package daemon
 

 import (

 	"strings"
 

 	"github.com/docker/docker/api/errdefs"

 	dockercontainer "github.com/docker/docker/container"

 	"github.com/docker/libnetwork"

 	"github.com/pkg/errors"

 	"github.com/sirupsen/logrus"

 )
 

 // ContainerRename changes the name of a container, using the oldName
 // to find the container. An error is returned if newName is already
 // reserved.

 func (daemon *Daemon) ContainerRename(oldName, newName string) error {

 	var (

 		sid string
 		sb  libnetwork.Sandbox

 	)
 

 	if oldName == "" || newName == "" {

 		return errdefs.InvalidParameter(errors.New("Neither old nor new names may be empty"))

 	}
 

 	if newName[0] != '/' {
 		newName = "/" + newName
 	}
 

 	container, err := daemon.GetContainer(oldName)

 	if err != nil {

 		return err

 	}
 

 	container.Lock()
 	defer container.Unlock()
 

 	oldName = container.Name

 	oldIsAnonymousEndpoint := container.NetworkSettings.IsAnonymousEndpoint

 	if oldName == newName {

 		return errdefs.InvalidParameter(errors.New("Renaming a container with the same name as its current name"))

 	}
 

 	links := map[string]*dockercontainer.Container{}
 	for k, v := range daemon.linkIndex.children(container) {
 		if !strings.HasPrefix(k, oldName) {

 			return errdefs.InvalidParameter(errors.Errorf("Linked container %s does not match parent %s", k, oldName))

 		}
 		links[strings.TrimPrefix(k, oldName)] = v
 	}
 

 	if newName, err = daemon.reserveName(container.ID, newName); err != nil {

 		return errors.Wrap(err, "Error when allocating new name")

 	}

 	for k, v := range links {

 		daemon.containersReplica.ReserveName(newName+k, v.ID)

 		daemon.linkIndex.link(container, v, newName+k)
 	}
 

 	container.Name = newName

 	container.NetworkSettings.IsAnonymousEndpoint = false

 	defer func() {
 		if err != nil {
 			container.Name = oldName

 			container.NetworkSettings.IsAnonymousEndpoint = oldIsAnonymousEndpoint

 			daemon.reserveName(container.ID, oldName)

 			for k, v := range links {

 				daemon.containersReplica.ReserveName(oldName+k, v.ID)

 				daemon.linkIndex.link(container, v, oldName+k)
 				daemon.linkIndex.unlink(newName+k, v, container)

 				daemon.containersReplica.ReleaseName(newName + k)

 			}

 			daemon.releaseName(newName)

 		}
 	}()

 	for k, v := range links {
 		daemon.linkIndex.unlink(oldName+k, v, container)

 		daemon.containersReplica.ReleaseName(oldName + k)

 	}

 	daemon.releaseName(oldName)

 	if err = container.CheckpointTo(daemon.containersReplica); err != nil {

 		return err
 	}
 

 	attributes := map[string]string{
 		"oldName": oldName,
 	}
 

 	if !container.Running {

 		daemon.LogContainerEventWithAttributes(container, "rename", attributes)

 		return nil
 	}
 
 	defer func() {
 		if err != nil {
 			container.Name = oldName

 			container.NetworkSettings.IsAnonymousEndpoint = oldIsAnonymousEndpoint

 			if e := container.CheckpointTo(daemon.containersReplica); e != nil {

 				logrus.Errorf("%s: Failed in writing to Disk on rename failure: %v", container.ID, e)
 			}
 		}
 	}()
 
 	sid = container.NetworkSettings.SandboxID

 	if sid != "" && daemon.netController != nil {

 		sb, err = daemon.netController.SandboxByID(sid)
 		if err != nil {
 			return err
 		}

 		err = sb.Rename(strings.TrimPrefix(container.Name, "/"))
 		if err != nil {
 			return err
 		}

 	}

 
 	daemon.LogContainerEventWithAttributes(container, "rename", attributes)

 	return nil

 }