helm-diff-ci.yml

---
name: Helm Loki Diff CI
on:
  pull_request:
    paths:
      - "production/helm/loki/**"

# These permissions are needed to assume roles from Github's OIDC.
permissions:
  contents: read
  pull-requests: write

jobs:
  helm-diff:
    name: ${{ matrix.scenario.name }}
    runs-on: ubuntu-latest
    timeout-minutes: 10
    strategy:
      matrix:
        scenario:
          - name: Single Binary Scenario
            values_file: default-single-binary-values.yaml
            use_k3d: true
          - name: Default Values Scenario
            values_file: default-values.yaml
            use_k3d: true
          - name: Ingress Values Scenario
            values_file: ingress-values.yaml
            use_k3d: true
          - name: Legacy Monitoring Values Scenario
            values_file: legacy-monitoring-values.yaml
            use_k3d: true
          - name: Simple Scalable AWS Kube IRSA Values Scenario
            values_file: simple-scalable-aws-kube-irsa-values.yaml
            use_k3d: false
          - name: Simple Thanos Values Scenario
            values_file: simple-thanos-values.yaml
            use_k3d: false

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Helm
        uses: azure/setup-helm@v4

      - name: Add required Helm repositories
        run: |
          helm repo add minio https://charts.min.io/
          helm repo add grafana https://grafana.github.io/helm-charts
          helm repo add grafana-operator https://grafana.github.io/helm-charts
          helm repo update

      - name: Setup K3D
        if: ${{ matrix.scenario.use_k3d }}
        uses: ./.github/actions/setup-k3d

      - name: Setup Helm plugins
        if: ${{ matrix.scenario.use_k3d }}
        run: |
          helm plugin install https://github.com/databus23/helm-diff

      - name: Build helm dependencies
        run: |
          helm dependency build production/helm/loki

      # Conditional steps based on whether K3D is used
      - name: Run diff with K3D
        if: ${{ matrix.scenario.use_k3d }}
        env:
          HELM_DIFF_USE_UPGRADE_DRY_RUN: true
        run: |
          helm install --create-namespace loki-release grafana/loki -f production/helm/loki/scenarios/${{ matrix.scenario.values_file }}
          helm diff upgrade loki-release -f production/helm/loki/scenarios/${{ matrix.scenario.values_file }} production/helm/loki | tee helm_diff_output.txt

      - name: Run diff without K3D
        if: ${{ !matrix.scenario.use_k3d }}
        run: |
          helm template loki-release grafana/loki -f production/helm/loki/scenarios/${{ matrix.scenario.values_file }} > release-manifest.yaml
          helm template loki-release production/helm/loki -f production/helm/loki/scenarios/${{ matrix.scenario.values_file }} > current-manifest.yaml
          diff current-manifest.yaml release-manifest.yaml > helm_diff_output.txt || true

      - name: Convert Helm Diff Output to Markdown
        id: convert_diff
        run: |
          cat helm_diff_output.txt >> formatted_diff_output.md

      - name: Upload diff output as artifact
        uses: actions/upload-artifact@v4
        id: upload_diff
        with:
          name: ${{ matrix.scenario.name }}-diff-output
          path: formatted_diff_output.md
          retention-days: 2

  summary-diff-outputs:
    name: Summary Diffs
    runs-on: ubuntu-latest
    if: github.event.pull_request.head.repo.fork == false
    needs: [helm-diff]
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          persist-credentials: false

      - uses: actions/download-artifact@v4

      - name: Combine diff outputs
        run: |
          echo "## Helm Diff Output - Summary" > formatted_diff_output.md

          for scenario in */formatted_diff_output.md; do
            scenario_name=$(dirname "$scenario")

            echo "<details>" >> formatted_diff_output.md
            echo "" >> formatted_diff_output.md
            echo "<summary>${scenario_name}</summary>" >> formatted_diff_output.md
            echo "" >> formatted_diff_output.md
            echo '```diff' >> formatted_diff_output.md
            cat "$scenario" >> formatted_diff_output.md
            echo '```' >> formatted_diff_output.md
            echo "</details>" >> formatted_diff_output.md
            echo "" >> formatted_diff_output.md
          done

      - name: Post diff as PR comment
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          header: "Helm Diff Output - Summary"
          skip_unchanged: true
          hide_and_recreate: true
          append: true
          hide_classify: "OUTDATED"
          path: formatted_diff_output.md