package daemon import ( "fmt" "time" "github.com/docker/engine-api/types/container" ) // ContainerUpdate updates configuration of the container func (daemon *Daemon) ContainerUpdate(name string, hostConfig *container.HostConfig) ([]string, error) { var warnings []string warnings, err := daemon.verifyContainerSettings(hostConfig, nil, true) if err != nil { return warnings, err } if err := daemon.update(name, hostConfig); err != nil { return warnings, err } return warnings, nil } // ContainerUpdateCmdOnBuild updates Path and Args for the container with ID cID. func (daemon *Daemon) ContainerUpdateCmdOnBuild(cID string, cmd []string) error { if len(cmd) == 0 { return nil } c, err := daemon.GetContainer(cID) if err != nil { return err } c.Path = cmd[0] c.Args = cmd[1:] return nil } func (daemon *Daemon) update(name string, hostConfig *container.HostConfig) error { if hostConfig == nil { return nil } container, err := daemon.GetContainer(name) if err != nil { return err } restoreConfig := false backupHostConfig := *container.HostConfig defer func() { if restoreConfig { container.Lock() container.HostConfig = &backupHostConfig container.ToDisk() container.Unlock() } }() if container.RemovalInProgress || container.Dead { return errCannotUpdate(container.ID, fmt.Errorf("Container is marked for removal and cannot be \"update\".")) } if container.IsRunning() && hostConfig.KernelMemory != 0 { return errCannotUpdate(container.ID, fmt.Errorf("Can not update kernel memory to a running container, please stop it first.")) } if err := container.UpdateContainer(hostConfig); err != nil { restoreConfig = true return errCannotUpdate(container.ID, err) } // if Restart Policy changed, we need to update container monitor container.UpdateMonitor(hostConfig.RestartPolicy) // if container is restarting, wait 5 seconds until it's running if container.IsRestarting() { container.WaitRunning(5 * time.Second) } // If container is not running, update hostConfig struct is enough, // resources will be updated when the container is started again. // If container is running (including paused), we need to update configs // to the real world. if container.IsRunning() && !container.IsRestarting() { if err := daemon.execDriver.Update(container.Command); err != nil { restoreConfig = true return errCannotUpdate(container.ID, err) } } daemon.LogContainerEvent(container, "update") return nil } func errCannotUpdate(containerID string, err error) error { return fmt.Errorf("Cannot update container %s: %v", containerID, err) }