$ git clone -n https://gitee.com/src-opencloudos-rpms/libxml2.git /var/lib/mock/dist-oc8-build-66467-16711/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-oc8-build-66467-16711/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin e344f42cdc9b11f674ac58b9c9736e815ffe8b69:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libxml2
 * [new ref]         e344f42cdc9b11f674ac58b9c9736e815ffe8b69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e344f42 import libxml2-2.9.7-18.tl3