func resourceAwsAutoscalingGroupUpdate(d *schema.ResourceData, meta interface{}) error {
	autoscalingconn := meta.(*AWSClient).autoscalingconn

	opts := autoscaling.UpdateAutoScalingGroup{
		Name: d.Id(),
	}

	if d.HasChange("desired_capacity") {
		opts.DesiredCapacity = d.Get("desired_capacity").(int)
		opts.SetDesiredCapacity = true
	}

	if d.HasChange("min_size") {
		opts.MinSize = d.Get("min_size").(int)
		opts.SetMinSize = true
	}

	if d.HasChange("max_size") {
		opts.MaxSize = d.Get("max_size").(int)
		opts.SetMaxSize = true
	}

	log.Printf("[DEBUG] AutoScaling Group update configuration: %#v", opts)
	_, err := autoscalingconn.UpdateAutoScalingGroup(&opts)
	if err != nil {
		d.Partial(true)
		return fmt.Errorf("Error updating Autoscaling group: %s", err)
	}

	return resourceAwsAutoscalingGroupRead(d, meta)
}
func resource_aws_autoscaling_group_update(
	s *terraform.ResourceState,
	d *terraform.ResourceDiff,
	meta interface{}) (*terraform.ResourceState, error) {
	p := meta.(*ResourceProvider)
	autoscalingconn := p.autoscalingconn
	rs := s.MergeDiff(d)

	opts := autoscaling.UpdateAutoScalingGroup{
		Name: rs.ID,
	}

	var err error

	if _, ok := d.Attributes["min_size"]; ok {
		opts.MinSize, err = strconv.Atoi(rs.Attributes["min_size"])
		opts.SetMinSize = true
	}

	if _, ok := d.Attributes["max_size"]; ok {
		opts.MaxSize, err = strconv.Atoi(rs.Attributes["max_size"])
		opts.SetMaxSize = true
	}

	if err != nil {
		return s, fmt.Errorf("Error parsing configuration: %s", err)
	}

	log.Printf("[DEBUG] AutoScaling Group update configuration: %#v", opts)

	_, err = autoscalingconn.UpdateAutoScalingGroup(&opts)

	if err != nil {
		return rs, fmt.Errorf("Error updating AutoScaling group: %s", err)
	}

	g, err := resource_aws_autoscaling_group_retrieve(rs.ID, autoscalingconn)

	if err != nil {
		return rs, err
	}

	return resource_aws_autoscaling_group_update_state(rs, g)
}