linux-kernel - Re: [PATCH 0/5] Add a script to check for Sphinx install requirements

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Date:   Mon, 17 Jul 2017 07:09:46 -0300
From:   Mauro Carvalho Chehab <mchehab@...pensource.com>
To:     Markus Heiser <markus.heiser@...marit.de>
Cc:     Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...radead.org>,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        SeongJae Park <sj38.park@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH 0/5] Add a script to check for Sphinx install
 requirements

Em Mon, 17 Jul 2017 06:33:03 -0300
Mauro Carvalho Chehab <mchehab@...pensource.com> escreveu:

> Em Mon, 17 Jul 2017 10:15:26 +0200
> Markus Heiser <markus.heiser@...marit.de> escreveu:
> 
> > > Am 17.07.2017 um 00:08 schrieb Mauro Carvalho Chehab <mchehab@...pensource.com>:
> > > 
> > > [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. 
> > >     
> > 
> > Hmm .. http://www.graphviz.org/content/output-formats#dpdf
> > 
> > Is it a problem of the GraphViz version?
> > 
> > See http://www.graphviz.org/News.php ..
> > 
> >   """New Release 2.32 (1 August 2013)
> > 
> >      ... In addition, if the poppler library is available, Graphviz
> >      can now use PDF files as images."""
> > 
> > I suppose that 2.32 is in your distro .. it's from 2013  
> 
> Fedora 26 is shipped with version 2.40:
> 
> 	$ rpm -q graphviz
> 	graphviz-2.40.1-4.fc26.x86_64
> 
> Yet:
> 
> $ dot -Thelp|grep pdf
> Format: "help" not recognized. Use one of: canon cmap cmapx cmapx_np dot dot_json eps fig gv imap imap_np ismap json json0 mp pic plain plain-ext pov ps ps2 svg svgz tk vdx vml vmlz xdot xdot1.2 xdot1.4 xdot_json
> 
> I actually noticed this issue first on OpenSuse, where GraphViz is
> packaged on several packages, but I was unable to find one package
> there with pdf suport. I'm pretty sure pdf used to work on F25.
> 
> > 
> > It seems, that the graphiz homepage is not up to date. I found 
> > the repo at github. There is a issue about PDF
> > 
> >   https://github.com/ellson/graphviz/issues/1180
> > 
> > So I guess graphviz is compiled without HAVE_PANGOCAIRO in your
> > distros?  
> 
> 
> From Fedora source package, it is requiring both cairo and pango:
> 
> 	BuildRequires:		cairo-devel >= 1.1.10, pango-devel, gmp-devel, lua-devel, gtk2-devel, libgnomeui-devel
> 
> Building it gets:
> 
> 	checking for PANGOCAIRO... yes
> 
> Still, no PDF support. I'll try to investigate it further, as I
> found myself useful to produce PDF directly from GraphViz.
> 
> Anyway, I guess we should modify kfigure.py to check if PDF is
> available, falling back to SVG, using ImageMagick to convert
> from SVG to PDF.

Ok, I discovered that, on Fedora, support for pdf, png and some other
formats are packaged on a separate package: graphviz-gd.x86_64

With it installed, it now shows "pdf":

$ dot -Thelp
Format: "help" not recognized. Use one of: bmp canon cmap cmapx cmapx_np dot dot_json eps fig gd gd2 gif gtk gv ico imap imap_np ismap jpe jpeg jpg json json0 mp pdf pic plain plain-ext png pov ps ps2 svg svgz tif tiff tk vdx vml vmlz vrml wbmp x11 xdot xdot1.2 xdot1.4 xdot_json xlib

Thanks,
Mauro