feat: add syncthing for clone mode (#270)

* feat: add syncthing for clone mode

---------

Co-authored-by: wencaiwulue <895703375@qq.com>

vendor/github.com/stretchr/objx/tests.go

@@ -0,0 +1,17 @@
+package objx
+
+// Has gets whether there is something at the specified selector
+// or not.
+//
+// If m is nil, Has will always return false.
+func (m Map) Has(selector string) bool {
+	if m == nil {
+		return false
+	}
+	return !m.Get(selector).IsNil()
+}
+
+// IsNil gets whether the data is nil or not.
+func (v *Value) IsNil() bool {
+	return v == nil || v.data == nil
+}