$ git clone -n https://src.fedoraproject.org/rpms/python-pyunicorn.git /var/lib/mock/f39-build-1653824-40516/root/chroot_tmpdir/scmroot/python-pyunicorn
Cloning into '/var/lib/mock/f39-build-1653824-40516/root/chroot_tmpdir/scmroot/python-pyunicorn'...
$ git fetch origin 229e99d58aa148c3f96b359cfb55810ac3d7c5ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pyunicorn
 * [new ref]         229e99d58aa148c3f96b359cfb55810ac3d7c5ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 229e99d Fix version mismatch (RPM vs. upstream)