$ git clone -n https://src.fedoraproject.org/rpms/mate-screensaver.git /var/lib/mock/f45-build-18080-508/root/chroot_tmpdir/scmroot/mate-screensaver
Cloning into '/var/lib/mock/f45-build-18080-508/root/chroot_tmpdir/scmroot/mate-screensaver'...
$ git fetch origin 91aadbc96add663099339990af02652eabddf97f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mate-screensaver
 * [new ref]         91aadbc96add663099339990af02652eabddf97f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91aadbc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild