$ git clone -n https://gitee.com/src-opencloudos-rpms/libxml2.git /var/lib/mock/dist-oc8-build-138423-79704/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-oc8-build-138423-79704/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin cea68d7279d86141b3204e3edcb680c6526634fa:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libxml2
 * [new ref]         cea68d7279d86141b3204e3edcb680c6526634fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cea68d7 import libxml2-2.9.7-20.tl3