76b40c5c12
In file doc/source/devref/development.environment.rst added packages build-dep and python-mysqldb which I have had to add on ubuntu 12.04 to enable the dev environment to be setup. Without these run_tests.sh fails with error 'mysql_config not found' when setting up the virtual env. Change-Id: I4af775386469deecf122a9e165457f241339b20b
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Copyright 2010-2011 United States Government as represented by the
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Administrator of the National Aeronautics and Space Administration.
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All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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Setting Up a Development Environment
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====================================
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This page describes how to setup a working Python development
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environment that can be used in developing nova on Ubuntu, Fedora or
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Mac OS X. These instructions assume you're already familiar with
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git. Refer to GettingTheCode_ for additional information.
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.. _GettingTheCode: http://wiki.openstack.org/GettingTheCode
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Following these instructions will allow you to run the nova unit
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tests. If you want to be able to run nova (i.e., launch VM instances),
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you will also need to install libvirt and at least one of the
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`supported hypervisors`_. Running nova is currently only supported on
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Linux, although you can run the unit tests on Mac OS X. See
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:doc:`../quickstart` for how to get a working version of OpenStack
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Compute running as quickly as possible.
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.. _supported hypervisors: http://wiki.openstack.org/HypervisorSupportMatrix
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Virtual environments
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--------------------
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Nova development uses `virtualenv <http://pypi.python.org/pypi/virtualenv>`__ to track and manage Python
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dependencies while in development and testing. This allows you to
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install all of the Python package dependencies in a virtual
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environment or "virtualenv" (a special subdirectory of your nova
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directory), instead of installing the packages at the system level.
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.. note::
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Virtualenv is useful for running the unit tests, but is not
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typically used for full integration testing or production usage.
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Linux Systems
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-------------
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.. note::
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This section is tested for Nova on Ubuntu (10.10-64) and
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Fedora-based (RHEL 6.1) distributions. Feel free to add notes and
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change according to your experiences or operating system.
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Install the prerequisite packages.
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On Ubuntu::
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sudo apt-get install python-dev libssl-dev python-pip git-core libxml2-dev libxslt-dev
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On Ubuntu Precise (12.04) you may also need to add the following packages::
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sudo apt-get install build-dep python-mysqldb
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On Fedora-based distributions (e.g., Fedora/RHEL/CentOS/Scientific Linux)::
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sudo yum install python-devel openssl-devel python-pip git
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Mac OS X Systems
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----------------
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Install virtualenv::
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sudo easy_install virtualenv
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Check the version of OpenSSL you have installed::
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openssl version
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If you have installed OpenSSL 1.0.0a, which can happen when installing a
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MacPorts package for OpenSSL, you will see an error when running
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``nova.tests.auth_unittest.AuthTestCase.test_209_can_generate_x509``.
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The stock version of OpenSSL that ships with Mac OS X 10.6 (OpenSSL 0.9.8l)
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or Mac OS X 10.7 (OpenSSL 0.9.8r) works fine with nova.
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Getting the code
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----------------
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Grab the code from GitHub::
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git clone https://github.com/openstack/nova.git
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cd nova
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Running unit tests
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------------------
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The unit tests will run by default inside a virtualenv in the ``.venv``
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directory. Run the unit tests by doing::
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./run_tests.sh
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The first time you run them, you will be asked if you want to create a virtual
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environment (hit "y")::
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No virtual environment found...create one? (Y/n)
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See :doc:`unit_tests` for more details.
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.. _virtualenv:
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Manually installing and using the virtualenv
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--------------------------------------------
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You can manually install the virtual environment instead of having
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``run_tests.sh`` do it for you::
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python tools/install_venv.py
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This will install all of the Python packages listed in the
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``tools/pip-requires`` file into your virtualenv. There will also be some
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additional packages (pip, distribute, greenlet) that are installed
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by the ``tools/install_venv.py`` file into the virutalenv.
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If all goes well, you should get a message something like this::
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Nova development environment setup is complete.
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To activate the Nova virtualenv for the extent of your current shell session
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you can run::
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$ source .venv/bin/activate
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Or, if you prefer, you can run commands in the virtualenv on a case by case
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basis by running::
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$ tools/with_venv.sh <your command>
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Contributing Your Work
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----------------------
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Once your work is complete you may wish to contribute it to the project. Add
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your name and email address to the ``Authors`` file, and also to the ``.mailmap``
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file if you use multiple email addresses. Your contributions can not be merged
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into trunk unless you are listed in the Authors file. Nova uses the Gerrit
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code review system. For information on how to submit your branch to Gerrit,
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see GerritWorkflow_.
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.. _GerritWorkflow: http://wiki.openstack.org/GerritWorkflow
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