Mock is a tool for reproducible build of RPM packages.
Python Shell C Makefile


A 'simple' chroot build environment manager for building RPMs.

Mock is used by the Fedora Build system to populate a chroot environment, which is then used in building a source-RPM (SRPM). It can be used for long-term management of a chroot environment, but generally a chroot is populated (using DNF), an SRPM is built in the chroot to generate binary RPMs, and the chroot is then discarded.

User documentation

This is area for developers. You may be looking for user documentation.


Mock source tarballs:

Mock Branches

Mock currently has one active branch plus master.

  • mock-1.0 - This branch is in bugfix mode and is used for EL-5
  • master - This is currently mock 1.3.x and is still getting features. It is used for everything else. This branch is used pure for releasing.
  • devel - all development happens here, if you want to send patches, use this branch


Do you have a patch, an idea, or just a question? You can write to buildsys mailing list or try #fedora-buildsys on Freenode. We prefer email though.

Getting and compiling mock

git clone
cd mock
tito build --rpm

Latest release for all supported platforms can be found in this Copr repository.


Package from latest commit in devel branch can be obtained from

Latest status: build status