// ErrInvalid or ErrNotExist.
func (ffs *fakeFsWithFakeFds) Open(name string) (fs.File, error) {
	f, err := ffs.ReadDirFS.Open(name)
	if err != nil {
		return nil, err
	}
	return wrapFile(f), nil
}

func wrapFile(f fs.File) fs.File {
	return &fakeFileFakeFds{File: f, fd: 0}
}

type fakeIptablesDeps struct {
	AddRouteErr           error
	AddInpodMarkIPRuleCnt atomic.Int32