feature:support live-restore

[ningmingxiao]

nerdctl old version call task.Wait to wait container stop, but if containerd stop task.Wait will return. So I find a better way to solve this we can let nerdctl call shim api to get container status.

[AkihiroSuda]

What about non-linux unix?

[ningmingxiao]

I'm not sure how to connect unix shim or windows shim, does containerd-shim-runc-v2 works well on unix? @AkihiroSuda

[ningmingxiao]

	config := &Config{
		ID:        os.Getenv("CONTAINER_ID"),
		Namespace: os.Getenv("CONTAINER_NAMESPACE"),
		Stdout:    os.NewFile(3, "CONTAINER_STDOUT"),
		Stderr:    os.NewFile(4, "CONTAINER_STDERR"),
	}

I'm trying to find a way to avoid call task.Wait or call shim api.
if container main process exited. the pipe reader should know the writer is closed. but I can't find a good way to know pipe writer is closed. @AkihiroSuda

[ningmingxiao]

I try get EPOLLHUP event but it doesn’t work.

[ningmingxiao]

another way is to monitor /proc/container_pid to know container exited.