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Our Philosophy

Edk2 Pytool Extensions (edk2toolext) is a Tianocore maintained project consisting of command line and other python tools and extensions to simplify and automate the process of building and maintaining an Edk2 based UEFI Firmware code tree.


If stuart is already integrated into your platform and you're looking for a tutorial on how to install and use stuart, please see Installation, Building, and Core CI Instructions.

As UEFI developers, we found the process of building firmware to be extremely rigid and hard to customize without the use of disjointed scripts that would only work under extremely specific circumstances. Due to this, we sought to develop a build system to manage our environment and it's dependencies in a easily configurable, yet extremely reliable and fashion - even across operating systems.

As we developed this system, we found ourselves referring to it as 'the environment' because it is just a complex series of system states... But it's more fun to imagine that your code and enviornment is being managed by a helpful pet. This is how Stuart came to be; he is a mouse that lives inside your computer. He takes care of your code and even manages your environment for you. Executing commands such as building a platform is as simple as asking Stuart to do it for you. You can ask him to do many things... see some of them here!.

What does Stuart Manage for us

Stuart is responsible for many things, so lets take a look at them, and see how you can use it to simplify your building experience!

The Environment

Stuart uses a self describing environment to read and understand workspaces. The Environment is a collection of path, pypath, build vars, and plugin configurations needed for a build to execute successfully.

Settings Manager

Stuart's invocables are very smart but they don't know everything. The paradigm we've come up with is to have each invocable provide an abstract Settings Manager class with a 'get' function for each piece of information required invocation. Invoking an edk2 invocable requires that an instance of this class be passed in. This way, the invocable script gets all the information it needs without needing to carry the overhead of command line parsing and loading the class.

Settings Manager documentation


Stuart allows many different workflows in the same tree, but needs a way to organize the environment in a way that identifies which component are used by which workflows. Stuart manages this via scopes! Each component can have only one scope, and a workflow designates a combination of scopes, known as ActiveScopes to specify which components to use in a workflow.


Stuart manages many plugins that are executed in specific workflows according to their scope. There are three different types of plugins that exist and can be implemented.

  1. UefiBuildPlugin - Used for platform builds, this interface has two hooks: pre-build and post-build.
  2. CiBuildPlugin - Our CI process is to run all CiBuildPlugins for each package. Each plugin is essentially a test that will be executed on the given code tree.
  3. UefiHelperPlugin - Registers one or more functions that can called by any part of the build system.

Plugin Manager Documentation

External Dependencies

External dependencies (ext_deps) are a great way to manage tools and resources for a codebase. You provide a _ext_dep.json file that indicates the source, type (git, web download, NuGet, etc.), scope, and version. Stuart will manage the rest! When you call stuart_update, Stuart will collect, download, and store the ext_deps pertaining to your scope. Stuart will make sure these ext_deps are available to the rest of the environment.

External Dependency Documentation

Environment Variables

Different then your operating system environment variables, Stuart will also manage variables defined across your FDF, DSC, DEC, ext_deps, build scripts and ensures a variable defined in one is available to all others. This means if a variable is set in the build script, it can then be used in your FDF, DSC, etc (and vise versa).

Environment Variable Documentation

What can I ask Stuart to do

I'm glad you asked! Stuart has a variety of invocable tasks that he hopes will be helpful for a wide variety workflows.


Sets up the git repo based on the gitsubmodule file in your repo. It checks to make sure the required repos as provided by settings manager are present.


Reads ext_dep files in the environment and downloads the appropriate files for the active scopes currently defined. These scopes come from the settings manager.


Builds a platform. Requires an instance of UefiBuilder to be provided in addition to the settings manager.


Intended for CI environment setup. Given a list of required repos from the settings manager, clone each of them in the workspace.


Given a list of packages, runs all plugins (for active scope) on each package. This includes compiler plugin, which builds each package for the required targets. Stuart will checkpoint the original environment and restore that checkpoint between each test.


Will parse and Edk2 workspace and create a standalone sqlite3 database that can be queried through sql tools or by stuart_report to generate common uefi/edk2 focused reports.


Consumes the sqlite3 database generated by stuart_report that can run prebuilt queries and reports against the database.

Living with Stuart


We have a couple .gitignore items that are important for keeping git from getting its hands on Stuart!