$ git clone -n https://src.fedoraproject.org/rpms/kommit.git /var/lib/mock/f41-build-side-1-2647433-27302/root/chroot_tmpdir/scmroot/kommit
Cloning into '/var/lib/mock/f41-build-side-1-2647433-27302/root/chroot_tmpdir/scmroot/kommit'...
$ git fetch origin c8c4672d1537ff3344a1f9c01e34763411998e94:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kommit
 * [new ref]         c8c4672d1537ff3344a1f9c01e34763411998e94 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8c4672 Update to 1.6.0.