$ git clone -n https://src.fedoraproject.org/rpms/lightning.git /var/lib/mock/f45-build-17378-498/root/chroot_tmpdir/scmroot/lightning
Cloning into '/var/lib/mock/f45-build-17378-498/root/chroot_tmpdir/scmroot/lightning'...
$ git fetch origin 6a7ee1b9a96df97b8bee7f39c32e2811800ac46d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lightning
 * [new ref]         6a7ee1b9a96df97b8bee7f39c32e2811800ac46d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a7ee1b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild