$ git clone -n https://github.com/xcp-ng-rpms/rsync /var/lib/mock/v8.3-incoming-9089-27939/root/chroot_tmpdir/scmroot/rsync
Cloning into '/var/lib/mock/v8.3-incoming-9089-27939/root/chroot_tmpdir/scmroot/rsync'...
$ git fetch origin 682b5bbedd220cfecb27e472b19be891257a3c83:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/rsync
 * [new ref]         682b5bbedd220cfecb27e472b19be891257a3c83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 682b5bb Merge branch 'XS-8.3' into 8.3-XS-1557