docs/releasing.rst

Releasing Process
=================

Overview
--------

This document uses the convention X.Y.Z for the release number with X.Y
being the stable branch name.

Mesa provides feature and bugfix releases. Former use zero as patch
version (Z), while the latter have a non-zero one.

For example:

::

   Mesa 10.1.0 - 10.1 branch, feature
   Mesa 10.1.4 - 10.1 branch, bugfix
   Mesa 12.0.0 - 12.0 branch, feature
   Mesa 12.0.2 - 12.0 branch, bugfix

.. _schedule:

Release schedule
----------------

Releases should happen on Wednesdays. Delays can occur although those
should be kept to a minimum.

See our :doc:`calendar <release-calendar>` for information about how
the release schedule is planned, and the date and other details for
individual releases.

Feature releases
~~~~~~~~~~~~~~~~

-  Available approximately every three months.
-  Feature releases are branched on or around the second Wednesday of
   January, April, July, and October.
-  Initial time plan available 2-4 weeks before the planned branchpoint
   (rc1) on the mesa-announce@ mailing list.
-  Typically, the final release will happen after 4 candidates.
   Additional ones may be needed in order to resolve blocking
   regressions, though.

Stable releases
~~~~~~~~~~~~~~~

-  Normally available once every two weeks.
-  Only the latest branch has releases. See note below.

.. note::

   There is one or two releases overlap when changing branches. For
   example:

   The final release from the 12.0 series Mesa 12.0.5 will be out around
   the same time (or shortly after) 13.0.1 is out.

   This also involves that, as a final release may be delayed due to the
   need of additional candidates to solve some blocking regression(s), the
   release manager might have to update the
   :doc:`calendar <release-calendar>` with additional bug fix releases of
   the current stable branch.

.. _pickntest:

Cherry-picking and testing
--------------------------

Commits nominated for the active branch are picked as based on the
:ref:`criteria <criteria>` as described in the same
section.

Nominations happen via special tags in the commit messages, and via
GitLab merge requests against the staging branches. There are special
scripts used to read the tags.

The maintainer should watch or be in contact with the Intel CI team, as
well as watch the GitLab CI for regressions.

Cherry picking should be done with the '-x' switch (to automatically add
"cherry picked from ..." to the commit message):

``git cherry-pick -x abcdef12345667890``

Developers can request, *as an exception*, patches to be applied up-to
the last one hour before the actual release. This is made **only** with
explicit permission/request, and the patch **must** be very well
contained. Thus it cannot affect more than one driver/subsystem.

Following developers have requested permanent exception

-  *Ilia Mirkin*
-  *AMD team*

The GitLab CI must pass.

For Windows related changes, the main contact point is Brian Paul. Jose
Fonseca can also help as a fallback contact.

For Android related changes, the main contact is Tapani Pälli. Mauro
Rossi is collaborating with Android-x86 and may provide feedback about
the build status in that project.

For MacOSX related changes, Jeremy Huddleston Sequoia is currently a
good contact point.

.. note::

   If a patch in the current queue needs any additional fix(es),
   then they should be squashed together. The commit messages and the
   "``cherry picked from``"-tags must be preserved.

   .. code-block:: text

      git show b10859ec41d09c57663a258f43fe57c12332698e

      commit b10859ec41d09c57663a258f43fe57c12332698e
      Author: Jonas Pfeil <pfeiljonas@gmx.de>
      Date:   Wed Mar 1 18:11:10 2017 +0100

         ralloc: Make sure ralloc() allocations match malloc()'s alignment.

         The header of ralloc needs to be aligned, because the compiler assumes
         ...

         (cherry picked from commit cd2b55e536dc806f9358f71db438dd9c246cdb14)

         Squashed with commit:

         ralloc: don't leave out the alignment factor

         Experimentation shows that without alignment factor GCC and Clang choose
         ...

         (cherry picked from commit ff494fe999510ea40e3ed5827e7818550b6de126)

Regression/functionality testing
--------------------------------

-  *no regressions should be observed for Piglit/dEQP/CTS/Vulkan on
   Intel platforms*
-  *no regressions should be observed for Piglit using the Softpipe
   and LLVMpipe drivers*

.. _stagingbranch:

Staging branch
--------------

A live branch, which contains the currently merge/rejected patches is
available in the main repository under ``staging/X.Y``. For example:

::

   staging/18.1 - WIP branch for the 18.1 series
   staging/18.2 - WIP branch for the 18.2 series

Notes:

-  People are encouraged to test the staging branch and report
   regressions.
-  The branch history is not stable and it **will** be rebased,

Making a branchpoint
--------------------

A branchpoint is made such that new development can continue in parallel
to stabilization and bugfixing.

.. note::

   Before doing a branch ensure that basic build and ``meson test``
   testing is done and there are little to-no issues. Ideally all of those
   should be tackled already.

Setup the branchpoint:

.. code-block:: sh

   # Make sure main can carry on at the new version
   $EDITOR VERSION # bump the version number, keeping in mind the wrap around at the end of the year
   git commit -asm 'VERSION: bump to X.(Y+1)'
   truncate -s0 docs/relnotes/new_features.txt
   git commit -asm 'docs: reset new_features.txt'
   git push YOUR_FORK

Make a merge request with what you just pushed, and assign it straight
to ``@Marge-bot``. Keep an eye on it, as you'll need to wait for it to
be merged.

Once it has been merged, note the last commit *before* your "VERSION:
bump to X.Y" as this is the branchpoint. This is ``$LAST_COMMIT`` in the
command below:

.. code-block:: sh

   VERSION=X.Y

   git tag -s $VERSION-branchpoint -m "Mesa $VERSION branchpoint" $LAST_COMMIT

   # Double-check that you tagged the correct commit
   git show $VERSION-branchpoint

Now that we have an official branchpoint, let's push the tag and create
the branches:

.. code-block:: sh

   git push origin $VERSION-branchpoint
   git checkout $VERSION-branchpoint
   git push origin HEAD:refs/heads/$VERSION
   git push origin HEAD:refs/heads/staging/$VERSION --push-option ci.skip
   git checkout staging/$VERSION
   git branch --set-upstream-to origin/staging/$VERSION

You are now on the :ref:`staging branch <stagingbranch>`, where you
will be doing your release maintainer work. This branch can be rebased
and altered in way necessary, with the caveat that anything pushed to
the ``X.Y`` branch must not be altered anymore. A convenient command
to perform an interactive rebase over everything since the last release is:

.. code-block:: sh

   git rebase -i mesa-$(cat VERSION)

Now go to
`GitLab <https://gitlab.freedesktop.org/mesa/mesa/-/milestones>`__ and
add the new Mesa version X.Y.

Check that there are no distribution breaking changes and revert them if
needed. For example: files being overwritten on install, etc. Happens
extremely rarely - we had only one case so far (see commit
2ced8eb136528914e1bf4e000dea06a9d53c7e04).

Making a new release
--------------------

These are the instructions for making a new Mesa release.

Get latest source files
~~~~~~~~~~~~~~~~~~~~~~~

Ensure the latest code is available - both in your local main and the
relevant branch.


Merge the staging branch into the release branch
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This allows the CI to be run against the proposed patches while they are still
on the ``staging/X.Y`` branch, and can be force pushed.

Create a new Merge Request, with ``staging/X.Y`` targeting the ``X.Y`` branch.
Be sure to rename the merge request, something like ``merge staging/X.Y in to
X.Y for the X.Y.Z release``. Ensure that ``delete source branch`` is **not**
checked, and set the label to ``release-maintainer`` and ``mesa-release``.
(this prevents the auto-labeller from running on this MR, which would otherwise
spam labels which a dev who watches those probably doesn't care about).
Assign to ``@marge-bot`` immediately.


Create release notes for the new release
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The release notes are completely generated by the
``bin/gen_release_notes.py`` script. Simply run this script **before**
bumping the version. You'll need to come back to this file once the
tarball is generated to add its SHA256 checksum.

Increment the version contained in the file ``VERSION`` at Mesa's top-level,
then commit this change and **push the branch** (if you forget to do
this, ``release.sh`` below will fail).

Use the release.sh script from X.Org `util-modular <https://gitlab.freedesktop.org/xorg/util/modular>`__
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Start the release process.

.. code-block:: sh

   ../relative/path/to/release.sh . # append --dist if you've already done distcheck above

Pay close attention to the prompts as you might be required to enter
your GPG and SSH passphrase(s) to sign and upload the files,
respectively.

Ensure that you do sign the tarballs, that your key is mentioned in the
release notes, and is published in `release-maintainers-keys.asc
<release-maintainers-keys.asc>`__.


Add the SHA256 checksums to the release notes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Edit ``docs/relnotes/X.Y.Z.rst`` to add the SHA256 checksums as available
in the ``mesa-X.Y.Z.announce`` template. Commit this change.

Don't forget to push the commits to both the ``staging/X.Y`` branch and
the ``X.Y`` branch:

.. code-block:: sh

   git push origin HEAD:staging/X.Y
   git push origin HEAD:X.Y


Create a new branch against main for the release notes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Something like the following steps will do the trick:

.. code-block:: sh

   git checkout -b X.Y-release
   git cherry-pick -x X.Y~2
   git cherry-pick -x X.Y

Then run the

.. code-block:: sh

   ./bin/post_version.py X.Y.Z

, where X.Y.Z is the version you just made. This will update
docs/relnotes.rst and docs/release-calendar.csv. It will then generate
a Git commit automatically. Check that everything looks correct and
push:

.. code-block:: sh

      git push -u YOUR_FORK X.Y-release

Finally, open a merge request against the main branch, assigning it to
``@marge-bot`` immediately.

Update the website
------------------

Create a fork of `Mesa3d.org <https://gitlab.freedesktop.org/mesa/mesa3d.org/>`__, and create
a new merge request using the script:

.. code-block:: sh

   git checkout -b X.Y-release
   ./post_release.py X.Y.Z
   git push -u YOUR_FORK X.Y-release

Where X.Y.Z is the same value as passed to post_version.py in the previous step.

Create a merge request from this commit. After the commit to mesa is merged,
merge this MR.

Announce the release
--------------------

Use the generated template during the releasing process.

Again, pay attention to add a note to warn about a final release in a
series, if that is the case.

Update GitLab issues
--------------------

Parse through the bug reports as listed in the docs/relnotes/X.Y.Z.rst
document. If there's outstanding action, close the bug referencing the
commit ID which addresses the bug and mention the Mesa version that has
the fix.

.. note: the above is not applicable to all the reports, so use common sense.