$ git clone -n https://src.fedoraproject.org/rpms/topline.git /var/lib/mock/f41-build-side-1-2670864-29066/root/chroot_tmpdir/scmroot/topline
Cloning into '/var/lib/mock/f41-build-side-1-2670864-29066/root/chroot_tmpdir/scmroot/topline'...
$ git fetch origin 3e584bca49dc35e16cce6cb151a9548b3b09c79a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/topline
 * [new ref]         3e584bca49dc35e16cce6cb151a9548b3b09c79a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e584bc convert GPLv2+ license to SPDX