// syncNamespace orchestrates deletion of a Namespace and its associated content.
func syncNamespace(kubeClient client.Interface, versions *unversioned.APIVersions, namespace *api.Namespace) error {
	if namespace.DeletionTimestamp == nil {
		if namespace.Spec.Network != "" {

			net, err := kubeClient.Networks().Get(namespace.Spec.Network)
			if err != nil || net == nil {
				glog.Warningf("Network %s cann't be found", namespace.Spec.Network)
				newNamespace := api.Namespace{}
				newNamespace.ObjectMeta = namespace.ObjectMeta
				newNamespace.Spec = namespace.Spec
				newNamespace.Status = namespace.Status
				newNamespace.Status.Phase = api.NamespaceFailed
				_, err := kubeClient.Namespaces().Status(&newNamespace)
				if err != nil {
					return err
				}
			}
		}
		return nil
	}

	// multiple controllers may edit a namespace during termination
	// first get the latest state of the namespace before proceeding
	// if the namespace was deleted already, don't do anything
	namespace, err := kubeClient.Namespaces().Get(namespace.Name)
	if err != nil {
		if errors.IsNotFound(err) {
			return nil
		}
		return err
	}

	glog.V(4).Infof("Syncing namespace %s", namespace.Name)

	// ensure that the status is up to date on the namespace
	// if we get a not found error, we assume the namespace is truly gone
	namespace, err = retryOnConflictError(kubeClient, namespace, updateNamespaceStatusFunc)
	if err != nil {
		if errors.IsNotFound(err) {
			return nil
		}
		return err
	}

	// if the namespace is already finalized, delete it
	if finalized(namespace) {
		err = kubeClient.Namespaces().Delete(namespace.Name)
		if err != nil && !errors.IsNotFound(err) {
			return err
		}
		return nil
	}

	// there may still be content for us to remove
	estimate, err := deleteAllContent(kubeClient, versions, namespace.Name, *namespace.DeletionTimestamp)
	if err != nil {
		return err
	}
	if estimate > 0 {
		return &contentRemainingError{estimate}
	}

	// we have removed content, so mark it finalized by us
	result, err := retryOnConflictError(kubeClient, namespace, finalizeNamespaceFunc)
	if err != nil {
		return err
	}

	// now check if all finalizers have reported that we delete now
	if finalized(result) {
		err = kubeClient.Namespaces().Delete(namespace.Name)
		if err != nil && !errors.IsNotFound(err) {
			return err
		}
	}

	return nil
}