$ git clone -n https://gitee.com/opencloudos-stream/vnstat.git /var/lib/mock/dist-ocs23-epol9-build-157560-9986/root/chroot_tmpdir/scmroot/vnstat
Cloning into '/var/lib/mock/dist-ocs23-epol9-build-157560-9986/root/chroot_tmpdir/scmroot/vnstat'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/vnstat
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da8a6ee package init