$ git clone -n https://src.fedoraproject.org/rpms/jblas.git /var/lib/mock/f39-build-1504064-35004/root/chroot_tmpdir/scmroot/jblas
Cloning into '/var/lib/mock/f39-build-1504064-35004/root/chroot_tmpdir/scmroot/jblas'...
$ git fetch origin 9210cc0198846eb0bb57225aec8b253fd3f3a38b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jblas
 * [new ref]         9210cc0198846eb0bb57225aec8b253fd3f3a38b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9210cc0 Stop compiling for i686