$ git clone -n https://src.fedoraproject.org/rpms/scalapack.git /var/lib/mock/f42-build-3367135-45050/root/chroot_tmpdir/scmroot/scalapack
Cloning into '/var/lib/mock/f42-build-3367135-45050/root/chroot_tmpdir/scmroot/scalapack'...
$ git fetch origin ce601d67e58e48d2705bec47745e6d21a47a9200:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/scalapack
 * [new ref]         ce601d67e58e48d2705bec47745e6d21a47a9200 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce601d6 hack in _cmake_lib_suffix64