container-build.yml

name: Reusable Container Build

on:
  workflow_call:
    inputs:
      build-version:
        description: "Version of Logprep to build"
        required: true
        type: string
      tags:
        description: "Tags to apply to the image"
        required: true
        type: string

jobs:
  containerbuild:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: [ "3.10", "3.11", "3.12" ]

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Generate Image Tags
        id: image-tag
        run: |
          python - <<EOF
          import os
          image = "ghcr.io/fkie-cad/logprep"
          version = "${{ matrix.python-version }}"
          tags = "${{ inputs.tags }}".split(",")
          full_image = [f"{image}:py{version}-{tag.strip()}" for tag in tags]
          with open(os.environ['GITHUB_OUTPUT'], 'a') as file:
              file.write(f"tags={', '.join(full_image)}")
          EOF

      - name: Build image and export to Docker
        uses: docker/build-push-action@v6
        id: build
        with:
          context: .
          load: true
          build-args: |
            LOGPREP_VERSION=${{ inputs.build-version }}
            PYTHON_VERSION=${{ matrix.python-version }}
          tags: ${{ steps.image-tag.outputs.tags }}

      - name: Extract image ID from sha256
        id: imageid
        run: |
          python - <<EOF
          import os
          digest = "${{ steps.build.outputs.ImageID }}"
          with open(os.environ['GITHUB_OUTPUT'], 'a') as file:
              file.write(f"imageid={digest.split(':')[1]}")
          EOF

      - name: Ensure logprep is available in image
        run: |
          docker run --rm ${{ steps.imageid.outputs.imageid }} --version

      - name: Push image
        uses: docker/build-push-action@v6
        id: build-and-push
        with:
          context: .
          push: true
          build-args: |
            LOGPREP_VERSION=${{ inputs.build-version }}
            PYTHON_VERSION=${{ matrix.python-version }}
          tags: ${{ steps.image-tag.outputs.tags }}

      - name: Install Cosign
        uses: sigstore/cosign-installer@v3.7.0
        with:
          cosign-release: 'v2.4.1'

      - name: Create SBOM of container image
        uses: anchore/sbom-action@v0
        with:
          image: ghcr.io/fkie-cad/logprep@${{ steps.build-and-push.outputs.digest }}
          artifact-name: logprep@${{ steps.imageid.outputs.imageid }}.spdx.json
          output-file: logprep@${{ steps.imageid.outputs.imageid }}.spdx.json

      - name: Sign image with a key and add sbom attestation
        run: |
          cosign sign --yes --key env://COSIGN_PRIVATE_KEY ghcr.io/fkie-cad/logprep@${{ steps.build-and-push.outputs.digest }}
          cosign attest --yes --key env://COSIGN_PRIVATE_KEY --predicate logprep@${{ steps.imageid.outputs.imageid }}.spdx.json ghcr.io/fkie-cad/logprep@${{ steps.build-and-push.outputs.digest }}
        env:
          COSIGN_PRIVATE_KEY: ${{ secrets.COSIGN_PRIVATE_KEY }}
          COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}

      # To avoid the trivy-db becoming outdated, we save the cache for one day
      - name: Get date
        id: date
        run: echo "date=$(date +%Y-%m-%d)" >> $GITHUB_OUTPUT

      - name: Restore trivy cache
        uses: actions/cache@v4
        with:
          path: cache/db
          key: trivy-cache-${{ steps.date.outputs.date }}
          restore-keys:
            trivy-cache-

      - name: Scan image using Trivy
        uses: aquasecurity/trivy-action@0.24.0
        env:
          TRIVY_CACHE_DIR: ./cache
        with:
          scan-type: image
          image-ref: ghcr.io/fkie-cad/logprep@${{ steps.build-and-push.outputs.digest }}
          trivy-config: trivy.yaml

      # Trivy-db uses `0600` permissions.
      # But `action/cache` use `runner` user by default
      # So we need to change the permissions before caching the database.
      - name: Change permissions for trivy.db
        run: sudo chmod 0644 ./cache/db/trivy.db