github.com/noxiouz/docker@v0.7.3-0.20160629055221-3d231c78e8c5/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  	if newName[0] != '/' {
    25  		newName = "/" + newName
    26  	}
    27  
    28  	container, err := daemon.GetContainer(oldName)
    29  	if err != nil {
    30  		return err
    31  	}
    32  
    33  	oldName = container.Name
    34  	oldIsAnonymousEndpoint := container.NetworkSettings.IsAnonymousEndpoint
    35  
    36  	if oldName == newName {
    37  		return fmt.Errorf("Renaming a container with the same name as its current name")
    38  	}
    39  
    40  	container.Lock()
    41  	defer container.Unlock()
    42  
    43  	if newName, err = daemon.reserveName(container.ID, newName); err != nil {
    44  		return fmt.Errorf("Error when allocating new name: %v", err)
    45  	}
    46  
    47  	container.Name = newName
    48  	container.NetworkSettings.IsAnonymousEndpoint = false
    49  
    50  	defer func() {
    51  		if err != nil {
    52  			container.Name = oldName
    53  			container.NetworkSettings.IsAnonymousEndpoint = oldIsAnonymousEndpoint
    54  			daemon.reserveName(container.ID, oldName)
    55  			daemon.releaseName(newName)
    56  		}
    57  	}()
    58  
    59  	daemon.releaseName(oldName)
    60  	if err = container.ToDisk(); err != nil {
    61  		return err
    62  	}
    63  
    64  	attributes := map[string]string{
    65  		"oldName": oldName,
    66  	}
    67  
    68  	if !container.Running {
    69  		daemon.LogContainerEventWithAttributes(container, "rename", attributes)
    70  		return nil
    71  	}
    72  
    73  	defer func() {
    74  		if err != nil {
    75  			container.Name = oldName
    76  			container.NetworkSettings.IsAnonymousEndpoint = oldIsAnonymousEndpoint
    77  			if e := container.ToDisk(); e != nil {
    78  				logrus.Errorf("%s: Failed in writing to Disk on rename failure: %v", container.ID, e)
    79  			}
    80  		}
    81  	}()
    82  
    83  	sid = container.NetworkSettings.SandboxID
    84  	if daemon.netController != nil {
    85  		sb, err = daemon.netController.SandboxByID(sid)
    86  		if err != nil {
    87  			return err
    88  		}
    89  
    90  		err = sb.Rename(strings.TrimPrefix(container.Name, "/"))
    91  		if err != nil {
    92  			return err
    93  		}
    94  	}
    95  
    96  	daemon.LogContainerEventWithAttributes(container, "rename", attributes)
    97  	return nil
    98  }