$ git clone -n https://gitee.com/src-opencloudos-rpms/libxml2 /var/lib/mock/dist-oc8-build-32449-9752/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-oc8-build-32449-9752/root/chroot_tmpdir/scmroot/libxml2'...
$ git reset --hard origin/oc8
HEAD is now at d641e36 import libxml2-2.9.7-15.tl3