$ git clone -n https://gitee.com/opencloudos-stream/ristretto.git /var/lib/mock/dist-oc9-epol-build-96023-59747/root/chroot_tmpdir/scmroot/ristretto
Cloning into '/var/lib/mock/dist-oc9-epol-build-96023-59747/root/chroot_tmpdir/scmroot/ristretto'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/ristretto
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66dc8d8 package init