github.com/uppal0016/docker_new@v0.0.0-20240123060250-1c98be13ac2c/daemon/rename.go (about)

     1  package daemon
     2  
     3  import (
     4  	"fmt"
     5  	"strings"
     6  
     7  	"github.com/Sirupsen/logrus"
     8  	"github.com/docker/libnetwork"
     9  )
    10  
    11  // ContainerRename changes the name of a container, using the oldName
    12  // to find the container. An error is returned if newName is already
    13  // reserved.
    14  func (daemon *Daemon) ContainerRename(oldName, newName string) error {
    15  	var (
    16  		sid string
    17  		sb  libnetwork.Sandbox
    18  	)
    19  
    20  	if oldName == "" || newName == "" {
    21  		return fmt.Errorf("Neither old nor new names may be empty")
    22  	}
    23  
    24  	container, err := daemon.GetContainer(oldName)
    25  	if err != nil {
    26  		return err
    27  	}
    28  
    29  	oldName = container.Name
    30  
    31  	container.Lock()
    32  	defer container.Unlock()
    33  	if newName, err = daemon.reserveName(container.ID, newName); err != nil {
    34  		return fmt.Errorf("Error when allocating new name: %v", err)
    35  	}
    36  
    37  	container.Name = newName
    38  
    39  	defer func() {
    40  		if err != nil {
    41  			container.Name = oldName
    42  			daemon.reserveName(container.ID, oldName)
    43  			daemon.releaseName(newName)
    44  		}
    45  	}()
    46  
    47  	daemon.releaseName(oldName)
    48  	if err = container.ToDisk(); err != nil {
    49  		return err
    50  	}
    51  
    52  	attributes := map[string]string{
    53  		"oldName": oldName,
    54  	}
    55  
    56  	if !container.Running {
    57  		daemon.LogContainerEventWithAttributes(container, "rename", attributes)
    58  		return nil
    59  	}
    60  
    61  	defer func() {
    62  		if err != nil {
    63  			container.Name = oldName
    64  			if e := container.ToDisk(); e != nil {
    65  				logrus.Errorf("%s: Failed in writing to Disk on rename failure: %v", container.ID, e)
    66  			}
    67  		}
    68  	}()
    69  
    70  	sid = container.NetworkSettings.SandboxID
    71  	if daemon.netController != nil {
    72  		sb, err = daemon.netController.SandboxByID(sid)
    73  		if err != nil {
    74  			return err
    75  		}
    76  
    77  		err = sb.Rename(strings.TrimPrefix(container.Name, "/"))
    78  		if err != nil {
    79  			return err
    80  		}
    81  	}
    82  
    83  	daemon.LogContainerEventWithAttributes(container, "rename", attributes)
    84  	return nil
    85  }