James <[email protected]> wrote: >[cr > DAG's All this can work only if you reflect the complete history in the DAG. Such approaches had been discussed and eliminated as unrealistic: You do not want to keep the history forever; the data will always grow and eventually be too much. Moreover, there can be overlays which might be added, perhaps eventually are abondened, replaced by other overlays, etc. It is not realistic to expect a complete history from them since you installed once from them.
One must face the fact that at one stage you have the tree you installed and at another stage you have the current tree with possibly dramatic changes and no complete history of all changes. In the lack of such a history, simply there is information missing to decide the correct proceeding. You have to choose your poison which is either to take the old tree or the new tree as a basis (and to fill the gaps from the other tree). > Exactly. The current tools are insufficient The available information is *in principle* insufficient.
