lint.yml

name: Lint

on:
  pull_request:
    branches:
      - master
    paths:
      - '**/Dockerfile'
      - '.github/workflows/lint.yml'

concurrency:
  group: ${{ github.head_ref }}-${{ github.workflow }}
  cancel-in-progress: true

jobs:
  hadolint:
    runs-on: ubuntu-24.04
    steps:
    - uses: actions/checkout@v4
    - uses: hadolint/hadolint-action@v3.1.0
      with:
        recursive: true
  ensure-dockerfiles-up-to-date:
    runs-on: ubuntu-24.04
    steps:
    - uses: actions/checkout@v4
    - name: Install GHC and Stack
      uses: haskell-actions/setup@v2.8.2
      with:
        enable-stack: true

    - name: Cache ~/.stack
      uses: actions/cache@v4.3.0
      with:
        path: ~/.stack
        key: ${{ runner.os }}-stack-home-${{ hashFiles('**/stack.yaml') }}
        restore-keys: |
          ${{ runner.os }}-stack-home-
    - name: "Cache generator binaries at generator/.stack-work"
      uses: actions/cache@v4.3.0
      with:
        path: |
          generator/.stack-work
        key: ${{ runner.os }}-stack-${{ hashFiles('**/stack.yaml') }}
        restore-keys: |
          ${{ runner.os }}-stack-

    - name: Download generator-binary release
      run: |
        gh release download generator-binary --repo haskell/docker-haskell --pattern 'generator' --dir artifacts
        chmod +x artifacts/generator
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

    - name: Ensure Dockerfiles are up-to-date
      run: |
        # Collect the list of Dockerfiles to be built
        mapfile -t dockerfiles < <(find . -type f -name 'Dockerfile' | sort)
        # Generate Dockerfiles using the generate.sh wrapper tool
        for df in "${dockerfiles[@]}"; do
          # Get appropriate YAML data file from the Dockerfile path
          df_dir=$(dirname "${df}")
          df_yaml="${df_dir}.yaml"
          if [ ! -f "${df_yaml}" ]; then
            echo "Error: Missing YAML data file ${df_yaml} for Dockerfile ${df}"
          else
            echo "Generating ${df}"
            ./generate.sh "${df_yaml}" "${df}.generated"
            # Compare generated Dockerfile with the existing one
            if ! diff -u "${df}" "${df}.generated"; then
                echo "Error: Dockerfile ${df} is out of date. Please regenerate it."
                exit 1
            fi
          fi
        done