// updateGroups updates the group from the persistent store, and also related policy mapping if any.
func (store *IAMStoreSys) updateGroups(ctx context.Context, cache *iamCache) (res []string, err error) {
	groupSet := set.NewStringSet()
	if iamOS, ok := store.IAMStorageAPI.(*IAMObjectStore); ok {
		listedConfigItems, err := iamOS.listAllIAMConfigItems(ctx)
		if err != nil {
			return nil, err
		}

	accInfo, err := userAdmClient.AccountInfo(ctx, madmin.AccountOpts{})
	if err != nil {
		c.Fatalf("root user STS should be able to get account info: %v", err)
	}

	gotBuckets := set.NewStringSet()
	for _, b := range accInfo.Buckets {
		gotBuckets.Add(b.Name)
		if !b.Access.Read || !b.Access.Write {
			c.Fatalf("root user should have read and write access to bucket: %v", b.Name)
		}
	}