$ git clone -n https://src.fedoraproject.org/rpms/python-columnar.git /var/lib/mock/f45-build-30076-642/root/chroot_tmpdir/scmroot/python-columnar
Cloning into '/var/lib/mock/f45-build-30076-642/root/chroot_tmpdir/scmroot/python-columnar'...
$ git fetch origin 9c083555dfb9fdd4555e0840a49668285a45e0ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-columnar
 * [new ref]         9c083555dfb9fdd4555e0840a49668285a45e0ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c08355 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild