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
}
// resetContainer resets the container's IO and ensures that the command is able to be executed again
// by copying the data into a new struct
// if lock is true, then container locked during reset
func (m *containerMonitor) resetContainer(lock bool) {
container := m.container
if lock {
container.Lock()
defer container.Unlock()
}
if err := container.CloseStreams(); err != nil {
logrus.Errorf("%s: %s", container.ID, err)
}
if container.Command != nil && container.Command.ProcessConfig.Terminal != nil {
if err := container.Command.ProcessConfig.Terminal.Close(); err != nil {
logrus.Errorf("%s: Error closing terminal: %s", container.ID, err)
}
}
// Re-create a brand new stdin pipe once the container exited
if container.Config.OpenStdin {
container.NewInputPipes()
}
if container.LogDriver != nil {
if container.LogCopier != nil {
exit := make(chan struct{})
go func() {
container.LogCopier.Wait()
close(exit)
}()
select {
case <-time.After(loggerCloseTimeout):
logrus.Warnf("Logger didn't exit in time: logs may be truncated")
container.LogCopier.Close()
// always waits for the LogCopier to finished before closing
<-exit
case <-exit:
}
}
container.LogDriver.Close()
container.LogCopier = nil
container.LogDriver = nil
}
c := container.Command.ProcessConfig.Cmd
container.Command.ProcessConfig.Cmd = exec.Cmd{
Stdin: c.Stdin,
Stdout: c.Stdout,
Stderr: c.Stderr,
Path: c.Path,
Env: c.Env,
ExtraFiles: c.ExtraFiles,
Args: c.Args,
Dir: c.Dir,
SysProcAttr: c.SysProcAttr,
}
}
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 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 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.containerd.UpdateResources(container.ID, toContainerdResources(hostConfig.Resources)); err != nil {
restoreConfig = true
return errCannotUpdate(container.ID, err)
}
}
daemon.LogContainerEvent(container, "update")
return nil
}