name: docker-build

on:
  # pipeline runs per trigger condition, so release trigger not required as tag is sufficient
  #release:
  #  types: [published]
  push:
    branches:
      - 'main'
      - 'feature/config-overhaul'
    tags:
      - 'v*'
  pull_request:
    branches:
      - 'main'
      - 'feature/config-overhaul'

env:
  DOCKERHUB_REPO: akkudoktor/eos
  GHCR_REPO: ghcr.io/akkudoktor-eos/eos
  EOS_LICENSE: Apache-2.0

# From https://docs.docker.com/build/ci/github-actions/multi-platform/
# Changes:
#  - adjusted rw permissions
#  - manually set undetected license (label+annotation)
#  - set description for index manifest
#  - add attestation
#  - conditionally don't push on pr
#  - on pr just use amd64 platform
jobs:
  # Build platform matrix excludes. if-conditional with matrix on job level is not
  # supported, see https://github.com/actions/runner/issues/1985
  platform-excludes:
    runs-on: ubuntu-latest
    outputs:
      excludes: ${{ steps.excludes.outputs.matrix }}
    steps:
      - id: excludes
        run: |
          if ${{ github.event_name == 'pull_request' }}; then
            echo 'matrix=[
              {"platform": "linux/arm64"}
            ]' | tr -d '[:space:]' >> $GITHUB_OUTPUT
          else
            echo 'matrix=[]' >> $GITHUB_OUTPUT
          fi

  build:
    needs: platform-excludes
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      attestations: write
      id-token: write
    strategy:
      fail-fast: false
      matrix:
        platform:
          - linux/amd64
          - linux/arm64
        exclude: ${{ fromJSON(needs.platform-excludes.outputs.excludes) }}
    steps:
      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.DOCKERHUB_REPO }}
            ${{ env.GHCR_REPO }}
          labels: |
            org.opencontainers.image.licenses=${{ env.EOS_LICENSE }}
          annotations: |
            org.opencontainers.image.licenses=${{ env.EOS_LICENSE }}
        env:
          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index

      # Prepare to extract description so it can be manually set for index manifest (group of platform manifests)
      - name: Prepare description
        id: get_description
        run: |
          echo "EOS_REPO_DESCRIPTION=$(jq -cr '.labels."org.opencontainers.image.description"' <<< "$DOCKER_METADATA_OUTPUT_JSON")" >> $GITHUB_ENV

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        # skip for pull requests
        if: ${{ github.event_name != 'pull_request' }}
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_PASSWORD }}

      - name: Login to GHCR
        uses: docker/login-action@v3
        # skip for pull requests
        if: ${{ github.event_name != 'pull_request' }}
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
        # skip for pull requests
        if: ${{ github.event_name != 'pull_request' }}

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

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          platforms: ${{ matrix.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          annotations: ${{ steps.meta.outputs.annotations }}
          outputs: type=image,"name=${{ env.DOCKERHUB_REPO }},${{ env.GHCR_REPO }}",push-by-digest=true,name-canonical=true,"push=${{ github.event_name != 'pull_request' }}","annotation-index.org.opencontainers.image.description=${{ env.EOS_REPO_DESCRIPTION }}"

      - name: Generate artifact attestation DockerHub
        uses: actions/attest-build-provenance@v2
        if: ${{ github.event_name != 'pull_request' }}
        with:
          subject-name: docker.io/${{ env.DOCKERHUB_REPO }}
          subject-digest: ${{ steps.build.outputs.digest }}
          push-to-registry: true

      - name: Generate artifact attestation GitHub
        uses: actions/attest-build-provenance@v2
        if: ${{ github.event_name != 'pull_request' }}
        with:
          subject-name: ${{ env.GHCR_REPO }}
          subject-digest: ${{ steps.build.outputs.digest }}
          push-to-registry: true

      - 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: digests-${{ env.PLATFORM_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write
    needs:
      - build
    # skip for pull requests
    if: ${{ github.event_name != 'pull_request' }}
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_PASSWORD }}

      - name: Login to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

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

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.DOCKERHUB_REPO }}
            ${{ env.GHCR_REPO }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
          labels: |
            org.opencontainers.image.licenses=${{ env.EOS_LICENSE }}
          annotations: |
            org.opencontainers.image.licenses=${{ env.EOS_LICENSE }}
        env:
          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.DOCKERHUB_REPO }}@sha256:%s ' *)
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.GHCR_REPO }}@sha256:%s ' *)

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.DOCKERHUB_REPO }}:${{ steps.meta.outputs.version }}
          docker buildx imagetools inspect ${{ env.GHCR_REPO }}:${{ steps.meta.outputs.version }}