[PATCH 0/5] Add a script to check for Sphinx install requirements

[Mauro Carvalho Chehab <mchehab@s-opensource.com>]

Sphinx installation is not trivial, as not all versions are supported,
and it requires a lot of stuff for math, images and PDF/LaTeX output
to work.

So, add a script that checks if everything is fine, providing
distro-specific hints about what's needed for it to work.

I posted already RFC patches for the first patch in this series along
this weekend at linux-doc ML. The current version of the script
will provide hints for some popular distributions. I tested myself
on a couple of release-based and rolling popular distributions:

            - Fedora 25 and 26;
            - Ubuntu 17.04;
            - OpenSuse Tumbleweed;
            - Arch Linux;
            - Gentoo.

I tested compilation with both htmldocs and pdfdocs targets[1].
Yet, tests (and fix patches) are welcomed :-)

[1] There's an unrelated bug with the Kernel's sphinx extension
kimage: when parsing GraphViz graphs, it uses "-Tpdf" argument,
in order to generate a PDF image. That doesn't work on some
distros, as GraphViz doesn't support PDF images. 

Mauro Carvalho Chehab (5):
  scripts/sphinx-pre-install: add a script to check Sphinx install
  sphinx-pre-install: detect an existing virtualenv
  sphinx-pre-install: use a requirements file
  sphinx.rst: document scripts/sphinx-pre-install script
  doc: Makefile: if sphinx is not found, run a check script

 Documentation/Makefile             |   2 +
 Documentation/doc-guide/sphinx.rst |  48 +++-
 scripts/sphinx-pre-install         | 524 +++++++++++++++++++++++++++++++++++++
 3 files changed, 570 insertions(+), 4 deletions(-)
 create mode 100755 scripts/sphinx-pre-install

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2.13.3