$ git clone -n https://gitee.com/src-opencloudos-rpms/libxml2.git /var/lib/mock/dist-oc9-build-42754-14591/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-oc9-build-42754-14591/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libxml2
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d5d4ce import libxml2-2.9.14-3.tl4