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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Appendix C. Upgrade Procedure</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="index.html" title="Debian Python Policy" /><link rel="up" href="index.html" title="Debian Python Policy" /><link rel="prev" href="packaging_tools.html" title="Appendix B. Packaging Tools" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Appendix C. Upgrade Procedure</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="packaging_tools.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> </td></tr></table><hr /></div><div class="appendix"><div class="titlepage"><div><div><h1 class="title"><a id="upgrade"></a>Appendix C. Upgrade Procedure</h1></div></div></div><p>
This section describes the procedure for the upgrade when the
default Python version is changed in the Debian <code class="literal">unstable</code>
release, requiring recompilation of many Python-related packages.
</p><p>
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>
Selected pre-releases and release candidates of new Python
versions are uploaded to Debian <code class="literal">experimental</code> to
support pre-transition work and testing.
</p></li><li class="listitem"><p>
Application and module maintainers make sourceful changes
where needed to prepare for the new Python version when
needed.
</p></li><li class="listitem"><p>
Have a long and heated discussion.
</p></li><li class="listitem"><p>
The Debian Python maintainer and module/application
maintainers discuss the readiness for a new default Debian
Python version and associated packaging/policy changes. Once
there is some consensus, the Python maintainer announces the
upgrade and uploads to <code class="literal">unstable</code>.
</p></li><li class="listitem"><p>
Upload of the Python core meta-packages <code class="literal">python3</code>,
<code class="literal">python3-dev</code>, <code class="literal">python3-doc</code> and
several <code class="literal">python3-<em class="replaceable"><code>module</code></em></code>, depending on
the new <code class="literal">python3<em class="replaceable"><code>X</code></em>.<em class="replaceable"><code>Y</code></em></code>,
<code class="literal">python<em class="replaceable"><code>X</code></em>.<em class="replaceable"><code>Y</code></em>-dev</code> and so on.
</p></li><li class="listitem"><p>
The Debian release team schedules rebuilds for packages that
may need it. Packages that require additional manual work get
updated and uploaded.
</p></li></ol></div><p>
</p><p>
The necessary package builds are typcially done in three phases in
order to keep transitions as smooth as possible. For Python 3, there
is no general need to update architecture all packages for a new
Python 3 version. Only architecture any packages need to be rebuilt.
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>
The new Python 3 version is added to supported versions and
packages that support multiple Python 3 versions are binNMUed.
They now support both the new and older Python 3 versions.
This requires transition assistance from the release team in
the form of a transition tracker and binNMU scheduling, but is
not a transition that can cause entanglements with other
transitions in Debian.
</p></li><li class="listitem"><p>
Once the default Python 3 version is changed, binNMUs are done
for packages that only support one Python 3 version. Some
transient uninstallability is unavoidable. This is a
transition that can entangle other transitions in Debian and
requires more careful coordination with the release team.
</p></li><li class="listitem"><p>
After the old Python 3 version is dropped from supported
versions then packages with multi-version support are binNMUed
again to remove support for the old Python 3 version. This is
not a true transition and only needs a tracker and binNMU
scheduling.
</p></li></ol></div><p>
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