[Distutils] status check on PEP 517

[Daniel Holth]

On Fri, Jul 28, 2017 at 7:12 PM Nathaniel Smith <njs at pobox.com> wrote:

> On Fri, Jul 28, 2017 at 1:58 PM, Thomas Kluyver <thomas at kluyver.me.uk>
> wrote:
> > I think this was actually a question that someone (Nathaniel?) brought
> up:
> > is the project source directory on sys.path when the backend is loaded? I
> > would lean yes, so that it's possible to have a custom backend in the
> > project tree, but I think whoever brought it up before was leaning no.
>
> You're probably thinking of
>
> https://github.com/njsmith/peps/blob/90f7adc130cbae741b1abd3a9ad407ba6731ea9f/pep-0517.txt#L976-L987
>
> As noted there, my suggestion would be that we don't put the project
> directory on sys.path by default, but that we do provide an explicit
> configuration key that lets projects name a directory in the project
> tree that should be prepended to sys.path. So example:
>
> [build-system]
> python-path = ["."]
> build-backend = "my_custom_backend"    # refers to
> my_custom_backend.py in the project root
>
> # - or -
>
> [build-system]
> python-path = ["tools"]
> build-backend = "my_custom_backend"    # refers to
> tools/my_custom_backend.py
>
> Rationale:
>
> - Having the project source directory on sys.path when you don't
> expect it is confusing and error-prone
> - If you do want it on sys.path then it's easy to add a line to
> pyproject.toml, explicit > implicit
> - I think it's an anti-pattern how every piece of tooling wants to
> claim part of the top-level directory (.travis.yml, appveyor.yml,
> .readthedocs.yml, CONTRIBUTING.yml, ...) -- pyproject.toml has to go
> there because it's the root where all our tooling starts from, but we
> should support projects that want to tuck away the rest of their
> tooling into some subdirectory :-)
>
> Given how much trouble we're having with PEP 517 already, it might
> make more sense to have PEP 517 just mandate that the directory not be
> on sys.path, and make a little follow-up PEP just for python-path.
>

But can you not also make bridges out of stone?
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