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<chapter xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="ch-releases">
<title>Releases</title>
<section xml:id="release-process">
<title>Release process</title>
<para>
Going through an example of releasing NixOS 17.09:
</para>
<section xml:id="one-month-before-the-beta">
<title>One month before the beta</title>
<itemizedlist spacing="compact">
<listitem>
<para>
Send an email to the nix-devel mailinglist as a warning about upcoming
beta "feature freeze" in a month.
</para>
</listitem>
<listitem>
<para>
Discuss with Eelco Dolstra and the community (via IRC, ML) about what
will reach the deadline. Any issue or Pull Request targeting the release
should be included in the release milestone.
</para>
</listitem>
</itemizedlist>
</section>
<section xml:id="at-beta-release-time">
<title>At beta release time</title>
<itemizedlist spacing="compact">
<listitem>
<para>
<link xlink:href="https://github.com/NixOS/nixpkgs/issues/13559">Create
an issue for tracking Zero Hydra Failures progress. ZHF is an effort to
get build failures down to zero.</link>
</para>
</listitem>
<listitem>
<para>
<literal>git tag -a -s -m &quot;Release 17.09-beta&quot; 17.09-beta
&amp;&amp; git push origin 17.09-beta</literal>
</para>
</listitem>
<listitem>
<para>
From the master branch run <literal>git checkout -b
release-17.09</literal>.
</para>
</listitem>
<listitem>
<para>
<link xlink:href="https://github.com/NixOS/nixos-org-configurations/pull/18">
Make sure a channel is created at http://nixos.org/channels/. </link>
</para>
</listitem>
<listitem>
<para>
<link xlink:href="https://github.com/NixOS/nixpkgs/compare/bdf161ed8d21...6b63c4616790">
Bump the <literal>system.defaultChannel</literal> attribute in
<literal>nixos/modules/misc/version.nix</literal> </link>
</para>
</listitem>
<listitem>
<para>
<link xlink:href="https://github.com/NixOS/nixpkgs/commit/d6b08acd1ccac0d9d502c4b635e00b04d3387f06">
Update <literal>versionSuffix</literal> in
<literal>nixos/release.nix</literal></link>, use
<literal>git rev-list --count 17.09-beta</literal>
to get the commit count.
</para>
</listitem>
<listitem>
<para>
<literal>echo -n &quot;18.03&quot; &gt; .version</literal> on master.
</para>
</listitem>
<listitem>
<para>
<link xlink:href="https://github.com/NixOS/nixpkgs/commit/b8a4095003e27659092892a4708bb3698231a842">
Pick a new name for the unstable branch. </link>
</para>
</listitem>
<listitem>
<para>
Create a new release notes file for the upcoming release + 1, in this
case <literal>rl-1803.xml</literal>.
</para>
</listitem>
<listitem>
<para>
Create two Hydra jobsets: release-17.09 and release-17.09-small with
<literal>stableBranch</literal> set to false.
</para>
</listitem>
<listitem>
<para>
Remove attributes that we know we will not be able to support,
especially if there is a stable alternative. E.g. Check that our
Linux kernels'
<link xlink:href="https://www.kernel.org/category/releases.html">
projected end-of-life</link> are after our release projected
end-of-life
</para>
</listitem>
<listitem>
<para>
Edit changelog at
<literal>nixos/doc/manual/release-notes/rl-1709.xml</literal> (double
check desktop versions are noted)
</para>
<itemizedlist spacing="compact">
<listitem>
<para>
Get all new NixOS modules <literal>git diff
release-17.03..release-17.09 nixos/modules/module-list.nix|grep
^+</literal>
</para>
</listitem>
<listitem>
<para>
Note systemd, kernel, glibc and Nix upgrades.
</para>
</listitem>
</itemizedlist>
</listitem>
</itemizedlist>
</section>
<section xml:id="during-beta">
<title>During Beta</title>
<itemizedlist spacing="compact">
<listitem>
<para>
Monitor the master branch for bugfixes and minor updates and cherry-pick
them to the release branch.
</para>
</listitem>
</itemizedlist>
</section>
<section xml:id="before-the-final-release">
<title>Before the final release</title>
<itemizedlist spacing="compact">
<listitem>
<para>
Re-check that the release notes are complete.
</para>
</listitem>
<listitem>
<para>
Release Nix (currently only Eelco Dolstra can do that).
<link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/installer/tools/nix-fallback-paths.nix">
Make sure fallback is updated. </link>
</para>
</listitem>
<listitem>
<para>
<link xlink:href="https://github.com/NixOS/nixpkgs/commit/40fd9ae3ac8048758abdcfc7d28a78b5f22fe97e">
Update README.md with new stable NixOS version information. </link>
</para>
</listitem>
<listitem>
<para>
Change <literal>stableBranch</literal> to <literal>true</literal> in Hydra and wait for
the channel to update.
</para>
</listitem>
</itemizedlist>
</section>
<section xml:id="at-final-release-time">
<title>At final release time</title>
<itemizedlist spacing="compact">
<listitem>
<para>
<literal>git tag -s -a -m &quot;Release 15.09&quot; 15.09</literal>
</para>
</listitem>
<listitem>
<para>
Update "Chapter 4. Upgrading NixOS" section of the manual to match
new stable release version.
</para>
</listitem>
<listitem>
<para>
Update the
<link xlink:href="https://github.com/NixOS/nixos-homepage/commit/2a37975d5a617ecdfca94696242b6f32ffcba9f1"><code>NIXOS_SERIES</code></link>
in the
<link xlink:href="https://github.com/NixOS/nixos-homepage">nixos-homepage</link>
repository.
</para>
</listitem>
<listitem>
<para>
Get number of commits for the release: <literal>git log
release-14.04..release-14.12 --format=%an|wc -l</literal>
</para>
</listitem>
<listitem>
<para>
Commits by contributor: <literal>git log release-14.04..release-14.12
--format=%an|sort|uniq -c|sort -rn</literal>
</para>
</listitem>
<listitem>
<para>
Create a new topic on <link xlink:href="https://discourse.nixos.org/">the
Discourse instance</link> to announce the release with the above information.
Best to check how previous email was formulated to see what needs to be
included.
</para>
</listitem>
</itemizedlist>
</section>
</section>
<section xml:id="release-managers">
<title>Release Management Team</title>
<para>
For each release there are two release managers. After each release the
release manager having managed two releases steps down and the release
management team of the last release appoints a new release manager.
</para>
<para>
This makes sure a release management team always consists of one release
manager who already has managed one release and one release manager being
introduced to their role, making it easier to pass on knowledge and
experience.
</para>
<para>
Release managers for the current NixOS release are tracked by GitHub team
<link xlink:href="https://github.com/orgs/NixOS/teams/nixos-release-managers/members"><literal>@NixOS/nixos-release-managers</literal></link>.
</para>
<para>
A release manager's role and responsibilities are:
</para>
<itemizedlist>
<listitem><para>manage the release process</para></listitem>
<listitem><para>start discussions about features and changes for a given release</para></listitem>
<listitem><para>create a roadmap</para></listitem>
<listitem><para>release in cooperation with Eelco Dolstra</para></listitem>
<listitem><para>decide which bug fixes, features, etc... get backported after a release</para></listitem>
</itemizedlist>
</section>
<section xml:id="release-schedule">
<title>Release schedule</title>
<informaltable>
<tgroup cols="2">
<colspec align="left" />
<colspec align="left" />
<thead>
<row>
<entry>
Date
</entry>
<entry>
Event
</entry>
</row>
</thead>
<tbody>
<row>
<entry>
2016-07-25
</entry>
<entry>
Send email to nix-dev about upcoming branch-off
</entry>
</row>
<row>
<entry>
2016-09-01
</entry>
<entry><literal>release-16.09</literal> branch and corresponding jobsets are created,
change freeze
</entry>
</row>
<row>
<entry>
2016-09-30
</entry>
<entry>
NixOS 16.09 released
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</section>
</chapter>