$ git clone -n https://gitee.com/src-opencloudos-rpms/librist.git /var/lib/mock/dist-oc9-epol-build-54494-14768/root/chroot_tmpdir/scmroot/librist
Cloning into '/var/lib/mock/dist-oc9-epol-build-54494-14768/root/chroot_tmpdir/scmroot/librist'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/librist
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f1c7f0 import librist-0.2.7-2.tl4