check-image-definitions.yml

---
# Check that declared Packer images are valid.
name: Validate Packer images

'on':
  - push
  - pull_request

permissions:
  contents: read

jobs:
  validate:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3

      - name: Install prerequisites
        run: |
          sudo apt update -y

          # The packer provided by Ubuntu repos is ancient
          curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo apt-key add -
          sudo apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"
          sudo apt-get update && sudo apt-get install packer
          packer plugins install github.com/hashicorp/docker

      - name: Validate Packer images
        run: |
          error=0
          for decl in */packer.json; do
            pushd "$(dirname "$decl")"
            if ! packer validate packer.json; then
              echo -n "::error file=$decl,line=1,title=packer validate failed"
              echo "::Packer validation failed for $decl."
              error=1
            fi
            popd
          done
          exit $error