openapi2jsonschema.py silently fails when using "version" instead of "versions"

[michohl]

When running openapi2jsonschema.py on a CRD that doesn't contain a versions key it will silently fail.

I'm using the following as an example (referred to as test.yml)

apiVersion: example.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: foo.bar.io
  annotations:
    "helm.sh/resource-policy": keep
spec:
  group: asdf.io
  version: v1
  scope: Namespaced
  names:
    plural: foos
    singular: foo
    kind: Foo
    shortNames:
    - fo

If I run the script with this file I get the following behavior:

(.venv) $ ./kubeconform/scripts/openapi2jsonschema.py test.yml
(.venv) $ echo $?
0

I believe this is caused by our spec above not including a versions key since it's using version instead. So it fails out of the original if condition but it is also not using validation so we fail the elif condition as well which means we end up doing nothing with the entire file.

I'm hoping either openapi2jsonschema.py could be modified to respect a singular version as specified in my example or if that is not possible then at least the script will present an error and a non-zero exit code for the user.