Re: [gentoo-dev] [PATCH] distutils-r1.eclass: Warn if *-nspkg.pth files are installed

[M. J. Everitt]

On 05/05/17 22:14, Michał Górny wrote:
> Add a check for *-nspkg.pth files indicating implicit setuptools
> namespace hack. While they kept namespaces somewhat working without
> requiring explicit support in ebuilds, they were unreliable. They
> frequently required additional hacks (distutils_install_for_testing) to
> get the tests working, and they have proven even more broken for Python
> 3.5+.
>
> For this reason, those files were deprecated in favor of proper,
> explicit namespace support. If they are found to exist, the developer
> should ensure to remove them to avoid issues.
> ---
>  eclass/distutils-r1.eclass | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>
> **REVIEW NOTE**
>
> The wiki documentation update is not yet in place for the new policy
> is not yet in place. In fact, it's not even guaranteed that the policy
> will actually be approved. The discussion is taking place here:

The wiki documentation update is not yet in place for the new policy
is not yet in place. ???

Copy-pasta, sir .. :]

> https://archives.gentoo.org/gentoo-python/message/d74af64a795cb776ac7b4f285963072d
>
> diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
> index 3be67bbf2a21..5df7234332d3 100644
> --- a/eclass/distutils-r1.eclass
> +++ b/eclass/distutils-r1.eclass
> @@ -789,6 +789,33 @@ distutils-r1_src_test() {
>  	fi
>  }
>
> +# @FUNCTION: _distutils-r1_check_namespace_pth
> +# @INTERNAL
> +# @DESCRIPTION:
> +# Check if any *-nspkg.pth files were installed (by setuptools)
> +# and warn about the policy non-conformance if they were.
> +_distutils-r1_check_namespace_pth() {
> +	local f pth=()
> +
> +	while IFS= read -r -d '' f; do
> +		pth+=( "${f}" )
> +	done < <(find "${ED}" -name '*-nspkg.pth' -print0)
> +
> +	if [[ ${pth[@]} ]]; then
> +		ewarn "The following *-nspkg.pth files were found installed:"
> +		ewarn
> +		for f in "${pth[@]}"; do
> +			ewarn "  ${f#${ED%/}}"
> +		done
> +		ewarn
> +		ewarn "The presence of those files may break namespaces in Python 3.5+. Please"
> +		ewarn "read our documentation on reliable handling of namespaces and update"
> +		ewarn "the ebuild accordingly:"
> +		ewarn
> +		ewarn "  https://wiki.gentoo.org/wiki/Project:Python/Namespace_packages"
> +	fi
> +}
> +
>  distutils-r1_src_install() {
>  	debug-print-function ${FUNCNAME} "${@}"
>
> @@ -812,6 +839,8 @@ distutils-r1_src_install() {
>
>  		"${cmd}" "QA: python_install_all() didn't call distutils-r1_python_install_all"
>  	fi
> +
> +	_distutils-r1_check_namespace_pth
>  }
>
>  # -- distutils.eclass functions --