Using Mock is easy

18. 09. 2022 | Jakub Kadlčík | EN fedora mock howto packaging

There are a lot of articles and documentation pages explaining how to use Mock but I am hesitant to share them with new Fedora packagers because they make the tool look much scarier than it actually is. Using Mock is easy!

Why Mock?

Unlike rpmbuild which builds packages directly on your computer without any isolation, Mock spawns a container with a minimal build environment and builds your package inside. As a consequence:


Install Mock from the Fedora repositories.

sudo dnf install mock

By default, Mock can be used only by the root user. Please don’t run it with sudo and instead add yourself to the mock group.

sudo usermod -a -G mock $USER


Mock takes an SRPM and produces an RPM package for a given Fedora version and architecture. If you don’t have an SRPM package yet, you need to build it from a spec file first. If you downloaded an SRPM package from the internet or already built it, you can skip this step.

rpmbuild -bs /path/to/your/foo.spec

And pass the resulting SRPM to Mock.

mock /path/to/your/foo.src.rpm

By default Mock builds the RPM packages for the Fedora version and architecture that matches your system. If you want to specify a different target, use the -r parameter and press <TAB> twice to see all the possible options.

Read further

If interested, you can read more about Mock configuration files, containers, plugins, and other features.

In case you want to build your packages using Mock but you don’t want to do it on your computer, use Copr. It’s easy, just follow this screenshot tutorial.