$ git clone -n https://src.fedoraproject.org/rpms/jblas.git /var/lib/mock/f39-build-2152591-50912/root/chroot_tmpdir/scmroot/jblas
Cloning into '/var/lib/mock/f39-build-2152591-50912/root/chroot_tmpdir/scmroot/jblas'...
$ git fetch origin a0216bab52a5160e576b5517563360dbc0fe7c9d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jblas
 * [new ref]         a0216bab52a5160e576b5517563360dbc0fe7c9d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0216ba Convert license tag to SPDX