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* Contingency mechanism: If absolutely needed, the change owners will add compatibility {{package|python2-sphinx}} package with Sphinx 1.8.x but they are not willing to maintain it, so they plan to orphan it soon after Fedora 31 is released. <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
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== Documentation ==
== Documentation ==

Revision as of 18:31, 6 February 2019


Update Sphinx to version 2 and drop Python 2 support from Sphinx

Summary

The version 2.0.x of Sphinx, popular Python documentation generator and framework, is expected to be released in early 2019. It drops support for Python 2. As part of Finalizing Fedora's Switch to Python 3, we update Package-x-generic-16.pngpython-sphinx to 2.0.x and we drop Package-x-generic-16.pngpython2-sphinx and related packages from Fedora 31 and further.

Package maintainers using Sphinx on Python 2 have three options:

  • they stop using Python 2 entirely (preferred), dropping their python2 subpackages if not dependent upon by other packages,
  • they switch to Sphinx on Python 3 for building their documentation,
  • they stop building documentation.

Packages that use Sphinx on Python 2 on runtime are Sphinx extensions, themes etc. and will be removed together with Package-x-generic-16.pngpython2-sphinx.

Owner

Current status

  • Targeted release: Fedora 31
  • Last updated: 2019-02-06
  • Tracker bug: <will be assigned by the Wrangler>

Detailed Description

See live (or several days old) information of Python dependents of Template:Python2-sphinx at the Python 2 Dropping Database.

We will remove the following (sub)packages:

The following (source) packages currently (2019-02-06) BuildRequire any of the above and will need to be adapted to stop doing that:

As said in the summary, packages will either switch to Python 3 Sphinx or stop building the docs. Change owners can provide guidance and help yet they are not expected to do all the work here.

The following tools will be switched to Python 3:

  • /usr/bin/sphinx-apidoc
  • /usr/bin/sphinx-autogen
  • /usr/bin/sphinx-build
  • /usr/bin/sphinx-quickstart

Their -3 and -3.X suffixed counterparts will be kept as symbolic links for backwards compatibility.

Benefit to Fedora

Fedora is the leading environment for Python development and will include the newest and nicest Sphinx for users and packagers. The removal of Python 2 Sphinx will help getting rid of significant Python 2 usage, as Fedora long term plan is to get rid of this legacy interpreter. Python 2 is deprecated in Fedora and its upstream support ends at 2020-01-01, very early in the Fedora 31 life time.

Scope

  • Proposal owners: remove packages as described above as soon as possible, update Package-x-generic-16.pngpython-sphinx to 2.0.0 or newer, provide guidance and help.
  • Other developers: stop using Package-x-generic-16.pngpython2-sphinx (list of packages in description)
  • Policies and guidelines: none
  • Trademark approval: not needed for this Change

Upgrade/compatibility impact

The new Package-x-generic-16.pngpython3-sphinx package will have to conflict with the old Package-x-generic-16.pngpython2-sphinx package. Proper obsoletes will be added.

Fedora users using RPM packaged Sphinx will use Sphinx on Python 3 by default, as many would expect. Fedora users still needing to use Python 2 and Sphinx will use Python virtual environment and pip.

How To Test

TBD

User Experience

Already covered by sections above.

Dependencies

Described by the sections above.

Contingency Plan

  • Contingency mechanism: If absolutely needed, the change owners will add compatibility Package-x-generic-16.pngpython2-sphinx package with Sphinx 1.8.x but they are not willing to maintain it, so they plan to orphan it soon after Fedora 31 is released.
  • Contingency deadline: any time before release
  • Blocks release? No
  • Blocks product? No

Documentation

N/A (not a System Wide Change)

Release Notes