退出代码在ContainerState结构中。它嵌入在来自(*Client).ContainerInspect()的响应中的State字段中。
例如：

func checkExitStatus(ctx context.Context, client *client.Client, containerID string) error {
  inspection, err := client.ContainerInspect(ctx, containerID)
  if err != nil {
    return err
  }

  // Possible values are listed in the `ContainerState` docs; there do not
  // seem to be named constants for these values.
  if inspection.State.Status != "exited" {
    return errors.New("container is not exited")
  }

  if inspection.State.ExitCode != 0 {
    return fmt.Errorf("container exited with status %d", inspection.State.ExitCode)
  }

  return nil
}