add err

pkg/app/process.go

@@ -598,8 +598,10 @@ func AutoUpdatePai() error {
 	if err != nil {
 		return err
 	}
+	var serr bytes.Buffer
 	//解压缩文件
 	tar := exec.Command("tar","-xvf",name,"-C","../")
+	tar.Stdout = &serr
 	err = tar.Start()
 	if err != nil {
 		tlog.Error("tar","err",err)
@@ -607,7 +609,7 @@ func AutoUpdatePai() error {
 	}
 	err = tar.Wait()
 	if err != nil {
-		tlog.Error("tar","err",err)
+		tlog.Error("tar2","err",serr.String())
 		return err
 	}
 	remove := exec.Command("rm","-rf",name)