meta-raspberrypi/.github/actions/docker-build/action.yml

# SPDX-FileCopyrightText: Andrei Gherzan <andrei.gherzan@huawei.com>
#
# SPDX-License-Identifier: MIT

name: "Build a docker image"

inputs:
  docker_image:
    required: true
    description: "The name of the docker image"
  id:
    required: true
    description: "Namespace for the image"

runs:
  using: "composite"
  steps:
    - name: Build the ${{ inputs.docker_image }} docker image
      shell: bash
      # We run this unconditinally even if the change doesn't touch the
      # relevant docker files because there is a chance that another PR (or
      # something else) rebuilt the local image. For example if the first
      # version of the PR included change for the relevant docker image but a
      # subsequent push to the PR branch dropped them. In this way we rebuild
      # the image to avoid using the changes from the previous push.
      run: |
        cd .github/workflows/docker-images/
        # We build a temporary image namespaced by the PR number so we can
        # handle multiple runners on the same host using the same docker
        # storage.
        tries=3
        n=1
        until [ "$n" -gt "$tries" ]; do
          echo "Building the docker image ${{ inputs.docker_image }}-${{ inputs.id }}... try $n..."
          if docker build . -f "${{ inputs.docker_image }}/Dockerfile" -t "${{ inputs.docker_image }}-${{ inputs.id }}"; then
            # This can fail if a dangling images cleaning job runs in
            # parallel. So we try this a couple of times to minimize
            # conflict. This is because while building, docker creates a
            # untagged image first (dangling) before tagging it at the end.
            # If between these two operations a dangling cleanup happens,
            # build fails.
            break
          fi
          n=$((n+1))
        done
        [ "$n" -lt "$tries" ]
        echo "Temporary image built in ${{ inputs.docker_image }}."