$ git clone -n https://src.fedoraproject.org/rpms/mpi4py.git /var/lib/mock/f41-build-side-2-python-2688487-30181/root/chroot_tmpdir/scmroot/mpi4py
Cloning into '/var/lib/mock/f41-build-side-2-python-2688487-30181/root/chroot_tmpdir/scmroot/mpi4py'...
$ git fetch origin a5b1279b096c2bc3b34dbbd6f8ef9f79b985dc5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mpi4py
 * [new ref]         a5b1279b096c2bc3b34dbbd6f8ef9f79b985dc5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5b1279 4.0.0