ahmetb/kubectx · error

failed to merge %s: %w

Error message

failed to merge %s: %w

What it means

In the multi-file merge path of Bytes, mergeSequences failed while combining the named top-level list (contexts, clusters, or users) across kubeconfig files. The key name is interpolated so the failing section is identifiable; the cause is malformed entries in one file's list.

Source

Thrown at internal/kubeconfig/kubeconfig.go:136

	}

	if len(k.files) == 1 {
		str, err := k.files[0].config.String()
		if err != nil {
			return nil, err
		}
		return []byte(str), nil
	}

	// Build a merged config for multi-file case.
	// Start with a copy of the first file's structure.
	merged := k.files[0].config.Copy()

	// Merge contexts, clusters, and users from all files (first wins for duplicates).
	for _, key := range []string{"contexts", "clusters", "users"} {
		mergedSeq, err := mergeSequences(k.files, key)
		if err != nil {
			return nil, fmt.Errorf("failed to merge %s: %w", key, err)
		}
		if mergedSeq != nil {
			if err := merged.PipeE(yaml.SetField(key, mergedSeq)); err != nil {
				return nil, err
			}
		}
	}

	// Use the first non-empty current-context.
	cur, err := k.GetCurrentContext()
	if err != nil {
		return nil, fmt.Errorf("failed to get current context for merge: %w", err)
	}
	if cur != "" {
		if err := merged.PipeE(yaml.SetField("current-context", yaml.NewScalarRNode(cur))); err != nil {
			return nil, err
		}
	}

View on GitHub (pinned to 12ad6fb22e)

Solutions

1. Check the reported section (contexts/clusters/users) in each KUBECONFIG file for entries missing 'name' or malformed structure
2. Normalize or remove the offending entries
3. Use kubectl config view to see where merging also fails

When it happens

Trigger: Thrown at internal/kubeconfig/kubeconfig.go:136 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of ahmetb/kubectx@12ad6fb22e (2026-09-02). Data as JSON: /api/errors/5c365be62128b9b9. Report an issue: GitHub.