Re: [Monotone-devel] Re: Delta storage

[Zbynek Winkler]

Bruce Stephens wrote:

> > Given a revision B and C does it matter if you say "we store B->C"  or
> > "B<-C"? In both cases once you have one of the revisions you can
> > reconstruct the other. No? The only difference would be where it
> > starts...
> >    
> Not all deltas are reversible.  If the delta B->C says "delete lines
> 38-57", then that doesn't let you construct the delta C->B.  (monotone
> stores binary deltas of the xdelta form, I believe, but I think the
> same sort of thing can happen in those.)
>  
I see. I guess I was thinking more in the terms of patchfiles and the 
lines with "+" or "-" at the beginning. So the question is - are all 
deltas in monotone reversible? I remember something about reversing 
deltas for the 'update' command when updating working copy to be based 
on a different revision before commit...? That revision doesn't need to 
be a parent, it can be a sibling...

Zbynek

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Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic