Fix device_type=lun with boot_index

Right now we'll fail to calculate the boot order of a set of BDMs if
one of them is a device_type=lun. This fixes that and teaches us
that it's just a "hd" from qemu's perspective.

Closes-Bug: #2065084
Change-Id: Ic1340918738d503fc797c9373fe2e1dd16b27a09

nova/tests/unit/virt/libvirt/test_blockinfo.py

@@ -1372,6 +1372,20 @@ class LibvirtBlockInfoTest(test.NoDBTestCase):
         expected_order = ['hd', 'cdrom']
         self.assertEqual(expected_order, blockinfo.get_boot_order(disk_info))
 
+    def test_get_boot_order_lun(self):
+        disk_info = {
+            'disk_bus': 'virtio',
+            'cdrom_bus': 'ide',
+            'mapping': {
+            'disk': {'bus': 'virtio', 'dev': 'vda',
+                     'type': 'disk', 'boot_index': '1'},
+            'root': {'bus': 'virtio', 'dev': 'vda',
+                     'type': 'lun', 'boot_index': '1'},
+            }
+        }
+        expected_order = ['hd']
+        self.assertEqual(expected_order, blockinfo.get_boot_order(disk_info))
+
     def _get_rescue_image_meta(self, props_dict):
         meta_dict = dict(self.test_image_meta)
         meta_dict['properties'] = props_dict

nova/virt/libvirt/blockinfo.py

@@ -88,7 +88,8 @@ from nova.virt import osinfo
 
 CONF = cfg.CONF
 
-BOOT_DEV_FOR_TYPE = {'disk': 'hd', 'cdrom': 'cdrom', 'floppy': 'fd'}
+BOOT_DEV_FOR_TYPE = {'disk': 'hd', 'cdrom': 'cdrom', 'floppy': 'fd',
+                     'lun': 'hd'}
 # NOTE(aspiers): If you change this, don't forget to update the docs and
 # metadata for hw_*_bus in glance.
 SUPPORTED_DEVICE_BUSES = {