$ git clone -n https://gitee.com/src-opencloudos-rpms/Box2D.git /var/lib/mock/dist-oc9-build-40478-14589/root/chroot_tmpdir/scmroot/Box2D
Cloning into '/var/lib/mock/dist-oc9-build-40478-14589/root/chroot_tmpdir/scmroot/Box2D'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/Box2D
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b19c8ef import Box2D-2.4.1-3.tl4