$ git clone -n https://gitee.com/src-opencloudos-rpms/ecj.git /var/lib/mock/dist-oc9-build-64052-16463/root/chroot_tmpdir/scmroot/ecj
Cloning into '/var/lib/mock/dist-oc9-build-64052-16463/root/chroot_tmpdir/scmroot/ecj'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/ecj
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48c4b9e import ecj-4.23-3.tl4