$ git clone -n https://src.fedoraproject.org/rpms/smatch.git /var/lib/mock/f38-build-side-42-init-devel-1407188-31283/root/chroot_tmpdir/scmroot/smatch
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1407188-31283/root/chroot_tmpdir/scmroot/smatch'...
$ git fetch origin b1a21d86fbdd9ad30c07fd03450afc8e58b16b5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/smatch
 * [new ref]         b1a21d86fbdd9ad30c07fd03450afc8e58b16b5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1a21d8 spec: drop %{?isa} for a noarch package