func convertRestartPolicy(restart string, source *composetypes.RestartPolicy) (*swarm.RestartPolicy, error) {
	// TODO: log if restart is being ignored
	if source == nil {
		policy, err := runconfigopts.ParseRestartPolicy(restart)
		if err != nil {
			return nil, err
		}
		switch {
		case policy.IsNone():
			return nil, nil
		case policy.IsAlways(), policy.IsUnlessStopped():
			return &swarm.RestartPolicy{
				Condition: swarm.RestartPolicyConditionAny,
			}, nil
		case policy.IsOnFailure():
			attempts := uint64(policy.MaximumRetryCount)
			return &swarm.RestartPolicy{
				Condition:   swarm.RestartPolicyConditionOnFailure,
				MaxAttempts: &attempts,
			}, nil
		default:
			return nil, fmt.Errorf("unknown restart policy: %s", restart)
		}
	}
	return &swarm.RestartPolicy{
		Condition:   swarm.RestartPolicyCondition(source.Condition),
		Delay:       source.Delay,
		MaxAttempts: source.MaxAttempts,
		Window:      source.Window,
	}, nil
}

func (r *restartPolicyOptions) ToRestartPolicy() *swarm.RestartPolicy {
	return &swarm.RestartPolicy{
		Condition:   swarm.RestartPolicyCondition(r.condition),
		Delay:       r.delay.Value(),
		MaxAttempts: r.maxAttempts.Value(),
		Window:      r.window.Value(),
	}
}

func restartPolicyFromGRPC(p *swarmapi.RestartPolicy) *types.RestartPolicy {
	var rp *types.RestartPolicy
	if p != nil {
		rp = &types.RestartPolicy{}
		rp.Condition = types.RestartPolicyCondition(strings.ToLower(p.Condition.String()))
		if p.Delay != nil {
			delay, _ := ptypes.Duration(p.Delay)
			rp.Delay = &delay
		}
		if p.Window != nil {
			window, _ := ptypes.Duration(p.Window)
			rp.Window = &window
		}

		rp.MaxAttempts = &p.MaxAttempts
	}
	return rp
}