$ git clone -n https://gitee.com/opencloudos-stream/python-backoff.git /var/lib/mock/dist-oc9-epol-build-84267-57309/root/chroot_tmpdir/scmroot/python-backoff
Cloning into '/var/lib/mock/dist-oc9-epol-build-84267-57309/root/chroot_tmpdir/scmroot/python-backoff'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/python-backoff
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c506f63 package init