$ git clone -n https://src.fedoraproject.org/rpms/mariadb10.11.git /var/lib/mock/f41-build-850657-165537/root/chroot_tmpdir/scmroot/mariadb10.11
Cloning into '/var/lib/mock/f41-build-850657-165537/root/chroot_tmpdir/scmroot/mariadb10.11'...
$ git fetch origin b52a9bbc4a09bfea646f64ec759e07063588a709:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mariadb10.11
 * [new ref]         b52a9bbc4a09bfea646f64ec759e07063588a709 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b52a9bb Fix MTR port calculation