$ git clone -n https://src.fedoraproject.org/rpms/combblas.git /var/lib/mock/f45-build-4750-333/root/chroot_tmpdir/scmroot/combblas
Cloning into '/var/lib/mock/f45-build-4750-333/root/chroot_tmpdir/scmroot/combblas'...
$ git fetch origin 455cd3989ed1db1ed139bfb7e1d0b8a519cfe9df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/combblas
 * [new ref]         455cd3989ed1db1ed139bfb7e1d0b8a519cfe9df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 455cd39 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild