$ git clone -n https://gitee.com/opencloudos-stream/R-yaml.git /var/lib/mock/dist-oc9-epol-build-111225-67669/root/chroot_tmpdir/scmroot/R-yaml
Cloning into '/var/lib/mock/dist-oc9-epol-build-111225-67669/root/chroot_tmpdir/scmroot/R-yaml'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/R-yaml
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60a3971 update