$ git clone -n https://gitee.com/mgb01105731/python-tornado.git /var/lib/mock/dist-an23-build-353317-71018/root/chroot_tmpdir/scmroot/python-tornado
Cloning into '/var/lib/mock/dist-an23-build-353317-71018/root/chroot_tmpdir/scmroot/python-tornado'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/python-tornado
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02f0393 update to 6.3.3