$ git clone -n https://gitee.com/opencloudos-stream/cdbs.git /var/lib/mock/dist-oc9-epol-build-82187-57079/root/chroot_tmpdir/scmroot/cdbs
Cloning into '/var/lib/mock/dist-oc9-epol-build-82187-57079/root/chroot_tmpdir/scmroot/cdbs'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/cdbs
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d4c953 package init