$ git clone -n https://src.fedoraproject.org/rpms/lxhotkey.git /var/lib/mock/f45-build-17791-504/root/chroot_tmpdir/scmroot/lxhotkey
Cloning into '/var/lib/mock/f45-build-17791-504/root/chroot_tmpdir/scmroot/lxhotkey'...
$ git fetch origin b3810b5e1cba443501dddcb7ee1f15c383e8b46c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lxhotkey
 * [new ref]         b3810b5e1cba443501dddcb7ee1f15c383e8b46c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3810b5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild