name: docker

on:
  push:
    tags:
      - "v*"
  pull_request:
    branches:
      - "main"

env:
  platforms: "linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6"
  dhcr_repo: klutchell/unbound
  ghcr_repo: klutchell/unbound

jobs:
  meta:
    runs-on: ubuntu-20.04

    outputs:
      json: ${{ steps.meta.outputs.json }}
      tags: ${{ steps.meta.outputs.tags }}
      labels: ${{ steps.meta.outputs.labels }}
      version: ${{ steps.meta.outputs.version }}
      platforms: ${{ steps.array.outputs.build }}

    steps:
      - uses: actions/checkout@v2

      - id: meta
        uses: docker/metadata-action@v3
        with:
          images: docker.io/${{ env.dhcr_repo }},ghcr.io/${{ env.ghcr_repo }}
          tags: |
            type=ref,event=tag
            type=ref,event=branch
            type=ref,event=pr
            type=sha

      - id: array
        uses: kanga333/json-array-builder@v0.1.0
        with:
          str: ${{ env.platforms }}
          separator: ","

  build:
    runs-on: ubuntu-20.04
    needs: meta

    env:
      archive: "oci-image.tar"

    steps:
      - uses: actions/checkout@v2

      - uses: docker/setup-buildx-action@v1
        with:
          driver-opts: network=host

      - uses: docker/build-push-action@v2
        with:
          platforms: ${{ env.platforms }}
          labels: ${{ steps.meta.outputs.labels }}
          tags: ${{ needs.meta.outputs.tags }}
          cache-to: type=gha,mode=max
          cache-from: |
            type=gha
            ${{ steps.meta.outputs.tags }}
          outputs: type=oci,dest=${{ env.archive }}

      - uses: actions/upload-artifact@v2
        with:
          name: oci-archive
          path: ${{ env.archive }}
          retention-days: 1

  test:
    runs-on: ubuntu-20.04
    needs: [meta, build]

    strategy:
      matrix:
        tag: ${{ fromJson(needs.meta.outputs.json).tags }}
        platform: ${{ fromJson(needs.meta.outputs.platforms) }}

    env:
      archive: "oci-image.tar"

    steps:
      - uses: actions/download-artifact@v2
        with:
          name: oci-archive
          path: ./

      - id: ref
        run: echo "::set-output name=string::$(echo ${{ matrix.tag }} | awk -F ":" '{print $NF}')"

      - name: Load image
        run: |
          skopeo --debug \
            --override-os "$(echo ${{ matrix.platform }} | awk -F '/' '{print $1}')" \
            --override-arch "$(echo ${{ matrix.platform }} | awk -F '/' '{print $2}')" \
            --override-variant "$(echo ${{ matrix.platform }} | awk -F '/' '{print $3}')" \
            copy "oci-archive:${{ env.archive }}:${{ steps.ref.outputs.string }}" "docker-daemon:${{ env.ghcr_repo }}:${{ steps.ref.outputs.string }}"

      # QEMU is required for emulation
      - uses: docker/setup-qemu-action@v1

      # VERSION is required in project root
      - uses: actions/checkout@v2

      - name: Run tests
        run: |
          docker run -d --name sut ${{ env.ghcr_repo }}:${{ steps.ref.outputs.string }}
          docker exec sut unbound -V | tee /dev/stderr | grep -wq "$(head -n1 VERSION)" || { docker logs sut ; exit 1 ; }
          docker exec sut dig sigok.verteiltesysteme.net @127.0.0.1 +dnssec | tee /dev/stderr | grep -wq NOERROR || { docker logs sut ; exit 1 ; }
          docker exec sut dig sigfail.verteiltesysteme.net @127.0.0.1 +dnssec | tee /dev/stderr | grep -wq SERVFAIL || { docker logs sut ; exit 1 ; }
          docker logs sut
          docker rm -f sut

  deploy:
    runs-on: ubuntu-20.04
    needs: [meta, build, test]
    if: github.actor == github.repository_owner

    env:
      archive: "oci-image.tar"

    strategy:
      matrix:
        tag: ${{ fromJson(needs.meta.outputs.json).tags }}

    steps:
      - uses: actions/download-artifact@v2
        with:
          name: oci-archive
          path: ./

      - uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: docker/login-action@v1
        with:
          registry: docker.io
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - id: ref
        run: echo "::set-output name=string::$(echo ${{ matrix.tag }} | awk -F ":" '{print $NF}')"

      - name: Push manifest
        run: skopeo --debug copy --all --format v2s2 "oci-archive:${{ env.archive }}:${{ steps.ref.outputs.string }}" "docker://${{ matrix.tag }}"

  description:
    runs-on: ubuntu-20.04
    needs: [meta, deploy]
    if: github.actor == github.repository_owner

    steps:
      - uses: actions/checkout@v2

      - uses: peter-evans/dockerhub-description@v2
        if: ${{ contains(needs.meta.outputs.tags, ':latest') }}
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_PASSWORD }}
          repository: ${{ env.dhcr_repo }}