Enable pod support

[ZhaoXuqiang]

share a pod with existing container, with --net container:xxx
get shared container by compare pid with exist running container's Pid which found from container's state file

Signed-off-by: Zhang Wei zhangwei555@huawei.com
Signed-off-by: ZhaoXuqiang zhaoxuqiang@huawei.com

[WeiZhang555]

Please modify your commit message to describe more about this modifcations, also remove "cherry-pick from cfd4695 and 81d42e4", 81d42e4 isn't included in these codes and is outdated so you don't need to mention it. @ZhaoXuqiang

[WeiZhang555]

Can you keep

-	_, err = os.Stat(filepath.Join(root, sharedContainer, stateJSON)) -	if err != nil { -	return fmt.Errorf("The container %q is not existing or not ready", sharedContainer) -	} -	_, err = os.Stat(filepath.Join(root, sharedContainer, "namespace")) -	if err != nil { -	return fmt.Errorf("The container %q is not ready", sharedContainer) 

This piece of code is used for validation, I think it's still useful.

[ZhaoXuqiang]

I think it's not useful.

	if sharedContainer != "" {	scState, err = loadStateFile(root, sharedContainer)	if err != nil {	return err	}	vm, lockFile, err = getSandbox(filepath.Join(context.GlobalString("root"), sharedContainer, "sandbox"))	if err != nil {	return err	}	} 

func loadStateFile(root, container string) (*State, error) {	stateFile := filepath.Join(root, container, stateJSON)	file, err := os.Open(stateFile)	if err != nil {	return nil, err	}	defer file.Close()	var state State	if err = json.NewDecoder(file).Decode(&state); err != nil {	return nil, fmt.Errorf("Decode state file %s error: %s", stateFile, err.Error())	}	return &state, nil } 

loadStateFile will confirm the state file exist.
namespace file is not used.

[WeiZhang555]

Looks like it's OK then.

ping @laijs

[laijs]

LGTM