$ git clone -n https://src.fedoraproject.org/rpms/texlive-collection-luatex.git /var/lib/mock/f45-build-37201-712/root/chroot_tmpdir/scmroot/texlive-collection-luatex
Cloning into '/var/lib/mock/f45-build-37201-712/root/chroot_tmpdir/scmroot/texlive-collection-luatex'...
$ git fetch origin bdb2241317cc3926597e409f527739fa12343e8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/texlive-collection-luatex
 * [new ref]         bdb2241317cc3926597e409f527739fa12343e8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdb2241 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild