$ git clone -n https://src.fedoraproject.org/rpms/gravity-beams-and-evaporating-stars.git /var/lib/mock/f45-build-12998-444/root/chroot_tmpdir/scmroot/gravity-beams-and-evaporating-stars
Cloning into '/var/lib/mock/f45-build-12998-444/root/chroot_tmpdir/scmroot/gravity-beams-and-evaporating-stars'...
$ git fetch origin 6f5e1a95b4cfa27e125d7e105e80ad27f5c8fccb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gravity-beams-and-evaporating-stars
 * [new ref]         6f5e1a95b4cfa27e125d7e105e80ad27f5c8fccb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f5e1a9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild