From c311e94d3d1f19924ac77d197c616782b497f908 Mon Sep 17 00:00:00 2001
From: git-harry <git-harry@live.co.uk>
Date: Fri, 7 Feb 2014 13:37:59 +0000
Subject: [PATCH] lvm: unhandled exception when migrating volume

Catches the StopIteration exception if the destination volume group
does not exist when attempting to migrate a volume.

Change-Id: I0b5dd15e4c7198fe54abf1aa917a60554adcd568
Closes-Bug:  #1277512
---
 cinder/tests/test_volume.py  | 23 +++++++++++++++++++++++
 cinder/volume/drivers/lvm.py |  4 ++--
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/cinder/tests/test_volume.py b/cinder/tests/test_volume.py
index caeea99bd..990181101 100644
--- a/cinder/tests/test_volume.py
+++ b/cinder/tests/test_volume.py
@@ -2685,6 +2685,29 @@ class LVMISCSIVolumeDriverTestCase(DriverTestCase):
         self.assertEqual(moved, False)
         self.assertIsNone(model_update)
 
+    def test_lvm_volume_group_missing(self):
+        hostname = socket.gethostname()
+        capabilities = {'location_info': 'LVMVolumeDriver:%s:'
+                        'cinder-volumes-3:default:0' % hostname}
+        host = {'capabilities': capabilities}
+        vol = {'name': 'test', 'id': 1, 'size': 1, 'status': 'available'}
+
+        def get_all_volume_groups():
+            return [{'name': 'cinder-volumes-2'}]
+
+        self.stubs.Set(volutils, 'get_all_volume_groups',
+                       get_all_volume_groups)
+
+        self.volume.driver.vg = FakeBrickLVM('cinder-volumes',
+                                             False,
+                                             None,
+                                             'default')
+
+        moved, model_update = self.volume.driver.migrate_volume(self.context,
+                                                                vol, host)
+        self.assertEqual(moved, False)
+        self.assertIsNone(model_update)
+
     def test_lvm_migrate_volume_proceed(self):
         hostname = socket.gethostname()
         capabilities = {'location_info': 'LVMVolumeDriver:%s:'
diff --git a/cinder/volume/drivers/lvm.py b/cinder/volume/drivers/lvm.py
index 352185c86..2d2515a48 100644
--- a/cinder/volume/drivers/lvm.py
+++ b/cinder/volume/drivers/lvm.py
@@ -693,9 +693,9 @@ class LVMISCSIDriver(LVMVolumeDriver, driver.ISCSIDriver):
 
         if dest_vg != self.vg.vg_name:
             vg_list = volutils.get_all_volume_groups()
-            vg_dict = \
+            try:
                 (vg for vg in vg_list if vg['name'] == dest_vg).next()
-            if vg_dict is None:
+            except StopIteration:
                 message = ("Destination Volume Group %s does not exist" %
                            dest_vg)
                 LOG.error(_('%s'), message)
-- 
2.45.2