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 }}
      ghcr_image: ${{ steps.var.outputs.ghcr_image }}
      docker_image: ${{ steps.var.outputs.docker_image }}
      glhr_image: ${{ steps.var.outputs.glhr_image }}

    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
    # only build if we can push to at least one registry
    if: needs.define-variables.outputs.images != ''
    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 (labels, annotations) 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: ${{ steps.rust-cache.outputs.cache-hit }}
      # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
      # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
      # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
      # It will not push images generated from a pull request
      - name: Set short git commit SHA
        id: sha
        run: |
          calculatedSha=$(git rev-parse --short ${{ github.sha }})
          echo "COMMIT_SHORT_SHA=$calculatedSha" >> $GITHUB_ENV
      - name: Build and push Docker image by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          file: "Containerfile"
          build-args: |
            ${{ matrix.target_cpu != 'base' && format('TARGET_CPU={0}', matrix.target_cpu) || '' }}
            CONDUWUIT_VERSION_EXTRA=${{ env.COMMIT_SHORT_SHA }}
          platforms: ${{ matrix.platform }}
          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

      # This step generates an artifact attestation for the image, which is an unforgeable statement about where and how it was built. It increases supply chain security for people who consume the image. For more information, see "[Using artifact attestations to establish provenance for builds](https://docs.github.com/en/actions/security-for-github-actions/using-artifact-attestations/using-artifact-attestations-to-establish-provenance-for-builds)." 
      - name: Generate artifact attestation (${{ needs.define-variables.outputs.ghcr_image}})
        uses: actions/attest-build-provenance@v2
        if: env.GHCR_ENABLED == 'true'
        with:
          subject-name: ${{ needs.define-variables.outputs.ghcr_image}}
          subject-digest: ${{ steps.build.outputs.digest }}
          push-to-registry: true
      - name: Generate artifact attestation (index.${{ needs.define-variables.outputs.docker_image}})
        uses: actions/attest-build-provenance@v2
        if: (vars.DOCKER_USERNAME != '') && (env.DOCKERHUB_TOKEN != '')
        with:
          # see action readme (we need to use index.docker.io rather than docker.io)
          subject-name: index.${{ needs.define-variables.outputs.docker_image}}
          subject-digest: ${{ steps.build.outputs.digest }}
          push-to-registry: true
      - name: Generate artifact attestation (${{ needs.define-variables.outputs.glhr_image}})
        uses: actions/attest-build-provenance@v2
        if: (vars.GITLAB_USERNAME != '') && (env.GITLAB_TOKEN != '')
        with:
          subject-name: ${{ needs.define-variables.outputs.glhr_image}}
          subject-digest: ${{ steps.build.outputs.digest }}
          push-to-registry: 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) 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
            type=sha,format=long,prefix={{branch}}-
          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         

      - name: Create manifest list and push
        working-directory: /tmp/digests
        env:
          IMAGES: ${{needs.define-variables.outputs.images}}
        run: |
          IFS=$'\n'
          IMAGES_LIST=($IMAGES)
          ANNOTATIONS_LIST=($DOCKER_METADATA_OUTPUT_ANNOTATIONS)
          TAGS_LIST=($DOCKER_METADATA_OUTPUT_TAGS)
          for REPO in "${IMAGES_LIST[@]}"; do
              docker buildx imagetools create \
                $(for tag in "${TAGS_LIST[@]}"; do echo "--tag"; echo "$tag"; done) \
                $(for annotation in "${ANNOTATIONS_LIST[@]}"; do echo "--annotation"; echo "$annotation"; done) \
                $(for reference in *; do printf "$REPO@sha256:%s\n" $reference; done)
          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