$ git clone -n https://src.fedoraproject.org/rpms/xorg-x11-drivers.git /var/lib/mock/f45-build-39000-731/root/chroot_tmpdir/scmroot/xorg-x11-drivers
Cloning into '/var/lib/mock/f45-build-39000-731/root/chroot_tmpdir/scmroot/xorg-x11-drivers'...
$ git fetch origin 6cef12ea0ddef5a5f25a14e8b5508e497a87786d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xorg-x11-drivers
 * [new ref]         6cef12ea0ddef5a5f25a14e8b5508e497a87786d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6cef12e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild