linux-kernel - [PATCH] changes.rst: explain the usage of virtual environment

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Date:   Mon, 19 Jun 2017 08:24:10 -0300
From:   Mauro Carvalho Chehab <mchehab@...pensource.com>
To:     Linux Doc Mailing List <linux-doc@...r.kernel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Mauro Carvalho Chehab <mchehab@...radead.org>,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        SeongJae Park <sj38.park@...il.com>,
        Markus Heiser <markus.heiser@...marit.de>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH] changes.rst: explain the usage of virtual environment

As the Sphinx build seems very fragile, specially for
PDF output, add a notice about how to use it on a virtual
environment.

Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
---

 Documentation/process/changes.rst | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
index 3aed751e0cb5..8a51f37bce4a 100644
--- a/Documentation/process/changes.rst
+++ b/Documentation/process/changes.rst
@@ -322,6 +322,24 @@ PDF outputs, it is recommended to use version 1.4.6.
   functionalities required for ``XeLaTex`` to work. For PDF output you'll also
   need ``convert(1)`` from ImageMagick (https://www.imagemagick.org).
 
+Most distributions are shipped with Sphinx, but sometimes you may need
+to use a version different than the one shipped. For those cases, you
+can use Sphinx on a virtual environment. For example, if you want to
+install the Python 3 Sphinx version 1.4.9, do::
+
+       $ virtualenv-3 sphinx_1.4
+       $ . sphinx_1.4/bin/activate
+       $ pip install 'Sphinx==1.4.9'
+
+.. note::
+
+   #) It is recommended to use the RTD theme for html output. Depending
+      on the version, it should be installed  in separate,
+      with ``pip install sphinx_rtd_theme``.
+
+   #) The command ``. sphinx_1.4/bin/activate`` sets the environment to
+      use the virtual environment you just install. It should be called
+      when you start a new shell, before running ``make htmldocs``.
 
 Getting updated software
 ========================
-- 
2.9.4