// needed. No error if user(s) already are in the group.
func (sys *IAMSys) AddUsersToGroup(ctx context.Context, group string, members []string) (updatedAt time.Time, err error) {
	if !sys.Initialized() {
		return updatedAt, errServerNotInitialized
	}

	updatedAt, err = sys.store.AddUsersToGroup(ctx, group, members)
	if err != nil {
		return updatedAt, err
	}

	sys.notifyForGroup(ctx, group)
	return updatedAt, nil

					continue
				}
				mergeCh <- append(grid.GetByteBuffer()[:0], buf.Bytes()...)
			case <-ctx.Done():
				grid.PutByteBuffer(buf.Bytes())
				return
			}
		}
	}()
	peers, _ := newPeerRestClients(globalEndpoints)
	err := globalHTTPListen.Subscribe(mask, localCh, ctx.Done(), func(ev event.Event) bool {
		if ev.S3.Bucket.Name != "" && bucketName != "" {
			if ev.S3.Bucket.Name != bucketName {

	case storageclass.STANDARD, storageclass.RRS:
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, errTierReservedName), r.URL)
		return
	}

	// Refresh from the disk in case we had missed notifications about edits from peers.
	if err := globalTierConfigMgr.Reload(ctx, objAPI); err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	err = globalTierConfigMgr.Add(ctx, cfg, ignoreInUse)

	// yet set any policy
	uClient := s.getUserClient(c, accessKey, secretKey, "")
	c.mustNotListObjects(ctx, uClient, bucket)

	err = s.adm.UpdateGroupMembers(ctx, madmin.GroupAddRemove{
		Group:   "test-group",
		Members: []string{accessKey},
	})
	if err != nil {
		c.Fatalf("unable to add user to group: %v", err)
	}

	err = s.adm.SetPolicy(ctx, policy, "test-group", true)
	if err != nil {

		return defaultMeta, nil
	}

	// Copy is default behavior if not x-amz-metadata-directive is set.
	return defaultMeta, nil
}

// getRemoteInstanceTransport contains a roundtripper for external (not peers) servers
var remoteInstanceTransport atomic.Value

func setRemoteInstanceTransport(tr http.RoundTripper) {
	remoteInstanceTransport.Store(tr)
}

func getRemoteInstanceTransport() http.RoundTripper {

		})
	}
	if err != nil {
		return errSRServiceAccount(fmt.Errorf("unable to create service account on %s: %v", ourName, err))
	}

	peers := make(map[string]madmin.PeerInfo, len(arg.Peers))
	for dID, pi := range arg.Peers {
		if c.state.Peers != nil {
			if existingPeer, ok := c.state.Peers[dID]; ok {
				// retain existing ReplicateILMExpiry of peer if its already set
				// and incoming arg has it false. it could be default false

type GroupInfo struct {
	Version   int       `json:"version"`
	Status    string    `json:"status"`
	Members   []string  `json:"members"`
	UpdatedAt time.Time `json:"updatedAt,omitempty"`
}

func newGroupInfo(members []string) GroupInfo {
	return GroupInfo{Version: 1, Status: statusEnabled, Members: members, UpdatedAt: UTCNow()}
}

// MappedPolicy represents a policy name mapped to a user or group

func newPeerS3Clients(endpoints EndpointServerPools) (peers []peerS3Client) {
	nodes := endpoints.GetNodes()
	peers = make([]peerS3Client, len(nodes))
	for i, node := range nodes {
		if node.IsLocal {
			peers[i] = &localPeerS3Client{node: node}
		} else {
			peers[i] = newPeerS3Client(node)
		}
		peers[i].SetPools(node.Pools)
	}

	return peers
}

// Returns a peer S3 client.

		StatusCode: http.StatusBadRequest,
	}
)

const (
	tierConfigFile    = "tier-config.bin"
	tierConfigFormat  = 1
	tierConfigV1      = 1
	tierConfigVersion = 2
)

// tierConfigPath refers to remote tier config object name
var tierConfigPath = path.Join(minioConfigPrefix, tierConfigFile)

const tierCfgRefreshAtHdr = "X-MinIO-TierCfg-RefreshedAt"

	host, err := xnet.ParseHost(serverAddr)
	if err != nil {
		return config.ErrInvalidAddressFlag(err)
	}

	// 0.0.0.0 is a wildcard address and refers to local network
	// addresses. I.e, 0.0.0.0:9000 like ":9000" refers to port
	// 9000 on localhost.
	if host.Name != "" && host.Name != net.IPv4zero.String() && host.Name != net.IPv6zero.String() {