if netNs == "" {
		return s.getNetns(pod)
	}
	return s.openNetns(pod, netNs)
}

func (s *NetServer) openNetns(pod *corev1.Pod, netNs string) (Netns, error) {
	return s.currentPodSnapshot.UpsertPodCache(pod, netNs)
}

func (s *NetServer) getNetns(pod *corev1.Pod) (Netns, error) {
	openNetns := s.currentPodSnapshot.Get(string(pod.UID))
	if openNetns != nil {
		return openNetns, nil
	}

		openNetns:       openNetns,
		currentPodCache: map[string]WorkloadInfo{},
	}
}

func (p *podNetnsCache) UpsertPodCache(pod *corev1.Pod, nspath string) (Netns, error) {
	newnetns, err := p.openNetns(nspath)
	if err != nil {
		return nil, err
	}
	wl := WorkloadInfo{
		Workload: podToWorkload(pod),
		Netns:    newnetns,
	}
	return p.UpsertPodCacheWithNetns(string(pod.UID), wl), nil
}

package nodeagent

import "errors"

func inodeForFd(n NetnsFd) (uint64, error) {
	return 0, errors.New("not implemented")
}

func NetnsSet(n NetnsFd) error {
	return errors.New("not implemented")
}

func OpenNetns(nspath string) (NetnsCloser, error) {
	return nil, errors.New("not implemented")
}

// inspired by netns.Do() but with an existing fd.
func NetnsDo(fdable NetnsFd, toRun func() error) error {

	}

	if !reflect.DeepEqual(netns1, netns2) {
		t.Fatalf("Expected the same Netns for the same uid, got %v and %v", netns1, netns2)
	}

	if counter.Load() != 2 {
		t.Fatalf("Expected openNetns to be called twice, got %d", counter.Load())
	}
}

func TestUpsertPodCacheWithNewInode(t *testing.T) {
	counter.Store(0)

	p := newPodNetnsCache(openNsTestOverrideWithInodes(1, 2))

// See the License for the specific language governing permissions and
// limitations under the License.

package nodeagent

import "testing"

func TestOpenNetns(t *testing.T) {
	ns, err := OpenNetns("/proc/self/ns/net")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	// the inode for netns is proc dynamic, so it needs to be higher than
	// #define PROC_DYNAMIC_FIRST 0xF0000000U

func (n *NetnsWrapper) Fd() uintptr {
	return n.innerNetns.Fd()
}

func inodeForFd(n NetnsFd) (uint64, error) {
	stats := &unix.Stat_t{}
	err := unix.Fstat(int(n.Fd()), stats)
	return stats.Ino, err
}

func OpenNetns(nspath string) (NetnsCloser, error) {
	n, err := netns.GetNS(nspath)
	if err != nil {
		return nil, err
	}
	i, err := inodeForFd(n)
	if err != nil {
		n.Close()
		return nil, err
	}