$ git clone -n https://src.fedoraproject.org/rpms/livesys-scripts.git /var/lib/mock/f45-build-17455-499/root/chroot_tmpdir/scmroot/livesys-scripts
Cloning into '/var/lib/mock/f45-build-17455-499/root/chroot_tmpdir/scmroot/livesys-scripts'...
$ git fetch origin 1ef3679e81b07cf9d24d445cd6e7c5746f624c92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/livesys-scripts
 * [new ref]         1ef3679e81b07cf9d24d445cd6e7c5746f624c92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ef3679 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild