schema_validation.yaml

name: Schema validation

on:
  pull_request:
    types:
      - opened
      - reopened
      - synchronize

jobs:
  validate:
    name: Validate changed files against JSON schema
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: Install yq
        run: |
          brew install yq
      - name: Install jsonschema
        run: |
          python -m pip install jsonschema
      - name: Get changed files
        id: changed-files
        uses: tj-actions/changed-files@v21
      - name: Validate against JSON schema
        run: |
          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
            if [[ "$file" == ".github/"* ]] || [[ "$file" != *".yaml" ]]; then
              continue
            fi

            echo -n "Validating file '$file'... "

            # yq cannot be piped to pip's jsonschema, so I create a temp file
            yq -o json "$file" > "$file".json
            jsonschema -i "$file".json .github/schema.json 2> stderr.log || true
            rm -rf "$file".json

            if [ -s stderr.log ]; then
              echo "ERROR"
              cat stderr.log
              rm stderr.log
              exit 1
            else
              echo "OK"
            fi
          done