$ git clone -n https://gitee.com/src-opencloudos-rpms/deltarpm.git /var/lib/mock/dist-oc9-build-40960-14591/root/chroot_tmpdir/scmroot/deltarpm
Cloning into '/var/lib/mock/dist-oc9-build-40960-14591/root/chroot_tmpdir/scmroot/deltarpm'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/deltarpm
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc3bffb import deltarpm-3.6.3-3.tl4