$ git clone -n https://gitee.com/src-opencloudos-rpms/xz.git /var/lib/mock/dist-oc9-build-121837-71789/root/chroot_tmpdir/scmroot/xz
Cloning into '/var/lib/mock/dist-oc9-build-121837-71789/root/chroot_tmpdir/scmroot/xz'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/xz
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 07111a5 import xz-5.4.7-2.tl4