fix edge cases

weed/server/volume_grpc_copy.go

@@ -214,6 +214,9 @@ func (vs *VolumeServer) CopyFile(req *volume_server_pb.CopyFileRequest, stream v
 			}
 		}
 		if fileName == "" {
+			if req.IgnoreSourceFileNotFound {
+				return nil
+			}
 			return fmt.Errorf("CopyFile not found ec volume id %d", req.VolumeId)
 		}
 	}

weed/server/volume_grpc_erasure_coding.go

@@ -200,9 +200,7 @@ func (vs *VolumeServer) VolumeEcShardsDelete(ctx context.Context, req *volume_se
 		if err := os.Remove(baseFilename + ".ecj"); err != nil {
 			return nil, err
 		}
-		if err := os.Remove(baseFilename + ".vif"); err != nil {
-			return nil, err
-		}
+		os.Remove(baseFilename + ".vif")
 	}
 
 	return &volume_server_pb.VolumeEcShardsDeleteResponse{}, nil