Groups > linux.debian.maint.python > #16319

Bug#1083471: Migrating away from pkg_resources is difficult for namespace packages

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From	Simon McVittie <smcv@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.maint.python
Subject	Bug#1083471: Migrating away from pkg_resources is difficult for namespace packages
Date	Fri, 04 Oct 2024 15:40:01 +0200
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Cross-posted to 2 groups.

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Control: tags -1 + upstream moreinfo
Control: forwarded -1 https://github.com/projectmallard/mallard-ducktype/issues/21

On Fri, 04 Oct 2024 at 11:22:32 +0100, Colin Watson wrote:
> While pkg_resources is indeed deprecated upstream, there's nothing that
> we can sensibly do about it at the Debian level in lazr.* or zope.*, and
> it's not even as clear as you might hope what to do upstream.  They all
> do something like this in an __init__.py (with unimportant variations):
> 
>   __import__('pkg_resources').declare_namespace(__name__)
> 
> As
> https://packaging.python.org/en/latest/guides/packaging-namespace-packages/#pkg-resources-style-namespace-packages
> says:
> 
>   If you are creating a new distribution within an existing namespace
>   package that uses this method then it’s recommended to continue using
>   this as the different methods are not cross-compatible and it’s not
>   advisable to try to migrate an existing package.
> 
> I know pkg_resources is deprecated for most other purposes, but even
> upstream currently advises here not to try to migrate in this case.
> Now, I know there've been some attempts to figure this out:
> https://github.com/pypa/sample-namespace-packages thinks a migration may
> be possible as long as developers are willing to accept some
> limitations.

mallard-ducktype (#1083471) is in a similar situation, although there don't
seem to be any third-party extensions to it packaged in Debian in practice,
so we might be able to get away with just deleting
/usr/lib/python3/dist-packages/mallard/ducktype/extensions/__init__.py and
hoping it doesn't break anything for unpackaged code.

I've asked upstream whether they are aware of third-party extensions that
are not packaged in Debian. I'm not intending to work on this further in
mallard-ducktype until there is an obvious correct thing to do.

Thanks,
    smcv

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Bug#1083471: Migrating away from pkg_resources is difficult for namespace packages Simon McVittie <smcv@debian.org> - 2024-10-04 15:40 +0200

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