db migration completely fails on sqlalchemy-migrate 0.6

[Mark Washenberger]

Looks like the version checking code doesn't handle older versions of sqlalchemy migrate, where the migrate module lacks a __version__ attribute.

root@z4-api1:~# nova-manage db sync
Command failed, please check log for more info
2012-03-22 17:42:06 CRITICAL nova [-] 'module' object has no attribute '__version__'
(nova): TRACE: Traceback (most recent call last):
(nova): TRACE: File "/usr/bin/nova-manage", line 1791, in <module>
(nova): TRACE: main()
(nova): TRACE: File "/usr/bin/nova-manage", line 1778, in main
(nova): TRACE: fn(*fn_args, **fn_kwargs)
(nova): TRACE: File "/usr/bin/nova-manage", line 1097, in sync
(nova): TRACE: return migration.db_sync(version)
(nova): TRACE: File "/usr/lib/python2.6/dist-packages/nova/db/migration.py", line 30, in db_sync
(nova): TRACE: return IMPL.db_sync(version=version)
(nova): TRACE: File "/usr/lib/python2.6/dist-packages/nova/utils.py", line 662, in __getattr__
(nova): TRACE: backend = self.__get_backend()
(nova): TRACE: File "/usr/lib/python2.6/dist-packages/nova/utils.py", line 657, in __get_backend
(nova): TRACE: self.__backend = __import__(name, None, None, fromlist)
(nova): TRACE: File "/usr/lib/python2.6/dist-packages/nova/db/sqlalchemy/migration.py", line 32, in <module>
(nova): TRACE: MIGRATE_PKG_VER = dist_version.StrictVersion(migrate.__version__)
(nova): TRACE: AttributeError: 'module' object has no attribute '__version__'
(nova): TRACE:

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/5716

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/5716
Committed: http://github.com/openstack/nova/commit/164fb0cd52f00dafb506952374168ce20309a5ea
Submitter: Jenkins
Branch: master

commit 164fb0cd52f00dafb506952374168ce20309a5ea
Author: Mark Washenberger <email address hidden>
Date: Thu Mar 22 18:21:00 2012 -0400

    Assume migrate module missing __version__ is old

    Fixes bug 962592

    Change-Id: I9675b99df89d4f2d47e0a2fbfd13147fa1c7aeb7