Continuous integration/Documentation generation
Documentation is automatically generated and published to doc.wikimedia.org.
For increased flexibility and security, the static sites are generated inside WMCS instances.
The docs are then fetched from the instance to the CI production host, and pushed with rsync to the documentation host (
doc.discovery.wmnet as of March 2022).
This page documents the workflow, part of the technical implementation, and how to define a new job.
|Gerrit event||Zuul pipeline||Description|
||When a change is merged by Gerrit|
||A reference is changed (tip of branch changes, tags modifications)|
ref-updated could cover the changes being merged since the target branch is updated, but the event is not associated with a Gerrit change number which prevents us from reporting back to the Gerrit interface.
We thus use:
postmergepipeline to report back in Gerrit so the user knows the documentation has been generated
publishpipeline which solely handles references updates matching
In both cases, (
ref-updated) we trigger the same job to generate the documentation for any branch or tag.
We thus need to namespace the documentation under https://doc.wikimedia.org based on the branch name or the tag name.
The information is carried differently between events and the reference is slightly different between branch updates and tags.
The conversion logic is carried by a Zuul python function which is applied to all the publish jobs.
It injects to the Gearman function (and thus the Jenkins job environment) a variable
DOC_SUBPATH which represents the version.
- A change merged on
DOC_SUBPATH = REL1_35
DOC_SUBPATH = 1.35.0
Reference: Gerrit change 173049
We can thus reuse that
DOC_SUBPATH parameter to easily namespace the jobs per version.
As an example, https://doc.wikimedia.org/mediawiki-core/ has documentation for both release branches (https://doc.wikimedia.org/mediawiki-core/REL1_37/) and tags (https://doc.wikimedia.org/mediawiki-core/1.36.2).
Jenkins job builder definitions
In a job definition, a
builder defines what steps to execute.
We provide a builder macro called
doc-publish that takes care of transferring the generated files to the web server of https://doc.wikimedia.org/.
It takes two parameters:
docsrcDirectory holding documentation files relative to workspace (without trailing slash)
docdestDirectory under https://doc.wikimedia.org/.
Example job definition:
# Typical PHP project - job-template: name: myproject-publish builders: - doxygen - doc-publish: docsrc: 'doc/html' docdest: myproject # Typical JS project - job-template: name: myproject-publish builders: - jsduck - doc-publish: docsrc: 'docs' docdest: myproject
This will invoke the build scripts (doxygen and jsduck) and publish their results (respectively in doc/html and docs) to https://doc.wikimedia.org/myproject/.
To namespace the documentation based on project version, use the Zuul-generated
DOC_SUBPATH (derived from branch or tag name).
Simply insert it in the
You will need to invoke the builder assert-env-doc_subpath.
Example for MediaWiki (mediawiki-core-doxygen-publish job):
- job: name: 'mediawiki-core-doxygen-publish' builders: - assert-env-doc_subpath - zuul-cloner: projects: > mediawiki/core mediawiki/vendor # Build the documentation under /build/doc - shell: | rm -rf build/doc mkdir -p build/doc TARGET_BASEDIR="$WORKSPACE/build/doc" /srv/deployment/integration/slave-scripts/tools/mwcore-docgen.sh # Publish from build/doc to mediawiki-core/$DOC_SUBPATH/php' - doc-publish: docsrc: 'build/doc' docdest: 'mediawiki-core/$DOC_SUBPATH/php'
This publishes the documentation at https://doc.wikimedia.org/mediawiki-core/master/php/, and also publishes release branch documentation such as https://doc.wikimedia.org/mediawiki-core/REL1_34/php/, and tagged releases such as https://doc.wikimedia.org/mediawiki-core/1.34.0/php/
For architecture overview and runbooks, see wikitech:Doc.wikimedia.org
- Continuous integration/Entry points describes the conventions for extension automation. If you follow these when developing your extension, then (with a lot of CI wizardry), tests run and documentation generates "automagically".