package client
 
 import (
 	"net/url"
 	"strconv"
 
 	"github.com/docker/docker/api/types/swarm"
 	"golang.org/x/net/context"
 )
 

 // ConfigUpdate attempts to update a Config

 func (cli *Client) ConfigUpdate(ctx context.Context, id string, version swarm.Version, config swarm.ConfigSpec) error {

 	if err := cli.NewVersionError("1.30", "config update"); err != nil {
 		return err
 	}

 	query := url.Values{}
 	query.Set("version", strconv.FormatUint(version.Index, 10))
 	resp, err := cli.post(ctx, "/configs/"+id+"/update", query, config, nil)
 	ensureReaderClosed(resp)
 	return err
 }