cicd.yaml

name: cicd

on:
  pull_request:
    branches:
      - main
  push:
    branches:
      - main
    tags:
      - 'v[0-9]+.[0-9]+.[0-9]+'

jobs:
  docker-build-and-push-images:
    runs-on: ubuntu-latest

    permissions:
      contents: read
      packages: write

    strategy:
      matrix:
        include:
          - host_namespace: ghcr.io/everest/everest-demo
            image_name: mqtt-server
            context: ./mosquitto
          - host_namespace: ghcr.io/everest/everest-demo
            image_name: nodered
            context: ./nodered
          - host_namespace: ghcr.io/everest/everest-demo
            image_name: manager
            context: ./manager

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

      - name: Ensure Docker image version is not referencing an existing release
        id: docker-image-version-check
        shell: bash
        run: |
          if ! [[ -s '.env'  ]]; then
            echo 'Error: No .env file found.'
            exit 1
          fi

          if ! grep -qE '^TAG=' .env; then
            echo 'Error: .env must contain a TAG variable.'
            exit 1
          fi

          source .env

          # Fail if any previous Docker image version value matches the one in
          # this PR (excluding the current image version).
          for commit in $(git --no-pager log --first-parent --format=%H -- .env | tail -n +2); do
            if git --no-pager grep -hF "${TAG}" $commit -- .env | grep -qx ${TAG}; then
              echo 'Error: The version in .env matches an'
              echo '       earlier version on main. Please update the value in'
              echo '       .env to a new version.'
              exit 1
            fi
          done

          if git show-ref --tags --verify --quiet "refs/tags/v${TAG}"; then
            echo "Error: The tag 'v${TAG}' is already a GitHub release."
            echo '       Please update the version in .env'
            exit 1
          else
            echo "TAG=${TAG}" >> "${GITHUB_OUTPUT}"
          fi

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Set Docker image metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ matrix.host_namespace }}/${{ matrix.image_name }}
          tags: |
            type=semver,pattern={{version}},value=v${{ steps.docker-image-version-check.outputs.TAG }}

      - name: Log into GitHub container registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
    
      - name: Build and export to Docker
        uses: docker/build-push-action@v6
        with:
          load: true
          context: ${{ matrix.context }}
          push: false
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha,scope=${{ matrix.image_name }}
          cache-to: type=gha,mode=max,scope=${{ matrix.image_name }}

      # Following fours steps are specifically for running automated steps which includes loading the 
      # mqtt-server image from the GitHub Actions Cache so that the docker compose automated tests can 
      # use this already built image instead of pulling it from GitHub Container Registry
      - name: Save Docker image
        if: ${{ matrix.image_name == 'mqtt-server' }}
        id: save-mqtt-image
        shell: bash
        run: |
          echo "TAG=${{ steps.docker-image-version-check.outputs.TAG }}"
          docker save --output /tmp/mqtt-server_${{ steps.docker-image-version-check.outputs.TAG }}.tar ghcr.io/everest/everest-demo/mqtt-server:${{ steps.docker-image-version-check.outputs.TAG }}
      
      - name: Upload mqtt-server image as Artifact
        if: ${{ matrix.image_name == 'mqtt-server' }}
        uses: actions/upload-artifact@v4
        with:
          name: mqtt_server_image_${{ steps.docker-image-version-check.outputs.TAG }}
          path: /tmp/mqtt-server_${{ steps.docker-image-version-check.outputs.TAG }}.tar
          overwrite: true

      - name: Download mqtt-server image as Artifact
        if: ${{ matrix.image_name == 'manager' }}
        uses: actions/download-artifact@v4
        with:
          name: mqtt_server_image_${{ steps.docker-image-version-check.outputs.TAG }}
          path: /tmp

      - name: Load Docker image
        if: ${{ matrix.image_name == 'manager' }}
        id: load-mqtt-image
        shell: bash
        run: |
          docker load --input /tmp/mqtt-server_${{ steps.docker-image-version-check.outputs.TAG }}.tar     
    
      - name: Run automated tests using docker-compose.automated-tests.yml
        if: ${{ matrix.image_name == 'manager' }}
        run: |
          docker images
          echo "Running docker compose up..."
          docker compose --project-name everest-ac-demo \
                  --file "docker-compose.automated-tests.yml" up \
                    --abort-on-container-exit \
                    --exit-code-from manager

          exit_code=$?            
          echo "Docker-compose up exit code from manager service: $exit_code"
      
      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: ${{ matrix.context }}
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha,scope=${{ matrix.image_name }}
          cache-to: type=gha,mode=max,scope=${{ matrix.image_name }}