$ git clone -n https://src.fedoraproject.org/rpms/guichan.git /var/lib/mock/f45-build-13236-447/root/chroot_tmpdir/scmroot/guichan
Cloning into '/var/lib/mock/f45-build-13236-447/root/chroot_tmpdir/scmroot/guichan'...
$ git fetch origin b7c3b34b29026c95d3f73e2af5c405a65ba826df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guichan
 * [new ref]         b7c3b34b29026c95d3f73e2af5c405a65ba826df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7c3b34 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild