$ git clone -n https://src.fedoraproject.org/rpms/flopgen.git /var/lib/mock/f45-build-9079-398/root/chroot_tmpdir/scmroot/flopgen
Cloning into '/var/lib/mock/f45-build-9079-398/root/chroot_tmpdir/scmroot/flopgen'...
$ git fetch origin 5034a91e544618fa6cf7c85afb7ea129819c8288:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flopgen
 * [new ref]         5034a91e544618fa6cf7c85afb7ea129819c8288 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5034a91 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild