$ git clone -n https://gitee.com/src-opencloudos-rpms/libxml2.git /var/lib/mock/dist-oc8-build-175418-79920/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-oc8-build-175418-79920/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin 051483b4b9d8e905f45dfd552a203cc23aafcb59:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libxml2
 * [new ref]         051483b4b9d8e905f45dfd552a203cc23aafcb59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 051483b import libxml2-2.9.7-21.tl3.1