$ git clone -n https://github.com/xcp-ng-rpms/xo-lite.git /var/lib/mock/v8.3-incoming-10264-28844/root/chroot_tmpdir/scmroot/xo-lite
Cloning into '/var/lib/mock/v8.3-incoming-10264-28844/root/chroot_tmpdir/scmroot/xo-lite'...
$ git fetch origin 6df863e36286c9c90fb9188c4c40b21ea7089968:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xo-lite
 * [new ref]         6df863e36286c9c90fb9188c4c40b21ea7089968 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6df863e Update to version 0.18.0