[Distutils] Installed Extras Metadata

[Alex Grönholm]

Pradyun Gedam kirjoitti 26.01.2018 klo 17:11:
> Hello! I hope everyone's had a great start to 2018! :)
>
> A few months back, while working on pip, I had noticed an oddity about 
> extras.
>
> Installing a package with extras would not store information about the 
> fact that the extras were requested. This means, later, it is not 
> possible to know which extra-based optional dependencies of a package 
> have to be considered when verifying that the packages are compatible 
> with each other. This information is relavant for 
> resolution/validation since without it, it is not possible to know 
> which the extra-requirements to care about.
>
> As an example, installing ``requests[security]`` and then uninstalling 
> ``PyOpenSSL`` leaves you in a state where you don't really satisfy 
> what was asked for but there's no way to detect that either.
What here is specific to extras really? "pip uninstall" does not 
consider dependencies anyway and will happily let you uninstall whatever 
you want, even if it's a dependency of some still installed distribution.
>
> Thus, obviously, I'm interested in making pip to be able to store this 
> information. As I understand, this is done needs to be specified in a 
> PEP and/or on PyPUG's specification page.
>
> To that end, here's seeding proposal for the discussion: a new 
> `extras-requested.txt` file in the .dist-info directory, storing the 
> extra names in a one-per-line format.
>
> Cheers!
> Pradyun
>
>
>
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