jq: array contains array containing key with value?

In one of our Kubernetes clusters, there are a number of pods failing with “ImagePullBackOff”. I want to find the nodes on which these pods are running.

I could just do something like this:

kubectl get pods -A -o wide | grep ImagePullBackOff | awk '{print $8}' | sort | uniq

But I wanted to use jq.

In the end, I came up with two options. The first uses a nested select:

kubectl get pods -A -o json | \
    jq '.items[] |
        select((.status.containerStatuses[] |
            select(.state.waiting.reason == "ImagePullBackOff"))) |
        .spec.nodeName'

I think I prefer this one using any(_ ; _), though:

kubectl get pods -A -o json | \
    jq '.items[] |
        select(
            any(
                .status.containerStatuses[];
                .state.waiting.reason == "ImagePullBackOff")) |
        .spec.nodeName'

That is: inside items[], look at status.containerStatuses[]. Do any of them have .state.waiting.reason set to "ImagePullBackOff"?

For non-K8s people out there, the JSON looks like this (severely trimmed):

{
    "items": [
        {
            "spec": {
                "nodeName"
            },
            "status": {
                "containerStatuses": [
                    {
                        "state": {
                            "waiting": {
                                "reason": "ImagePullBackOff"
                            }
                        }
                    }
                ]
            }
        }
    ]
}