#1773

add comment

modules/repofiles/update.go

@@ -932,6 +932,10 @@ func moveAndAddFiles(oldTreePath, newTreePath string, t *TemporaryUploadReposito
 	stdOut := new(bytes.Buffer)
 	stdErr := new(bytes.Buffer)
 	stdIn := new(bytes.Buffer)
+	//write all files in stage format to the stdin,
+	//for each file,remove old tree path and add new tree path
+	//see the update-index help document at  https://git-scm.com/docs/git-update-index
+	//especially see the content of "USING --INDEX-INFO"
 	for _, v := range array {
 		if v == "" {
 			continue