Daniel Sahlberg wrote on Sun, 11 Apr 2021 10:59 +00:00:
> Den fre 9 apr. 2021 kl 22:20 skrev Julian Foad <julianf...@apache.org>:
> > Daniel and Daniel, thanks for your replies.
> > 
> > Responding in summary, after taking all your points and questions into 
> > consideration.
> > 
> > 1. I agree with softening this to be a warning rather than a hard error in 
> > a patch release, and then a hard error in 1.15. I hadn't thought of doing a 
> > preprocessor-based time-bomb; good idea. I will retract my backport until I 
> > have done that.
> > 
> > 2. Returning to 1.6/1.7 behaviour is not something to be aspired to. Never 
> > mind the reversion of the source:target comparison in 1.8 being accidental; 
> > at least in part, the omission of sufficient URL comparisons in the first 
> > place was accidental (the source1:source2 part), and even if some of the 
> > possible combinations of inputs "worked" in 1.6/1.7 we can agree for sure 
> > that the set of possible combinations is not well tested. 1.6/1.7 did not 
> > cleanly implement a policy of "URLs can differ as long as they point to the 
> > same or equivalent repositories". Rather it was, URLs can differ in the 
> > source:target inputs (but not the source1:source2 inputs) to certain merge 
> > entry points, in the sense that we don't reject this, and it may even 
> > partly or fully work with merge tracking merges, but we are not sure and 
> > nothing is tested except "foreign merge" cases. I wouldn't want to see us 
> > introduce any half-measure, but only a full policy of "we distinguish 
> > repositories by their UUID rather than any given URL, in all cases" which 
> > should include non-merge cases such as diff as well, and I think that is 
> > out of scope at the present time and investment level in Subversion; it 
> > would be a "Subversion 2" wish list item if we ever go there.

FWIW, I don't immediately see why this is a milestone=2.0 matter.  It
may be possible to implement this backwards-compatibly.

> It seems to me that you have thought this through and I'm not the one 
> to question your judgement.
> 
> Would this be something that should go in the "Most wanted" list in 
> https://subversion.apache.org/roadmap.html?

+1 to Julian's answer.

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