ahmetb/kubectx · error

failed to save kubeconfig file after modification: %w

Error message

failed to save kubeconfig file after modification: %w

What it means

kc.Save() failed to write the kubeconfig after removing current-context. The modification succeeded in memory; persistence to disk failed on permissions, read-only files, or a Reset/encode error in the multi-file save loop.

Source

Thrown at cmd/kubectx/unset.go:42

// UnsetOp indicates intention to remove current-context preference.
type UnsetOp struct{}

func (_ UnsetOp) Run(_, stderr io.Writer) error {
	if err := checkIsolatedMode(); err != nil {
		return err
	}
	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
	defer kc.Close()
	if err := kc.Parse(); err != nil {
		return fmt.Errorf("kubeconfig error: %w", err)
	}

	if err := kc.UnsetCurrentContext(); err != nil {
		return fmt.Errorf("error while modifying current-context: %w", err)
	}
	if err := kc.Save(); err != nil {
		return fmt.Errorf("failed to save kubeconfig file after modification: %w", err)
	}

	err := printer.Success(stderr, "Active context unset for kubectl.")
	if err != nil {
		return fmt.Errorf("write error: %w", err)
	}
	return nil
}

View on GitHub (pinned to 12ad6fb22e)

Solutions

1. Check write permission on every KUBECONFIG file
2. Ensure no read-only mount protects the files
3. Verify disk space and retry kubectx -u

When it happens

Trigger: Thrown at cmd/kubectx/unset.go:42 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/c1281b925226a535. Report an issue: GitHub.