rbd: discard not found error from GetMetadata

During ResyncVolume call, discard not found
error from GetMetadata API. If the image gets
resynced the local image creation time will be
lost, if the key is not present in the image
metadata then we can assume that the image is
already resynced.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

internal/csi-addons/rbd/replication.go

@@ -513,6 +513,7 @@ func (rs *ReplicationServer) DemoteVolume(ctx context.Context,
 		// store the image creation time for resync
 		_, err = rbdVol.GetMetadata(imageCreationTimeKey)
 		if err != nil && errors.Is(err, librbd.ErrNotFound) {
+			log.DebugLog(ctx, "setting image creation time %s for %s", creationTime, rbdVol)
 			err = rbdVol.SetMetadata(imageCreationTimeKey, timestampToString(creationTime))
 		}
 		if err != nil {
@@ -670,25 +671,29 @@ func (rs *ReplicationServer) ResyncVolume(ctx context.Context,
 
 	// image creation time is stored in the image metadata. it looks like
 	// `"seconds:1692879841 nanos:631526669"`
+	// If the image gets resynced the local image creation time will be
+	// lost, if the keys is not present in the image metadata then we can
+	// assume that the image is already resynced.
 	savedImageTime, err := rbdVol.GetMetadata(imageCreationTimeKey)
-	if err != nil {
+	if err != nil && !errors.Is(err, librbd.ErrNotFound) {
 		return nil, status.Errorf(codes.Internal,
 			"failed to get %s key from image metadata for %s: %s",
 			imageCreationTimeKey,
 			rbdVol,
 			err.Error())
 	}
 
-	st, err := timestampFromString(savedImageTime)
-	if err != nil {
-		return nil, status.Errorf(codes.Internal, "failed to parse image creation time: %s", err.Error())
-	}
-	log.DebugLog(ctx, "image %s, savedImageTime=%v, currentImageTime=%v", rbdVol, st, creationTime.AsTime())
-
-	if req.Force && st.Equal(creationTime.AsTime()) {
-		err = rbdVol.ResyncVol(localStatus)
-		if err != nil {
-			return nil, getGRPCError(err)
+	if savedImageTime != "" {
+		st, sErr := timestampFromString(savedImageTime)
+		if sErr != nil {
+			return nil, status.Errorf(codes.Internal, "failed to parse image creation time: %s", sErr.Error())
+		}
+		log.DebugLog(ctx, "image %s, savedImageTime=%v, currentImageTime=%v", rbdVol, st, creationTime.AsTime())
+		if req.Force && st.Equal(creationTime.AsTime()) {
+			err = rbdVol.ResyncVol(localStatus)
+			if err != nil {
+				return nil, getGRPCError(err)
+			}
 		}
 	}