Each installed conffile would be copied to a private dpkg directory. This
would allow dpkg to have the previos unmodified conffile that was packaged,
so dpkg would be able to:
1) Calculate the delta between both packaged conffiles ( d(1,2) ).
2) Show that to the user.
3) Optionally merge with existing conffile = p(m, d(1,2) ) .
1--------2
\
\
m
Without the special dir there are other nice things that can be done as
well:
1) Make the diff between the user-modified file and the new packaged
version = d(m,2).
2) Let the user edit the patch choosing wich modifications he would like
to have applied.
The latter form is what I'm already using for conffile handling myself.
