kubernetes/kops · error

expected slice at %q, got %T

Error message

expected slice at %q, got %T

What it means

JSONObject.Slice found the key present in the SQS policy document but holding a non-array value; during policy normalization kOps expected a JSON array at that position (e.g. Statement/Action) and got another type.

Source

Thrown at upup/pkg/fi/cloudup/awstasks/sqs.go:159

		Tags:                   intersectSQSTags(tags.Tags, q.Tags),
	}

	// Avoid flapping
	q.ARN = actual.ARN

	return actual, nil
}

type JSONObject map[string]any

func (j *JSONObject) Slice(key string) ([]any, bool, error) {
	v, found := (*j)[key]
	if !found {
		return nil, false, nil
	}
	s, ok := v.([]any)
	if !ok {
		return nil, false, fmt.Errorf("expected slice at %q, got %T", key, v)
	}
	return s, true, nil
}

func (j *JSONObject) Object(key string) (JSONObject, bool, error) {
	v, found := (*j)[key]
	if !found {
		return nil, false, nil
	}
	m, ok := v.(JSONObject)
	if !ok {
		return nil, false, fmt.Errorf("expected object at %q, got %T", key, v)
	}
	return m, true, nil
}

// normalizePolicy sorts the Service principals in the policy, so that we can compare policies more easily.
func normalizePolicy(policy map[string]interface{}) error {

View on GitHub (pinned to 4c8573c808)

Solutions

1. Fix the policy document so the referenced key is a JSON array (e.g. "Action": [ ... ])
2. Ensure Statement blocks follow the expected IAM policy structure

When it happens

Trigger: Thrown at upup/pkg/fi/cloudup/awstasks/sqs.go:159 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/089710c6fd0e4ddc. Report an issue: GitHub.