reorder

file.go

@@ -86,12 +86,15 @@ func (f *File) Do(CmdTimeout time.Duration) (string, error) {
 	}
 	f.owner.log.Info("DO: ", f.Cmd)
 	done := make(chan string, 1)
-	go func() {
-
 	var b bytes.Buffer
 	cmd.Stdout = &b
 	cmd.Stderr = &b
-		cmd.Start()
+	err := cmd.Start()
+	if err != nil {
+		f.owner.log.Error("cmd start error: ", err)
+		panic(err)
+	}
+	go func() {
 		f.pid = cmd.Process.Pid
 		cmd.Wait()
 		done <- b.String()