$ git clone -n https://src.fedoraproject.org/rpms/xbacklight.git /var/lib/mock/f45-build-38604-725/root/chroot_tmpdir/scmroot/xbacklight
Cloning into '/var/lib/mock/f45-build-38604-725/root/chroot_tmpdir/scmroot/xbacklight'...
$ git fetch origin b9fc2e0b2d892ef2798823e3f4b266a5c88b01ad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xbacklight
 * [new ref]         b9fc2e0b2d892ef2798823e3f4b266a5c88b01ad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9fc2e0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild