$ git clone -n https://github.com/xcp-ng-rpms/xo-lite.git /var/lib/mock/v8.3-incoming-9210-28007/root/chroot_tmpdir/scmroot/xo-lite
Cloning into '/var/lib/mock/v8.3-incoming-9210-28007/root/chroot_tmpdir/scmroot/xo-lite'...
$ git fetch origin 9651025bbc3bbc8662aeb9c364d379f9c3da03e1:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xo-lite
 * [new ref]         9651025bbc3bbc8662aeb9c364d379f9c3da03e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9651025 We keep the build.json file