trivy-pr-comment.yml

name: PR Vulnerability Scan
on: pull_request_target

permissions:
  pull-requests: write
  issues: write

jobs:
  trivy:
    name: Trivy Scan
    runs-on: ubuntu-20.04
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Build Loki Image
        run: |
          IMAGE_TAG="$(./tools/image-tag)"
          make loki-image
          echo "IMAGE_TAG=${IMAGE_TAG}" >> $GITHUB_ENV

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: "docker.io/grafana/loki:${{ env.IMAGE_TAG }}"
          format: "json"
          output: "trivy.json"
          severity: "CRITICAL,HIGH"

      - name: Prepare Trivy Message
        run: |
          echo "Trivy scan found the following vulnerabilities:" > trivy.txt

      - name: Format Trivy Message
        uses: sergeysova/jq-action@v2
        continue-on-error: true
        with:
          cmd: jq -r '.Results[] | select(.Vulnerabilities != null) | .Vulnerabilities[] | "* **\(.Severity)** [\(.Title)](\(.PrimaryURL)) in `\(.PkgName)` v\(.InstalledVersion). Fixed in v\(.FixedVersion)"' trivy.json >> trivy.txt

      - name: Determine whether to comment
        continue-on-error: true
        id: should-comment
        run: |
          if [[ $(wc -l < trivy.txt) -gt 1 ]]; then exit 0; fi
          exit 1

      - name: Comment on PR with Trivy scan results
        uses: mshick/add-pr-comment@v2
        if: ${{ steps.should-comment.outcome == 'success' }}
        with:
          message-id: trivy-${{ github.event.number }}
          message-path: trivy.txt