Developer Guide

If you have questions related to Restraint’s development that are not currently answered in this guide, the two main ways to contact the Restraint development team are the same as those for getting general assistance with using and installing Beaker:

This document focuses on the mechanics of working with Restraint’s code base with the target audience being a Restraint user interested in learning more about Restraint’s working or a potential Restraint contributor.

Getting Started

Restraint is written in C. The source lives in a git repo on along with other related projects. Let’s create a local clone of the Restraint source:

$ git clone git://

Restraint uses a number of external libraries/tools, so before you can build Restraint you need to install the external libraries using yum-builddep restraint.spec. Once you have installed these dependencies, running a make at the source directory root will compile and build Restraint. To also run a quick sanity check, it is a good idea to run the unit tests using make check. The unit tests use a simple Python HTTP server and git-daemon, so you will need to install this as well (yum -y install git-daemon).

Testing Changes

If you have fixed an existing bug or implemented a new feature, it is a good idea to add a relevant test. The existing tests can be found in the src/ directory in the source files with names starting with test_.

It may also be a good idea to run a recipe by building the Restraint daemon and client from the modified code base. Once you have built the binaries using make, run make install to install the Restraint daemon, client and other bits. Start the Restraint daemon in one terminal (as root user):

# restraintd
Waiting for client!

From another terminal, use the Restraint client to execute a recipe:

# restraint --host 1= --job path/to/recipe

More details can be found in Running Standalone.

Submitting a Patch

Patches must first be submitted for review to the Beaker project’s gerrit code review installation. It may be convenient to setup a git remote as follows:

[remote "restraint-gerrit"]

Once you’re happy with the change and the test you have written for it, push your local branch to Gerrit for review:

git push restraint-gerrit myfeature:refs/for/master