name: Docker Image Build
description: Builds Cobalt build docker images.
inputs:
  docker_service:
    description: "Docker compose service."
    required: true
  docker_image:
    description: "Docker image name."
    required: true

runs:
  using: "composite"
  steps:
    - name: Rename Limit
      run: git config diff.renameLimit 999999
      shell: bash
    - name: Get docker file changes
      id: changed-files
      uses: tj-actions/changed-files@2d756ea4c53f7f6b397767d8723b3a10a9f35bf2 # v44
      with:
        files_ignore: third_party/**
        files: |
          docker-compose.yml
          docker/linux/**
          .github/actions/docker/**
    - name: Retrieve Docker metadata
      id: meta
      uses: docker/metadata-action@507c2f2dc502c992ad446e3d7a5dfbe311567a96 # v4.3.0
      with:
        images: ${{env.REGISTRY}}/${{github.repository}}/${{inputs.docker_image}}
        tags: |
          type=ref,event=branch
          type=ref,event=tag
          type=ref,event=pr
    - name: Set Docker Tag
      id: set-docker-tag
      run: |
        set -x
        docker_tag="${{ steps.meta.outputs.tags }}"
        docker_tag="${docker_tag%.1[+,-]}"
        echo "DOCKER_TAG=${docker_tag}" >> $GITHUB_ENV
      shell: bash
    # We need to set docker tag properly for pull requests.  In those scenarios where no docker related files
    # were changed we need to use an existing image (e.g. main).  In cases where docker image is rebuilt we have
    # to use tag generated by the image build.
    - name: Retrieve Docker metadata for PR
      id: pr-meta
      uses: docker/metadata-action@507c2f2dc502c992ad446e3d7a5dfbe311567a96 # v4.3.0
      with:
        images: ${{env.REGISTRY}}/${{github.repository}}/${{inputs.docker_image}}
        tags: type=raw,value=${{ github.base_ref }}
    - name: Set Docker Tag
      id: set-docker-tag-presubmit-non-fork
      env:
        REPO: ${{ github.repository }}
      if: ${{ (steps.changed-files.outputs.any_changed == 'false') && (github.event_name == 'pull_request') }}
      run: |
        set -x
        docker_tag="${{ steps.pr-meta.outputs.tags }}"
        docker_tag="${docker_tag%.1[+,-]}"
        echo "DOCKER_TAG=${docker_tag}" >> $GITHUB_ENV
      shell: bash
    - name: Set up Cloud SDK
      if: ${{ (steps.changed-files.outputs.any_changed == 'true') && (github.event_name == 'pull_request') && (github.event.pull_request.head.repo.fork) }}
      uses: isarkis/setup-gcloud@40dce7857b354839efac498d3632050f568090b6 # v1.1.1
    - name: Set Docker Tag
      id: set-docker-tag-presubmit-fork
      env:
        GITHUB_EVENT_NUMBER: ${{ github.event.number }}
      if: ${{ (steps.changed-files.outputs.any_changed == 'true') && (github.event_name == 'pull_request') && (github.event.pull_request.head.repo.fork) }}
      run: |
        # Need to login to GCR to be able to push images created by fork based PR workflows.
        PROJECT_NAME=$(gcloud config get-value project)
        METADATA="http://metadata.google.internal./computeMetadata/v1"
        SVC_ACCT="${METADATA}/instance/service-accounts/default"
        ACCESS_TOKEN=$(curl -H 'Metadata-Flavor: Google' ${SVC_ACCT}/token | cut -d'"' -f 4)
        printf ${ACCESS_TOKEN} | docker login -u oauth2accesstoken --password-stdin https://gcr.io
        echo "DOCKER_TAG=gcr.io/${PROJECT_NAME}/${{inputs.docker_image}}:pr-${GITHUB_EVENT_NUMBER}" >> $GITHUB_ENV
      shell: bash
    - name: Process Docker metadata
      id: process-docker-metadata
      run: |
        set -x
        set +e
        docker manifest inspect $DOCKER_TAG > /dev/null
        if [[ $? -ne 0 || ${{ steps.changed-files.outputs.any_changed }} == 'true' ]]; then
          echo "need_to_build=true" >> $GITHUB_ENV
        else
          echo "need_to_build=false" >> $GITHUB_ENV
        fi
      shell: bash
    - name: Build containers with Docker Compose
      id: build-image
      if: env.need_to_build == 'true'
      env:
        SERVICE: ${{inputs.docker_service}}
      shell: bash
      run: |
        set -xue
        DOCKER_BUILDKIT=0 docker compose -f docker-compose.yml up --build --no-start "${SERVICE}"
    - name: Tag images
      id: tag-images
      if: env.need_to_build == 'true'
      run: docker tag ${{inputs.docker_image}} $DOCKER_TAG
      shell: bash
    - name: Push images
      id: push-image
      if: env.need_to_build == 'true'
      run: docker push ${DOCKER_TAG}
      shell: bash