From 06cb4dfe8ffc50d0e325d210844ef0c2a978eac4 Mon Sep 17 00:00:00 2001
From: Mark McGranaghan <mmcgrana@gmail.com>
Date: Fri, 21 Sep 2012 09:08:19 -0700
Subject: [PATCH] spare some syscalls

---
 tool/renumber.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tool/renumber.go b/tool/renumber.go
index c62f756..6ae0321 100644
--- a/tool/renumber.go
+++ b/tool/renumber.go
@@ -53,6 +53,8 @@ func main() {
     for index, indexName := range indexNames {
         oldName := sourceMap[indexName]
         newName := fmt.Sprintf("%03d-%s.go", index+1, indexName)
-        os.Rename(oldName, newName)
+        if oldName != newName {
+            os.Rename(oldName, newName)
+        }
     }
 }