code: func (h *netlinkHandle) EnsureDummyDevice(devName string) (bool, error) {
  	_, err := h.LinkByName(devName)
  	if err == nil {
  		// found dummy device
  		return true, nil
  	}
  	dummy := &netlink.Dummy{
  		LinkAttrs: netlink.LinkAttrs{Name: devName},
  	}
  	return false, h.LinkAdd(dummy)
  }
docs: // EnsureDummyDevice is part of interface