[#14] Use the Put method to update if the kludge flag is set

Signed-off-by: Aleksey Kravchenko <al.kravchenko@yadro.com>

backend/frostfs/frostfs.go

@@ -684,10 +684,36 @@ func fillHeaders(ctx context.Context, filePath string, src fs.ObjectInfo, option
 	return headers
 }
 
+func (o *Object) updateWithPutImpl(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) error {
+	obj, err := o.fs.Put(ctx, in, src, options...)
+	if err != nil {
+		return err
+	}
+
+	objInfo, ok := obj.(*Object)
+	if !ok {
+		return fmt.Errorf("invalid object type")
+	}
+
+	o.filePath = objInfo.filePath
+	o.remote = objInfo.remote
+	o.name = objInfo.name
+	o.timestamp = objInfo.timestamp
+	o.Object = objInfo.Object
+
+	return nil
+}
+
 // Update the Object from in with modTime and size
 func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) error {
 	// When updating an object, the path to it should not change.
 	src = robject.NewStaticObjectInfo(o.Remote(), src.ModTime(ctx), src.Size(), src.Storable(), nil, src.Fs())
+	if o.fs.storeFilePathInFileNameAttr() {
+		// If the flag "kludge14" is set, the Put method should be used to update,
+		// as there is no Patch method in earlier versions of FrostFS.
+		return o.updateWithPutImpl(ctx, in, src, options...)
+	}
+
 	rootDirName, containerPath := bucket.Split(filepath.Join(o.fs.root, src.Remote()))
 	var cnrID cid.ID
 	var err error