$ git clone -n https://gitee.com/src-opencloudos-rpms/libfastjson.git /var/lib/mock/dist-oc9-build-42155-14591/root/chroot_tmpdir/scmroot/libfastjson
Cloning into '/var/lib/mock/dist-oc9-build-42155-14591/root/chroot_tmpdir/scmroot/libfastjson'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libfastjson
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b2dd92 import libfastjson-0.99.9-3.tl4