Add filemanager api

experimental/libbox/log.go

@@ -27,3 +27,27 @@ func RedirectStderr(path string) error {
 	stderrFile = outputFile
 	return nil
 }
+
+func RedirectStderrAsUser(path string, uid, gid int) error {
+	if stats, err := os.Stat(path); err == nil && stats.Size() > 0 {
+		_ = os.Rename(path, path+".old")
+	}
+	outputFile, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	err = outputFile.Chown(uid, gid)
+	if err != nil {
+		outputFile.Close()
+		os.Remove(outputFile.Name())
+		return err
+	}
+	err = unix.Dup2(int(outputFile.Fd()), int(os.Stderr.Fd()))
+	if err != nil {
+		outputFile.Close()
+		os.Remove(outputFile.Name())
+		return err
+	}
+	stderrFile = outputFile
+	return nil
+}