Modules

The code relevant to GNOME Hardware Testing lives mostly in the following modules in GNOME git.

gnome-hwtest: the controller scripts that run on the controller and test systems
gnome-hwtest-simulator: a test application for hacking on Hardware Testing project - it simulates a controller and test machine using virtual machines.
gnome-continuous: build scripts that build both the systems we test, and also the images used for running the controller machine and updating test systems.
gnome-shell: contains the performance metric measurement system and the actual test script that runs within the session.
perf-web: the web application running on perf.gnome.org

Other modules that are somewhat relevant:

ostree: updating and distribution of the images is done using ostree
gnome-ostree-integration: contains operating system customizations that are used for booting GNOME within ostree.
yocto: the base system that gnome-continuous builds from is a fork of the upstream yocto project tree. (On github)