InUse(ctx context.Context) (bool, error)
}

const probeObject = "probeobject"

// checkWarmBackend checks if tier config credentials have sufficient privileges
// to perform all operations defined in the WarmBackend interface.
func checkWarmBackend(ctx context.Context, w WarmBackend) error {
	remoteVersionID, err := w.Put(ctx, probeObject, strings.NewReader("MinIO"), 5)
	if err != nil {

		versionsCount int
		toDel         []expireObjInfo
		failed        bool
		done          bool
	)
	deleteMarkerCountMap := map[string]int64{}
	pushToExpire := func() {
		// set preObject deleteMarkerCount
		if len(toDel) > 0 {
			lastDelIndex := len(toDel) - 1
			lastDel := toDel[lastDelIndex]
			if lastDel.ExpireAll {
				toDel[lastDelIndex].DeleteMarkerCount = deleteMarkerCountMap[lastDel.Name]