adjust modification detection logic

weed/server/filer_grpc_server_remote.go

@@ -153,7 +153,7 @@ func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.Downlo
 	newEntry := entry.ShallowClone()
 	newEntry.Chunks = chunks
 	newEntry.Remote = proto.Clone(entry.Remote).(*filer_pb.RemoteEntry)
-	newEntry.Remote.LocalMtime = time.Now().Unix()
+	newEntry.Remote.LocalMtime = entry.Mtime.Unix()
 
 	// this skips meta data log events
 

weed/shell/command_remote_cache.go

@@ -118,7 +118,7 @@ func shouldCacheToLocal(entry *filer_pb.Entry) bool {
 	if entry.RemoteEntry == nil {
 		return false
 	}
-	if entry.RemoteEntry.LocalMtime == 0 && entry.RemoteEntry.RemoteSize > 0 {
+	if entry.RemoteEntry.LocalMtime < entry.Attributes.Mtime && entry.RemoteEntry.RemoteSize > 0 {
 		return true
 	}
 	return false