$ git clone -n https://gitee.com/opencloudos-stream/python-nitrate.git /var/lib/mock/dist-oc9-epol-build-95563-59665/root/chroot_tmpdir/scmroot/python-nitrate
Cloning into '/var/lib/mock/dist-oc9-epol-build-95563-59665/root/chroot_tmpdir/scmroot/python-nitrate'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/python-nitrate
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad1de54 update