docker.yml

name: Build docker image for subsequent jobs, resuing where possible.

on:
  workflow_call:
    inputs:
      dockerfile:
        description: 'Path to the dockerfile to be built'
        required: true
        type: string
      image_name:
        description: 'Name to give to the built docker image'
        required: true
        type: string
    outputs:
      image:
        value: ${{ jobs.build_docker.outputs.image }}

jobs:
  build_docker:
    name: Build docker image
    runs-on: ubuntu-latest
    outputs:
      image: ${{ steps.container_tag.outputs.tag }}
    steps:
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
      - name: Login to registry
        uses: docker/login-action@v2
        with:
          registry: ${{ vars.DOCKER_REGISTRY }}
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      - name: Clear more space
        # See https://github.com/actions/runner-images/issues/2840
        # - otherwise the runner runs out of space when building the tezos image
        shell: bash
        run: |
          sudo rm -rf /usr/share/dotnet
          sudo rm -rf /opt/ghc
          sudo rm -rf "/usr/local/share/boost"
          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
          sudo df -h

      - name: Checkout
        uses: actions/checkout@v3

      - name: Branches ref
        id: branches
        shell: bash
        run: |
          echo "source=$(echo ${{ github.head_ref }} | cut -c -63 | sed -E 's/[^a-z0-9-]+/-/g' | sed -E 's/^-*([a-z0-9-]+[a-z0-9])-*$$/\1/g')" >> $GITHUB_OUTPUT
          echo "target=$(echo ${GITHUB_BASE_REF} | cut -c -63 | sed -E 's/[^a-z0-9-]+/-/g' | sed -E 's/^-*([a-z0-9-]+[a-z0-9])-*$$/\1/g')" >> $GITHUB_OUTPUT
          echo "branch=$(echo ${{ github.ref }} | perl -pE 's|.*?/.*?/||g' | cut -c -63 | sed -E 's/[^a-z0-9-]+/-/g' | sed -E 's/^-*([a-z0-9-]+[a-z0-9])-*$$/\1/g')" >> $GITHUB_OUTPUT

      - name: Fetch branches
        run: |
          if [ ! -z ${{ steps.branches.outputs.target }} ]; then
            git fetch origin ${GITHUB_BASE_REF}
          else
            git fetch origin ${{ github.event.before }}
          fi
      - name: Container tag
        id: container_tag
        run: |
          BASE=${{ vars.DOCKER_REGISTRY }}/${{ vars.DOCKER_REPOSITORY }}/${{ inputs.image_name }}
          if [ ! -z ${{ steps.branches.outputs.target }} ]; then
            echo "tag=$BASE:${{ steps.branches.outputs.source }}" >> $GITHUB_OUTPUT
            echo "prev_tag=$BASE:${{ steps.branches.outputs.target }}" >> $GITHUB_OUTPUT
          else
            echo "tag=$BASE:${{ steps.branches.outputs.branch }}" >> $GITHUB_OUTPUT
            echo "prev_tag=$BASE:${{ steps.branches.outputs.branch }}" >> $GITHUB_OUTPUT
          fi
      - name: Dockerfile changed
        id: dockerfile
        run: |
          DIFF=""

          if [ -z "${GITHUB_BASE_REF}" ]; then
            DIFF="${{ github.event.before }}"
          else
            DIFF="origin/${GITHUB_BASE_REF}"
          fi

          if [ -n "$(git diff --name-only HEAD $DIFF -- ${{ inputs.dockerfile }})" ];
          then
            echo 'changed=True' >> $GITHUB_OUTPUT
          fi
      - name: Docker prev build
        id: docker_prev_build
        if: steps.dockerfile.outputs.changed != 'True'
        run: |
          if docker buildx imagetools create -t ${{ steps.container_tag.outputs.tag }} \
             ${{ steps.container_tag.outputs.prev_tag }} ;
          then
            echo 'Successfully synced image'
            echo 'exists=True' >> $GITHUB_OUTPUT
          fi
      - name: Build Testing docker image
        uses: docker/build-push-action@v4
        if: steps.dockerfile.outputs.changed == 'True' || steps.docker_prev_build.outputs.exists != 'True'
        with:
          push: true
          file: ${{ inputs.dockerfile }}
          tags: ${{ steps.container_tag.outputs.tag }}