$ git clone -n https://src.fedoraproject.org/rpms/plexus-containers.git /var/lib/mock/f41-build-2030634-25291/root/chroot_tmpdir/scmroot/plexus-containers
Cloning into '/var/lib/mock/f41-build-2030634-25291/root/chroot_tmpdir/scmroot/plexus-containers'...
$ git fetch origin b080f410428663a7f0b63b5c4a61a746bb8f069b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-containers
 * [new ref]         b080f410428663a7f0b63b5c4a61a746bb8f069b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b080f41 Switch javapackages tests to f41 branch