name: Docker Build
on: [push]

jobs:
  docker-build:
    runs-on: ubuntu-latest
    services:
      registry:
        image: registry:2
        ports:
          - '5000:5000'
    env:
      DOCKER_BUILDKIT: 1
      DOCKER_CLI_EXPERIMENTAL: enabled
    steps:
    - name: enable experimental mode
      run: |
        mkdir -p ~/.docker
        echo '{"experimental": "enabled"}' > ~/.docker/config.json
    - name: Set up QEMU
      uses: docker/setup-qemu-action@v1.2.0
    - name: Set up Docker Buildx
      id: buildx
      uses: docker/setup-buildx-action@v1.6.0
      with:
        version: v0.5.1
        driver-opts: |
          image=moby/buildkit:buildx-stable-1
          network=host
    - name: Available platforms
      run: echo {{ `${{ steps.buildx.outputs.platforms }}` }}
    - run: docker info && docker version
    - uses: actions/checkout@v2
      with:
        fetch-depth: 0
    - name: determine if this is a tag
      run: |
        if (git describe --abbrev=0 --exact-match &>/dev/null); then
          tag=$(git describe --abbrev=0 --exact-match)
          echo "is_tag=true" >> $GITHUB_ENV
          echo "git_tag=$tag" >> $GITHUB_ENV
          # splits the major version from $tag - assumes it's a 3-part semver
          echo "major_version=${tag%%\.*}" >> $GITHUB_ENV
        fi
        echo $GITHUB_ENV
      if: github.repository == 'hairyhenderson/gomplate'
    - name: Build & Push (non-master)
      run: |
        set -ex
        make docker-multi COMMIT=${{ github.sha }} DOCKER_REPO=localhost:5000/gomplate BUILDX_ACTION=--push

        docker buildx imagetools create --dry-run -t localhost:5000/gomplate:dev localhost:5000/gomplate:latest
        docker buildx imagetools create --dry-run -t localhost:5000/gomplate:dev-slim localhost:5000/gomplate:slim
        docker buildx imagetools create --dry-run -t localhost:5000/gomplate:dev-alpine localhost:5000/gomplate:alpine
      if: github.repository != 'hairyhenderson/gomplate' || (github.ref != 'refs/heads/master' && env.is_tag != 'true')
    - name: Login to GHCR
      uses: docker/login-action@v1.14.1
      with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      if: github.repository == 'hairyhenderson/gomplate' && (github.ref == 'refs/heads/master' || env.is_tag == 'true')
    - name: Login to DockerHub
      uses: docker/login-action@v1.14.1
      with:
          # NOTE: DOCKERHUB_TOKEN and DOCKERHUB_USERNAME must be present in https://github.com/hairyhenderson/gomplate/settings
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      if: github.repository == 'hairyhenderson/gomplate' && (github.ref == 'refs/heads/master' || env.is_tag == 'true')
    - name: Build & Push (master)
      run: |
        make docker-multi COMMIT=${{ github.sha }} DOCKER_REPO=hairyhenderson/gomplate BUILDX_ACTION=--push
        make docker-multi COMMIT=${{ github.sha }} DOCKER_REPO=ghcr.io/hairyhenderson/gomplate BUILDX_ACTION=--push
      if: github.repository == 'hairyhenderson/gomplate' && github.ref == 'refs/heads/master'
    - name: Build & Push (tagged release)
      run: |
        make docker-multi COMMIT=${{ github.sha }} DOCKER_REPO=hairyhenderson/gomplate BUILDX_ACTION=--push
        make docker-multi COMMIT=${{ github.sha }} DOCKER_REPO=ghcr.io/hairyhenderson/gomplate BUILDX_ACTION=--push

        set -x
        repo=hairyhenderson/gomplate
        docker buildx imagetools create -t ${repo}:stable ${repo}:latest
        docker buildx imagetools create -t ${repo}:${git_tag} ${repo}:latest
        docker buildx imagetools create -t ${repo}:${major_version} ${repo}:latest

        docker buildx imagetools create -t ${repo}:stable-slim ${repo}:slim
        docker buildx imagetools create -t ${repo}:${git_tag}-slim ${repo}:slim
        docker buildx imagetools create -t ${repo}:${major_version}-slim ${repo}:slim

        docker buildx imagetools create -t ${repo}:stable-alpine ${repo}:alpine
        docker buildx imagetools create -t ${repo}:${git_tag}-alpine ${repo}:alpine
        docker buildx imagetools create -t ${repo}:${major_version}-alpine ${repo}:alpine

        # and now GHCR
        repo=ghcr.io/hairyhenderson/gomplate
        docker buildx imagetools create -t ${repo}:stable ${repo}:latest
        docker buildx imagetools create -t ${repo}:${git_tag} ${repo}:latest
        docker buildx imagetools create -t ${repo}:${major_version} ${repo}:latest

        docker buildx imagetools create -t ${repo}:stable-slim ${repo}:slim
        docker buildx imagetools create -t ${repo}:${git_tag}-slim ${repo}:slim
        docker buildx imagetools create -t ${repo}:${major_version}-slim ${repo}:slim

        docker buildx imagetools create -t ${repo}:stable-alpine ${repo}:alpine
        docker buildx imagetools create -t ${repo}:${git_tag}-alpine ${repo}:alpine
        docker buildx imagetools create -t ${repo}:${major_version}-alpine ${repo}:alpine
      if: github.repository == 'hairyhenderson/gomplate' && env.is_tag == 'true'