$ git clone -n https://gitee.com/src-opencloudos-rpms/libxml2.git /var/lib/mock/dist-oc8-build-250637-84017/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-oc8-build-250637-84017/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin 75ed5be0175a18bb51e94374c6f8f77cbd24d0cf:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libxml2
 * [new ref]         75ed5be0175a18bb51e94374c6f8f77cbd24d0cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75ed5be import libxml2-2.9.7-21.tl3.9