[Bug 1450945] Re: sahara can't create database schema by default

[James Page]

Still a problem for Kilo:

Setting up sahara-common (2015.1.0-0ubuntu1~cloud0) ...
Traceback (most recent call last):
  File "/usr/bin/sahara-db-manage", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/dist-packages/sahara/db/migration/cli.py", line 110, in main
    CONF.command.func(config, CONF.command.name)
  File "/usr/lib/python2.7/dist-packages/sahara/db/migration/cli.py", line 49, in do_upgrade_downgrade
    do_alembic_command(config, cmd, revision, sql=CONF.command.sql)
  File "/usr/lib/python2.7/dist-packages/sahara/db/migration/cli.py", line 30, in do_alembic_command
    getattr(alembic_cmd, cmd)(config, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/alembic/command.py", line 165, in upgrade
    script.run_env()
  File "/usr/lib/python2.7/dist-packages/alembic/script.py", line 382, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/usr/lib/python2.7/dist-packages/alembic/util.py", line 241, in load_python_file
    module = load_module_py(module_id, path)
  File "/usr/lib/python2.7/dist-packages/alembic/compat.py", line 79, in load_module_py
    mod = imp.load_source(module_id, path, fp)
  File "/usr/lib/python2.7/dist-packages/sahara/db/migration/alembic_migrations/env.py", line 95, in <module>
    run_migrations_online()
  File "/usr/lib/python2.7/dist-packages/sahara/db/migration/alembic_migrations/env.py", line 79, in run_migrations_online
    poolclass=pool.NullPool)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/__init__.py", line 362, in create_engine
    return strategy.create(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/strategies.py", line 51, in create
    dialect_cls = u.get_dialect()
AttributeError: 'NoneType' object has no attribute 'get_dialect'

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https://bugs.launchpad.net/bugs/1450945

Title:
  sahara can't create database schema by default

Status in ubuntu-cloud-archive:
  Fix Released

Bug description:
  Sahara does not support SQLite, so sahara-common will fail to be
  installed if /etc/sahara/sahara.conf does not contain valid database
  connection and if the database does not actually exist and is not running.

  We should not try to run the db_sync during the postinstall, because
  it's not obvious deployers already have the database up and running
  and moreover the sahara configuration file ready to connect to MySQL
  (chicken and egg).

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