From 16a5e8e13bab70f7951195cda556b629ae9cab7e Mon Sep 17 00:00:00 2001
From: Kejie Zhang <kejie.zhang@hyperchain.cn>
Date: Thu, 6 Sep 2018 12:42:24 +0800
Subject: [PATCH] drop external dep and update copy function

---
 daghelpers.go | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/daghelpers.go b/daghelpers.go
index 6536bb7..8219306 100644
--- a/daghelpers.go
+++ b/daghelpers.go
@@ -95,13 +95,6 @@ func Copy(ctx context.Context, from, to DAGService, root *cid.Cid) error {
 		return err
 	}
 	links := node.Links()
-	if len(links) == 0 {
-		err := to.Add(ctx, node)
-		if err != nil {
-			return err
-		}
-		return nil
-	}
 	for _, link := range links {
 		err := Copy(ctx, from, to, link.Cid)
 		if err != nil {