From 117cbfe12fb32ce2040c88619f263335630624f6 Mon Sep 17 00:00:00 2001
From: Cole Robinson <crobinso@redhat.com>
Date: Wed, 10 Dec 2014 12:24:16 -0500
Subject: [PATCH] devicedisk: Don't set driver name=unknown for rbd vols

---
 tests/cli-test-xml/compare/virt-install-many-devices.xml | 2 +-
 virtinst/diskbackend.py                                  | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/cli-test-xml/compare/virt-install-many-devices.xml b/tests/cli-test-xml/compare/virt-install-many-devices.xml
index a1b9b6c9c..8bca4f782 100644
--- a/tests/cli-test-xml/compare/virt-install-many-devices.xml
+++ b/tests/cli-test-xml/compare/virt-install-many-devices.xml
@@ -72,7 +72,7 @@
       <target dev="vdf" bus="virtio"/>
     </disk>
     <disk type="volume" device="disk">
-      <driver name="qemu" type="unknown"/>
+      <driver name="qemu"/>
       <source volume="some-rbd-vol" pool="rbd-ceph"/>
       <target dev="vdg" bus="virtio"/>
     </disk>
diff --git a/virtinst/diskbackend.py b/virtinst/diskbackend.py
index 444b39ac1..864ad1ee7 100644
--- a/virtinst/diskbackend.py
+++ b/virtinst/diskbackend.py
@@ -552,7 +552,9 @@ class StorageBackend(_StorageBase):
 
     def get_driver_type(self):
         if self._vol_object:
-            return self.get_vol_xml().format
+            ret = self.get_vol_xml().format
+            if ret != "unknown":
+                return ret
         return None
 
     def validate(self, disk):