$ git clone -n https://src.fedoraproject.org/rpms/sane-frontends.git /var/lib/mock/f45-build-35589-696/root/chroot_tmpdir/scmroot/sane-frontends
Cloning into '/var/lib/mock/f45-build-35589-696/root/chroot_tmpdir/scmroot/sane-frontends'...
$ git fetch origin 429296e6f63bf7f3640f2c0fbbf38fdb8309f2de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sane-frontends
 * [new ref]         429296e6f63bf7f3640f2c0fbbf38fdb8309f2de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 429296e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild