Setting Up a Development Environment¶

Virtual environments¶

Cinder development uses virtualenv to track and manage Python dependencies while in development and testing. This allows you to install all of the Python package dependencies in a virtual environment or “virtualenv” (a special subdirectory of your cinder directory), instead of installing the packages at the system level.

Linux Systems¶

sudo ansible-pull -U https://github.com/stmcginnis/cinder-dev-setup

Install the prerequisite packages.

On Ubuntu20.04-64:

sudo apt-get install libssl-dev python3-pip libmysqlclient-dev libpq-dev libffi-dev

To get a full python3 development environment, the two python3 packages need to be added to the list above:

python3-dev python3-pip

On Red Hat-based distributions e.g., Fedora/RHEL/CentOS/Scientific Linux (tested on CentOS 6.5 and CentOS 7.3):

sudo yum install python-virtualenv openssl-devel python-pip git gcc libffi-devel libxslt-devel mysql-devel postgresql-devel

On openSUSE-based distributions (SLES 12, openSUSE 13.1, Factory or Tumbleweed):

sudo zypper install gcc git libmysqlclient-devel libopenssl-devel postgresql-devel python-devel python-pip

macOS Systems¶

Install virtualenv:

sudo pip install virtualenv

Check the version of OpenSSL you have installed:

openssl version

If you have installed OpenSSL 1.0.0a, which can happen when installing a MacPorts package for OpenSSL, you will see an error when running cinder.tests.auth_unittest.AuthTestCase.test_209_can_generate_x509.

The stock version of OpenSSL that ships with Mac OS X 10.6 (OpenSSL 0.9.8l) or later should work fine with cinder.

Getting the code¶

Grab the code:

git clone https://opendev.org/openstack/cinder.git
cd cinder

Running unit tests¶

The preferred way to run the unit tests is using tox. It executes tests in isolated environment, by creating separate virtualenv and installing dependencies from the requirements.txt and test-requirements.txt files, so the only package you install is tox itself:

sudo pip install tox

Run the unit tests by doing:

tox -e py3

See Testing for more details.

Manually installing and using the virtualenv¶

You can also manually install the virtual environment:

tox -e py3 --notest

This will install all of the Python packages listed in the requirements.txt file into your virtualenv.

To activate the Cinder virtualenv you can run:

$ source .tox/py3/bin/activate

To exit your virtualenv, just type:

$ deactivate

Or, if you prefer, you can run commands in the virtualenv on a case by case basis by running:

$ tox -e venv -- <your command>

Contributing Your Work¶

Once your work is complete you may wish to contribute it to the project. Cinder uses the Gerrit code review system. For information on how to submit your branch to Gerrit, see GerritWorkflow.