As part of planning out the python3 transition we realized that in order to have a self-testing patch in each repository to switch the documentation build to use python3, we would need to include some information in the repository that the job would read to decide which version of python to use. After considering several options, we realized that this requirement meant we had set the API for the documentation jobs at the wrong "level" of the stack. This patch restores the use of tox for building documentation in the standard project testing interface. Rather than using the "venv" environment, it specifies a new environment for "docs", based on the common pattern we have in most projects to provide that as a convenience for developers. The Python-specific notes about adding the environment as a convenience are removed, since it is now required. Change-Id: Ibdee118f30972e9dc67952b921f493e9c1a116ff Signed-off-by: Doug Hellmann <doug@doughellmann.com>
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Project Testing Interface
OpenStack has a lot of projects. For each project, the OpenStack CI system needs to be able to perform a lot of tasks. If each project has a slightly different way to accomplish those tasks, it makes the management of a consistent testing infrastructure very difficult to deal with. Additionally, because of the high volume of development changes and testing, the testing infrastructure has to be able to pre-cache artifacts that are normally fetched over the internet. To that end, each project should support a consistent interface for driving tests and other necessary tasks.
The following tasks are required for every project. Every project must:
- Execute tests
- Enforce code style
- Generate a code coverage report
- Generate a source tarball
- Generate documentation
- Generate releasenotes
The following are other common tasks, which may not be relevant for every project:
- Enforce code coverage
- Generate a release artifact
- Publish a release artifact
- Import translation strings
- Export translation strings
Tools and approaches vary by language, please choose which language is relevant to you.
Documentation
OpenStack has decided to standardize on using Sphinx for project documentation, regardless of programming language.
Note
The use of sphinx for documentation is intended for documentation that is not written inside of docstrings or code comments. Languages, such as Go, that natively support a system for documenting the code through code comments, should use those native systems. Sphinx is intended to be used for documentation that is not written inline with the code.
To support documentation generation, projects should:
- Have sphinx documentation source in
doc/source
- List python dependencies needed for documentation in
doc/requirements.txt
- List distro package pre-reqs for dependencies in
bindep.txt
using thedoc
tag. - Depend on
openstackdocstheme
for documentation and configure it to be used indoc/source/conf.py
. - Have a
docs
environment set up in atox.ini
file within the repository.
Assuming non-Python requirements have been properly installed as
indicated by bindep.txt
, the following command should work
with no additional setup and should result in the documentation being
emitted into doc/build/html
.
tox -e docs
Note
We strongly discourage project teams from adding commands to the
docs
environment beyond:
sphinx-build -W -b html doc/source doc/build/html
Additional logic needed around Sphinx generation should go into Sphinx plugins.
Language specific instructions supplement these and are in addition to them.
Release Notes
OpenStack uses reno for generating release notes regardless of programming language.
To support releasenotes generation, projects should:
- Have releasenotes documentation source in
releasenotes/
- Configure
openstackdocstheme
to be used inreleasenotes/source/conf.py
. - Optionally list distro package pre-reqs for dependencies in
bindep.txt
using thereleasenotes
tag.
Assuming requirements have been properly installed, the following
command should work with no additional setup and should result in the
releasenotes being emitted into
releasenotes/build/html
.
sphinx-build -a -E -W -d releasenotes/build/doctrees -b html \
releasenotes/source releasenotes/build/html
Language specific instructions supplement these and are in addition to them.
Linux Distributions
The following operating systems are the most popular when deploying OpenStack:
Ubuntu (latest LTS)
CentOS (latest stable)
Note
The CentOS distribution is derived from the sources of Red Hat Enterprise Linux (RHEL). In reality, RHEL is more popular than CentOS but we can't use this platform on upstream gates, so we rely on CentOS.
Each project should run some functional tests on these platforms so we make sure OpenStack works with distros used in production. The scope of these functional tests are discussed for every project, and may adjust their coverage depending of resources and support investment. These tests are run by using existing tooling, which comes with a reasonable expectation that it's viable on the indicated distributions.
Sometimes, these distributions might not support all dependencies required by new features in OpenStack. Development of these features should not be blocked, though it has to be documented in project release notes, and some tests might have to be skipped on these distributions.
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