name: Release Docker Image

on:
  pull_request:
  push:
    paths-ignore:
      - '.gitlab-ci.yml'
      - '.gitignore'
      - 'renovate.json'
      - 'debian/**'
      - 'docker/**'
    branches:
      - main
    tags:
      - '*'
  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:
env:
  DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
  GITLAB_TOKEN: ${{ secrets.GITLAB_TOKEN }}
  GHCR_ENABLED: "${{ (github.event_name != 'pull_request' || github.event.pull_request.head.repo.fork == false) && 'true' || 'false' }}"
jobs:

  define-variables:
    runs-on: ubuntu-latest

    outputs:
      images: ${{ steps.var.outputs.images }}
      images_list: ${{ steps.var.outputs.images_list }}
      build_matrix: ${{ steps.var.outputs.build_matrix }}
      merge_matrix: ${{ steps.var.outputs.merge_matrix }}

    steps:
      - name: Setting variables
        uses: actions/github-script@v7
        id: var
        with:
          script: |
            const githubRepo = '${{ github.repository }}'.toLowerCase()
            const repoId = githubRepo.split('/')[1]
            
            core.setOutput('github_repository', githubRepo)
            const ghcrImage = 'ghcr.io/' + githubRepo
            const glhrImage = 'registry.gitlab.com/' + '${{ vars.GITLAB_USERNAME }}'.toLowerCase() + '/' + repoId
            const dockerImage = 'docker.io/' + '${{ vars.DOCKER_USERNAME }}'.toLowerCase() + '/' + repoId
            core.setOutput('ghcr_image', ghcrImage)
            core.setOutput('docker_image', dockerImage)
            core.setOutput('glhr_image', glhrImage)
            let images = []
            if (process.env.GHCR_ENABLED === "true") {
              images.push(ghcrImage)
            }
            if (process.env.DOCKERHUB_TOKEN) {
              images.push(dockerImage)
            }
            if (process.env.GITLAB_TOKEN) {
              images.push(glhrImage)
            }
            core.setOutput('images', images.join("\n"))
            core.setOutput('images_list', images.join(","))
            const platforms = ['linux/amd64', 'linux/arm64']
            // specific CPU build variations
            const includes = [
              {
                platform: 'linux/amd64',
                target_cpu: 'haswell',
                tag_suffix: '-haswell'
              }
            ]
            // Image builds
            core.setOutput('build_matrix', JSON.stringify({
              platform: platforms,
              target_cpu: ['base'],
              include: includes
            }))
            // image publishes
            core.setOutput('merge_matrix', JSON.stringify({
              tag_suffix: ['', ...includes.map((i) => i.tag_suffix).filter((i) => typeof i == 'string')]
            }))
  build-image:
    runs-on: ubuntu-latest
    
    needs: define-variables
    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
    permissions:
      contents: read
      packages: write
      attestations: write
      id-token: write
    strategy:
      matrix: ${{ fromJSON(needs.define-variables.outputs.build_matrix) }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          persist-credentials: false
      
      # For publishing multi-platform manifests
      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
            registry: ghcr.io
            username: ${{ github.actor }}
            password: ${{ secrets.GITHUB_TOKEN }}

      - name: Login to Docker Hub
        if: ${{ (vars.DOCKER_USERNAME != '') && (env.DOCKERHUB_TOKEN != '') }}
        uses: docker/login-action@v3
        with:
            registry: docker.io
            username: ${{ vars.DOCKER_USERNAME }}
            password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Login to GitLab Container Registry
        if: ${{ (vars.GITLAB_USERNAME != '') && (env.GITLAB_TOKEN != '') }}
        uses: docker/login-action@v3
        with:
            registry: registry.gitlab.com
            username: ${{ vars.GITLAB_USERNAME }}
            password: ${{ secrets.GITLAB_TOKEN }}

      # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{needs.define-variables.outputs.images}}
          # default labels & annotations: https://github.com/docker/metadata-action/blob/master/src/meta.ts#L509
        env:
          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index

      # These steps work around docker mount caches not being cached between runs in CI providers.
      # It manually injects the mounts into Docker.
      # We use 
      - uses: Swatinem/rust-cache@v2
        with:
          prefix-key: v0-rust-${{matrix.platform}}-${{matrix.target_cpu}}
        id: rust-cache

      - name: Inject cache into Docker
        uses: reproducible-containers/buildkit-cache-dance@v3.1.2
        with:
          cache-map: |
            {
              "/home/runner/.cargo/registry": "/usr/local/cargo/registry",
              "/home/runner/.cargo/git/db": "/usr/local/cargo/git/db",
              "./target": "/app/target"
            }
          # skip-extraction: ${{ steps.rust-cache.outputs.cache-hit }}
      # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
      # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
      # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
      # It will not push images generated from a pull request
      - name: Build and push Docker image by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          file: "Containerfile"
          build-args: ${{ matrix.target_cpu != 'base' && format('TARGET_CPU={0}', matrix.target_cpu) || '' }}
          platforms: ${{ matrix.platform }}
          push: ${{ github.event_name != 'pull_request' }}
          labels: ${{ steps.meta.outputs.labels }}
          annotations: ${{ steps.meta.outputs.annotations }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          sbom: true
          outputs: type=image,"name=${{ needs.define-variables.outputs.images_list }}",push-by-digest=true,name-canonical=true,push=true

      # For publishing multi-platform manifests
      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"          

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: ${{matrix.tag_suffix || ''}}digests-${{ env.PLATFORM_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1
  
  merge:
    runs-on: ubuntu-latest
    needs: [define-variables, build-image]
    strategy:
      matrix: ${{ fromJSON(needs.define-variables.outputs.merge_matrix) }}
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: ${{matrix.tag_suffix || ''}}digests-*
          merge-multiple: true
      # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
            registry: ghcr.io
            username: ${{ github.actor }}
            password: ${{ secrets.GITHUB_TOKEN }}

      - name: Login to Docker Hub
        if: ${{ (vars.DOCKER_USERNAME != '') && (env.DOCKERHUB_TOKEN != '') }}
        uses: docker/login-action@v3
        with:
            registry: docker.io
            username: ${{ vars.DOCKER_USERNAME }}
            password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Login to GitLab Container Registry
        if: ${{ (vars.GITLAB_USERNAME != '') && (env.GITLAB_TOKEN != '') }}
        uses: docker/login-action@v3
        with:
            registry: registry.gitlab.com
            username: ${{ vars.GITLAB_USERNAME }}
            password: ${{ secrets.GITLAB_TOKEN }}

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

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          flavor: |
            suffix=-tiny${{ matrix.tag_suffix }}
          tags: |
            type=semver,pattern=v{{version}}
            type=semver,pattern=v{{major}}.{{minor}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.0.') }}
            type=semver,pattern=v{{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
            type=ref,event=branch
            type=ref,event=pr
          images: ${{needs.define-variables.outputs.images}}
          # default labels & annotations: https://github.com/docker/metadata-action/blob/master/src/meta.ts#L509
        env:
          DOCKER_METADATA_ANNOTATIONS_LEVELS: index,manifest         

      - name: Create manifest list and push
        working-directory: /tmp/digests
        env:
          IMAGES: ${{needs.define-variables.outputs.images}}
        run: |
          IMAGES_LIST=($IMAGES)
          for REPO in "${IMAGES_LIST[@]}"; do
            docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \ 
              $(printf -- "--annotation \"%s\" " "${DOCKER_METADATA_OUTPUT_ANNOTATIONS[@]}") \
              $(printf "$REPO@sha256:%s " *)
          done

      - name: Inspect image
        env:
          IMAGES: ${{needs.define-variables.outputs.images}}
        run: |
          IMAGES_LIST=($IMAGES)
          for REPO in "${IMAGES_LIST[@]}"; do
            docker buildx imagetools inspect $REPO:${{ steps.meta.outputs.version }}
          done