This devoted to teaching you how to extend and develop for Aegir to encourage contributions to the Aegir project or to help you modify Aegir to suit your unique use case.
This section documents methods and best-practices for hacking on Aegir core or building a contrib module. You should probably become familiar with the Extending Aegir section before proceeding much further.
Aegir API documentation
The inline documentation is a good start to understand the various hooks and internals that allow you to extend and customize Aegir to your liking. The documentation is rendered on api.aegirproject.org daily.
See also the developer cheat sheet.
Please submit any suggestions or bug reports to the Aegir Project issue queue of your choice, under the "documentation" component.
Aegir ships with a set of example modules that illustrate how to extend Aegir in various ways. These are fully functional, and are often used as a template to get the required boilerplate in place.
In addition, the Contributed Extensions page documents all known Aegir extensions in existence. Reading through some of these modules' code is a good way to familiarize yourself with how the Aegir API works.
Aegir Development Environment
There are multiple ways you can setup a development environment to get working on Aegir itself.
See Contributed Extensions - Development for the options.