How to contribute

If you would like to contribute to the development of OpenStack, you must follow the steps in this page:

Once those steps have been completed, changes to OpenStack should be submitted for review via the Gerrit tool, following the workflow documented at:

Pull requests submitted through GitHub will be ignored.

Bugs should be filed on Launchpad, not GitHub:

How to run unit tests

oslo.db (as all OpenStack projects) uses tox to run unit tests. You can find general information about OpenStack unit tests and testing with tox in wiki.

oslo.db tests use PyMySQL as the default MySQL DB API driver (which is true for OpenStack), and psycopg2 for PostgreSQL. pip will build these libs in your venv, so you must ensure that you have the required system packages installed for psycopg2 (PyMySQL is a pure-Python implementation and so needs no additional system packages). For Ubuntu/Debian they are python-dev, and libpq-dev. For Fedora/CentOS - gcc, python-devel and postgresql-devel.

The oslo.db unit tests system allows to run unittests on real databases. At the moment it supports MySQL, PostgreSQL and SQLite. For testing on a real database backend you need to set up a user openstack_citest with password openstack_citest on localhost (some OpenStack projects require a database named ‘openstack_citest’ too). Please note, that this user must have permissions to create and drop databases. If the testing system is not able to connect to the backend, tests on it will be skipped.

For PostgreSQL on Ubuntu you can create a user in the following way:

sudo -u postgres psql
postgres=# create user openstack_citest with createdb login password
           'openstack_citest';

For MySQL you can use the following commands:

mysql -u root
mysql> CREATE USER 'openstack_citest'@'localhost' IDENTIFIED BY
       'openstack_citest';
mysql> GRANT ALL PRIVILEGES ON * . * TO 'openstack_citest'@'localhost';
mysql> FLUSH PRIVILEGES;

See the script tools/test-setup.sh on how the databases are set up excactly in the OpenStack CI infrastructure and use that for your set up.

Alternatively, you can use pifpaf to run the unit tests directly without setting up the database yourself. You still need to have the database software installed on your system. The following tox environments can be used:

tox -e py27-mysql
tox -e py27-postgresql
tox -e py34-mysql
tox -e py34-postgresql
tox -e py27-all
tox -e py34-all

The database will be set up for you locally and temporarily on each run.

Another way is to start pifpaf manually and use it to run the tests as you wish:

$ eval `pifpaf -g OS_TEST_DBAPI_ADMIN_CONNECTION run postgresql`
$ echo $OS_TEST_DBAPI_ADMIN_CONNECTION
postgresql://localhost/postgres?host=/var/folders/7k/pwdhb_mj2cv4zyr0kyrlzjx40000gq/T/tmpMGqN8C&port=9824
$ tox -e py27
[…]
$ tox -e py34
[…]
# Kill pifpaf once you're done
$ kill $PIFPAF_PID