name: Build Dockerfiles

on:
  push:
    branches-ignore:
      - coverity_scan
  workflow_dispatch:

env:
  CI: 1
  GH_ACTIONS: 1
  DEBIAN_FRONTEND: noninteractive
  APT_OPTS: "-y --no-install-recommends"

jobs:
  #
  #  Generate matrix based on docker directories.
  #
  gen-matrix:

    runs-on: ubuntu-latest

    outputs:
      matrix: ${{ steps.gen-matrix.outputs.matrix }}

    steps:

    - uses: actions/checkout@v4
      with:
        lfs: false

    - id: gen-matrix
      name: Generate matrix based on docker targets
      run: |
        cd scripts/docker/dists
        M=$(ls | perl -n -e '{chomp; push @L,"\"$_\""} END{print "{\"env\":[{\"OS\":",join("},{\"OS\":",@L),"}]}"}')
        echo "Matrix: $M"
        echo matrix=$M >> $GITHUB_OUTPUT

  #
  #  Run docker target for each given OS. This will build the
  #  Docker image.
  #
  docker:
    needs:
      - gen-matrix

    runs-on: ubuntu-20.04

    strategy:
      fail-fast: false
      matrix: ${{ fromJson(needs.gen-matrix.outputs.matrix) }}

    env: ${{ matrix.env }}

    name: "v3.2.x-${{ matrix.env.OS }}"

    steps:

    - uses: actions/checkout@v4
      with:
        fetch-depth: 1

    - name: Regenerate Dockerfile
      run: |
        rm scripts/docker/dists/$OS/Dockerfile || true
        make docker.$OS.regen

    - name: Build docker image
      run: |
        make docker.$OS.build

    #
    #  If the CI has failed and the branch is ci-debug then start a tmate
    #  session. SSH rendezvous point is emited continuously in the job output.
    #
    - name: "Debug: Start tmate"
      uses: mxschmitt/action-tmate@v3
      with:
        limit-access-to-actor: true
      if: ${{ github.ref == 'refs/heads/ci-debug' && failure() }}