This system uses the [[:fedora:Koji|Koji]] build software, which is a client-server hub-builder system. Jobs are queued by client systems (whether manually, by package maintainers, or automatically, by a script) to the hub; the builders pick up jobs from the hub and execute them, building software packages and performing related maintenance (such as repository updates). Package builds are performed with [[:fedora:Projects/Mock|Mock]] using an isolated, chroot build environment created specifically for the package being built.