Allows a component to state dependencies on other plugins

Notice: This plugin is unmaintained and available for adoption.


This plugin allows a Trac component to state a dependency on another Component, via the IRequireComponents interface from componentdependencies.interface:

class IRequireComponents(Interface):
    def requires():
        """list of component classes that this component depends on"""

The Component classes that are returned by the requires method will be enabled upon environment upgrade. This allows the very simple creation of dependencies between components. Of course, for installation, the required components are still required to be part of Python, as given in install_requires in

This plugin will not work if required plugins are not present or loaded.

The files in illustrate how to use the plugin. In your trac.ini file, enable the following plugins:

  • ComponentDependencyPlugin:
    componentdependencies.componentdependency.componentdependencyplugin = enabled
  • TestDependencyPlugin:
    componentdependencies.test.testdependencyplugin = enabled

Trac will then require an upgrade. The FooBarTest component will be enabled in the upgrade.

Bugs/Feature Requests

Existing bugs and feature requests for ComponentDependencyPlugin are here.

If you have any issues, create a new ticket.


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Download the zipped source from here.

The plugin is also available on PyPI.


You can check out ComponentDependencyPlugin from here using Subversion, or browse the source with Trac.


General instructions on installing Trac plugins can be found on the TracPlugins page.

Recent Changes

17722 by rjollos on 2020-05-06 00:24:56
TracComponentDependency 0.3: Add classifiers

Version 0.3 has been released to PyPI.

Fixes #13691.

17595 by rjollos on 2019-11-25 23:35:08
TracComponentDependency 0.2: Prepare to publish on PyPI

Refs #13691.

17562 by rjollos on 2019-11-17 20:06:51
Make compatible with Trac 1.4


Originally developed at The Open Planning Project

Author: k0s
Maintainer: none (needsadoption)

Last modified 2 years ago Last modified on Mar 3, 2022, 4:04:20 PM