$ git clone -n https://gitee.com/src-opencloudos-rpms/libxml2.git /var/lib/mock/dist-oc8-build-250236-83968/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-oc8-build-250236-83968/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin 2c8203503c60683cdb8de6b8adfec47859e4b3f5:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libxml2
 * [new ref]         2c8203503c60683cdb8de6b8adfec47859e4b3f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c82035 import libxml2-2.9.7-21.tl3.8