$ git clone -n https://gitee.com/opencloudos-stream/perl-Data-Buffer.git /var/lib/mock/dist-oc9-epol-build-93479-59437/root/chroot_tmpdir/scmroot/perl-Data-Buffer
Cloning into '/var/lib/mock/dist-oc9-epol-build-93479-59437/root/chroot_tmpdir/scmroot/perl-Data-Buffer'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/perl-Data-Buffer
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58c4b7a update