openapi-version-check.yml

name: Openapi Version Check
run-name: Verify version is bumped when openapi.yaml is updated

on: # yamllint disable-line rule:truthy
  pull_request:
    branches: ["main"]
    paths: ["openapi/openapi.yaml"]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2
        with:
          # checkout full tree
          fetch-depth: 0

      - name: Get new version
        id: new_version
        run: |
          version=$(sed -n "s/^  version: \"\(.*\)\"$/\1/p" openapi/openapi.yaml)
          echo "::set-output name=version::$version"
          echo "new version: $version"

      - name: Get previous version
        id: prev_version
        run: |
          git checkout main
          version=$(sed -n "s/^  version: \"\(.*\)\"$/\1/p" openapi/openapi.yaml)
          echo "::set-output name=version::$version"
          echo "previous version: $version"

      - name: Openapi version check
        run: |
          function ver { printf "%03d%03d%03d" $(echo "$1" | tr '.' ' '); }
          do_version_check() {
            prev="$1"
            new="$2"
            if [ $(ver $prev) -lt $(ver $new) ]; then
              return 0
            elif [ $(ver $prev) -gt $(ver $new) ]; then
              echo "ERROR: The new openapi version needs to be greater than \
              the previous verison."
            else
              echo "ERROR: Same openapi version. Remember to bump up openapi \
              version after modifying openapi/openapi.yaml"
            fi

            echo "previous version:" $prev
            echo "new version (the version just pushed):" $new
            return 1
          }
          do_version_check ${{steps.prev_version.outputs.version }} \
          ${{steps.new_version.outputs.version }}