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[Bug 1408658] [NEW] migration 61 downgrade fails using mysql

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Public bug reported:


When trying to downgrade from version 61, it fails with an AttributeError.

$ keystone-manage db_sync 60
2015-01-08 08:29:56.494 CRITICAL keystone [-] AttributeError: 'MetaData' object has no attribute 'c'

2015-01-08 08:29:56.494 TRACE keystone Traceback (most recent call last):
2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/bin/keystone-manage", line 6, in <module>
2015-01-08 08:29:56.494 TRACE keystone     exec(compile(open(__file__).read(), __file__, 'exec'))
2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/bin/keystone-manage", line 44, in <module>
2015-01-08 08:29:56.494 TRACE keystone     cli.main(argv=sys.argv, config_files=config_files)
2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/cli.py", line 311, in main
2015-01-08 08:29:56.494 TRACE keystone     CONF.command.cmd_class.main()
2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/cli.py", line 74, in main
2015-01-08 08:29:56.494 TRACE keystone     migration_helpers.sync_database_to_version(extension, version)
2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/common/sql/migration_helpers.py", line 204, in sync_database_to_version
2015-01-08 08:29:56.494 TRACE keystone     _sync_common_repo(version)
2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/common/sql/migration_helpers.py", line 160, in _sync_common_repo
2015-01-08 08:29:56.494 TRACE keystone     init_version=init_version)
2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/oslo.db/oslo_db/sqlalchemy/migration.py", line 82, in db_sync
2015-01-08 08:29:56.494 TRACE keystone     version)
2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/api.py", line 202, in downgrade
2015-01-08 08:29:56.494 TRACE keystone     return _migrate(url, repository, version, upgrade=False, err=err, **opts)
2015-01-08 08:29:56.494 TRACE keystone   File "<string>", line 2, in _migrate
2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/util/__init__.py", line 160, in with_engine
2015-01-08 08:29:56.494 TRACE keystone     return f(*a, **kw)
2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/api.py", line 366, in _migrate
2015-01-08 08:29:56.494 TRACE keystone     schema.runchange(ver, change, changeset.step)
2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/schema.py", line 93, in runchange
2015-01-08 08:29:56.494 TRACE keystone     change.run(self.engine, step)
2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/script/py.py", line 148, in run
2015-01-08 08:29:56.494 TRACE keystone     script_func(engine)
2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/common/sql/migrate_repo/versions/061_add_parent_project.py", line 50, in downgrade
2015-01-08 08:29:56.494 TRACE keystone     migration_helpers.remove_constraints(list_constraints(meta))
2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/common/sql/migrate_repo/versions/061_add_parent_project.py", line 24, in list_constraints
2015-01-08 08:29:56.494 TRACE keystone     'ref_column': project_table.c.id}]
2015-01-08 08:29:56.494 TRACE keystone AttributeError: 'MetaData' object has no attribute 'c'
2015-01-08 08:29:56.494 TRACE keystone

** Affects: keystone
     Importance: Undecided
     Assignee: Brant Knudson (blk-u)
         Status: In Progress

** Changed in: keystone
     Assignee: (unassigned) => Brant Knudson (blk-u)

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https://bugs.launchpad.net/bugs/1408658

Title:
  migration 61 downgrade fails using mysql

Status in OpenStack Identity (Keystone):
  In Progress

Bug description:
  
  When trying to downgrade from version 61, it fails with an AttributeError.

  $ keystone-manage db_sync 60
  2015-01-08 08:29:56.494 CRITICAL keystone [-] AttributeError: 'MetaData' object has no attribute 'c'

  2015-01-08 08:29:56.494 TRACE keystone Traceback (most recent call last):
  2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/bin/keystone-manage", line 6, in <module>
  2015-01-08 08:29:56.494 TRACE keystone     exec(compile(open(__file__).read(), __file__, 'exec'))
  2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/bin/keystone-manage", line 44, in <module>
  2015-01-08 08:29:56.494 TRACE keystone     cli.main(argv=sys.argv, config_files=config_files)
  2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/cli.py", line 311, in main
  2015-01-08 08:29:56.494 TRACE keystone     CONF.command.cmd_class.main()
  2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/cli.py", line 74, in main
  2015-01-08 08:29:56.494 TRACE keystone     migration_helpers.sync_database_to_version(extension, version)
  2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/common/sql/migration_helpers.py", line 204, in sync_database_to_version
  2015-01-08 08:29:56.494 TRACE keystone     _sync_common_repo(version)
  2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/common/sql/migration_helpers.py", line 160, in _sync_common_repo
  2015-01-08 08:29:56.494 TRACE keystone     init_version=init_version)
  2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/oslo.db/oslo_db/sqlalchemy/migration.py", line 82, in db_sync
  2015-01-08 08:29:56.494 TRACE keystone     version)
  2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/api.py", line 202, in downgrade
  2015-01-08 08:29:56.494 TRACE keystone     return _migrate(url, repository, version, upgrade=False, err=err, **opts)
  2015-01-08 08:29:56.494 TRACE keystone   File "<string>", line 2, in _migrate
  2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/util/__init__.py", line 160, in with_engine
  2015-01-08 08:29:56.494 TRACE keystone     return f(*a, **kw)
  2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/api.py", line 366, in _migrate
  2015-01-08 08:29:56.494 TRACE keystone     schema.runchange(ver, change, changeset.step)
  2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/schema.py", line 93, in runchange
  2015-01-08 08:29:56.494 TRACE keystone     change.run(self.engine, step)
  2015-01-08 08:29:56.494 TRACE keystone   File "/usr/local/lib/python2.7/dist-packages/migrate/versioning/script/py.py", line 148, in run
  2015-01-08 08:29:56.494 TRACE keystone     script_func(engine)
  2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/common/sql/migrate_repo/versions/061_add_parent_project.py", line 50, in downgrade
  2015-01-08 08:29:56.494 TRACE keystone     migration_helpers.remove_constraints(list_constraints(meta))
  2015-01-08 08:29:56.494 TRACE keystone   File "/opt/stack/keystone/keystone/common/sql/migrate_repo/versions/061_add_parent_project.py", line 24, in list_constraints
  2015-01-08 08:29:56.494 TRACE keystone     'ref_column': project_table.c.id}]
  2015-01-08 08:29:56.494 TRACE keystone AttributeError: 'MetaData' object has no attribute 'c'
  2015-01-08 08:29:56.494 TRACE keystone

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