$ git clone -n https://src.fedoraproject.org/rpms/mlpack.git /var/lib/mock/f38-build-side-42-init-devel-759646-27691/root/chroot_tmpdir/scmroot/mlpack
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-759646-27691/root/chroot_tmpdir/scmroot/mlpack'...
$ git fetch origin 4e506778223d3266f9cdcc1f3d84962929035df2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mlpack
 * [new ref]         4e506778223d3266f9cdcc1f3d84962929035df2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e50677 Use SPDX identifiers and add Apache-2.0