del backup file before backup file

pkg/app/raspberryChan.go

@@ -134,6 +134,11 @@ func backup() error {
 		BityuanFlag.Flag  = false
 		return errors.New("bty is running")
 	}
+	err = deleteBackup()
+	if err != nil && err != errors.New("backup file not exists"){
+		BityuanFlag.Flag = false
+		return err
+	}
 	err = SafeBackup()
 	if err != nil {
 		return err
@@ -198,11 +203,7 @@ func recoverNode() error {
 }
 
 func deleteBackup() error {
-	btyPath := GetAbsPath(setting.BityuanSetting.Name)
-	if btyPath == "" {
-		tlog.Error("btyPath empty","err","node not exists")
-		return errors.New("node not exists")
-	}
+
 	backupPath := btyPath + "/datadir_backup"
 	if _,err := os.Stat(backupPath);err != nil {
 		if os.IsNotExist(err) {
@@ -229,6 +230,7 @@ func MakeSureBtyIsNotRun() bool {
 		if info == "" {
 			return false
 		}
+		time.Sleep(time.Second*1)
 	}
 	return true
 }
\ No newline at end of file