$ git clone -n https://gitee.com/src-opencloudos-rpms/libxml2.git /var/lib/mock/dist-oc8-build-124905-74466/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-oc8-build-124905-74466/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin 5e982623ea73052399cb2f8381c6e9a252c4d917:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libxml2
 * [new ref]         5e982623ea73052399cb2f8381c6e9a252c4d917 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e98262 import libxml2-2.9.7-19.tl3