Okay, but I would like to hear Paul's response to that first. On Aug 25, 2017 12:54 AM, "Nick Coghlan" <ncogh...@gmail.com> wrote:
> On 25 August 2017 at 14:33, xoviat <xov...@gmail.com> wrote: > > Just this morning, Paul said the following: > > > > That step's the problem. If the frontend does that it can potentially > > be copying a lot of unneeded stuff (VCS history, for example). We > > tried that with pip and it was a major issue. That problem is the > > *whole point* of all the discussions about the various proposals that > > ended up with build_tree. > > > > I took that to mean that we were trusting the backend to do the right > thing. > > And most people agreed with that. I don't personally care but there does > > seem to be some miscommunication here. > > Folks are wanting the "right thing" to be defined in the spec, but > that's the wrong place for it, since "the right thing" will be use > case dependent. So I'm now saying "stop trying to define what the > right thing is (beyond producing standards compliant artifacts), and > instead just define a usable thing, run with it, and let consensus on > 'the right thing' emerge over time". > > Donald and Paul originally didn't like that notion, but then Paul > realised that pip had never actually tried implementing the "always > build an sdist first" approach. That means pip's notion of "the right > thing" can be adequately captured as "source tree -> sdist -> wheel" > producing the same results as "source tree -> wheel", and pip can > strongly encourage that behaviour in backend implementations by always > trying build_sdist first, and only falling back to calling build_wheel > directly if build_sdist raises NotImplementedError. > > Particular *frontends* (including pip) may further refine their > definition of the "right thing" to categorically disallow source tree > changes, but that's something they can do over time based on the bug > reports they actually receive, rather than needing to be mandated a > priori in the interface specification. > > Cheers, > Nick. > > -- > Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia >
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