[Distutils] Provisionally accepting PEP 517's declarative build system interface
ncoghlan at gmail.com
Fri Jun 2 12:26:33 EDT 2017
[Note: I've reverted the PEP to Draft status while this discussion is
On 3 June 2017 at 00:56, Thomas Kluyver <thomas at kluyver.me.uk> wrote:
> On Fri, Jun 2, 2017, at 03:41 PM, Nick Coghlan wrote:
>> Instead, the flow that I think makes sense is "VCS -> sdist tree [->
>> sdist tree -> sdist tree -> ...] -> wheel", and the above model where
>> the export filtering is only used when PKG-INFO doesn't exist yet will
>> give us that.
> I still object to conflating 'filter the files needed to build a wheel'
> with 'build an sdist' - these are different tasks which I would
> implement differently
This concerns me somewhat, as if a backend implements the two
differently, then it means building from an sdist and building from a
VCS checkout may give different results (since they may contain
Could you provide a little more detail as to what you would do
differently in exporting the contents of an sdist that wouldn't apply
to export a build tree? (aside from skipping emitting PKG-INFO)
>. And flit cannot do (sdist tree -> sdist tree).
It wouldn't be required to - since a PKG-INFO would be present in that
case, the front end would just copy the directory without bothering
the backend about it.
> The options as I see them:
> 1. Make it the responsibility of the backend, not the frontend, to build
> cleanly (except for setup.py builds). Then there's no need for a hook to
> filter a build tree before building a wheel.
No, we're not going to do that - build isolation will be the
> 2. Define a hook to filter the files into a build tree, as a separate
> notion from building sdists.
While Donald seems more amenable to this now, I still don't understand
the difference you see between the two (aside from PKG-INFO
potentially being unneeded in the build tree case, depending on how
the backend handles creation of the METADATA file)
Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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