From 4ab18a3331a870d9617ec5fc763f227cf4110283 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Mon, 10 Oct 2011 15:21:19 +0200
Subject: [PATCH] Fix for bug #128 about the RENAME command.

---
 src/db.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/db.c b/src/db.c
index 7bfca543..9620b6e8 100644
--- a/src/db.c
+++ b/src/db.c
@@ -328,6 +328,7 @@ void shutdownCommand(redisClient *c) {
 
 void renameGenericCommand(redisClient *c, int nx) {
     robj *o;
+    time_t expire;
 
     /* To use the same key as src and dst is probably an error */
     if (sdscmp(c->argv[1]->ptr,c->argv[2]->ptr) == 0) {
@@ -339,16 +340,18 @@ void renameGenericCommand(redisClient *c, int nx) {
         return;
 
     incrRefCount(o);
+    expire = getExpire(c->db,c->argv[1]);
     if (lookupKeyWrite(c->db,c->argv[2]) != NULL) {
         if (nx) {
             decrRefCount(o);
             addReply(c,shared.czero);
             return;
         }
-        dbOverwrite(c->db,c->argv[2],o);
-    } else {
-        dbAdd(c->db,c->argv[2],o);
+        /* Overwrite: delete the old key before creating the new one with the same name. */
+        dbDelete(c->db,c->argv[2]);
     }
+    dbAdd(c->db,c->argv[2],o);
+    if (expire != -1) setExpire(c->db,c->argv[2],expire);
     dbDelete(c->db,c->argv[1]);
     signalModifiedKey(c->db,c->argv[1]);
     signalModifiedKey(c->db,c->argv[2]);