Required field in JSON schema that can be oneOf: string, null, not handled correctly

[TylerGillson]

Given the following JSON schema:

{
    "title": "dummy schema",
    "$ref": "#/definitions/All",
    "definitions": {
        "All": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
                "dummy": {
                    "$ref": "#/definitions/Dummy"
                }
            }
        },
        "Dummy": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
                "irsaRole": {
                    "oneOf": [
                        {
                            "type": "string",
                            "pattern": "^arn:aws:iam:.+$",
                            "minLength": 20
                        },
                        {
                            "type": "null"
                        }
                    ]
                }
            },
            "required": [
                "irsaRole"
            ],
            "title": "Dummy"
        }
    }
}

And the following values.yaml:

dummy:
  irsaRole: null

I get a validation error:

Error: INSTALLATION FAILED: values don't meet the specifications of the schema(s) in the following chart(s):
dummy:
- dummy: irsaRole is required

What I expected: chart validation should pass.

Examples from jsonschemavalidator.net:

• Validation passing with null value
• Validation passing with ARN value

Output of helm version:

version.BuildInfo{Version:"v3.14.4", GitCommit:"81c902a123462fd4052bc5e9aa9c513c4c8fc142", GitTreeState:"clean", GoVersion:"go1.22.2"}

Output of kubectl version:

Client Version: version.Info{Major:"1", Minor:"27", GitVersion:"v1.27.2", GitCommit:"7f6f68fdabc4df88cfea2dcf9a19b2b830f1e647", GitTreeState:"clean", BuildDate:"2023-05-17T14:13:27Z", GoVersion:"go1.20.4", Compiler:"gc", Platform:"darwin/arm64"}
Kustomize Version: v5.0.1
Server Version: version.Info{Major:"1", Minor:"28", GitVersion:"v1.28.3", GitCommit:"a8a1abc25cad87333840cd7d54be2efaf31a3177", GitTreeState:"clean", BuildDate:"2023-10-18T11:33:18Z", GoVersion:"go1.20.10", Compiler:"gc", Platform:"linux/amd64"}

Cloud Provider/Platform (AKS, GKE, Minikube etc.):
AWS

[gjenkins8]

Can you create a more detailed replication example please. From a quick hack up using your jsonschema, if I use the values:

---
dummy:
  irsaRole: "foo"

I get the error:

 $ helm template .
Error: values don't meet the specifications of the schema(s) in the following chart(s):
jschema:
- dummy.irsaRole: Must validate one and only one schema (oneOf)
- dummy.irsaRole: String length must be greater than or equal to 20
- dummy.irsaRole: Does not match pattern '^arn:aws:iam:.+$'

---

Is there a subchart 'dummy'?

[TylerGillson]

@gjenkins8 apologies for the non-reproducible example. The real source for this issue is the k8gb Helm chart. I can also try to get you a more minimal example if you'd prefer.

[TylerGillson]

Steps to reproduce:

❯ git clone https://github.com/k8gb-io/k8gb && cd k8gb/chart/k8gb
❯ helm dependency build
❯ sed -i '' 's|arn:aws:iam::111111:role/external-dns|null|g' values.yaml
❯ helm install k8gb . --create-namespace -f values.yaml
Error: INSTALLATION FAILED: values don't meet the specifications of the schema(s) in the following chart(s):
k8gb:
- route53: irsaRole is required