$ git clone -n https://src.fedoraproject.org/rpms/openmpi.git /var/lib/mock/f45-build-39459-735/root/chroot_tmpdir/scmroot/openmpi
Cloning into '/var/lib/mock/f45-build-39459-735/root/chroot_tmpdir/scmroot/openmpi'...
$ git fetch origin d46d1d9b6180eed7e96c07be60e6c55d532b588f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openmpi
 * [new ref]         d46d1d9b6180eed7e96c07be60e6c55d532b588f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d46d1d9 Drop unused recommonmark