$ git clone -n https://src.fedoraproject.org/rpms/python-cffi.git /var/lib/mock/f45-build-39458-735/root/chroot_tmpdir/scmroot/python-cffi
Cloning into '/var/lib/mock/f45-build-39458-735/root/chroot_tmpdir/scmroot/python-cffi'...
$ git fetch origin c0e0c9e21e0c07aec11ad22b6334b9af80f9a83c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-cffi
 * [new ref]         c0e0c9e21e0c07aec11ad22b6334b9af80f9a83c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0e0c9e Update to 2.1.1