On Tue, Feb 14, 2017 at 1:10 PM, Vinay Sajip <vinay_sa...@yahoo.co.uk> wrote:
> > humpty in term uses uses distlib which seems to mishandle wheel > > metadata. (For example, it chokes if there's extra distribution meta and > > makes it impossible for buildout to install python-dateutil from a > wheel.) > > I looked into the "mishandling". It's that the other tools don't adhere to > [the current state of] PEP 426 as closely as distlib does. For example, > wheel writes JSON metadata to metadata.json in the .dist-info directory, > whereas PEP 426 calls for that data to be in pydist.json. The non-JSON > metadata in the wheel (the METADATA file) does not strictly adhere to any > of the metadata PEPs 241, 314, 345 or 426 (it has a mixture of incompatible > fields). > > I can change distlib to look for metadata.json, and relax the rules to be > more liberal regarding which fields to accept, but adhering to the PEP > isn't mishandling things, as I see it. > Fair enough. Notice that I said "seems to". :-] I suppose whether to be strict or not depends on use case. In my case, I was just trying to install a wheel as an egg, so permissive is definately what *I* want. Other use cases might want to be more strict. > > Work on distlib has slowed right down since around the time when PEP 426 > was deferred indefinitely, and there seems to be little interest in > progressing via metadata or other standardisation - we have to go by what > the de facto tools (setuptools, wheel) choose to do. It's not an ideal > situation, and incompatibilities can crop up, as you've seen. > Nope. Honestly, though, I wish there was *one* *library* that defined the standard, which was the case for setuptools for a while (yeah, I know, the warts, really, I know) because I really don't think there's a desire to innovate or a reason for competition at this level. In the case of wheel, perhaps it makes sense for that implementation to be authoritative. Thanks. Jim -- Jim Fulton http://jimfulton.info
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