Function ValidateLabel

opts/opts.go:239–249

ValidateLabel validates that the specified string is a valid label, and returns it. Labels are in the form of key=value; key must be a non-empty string, and not contain whitespaces. A value is optional (defaults to an empty string if omitted). Leading whitespace is removed during validation but va

(value string)

// TODO discuss if quotes (and other special characters) should be valid or invalid for keys
// TODO discuss if leading/trailing whitespace in keys should be preserved (and valid)
func ValidateLabel(value string) (string, error) {
	key, _, _ := strings.Cut(value, "=")
	key = strings.TrimLeft(key, whiteSpaces)
	if key == "" {
		return "", fmt.Errorf("invalid label '%s': empty name", value)
	}
	if strings.ContainsAny(key, whiteSpaces) {
		return "", fmt.Errorf("label '%s' contains whitespaces", key)
	}
	return value, nil
}

// ValidateSysctl validates a sysctl and returns it.
func ValidateSysctl(val string) (string, error) {