$ git clone -n https://src.fedoraproject.org/rpms/gnome-system-log.git /var/lib/mock/f45-build-11552-432/root/chroot_tmpdir/scmroot/gnome-system-log
Cloning into '/var/lib/mock/f45-build-11552-432/root/chroot_tmpdir/scmroot/gnome-system-log'...
$ git fetch origin 71b9b996060db29866e36f82ea13764f628d86c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-system-log
 * [new ref]         71b9b996060db29866e36f82ea13764f628d86c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71b9b99 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild