$ git clone -n https://gitee.com/wenyuzifang/libxml2.git /var/lib/mock/dist-an23-build-446797-73363/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-an23-build-446797-73363/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin f6ed30e86923ae089da8639bc5e98df5fa978d2c:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/libxml2
 * [new ref]         f6ed30e86923ae089da8639bc5e98df5fa978d2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6ed30e Update code from upstream