$ git clone -n https://src.fedoraproject.org/rpms/byacc.git /var/lib/mock/f40-build-2195554-51531/root/chroot_tmpdir/scmroot/byacc
Cloning into '/var/lib/mock/f40-build-2195554-51531/root/chroot_tmpdir/scmroot/byacc'...
$ git fetch origin 1c5566002d24356ba7df40df092eccf0de629a9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/byacc
 * [new ref]         1c5566002d24356ba7df40df092eccf0de629a9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c55660 Rebuilt to re-trigger automated bodhi (Fedora Updates System) tests