$ git clone -n https://gitee.com/src-opencloudos-rpms/libxml2.git /var/lib/mock/dist-oc8-build-238183-82514/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-oc8-build-238183-82514/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin 896a68945dea75148fce5ed4cf2e98b114399e57:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libxml2
 * [new ref]         896a68945dea75148fce5ed4cf2e98b114399e57 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 896a689 import libxml2-2.9.7-21.tl3.4