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moby--moby/daemon/rename.go

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package daemon
import (
"fmt"
)
// 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 {
if oldName == "" || newName == "" {
return fmt.Errorf("usage: docker rename OLD_NAME NEW_NAME")
}
container, err := daemon.Get(oldName)
if err != nil {
return err
}
oldName = container.Name
container.Lock()
defer container.Unlock()
if newName, err = daemon.reserveName(container.ID, newName); err != nil {
return fmt.Errorf("Error when allocating new name: %s", err)
}
container.Name = newName
undo := func() {
container.Name = oldName
daemon.reserveName(container.ID, oldName)
daemon.containerGraphDB.Delete(newName)
}
if err := daemon.containerGraphDB.Delete(oldName); err != nil {
undo()
return fmt.Errorf("Failed to delete container %q: %v", oldName, err)
}
if err := container.toDisk(); err != nil {
undo()
return err
}
container.logEvent("rename")
return nil
}