Reference: bsc#947288
Subject: storage: remove cow as supported format
From: Charles Arnold carnold@suse.com Tue Sep 29 11:25:34 2015 -0600
Date: Tue Sep 29 16:33:16 2015 -0400:
Git: f30975c3f8e2c009d778f143633c37c5656207f5

Support for this format was removed about a year ago from
qemu with this commit,

commit 550830f9351291c585c963204ad9127998b1c1ce
Author: Stefan Hajnoczi <stefanha@redhat.com>
Date:   Tue Sep 16 15:24:24 2014 +0100

    block: delete cow block driver

Signed-off-by: Charles Arnold <carnold@suse.com>

Index: virt-manager-1.2.1/virtinst/storage.py
===================================================================
--- virt-manager-1.2.1.orig/virtinst/storage.py
+++ virt-manager-1.2.1/virtinst/storage.py
@@ -542,7 +542,7 @@ class StorageVolume(_StorageObject):
     """
     Base class for building and installing libvirt storage volume xml
     """
-    ALL_FORMATS = ["raw", "bochs", "cloop", "cow", "dmg", "iso", "qcow",
+    ALL_FORMATS = ["raw", "bochs", "cloop", "dmg", "iso", "qcow",
                    "qcow2", "qed", "vmdk", "vpc", "fat", "vhd", "vdi"]
 
     @staticmethod
@@ -743,7 +743,7 @@ class StorageVolume(_StorageObject):
 
     def list_create_formats(self):
         if self._supports_format():
-            return ["raw", "cow", "qcow", "qcow2", "qed", "vmdk", "vpc", "vdi"]
+            return ["raw", "qcow", "qcow2", "qed", "vmdk", "vpc", "vdi"]
         return None