From 0ed77a4f7309e8391510e34a9f5ad86413f50412 Mon Sep 17 00:00:00 2001
From: Jon Bernard <jobernar@redhat.com>
Date: Fri, 6 Mar 2015 15:26:19 -0500
Subject: [PATCH] Fix retype return value in volume driver base class

Instead of raising an exception, the expected behaviour is to return
a tuple indicating that the driver does not support retype operation.

Closes-Bug: #1430605

Change-Id: I395dfc3213bb560767ac3fc95e5d68c4a87a7640
---
 cinder/volume/driver.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/cinder/volume/driver.py b/cinder/volume/driver.py
index ea0afe8c4..228badb36 100644
--- a/cinder/volume/driver.py
+++ b/cinder/volume/driver.py
@@ -1101,8 +1101,7 @@ class VolumeDriver(ConsistencyGroupVD, TransferVD, ManageableVD, ExtendVD,
         raise NotImplementedError(msg)
 
     def retype(self, context, volume, new_type, diff, host):
-        msg = _("Retype existing volume not implemented.")
-        raise NotImplementedError(msg)
+        return False, None
 
     def reenable_replication(self, context, volume):
         msg = _("sync_replica not implemented.")
-- 
2.45.2