The way license appear on PyPi seems wrong

[jeandet]

I'm not sure if this is the expected behavior but setting license = {file="COPYING"} and "License :: OSI Approved :: GNU General Public License v3 (GPLv3)" doesn't work as expected for example with flit:
https://github.com/SciQLop/PyISTP/blob/main/pyproject.toml
I get on PyPi:

---

While with mesonpy:
https://github.com/SciQLop/CDFpp/blob/main/pyproject.toml
I get on PyPi:

---

BTW you get the same on PyPi:

---

This seems more related to mesonpy than PyPi I think.

[rgommers]

This is similar to what I asked in gh-88.

We got it working in SciPy: https://pypi.org/project/scipy/. You could have a look at SciPy's pyproject.toml.

[jeandet]

@rgommers indeed pretty close, thank you for your precious help! I've looked into scipy pyproject.toml it looks almost exactly like mine, reading #88 I feel like you do something manually but can't figure out what and how exactly. Do you override the license file during dist process? Is this related to the [tool.doit] section?

[rgommers]

Ugh, I have to retract the "we got it working" I'm afraid. I downloaded the sdist, and the License field there is not matching what is shown on PyPI. For the 1.9.0 release we actually built the sdist with meson-python and the wheels with numpy.distutils, because we didn't get the wheel build CI machinery updated in time. It looks to me like PyPI took the license info from the first wheel that was uploaded, and not from the sdist.

Is this related to the [tool.doit] section?

No, that's completely unrelated.

[jeandet]

Ah, ok, it makes sense then. Thank you :).

[rgommers]

So gh-88 solved including the license file as a file in the sdist/wheel. It did not solve how the License field appears on PyPI. It's unclear to me how exactly PyPI goes from License: BSD in PKG-INFO of a wheel or sdist to License: BSD License (BSD) shown in the Meta section in the left sidebar. Whatever it is, PEP 621 doesn't seem all that helpful here.

[jeandet]

I've looked into PKG-INFO files generated by flit and mesonpy I think it comes from this:

with mesonpy:

Metadata-Version: 2.1
Name: pycdfpp
Version: 0.3.4-5-g35b11ff
Summary: A modern C++ header only cdf library
Home-page: https://github.com/SciQLop/CDFpp
Author-Email: Alexis Jeandet <[email protected]>
License: GNU GENERAL PUBLIC LICENSE
                              Version 3, 29 June 2007
        
            An easy to use ISTP loader package.
            Copyright (C) 2022  Alexis Jeandet
        
            This program is free software: you can redistribute it and/or modify
            it under the terms of the GNU General Public License as published by
            the Free Software Foundation, either version 3 of the License, or
            (at your option) any later version.
        
            This program is distributed in the hope that it will be useful,
            but WITHOUT ANY WARRANTY; without even the implied warranty of
            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
            GNU General Public License for more details.
        
            You should have received a copy of the GNU General Public License
            along with this program.  If not, see <http://www.gnu.org/licenses/>.
        
        Also add information on how to contact you by electronic and paper mail.
        
          You should also get your employer (if you work as a programmer) or school,
        if any, to sign a "copyright disclaimer" for the program, if necessary.
        For more information on this, and how to apply and follow the GNU GPL, see
        <http://www.gnu.org/licenses/>.
        
          The GNU General Public License does not permit incorporating your program
        into proprietary programs.  If your program is a subroutine library, you
        may consider it more useful to permit linking proprietary applications with
        the library.  If this is what you want to do, use the GNU Lesser General
        Public License instead of this License.  But first, please read
        <http://www.gnu.org/philosophy/why-not-lgpl.html>.
Classifier: Development Status :: 2 - Pre-Alpha
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: GNU General Public License v3 (GPLv3)
Classifier: Natural Language :: English
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Project-URL: Homepage, https://github.com/SciQLop/CDFpp
Requires-Python: >=3.7
Requires-Dist: numpy
Description-Content-Type: text/markdown
...

While with flit:

Metadata-Version: 2.1
Name: pyistp
Version: 0.1.3
Summary: An easy to use ISTP loader package.
Keywords: satellite,plasma-physics,nasa-data,amda,cdpp,CDF
Author-email: Alexis Jeandet <[email protected]>
Maintainer-email: Alexis Jeandet <[email protected]>
Requires-Python: >=3.7
Description-Content-Type: text/x-rst
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Science/Research
Classifier: License :: OSI Approved :: GNU General Public License v3 (GPLv3)
Classifier: Natural Language :: English
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Requires-Dist: pycdfpp
Project-URL: homepage, https://github.com/SciQLop/PyISTP
...

Looks like it works better when License key isn't there, then PyPi seems to look into Classifier: License.

[jeandet]

Note that this could change with flit doing like mesonpy if this gets merged :/ pypa/flit#537

[FFY00]

@di could you advise on the correct path forward?

[di]

Here's how PyPI uses these fields: https://github.com/pypi/warehouse/blob/39daea188d2e1e6494c50753cd48cb5a8da3e8c4/warehouse/packaging/views.py#L111-L123

The fact that the entire license is being displayed when built with meson makes me think that the metadata is not being written correctly, as PyPI should only be displaying the first line of the file.

[rgommers]

as PyPI should only be displaying the first line of the file.

That seems like a regression too. The first line is typically copyright info, for example for SciPy:

Copyright (c) 2001-2002 Enthought, Inc. 2003-2022, SciPy Developers.

Why not let the classifier take precedence if it exists? Until we get SPDX license expressions, that seems like the only reasonable behavior here.

[di]

Because, historically, when someone specifies the License field, they wanted to see that value displayed on PyPI. Per the core metadata spec, License is supposed to be used instead of classifiers:

Text indicating the license covering the distribution where the license is not a selection from the “License” Trove classifiers.

But in practice, people tend to specify both. Generally, providing multiple lines for License is a configuration mistake, so instead of dropping an entire file in the sidebar, PyPI just displays the first line, which is usually the name of the license (but isn't guaranteed to be).

[rgommers]

Generally, providing multiple lines for License is a configuration mistake,

PEP 621 says to provide the license file (from which the full text contents are then taken), or the license text itself: https://peps.python.org/pep-0621/#license. So hardly a mistake I'd think?

so instead of dropping an entire file in the sidebar, PyPI just displays the first line, which is usually the name of the license (but isn't guaranteed to be).

It seemed to me that the behavior you describe was supposed to be superseded by PEP 621. It would be quite odd that to get the correct behavior, one must not use the license field in PEP 621 (which should be the place for project metadata), but instead use a trove classifier. It looks like this interaction was missed in PEP 621 review?

And if this was thought about, then PEP 621 should say something explicitly about this I'd think?

[di]

We essentially punted on making significant changes here until PEP 639 is accepted.

[rgommers]

Hmm, so should we open a PR to add a warning in PEP 621 to not use the license field? It is odd that trying to follow the spec as it is written leads to such malformed behavior, and then hearing that "we punted" (not sure if that's PyPI maintainers, or PyPA, or ?). PEP 621 is Final after all, so clearly something is wrong here.

[bryevdv]

We essentially punted on making significant changes here until PEP 639 is accepted.

@di Is there an issue somewhere for PyPI we can follow? Bokeh is getting bitten by this as well. I agree w/ @rgommers that there should be a warning. PEP 621 explicitly demonstrates license = { file = "LICENSE.txt" } in the example in the PEP: https://peps.python.org/pep-0621/#example (which is the reason we used it)

[eli-schwartz]

Yes, it was cross-linked by github above but that isn't as obvious as it could be. The PyPI warehouse software tracked this as pypi/warehouse#12392 but it has now been closed via a commit that limits the license field to 100 characters in order to limit the damage that mishandling can do here.

[FFY00]

I have reopened that issue 👍

[rgommers]

Did that just break our current way of including license files in the sdist (see gh-96)?

[eli-schwartz]

It shouldn't have any effect on the wheel, but currently PyPI displays:

License: BSD License (Copyright (c) 2001-2002 Enthought, Inc. 2003-2022, SciPy Developers. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. 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Now it will only display:

License: Copyright (c) 2001-2002 Enthought, Inc. 2003-2022, SciPy Developers. All rights reserved.  Redistrib...

[rgommers]

That's arguably worse .... now it looks like a non open source license.

[eli-schwartz]

Sorry... I'm not sure where the "BSD License" comes from, it's not in the license file, so that is actually probably still there at the beginning. Does PyPI display both the license file and the classifier? 🤔

I was attempting to reverse-engineer what a future rollout of PyPI will do based on source code, obviously this is prone to inaccuracies because I have no idea how their code works. :P

[rgommers]

Does PyPI display both the license file and the classifier? thinking

Indeed, it looks like PyPI was displaying, until yesterday: **License**: <text-from-classifier> <full-license-text-in-brackets>

We'll see soon what it will do now, because SciPy 1.10.0rc1 will be out within the next 1-2 days.

[rgommers]

This seems to have been fixed in PyPI now. Here's what it looks like for https://pypi.org/project/pyistp/, which is the package @jeandet reported on in the issue description:

Other packages I checked all look fine as well, so I'll close this issue.

[QuLogic]

This also needs to be removed from documentation if it's working now: https://meson-python.readthedocs.io/en/latest/reference/limitations.html#license-field-on-pypi

[rgommers]

Thanks @QuLogic, good point. This was fixed in gh-457.

[bmerry]

I think I'm still affected by this: see https://pypi.org/project/spead2/. It currently shows:

License: GNU Lesser General Public License v3 or later (LGPLv3+) (GNU LESSER GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundati...)

For convenience, here's the source pyproject.toml.

[rgommers]

@bmerry I believe that that is how it's supposed to look now. The original bug report here was about the full license text being shown and the whole sidebar being a mess as a result. Now PyPI cuts it off at ..., which is a good improvement.

Showing the SPDX classifier only will have to wait for PEP 639 to be accepted and implemented.