ahmetb/kubectx · error

failed to get current namespace: %w

Error message

failed to get current namespace: %w

What it means

After reading the current context name, switchNamespace calls kc.NamespaceOfContext(ctx) to determine the namespace currently set for that context. This error wraps any failure from that lookup, such as the context entry missing or malformed in the kubeconfig. Thrown at cmd/kubens/switch.go:61.

Source

Thrown at cmd/kubens/switch.go:61

	toNS, err := switchNamespace(kc, s.Target, s.Force)
	if err != nil {
		return err
	}
	err = printer.Success(stderr, "Active namespace is \"%s\"", printer.SuccessColor.Sprint(toNS))
	return err
}

func switchNamespace(kc *kubeconfig.Kubeconfig, ns string, force bool) (string, error) {
	ctx, err := kc.GetCurrentContext()
	if err != nil {
		return "", fmt.Errorf("failed to get current context: %w", err)
	}
	if ctx == "" {
		return "", errors.New("current-context is not set")
	}
	curNS, err := kc.NamespaceOfContext(ctx)
	if err != nil {
		return "", fmt.Errorf("failed to get current namespace: %w", err)
	}

	f := NewNSFile(ctx)
	prev, err := f.Load()
	if err != nil {
		return "", fmt.Errorf("failed to load previous namespace from file: %w", err)
	}

	if ns == "-" {
		if prev == "" {
			return "", fmt.Errorf("No previous namespace found for current context (%s)", ctx)
		}
		ns = prev
	}

	if !force {
		ok, err := namespaceExists(kc, ns)
		if err != nil {

View on GitHub (pinned to 12ad6fb22e)

Solutions

1. Run kubectl config get-contexts to see whether the current context actually exists
2. Reset current-context to a valid one: kubectl config use-context <valid-name>, then retry kubens
3. Remove the stale pointer: kubectl config unset current-context, then set it again
4. If a merged KUBECONFIG is the cause, inspect each file listed in $KUBECONFIG for missing context stanzas

Example fix

// before
# kubeconfig has current-context: staging but no 'staging' entry in contexts
// after
kubectl config use-context production   # pick a context that exists
kubens default

ctxName, err := kc.GetCurrentContext()
if err == nil && ctxName != "" {
    ok := false
    for _, c := range kc.Contexts() { if c.Name() == ctxName { ok = true; break } }
    if !ok { return fmt.Errorf("current-context %q has no context entry", ctxName) }
}

curNS, err := kc.NamespaceOfContext(ctx)
if err != nil {
    return fmt.Errorf("context %q missing/invalid in kubeconfig; run `kubectl config get-contexts`: %w", ctx, err)
}

When it happens

Trigger: kc.NamespaceOfContext(ctx) errors because the context named by current-context is absent from the contexts list, the context stanza lacks required fields (cluster/user), or the kubeconfig is structurally invalid after the initial parse.

Common situations: current-context points to a context deleted by another tool (stale pointer); hand-edited kubeconfig removed a context but left current-context set; merged KUBECONFIG files where one fragment is incomplete.

Related errors

• failed to get current context: %w
• failed to change to namespace "%s": %w
• kubeconfig error: %w
• failed to get current context: %w
• failed to read namespace of "%s": %w

AI-assisted analysis of ahmetb/kubectx@12ad6fb22e (2026-09-02). Data as JSON: /api/errors/19bde491bbc77034. Report an issue: GitHub.