# Based on: https://github.com/docker/build-push-action/blob/master/docs/advanced/test-before-push.md
# Trigger and tag naming rules are based on the settings we were previously using at Docker Hub.

name: Packaging Docker
on:
  push:
    branches:
      - main
    tags:
      - 'v[0-9]+.[0-9]+.[0-9]+'
      - 'v[0-9]+.[0-9]+.[0-9]+-rc[0-9]+'

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Extract metadata for tagging the Docker image
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: nlnetlabs/routinator
          flavor: |
            latest=false
          tags: |
            type=semver,pattern={{raw}}
            type=raw,value=unstable,enable=${{ github.ref == 'refs/heads/main' }}
            type=raw,value=latest,enable=${{ github.ref != 'refs/heads/main' && !contains(github.ref, '-') }}

      - name: Log into Docker Hub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_HUB_ID }}
          password: ${{ secrets.DOCKER_HUB_TOKEN }}

      # Build the image and tag it with a test tag we can use in the subsequent step when we invoke 'docker run'.
      - name: Build Docker image
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: linux/amd64
          push: false
          load: true
          tags: nlnetlabs/routinator:sanitycheck

      # Do a basic sanity check of the created image using the test tag to select the image to run.
      - name: Sanity check
        run: |
          docker run --rm nlnetlabs/routinator:sanitycheck --version

      # Push the image and tags to Docker Hub.
      # The build uses the cached build outputs from the step above so we don't have to wait for the build again.
      #
      # On push of a tag to refs/tags/v1.2.3 the Docker tags will be 'v1.2.3' and 'latest' because of:
      #   type=semver,pattern={{raw}}
      #   type=raw,value=latest,enable=${{ github.ref != 'refs/heads/main' && !contains(github.ref, '-') }}
      #                                    ^^^^^^^^^^^^^ true, not main       ^^^^^^^^^ true, no dash found
      #
      # On push of a tag to refs/tags/v1.2.3-rc1 the Docker tags will be 'v1.2.3' but NOT 'latest' because of:
      #   type=semver,pattern={{raw}}
      #   type=raw,value=latest,enable=${{ github.ref != 'refs/heads/main' && !contains(github.ref, '-') }}
      #                                    ^^^^^^^^^^^^^ true, not main       ^^^^^^^^^ false, dash found
      #
      # On push to refs/heads/main the Docker tag will be 'unstable' because of:
      #   type=raw,value=unstable,enable=${{ github.ref == 'refs/heads/main' }}
      - name: Push built Docker image to Docker Hub
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: linux/amd64
          push: true
          tags: ${{ steps.meta.outputs.tags }}