$ git clone -n https://src.fedoraproject.org/rpms/reposurgeon.git /var/lib/mock/f45-build-34475-687/root/chroot_tmpdir/scmroot/reposurgeon
Cloning into '/var/lib/mock/f45-build-34475-687/root/chroot_tmpdir/scmroot/reposurgeon'...
$ git fetch origin 3adca82cf56f22be464b9f5f49c9e43a9337d5e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/reposurgeon
 * [new ref]         3adca82cf56f22be464b9f5f49c9e43a9337d5e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3adca82 Remove stale 'xmlto' BuildRequires