
            exit 1
          else
            echo "Generated files in charts/${{ matrix.dir }} are up to date."
          fi