package daemon import ( "fmt" derr "github.com/docker/docker/errors" "github.com/docker/engine-api/types/container" ) // ContainerUpdate updates resources of the container func (daemon *Daemon) ContainerUpdate(name string, hostConfig *container.HostConfig) ([]string, error) { var warnings []string warnings, err := daemon.verifyContainerSettings(hostConfig, nil) 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 { 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 } if container.RemovalInProgress || container.Dead { errMsg := fmt.Errorf("Container is marked for removal and cannot be \"update\".") return derr.ErrorCodeCantUpdate.WithArgs(container.ID, errMsg) } if container.IsRunning() && hostConfig.KernelMemory != 0 { errMsg := fmt.Errorf("Can not update kernel memory to a running container, please stop it first.") return derr.ErrorCodeCantUpdate.WithArgs(container.ID, errMsg) } if err := container.UpdateContainer(hostConfig); err != nil { return derr.ErrorCodeCantUpdate.WithArgs(container.ID, err.Error()) } // 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() { if err := daemon.execDriver.Update(container.Command); err != nil { return derr.ErrorCodeCantUpdate.WithArgs(container.ID, err.Error()) } } daemon.LogContainerEvent(container, "update") return nil }