openstack/nova
Code Issues Proposed changes

Fix BDM legacy usage with objects

Browse Source 
When we're doing an upgrade against Havana, our backleveled
compute RPC version will cause us to run block_device.legacy_mapping(),
which attempts to convert a BlockDeviceMapping object into an old-
style dict. This trips over a common problem with objects where
things expecting a list or a dict decide the object is a dict and
try to iterate it as such.

This makes the small tweak necessary and adds a test that verifies
that it works.

Change-Id: I98fe496720ad1c4fce44c0c7fea8bfa1c2721812
This commit is contained in:
Dan Smith
2014-03-06 12:46:11 -08:00
parent bb0445fa92
commit 31a4ffc49c
2 changed files with 14 additions and 1 deletions
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2
nova/block_device.py
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@@ -86,7 +86,7 @@ class BlockDeviceDict(dict):
self.update(
dict((field, None)
for field in self._fields - do_not_default))
self.update(bdm_dict)
self.update(list(bdm_dict.iteritems()))
def _validate(self, bdm_dict):
"""Basic data format validations."""

13
nova/tests/test_block_device.py
View File

@@ -423,6 +423,19 @@ class TestBlockDeviceDict(test.NoDBTestCase):
for legacy, expected in zip(got_legacy, self.legacy_mapping):
self.assertThat(expected, matchers.IsSubDictOf(legacy))
def test_legacy_mapping_from_object_list(self):
bdm1 = block_device_obj.BlockDeviceMapping()
bdm1 = block_device_obj.BlockDeviceMapping._from_db_object(
None, bdm1, fake_block_device.FakeDbBlockDeviceDict(
self.new_mapping[0]))
bdm2 = block_device_obj.BlockDeviceMapping()
bdm2 = block_device_obj.BlockDeviceMapping._from_db_object(
None, bdm2, fake_block_device.FakeDbBlockDeviceDict(
self.new_mapping[1]))
bdmlist = block_device_obj.BlockDeviceMappingList()
bdmlist.objects = [bdm1, bdm2]
block_device.legacy_mapping(bdmlist)
def test_image_mapping(self):
removed_fields = ['id', 'instance_uuid', 'connection_info',
'device_name', 'created_at', 'updated_at',