From 903574db90baef1deda2d480e3a8e7f7d1ccaf47 Mon Sep 17 00:00:00 2001
From: Krishna Srinivas <krishna@minio.io>
Date: Sat, 15 Oct 2016 18:50:56 +0530
Subject: [PATCH] copy-object: Do not use ETag of source as MD5 as it will not
 be MD5 if source was uploaded as multipart. (#2938)

fixes #2934
---
 cmd/object-handlers.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/cmd/object-handlers.go b/cmd/object-handlers.go
index 008bb199c..f12466ae0 100644
--- a/cmd/object-handlers.go
+++ b/cmd/object-handlers.go
@@ -368,8 +368,9 @@ func (api objectAPIHandlers) CopyObjectHandler(w http.ResponseWriter, r *http.Re
 	// Save other metadata if available.
 	metadata := objInfo.UserDefined
 
-	// Do not set `md5sum` as CopyObject will not keep the
-	// same md5sum as the source.
+	// Remove the etag from source metadata because if it was uploaded as a multipart object
+	// then its ETag will not be MD5sum of the object.
+	delete(metadata, "md5Sum")
 
 	sha256sum := ""
 	// Create the object.