build-matrices.yaml

name: Container (Demo) Build Matrices

on:
  # Enable for testing builds for a PR
  pull_request: []
  push:
    branches:
    - main
  workflow_dispatch:

jobs:
  generate:
    name: Generate Build Matrix
    runs-on: ubuntu-latest
    outputs:
      dockerbuild_matrix: ${{ steps.dockerbuild.outputs.dockerbuild_matrix }}
      empty_matrix: ${{ steps.dockerbuild.outputs.dockerbuild_matrix_empty }}

    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0

    - name: Get changed files
      id: changed-files
      uses: tj-actions/changed-files@aa52cfcd81f1a00a6bf1241a8cad6adec4d80638 # v33
      with:
        separator: " "

    - name: Convert changed Dockerfile to uptodate
      id: parsed_files
      env:
        changed_files: ${{ steps.changed-files.outputs.all_changed_files }}
      run: /bin/bash .github/scripts/prepare_paths.sh

    - name: Generate Build Matrix
      uses: vsoch/uptodate@main
      id: dockerbuild
      with: 
        root: ${{ steps.parsed_files.outputs.parsed_files }}
        parser: dockerbuild
        flags: "--registry ghcr.io/rse-ops --all"

    - name: View and Check Build Matrix Result
      env:
        result: ${{ steps.dockerbuild.outputs.dockerbuild_matrix }}
      run: |
        echo ${result}
        if [[ "${result}" == "[]" ]]; then
          printf "The matrix is empty, will not trigger next workflow.\n"
        else
          printf "The matrix is not empty, and we should continue on to the next workflow.\n"
        fi

  build:
    needs:
    - generate
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        result: ${{ fromJson(needs.generate.outputs.dockerbuild_matrix) }}
        arch: [linux/amd64]

    if: ${{ needs.generate.outputs.empty_matrix == 'false' }}

    name: Build ${{ matrix.result.container_name }} ${{ matrix.arch[0] }}
    steps:
    - name: Checkout Repository
      uses: actions/checkout@v4
    - uses: actions/setup-go@v3

    - name: GHCR Login
      if: (github.event_name != 'pull_request')
      uses: docker/login-action@v2
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v2

   # Uncomment if need more build space   
   # - name: Run Actions Cleaner
   #   uses: rse-ops/actions-cleaner/ubuntu@main

    - name: Pull Docker Layers
      env:
        container: ${{ matrix.result.container_name }}
      run: docker pull ghcr.io/rse-ops/${container} || exit 0

    - name: Set up QEMU
      uses: docker/setup-qemu-action@v2

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v2

    - name: Prepare ${{ matrix.result.container_name }}
      id: builder
      env:
        container: ${{ matrix.result.container_name }}
        prefix: ${{ matrix.result.command_prefix }}
        filename: ${{ matrix.result.filename }}
      run: |
        basedir=$(dirname $filename)
        container=$(python -c "print('${container}'.strip('-'))")
        printf "Base directory is ${basedir}\n"
        # Get relative path to PWD and generate dashed name from it
        cd $basedir
        echo "${prefix} -t ${container} ."
        build_args="$(echo "${prefix#*--build-arg}")"
        # Add build-arg for anaconda download
        echo "dockerfile_dir=${basedir}" >> $GITHUB_ENV
        echo "build_args=${build_args}" >> $GITHUB_ENV
        echo "container=${container}" >> $GITHUB_ENV
        echo "filename=${filename}" >> $GITHUB_ENV

    - name: Build ${{ matrix.dockerfile[1] }}
      uses: docker/build-push-action@v3
      with:
        context: ${{ env.dockerfile_dir }}
        file: ${{ env.filename }}
        platforms: ${{ matrix.arch[0] }}
        push: ${{ github.event_name != 'pull_request' }}
        build-args: |
          ${{ env.build_args }}
        tags: ${{ env.container }}