linux-kernel - Re: [PATCH v6 04/21] scripts: check-variable-fonts.sh: convert to Python

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Message-ID: <20250918105124.3728661a@foz.lan>
Date: Thu, 18 Sep 2025 10:51:28 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Akira Yokosawa <akiyks@...il.com>
Cc: corbet@....net, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 04/21] scripts: check-variable-fonts.sh: convert to
 Python

Em Thu, 18 Sep 2025 08:22:44 +0900
Akira Yokosawa <akiyks@...il.com> escreveu:

> Hi,
> 
> On Wed, 17 Sep 2025 10:48:18 +0200, Mauro Carvalho Chehab wrote:
> > Em Wed, 17 Sep 2025 10:09:05 +0900
> > Akira Yokosawa <akiyks@...il.com> escreveu:
> >   
> >> On Tue, 16 Sep 2025 12:22:40 +0200, Mauro Carvalho Chehab wrote:  
> >>> This script handle errors when trying to build translations
> >>> with make pdfdocs.
> >>>
> >>> As part of our cleanup work to remove hacks from docs Makefile,
> >>> convert this to python, preparing it to be part of a library
> >>> to be called by sphinx-build-wrapper.
> >>>
> >>> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>  
> >>
> >> I could apply up to 05/21 of v6 and did some quick tests under
> >> Fedora (where Noto CJK VF fonts are installed).
> >>
> >> At 3/21, "./scripts/check-variable-fonts.sh" doesn't say a word.
> >>
> >> At 4/21, "./scripts/check-variable-fonts.py" complains:  
> > 
> > I got a little bit confused with the above. I guess you picked the
> > wrong patch numbers, but yeah, there is a bisect issue, caused by
> > the part reorder I did moving this change to happen before adding
> > the script. Basically, I updated docs Makefile the wrong way.
> > 
> > Thanks for pointing it!
> > 
> > For v7 I'll ensure that all patches will properly print the suggestions
> > from the script.
> >   
> >> =============================================================================
> >> XeTeX is confused by "variable font" files listed below:
> >>     /usr/share/fonts/google-noto-sans-cjk-vf-fonts/NotoSansCJK-VF.ttc
> >>     /usr/share/fonts/google-noto-sans-mono-cjk-vf-fonts/NotoSansMonoCJK-VF.ttc
> >>     /usr/share/fonts/google-noto-serif-cjk-vf-fonts/NotoSerifCJK-VF.ttc
> >>
> >> For CJK pages in PDF, they need to be hidden from XeTeX by denylisting.
> >> Or, CJK pages can be skipped by uninstalling texlive-xecjk.
> >>
> >> For more info on denylisting, other options, and variable font, see header
> >> comments of scripts/check-variable-fonts.py.
> >> =============================================================================
> >>
> >> Of course, I have followed the suggestions in the header comments.  
> > 
> > I didn't try to follow the suggestions to solve the issue on Fedora yet.
> > It is on my todo list to test it.
> > 
> > The new script has an exact copy of the instructions of the previous one.
> > 
> > So, up to patch 09/21 from this series, there won't be any change at
> > doc build, except for the script conversion and some code cleanups
> > and reordering.
> > 
> > Patch 09/21 moves the env logic of FONTS_CONF_DENY_VF to the wrapper.
> > So, in thesis, fixing it before-after the series shouldn't have any
> > impact (I didn't test yet. Will do on my next respin). Btw, we should
> > probably document it at make help.
> > 
> > If the instructions from the header is wrong, we need to update it
> > on a separate patch series.
> >   
> 
> I have tested v7.
> 
> With v7 fully applied, it is now possible to build translations.pdf on
> Fedora.  Nice!
> 
> HOWEVER, running
> 
>     ./tools/docs/check-variable-fonts.py
> 
> still complains.  I'm not sure but there might be some minor issue (typo?)
> in the translation from .sh into .py ???
> 
> So I have to keep the NAK on v7's 7/24 ("scripts: check-variable-fonts.sh:
> convert to Python") for the moment.
> 
> Please run the script under a terminal session and see what happens ...

Yeah, there was a typo there. I fixed it for the next respin.

To better allow running it manually, I'm adding to the tool a new command
line argument:

	$ tools/docs/check-variable-fonts.py -h
	...
	options:
	  -h, --help         show this help message and exit
	  --deny-vf DENY_VF  XDG_CONFIG_HOME dir containing fontconfig/fonts.conf file

And changed the class __init__ logic to optionally use it:

    def __init__(self, deny_vf=None):
        if not deny_vf:
            deny_vf = os.environ.get('FONTS_CONF_DENY_VF', "~/deny-vf")

This way, it will keep using FONTS_CONF_DENY_VF (defaulting to ~/deny-vf),
yet allowing it to be overriden via command line:

	$ tools/docs/check-variable-fonts.py
	<no output>

	$ tools/docs/check-variable-fonts.py --deny-vf ~/deny-vf/
	<no output>

	$ tools/docs/check-variable-fonts.py --deny-vf ~/dont-deny-vf/
	=============================================================================
	XeTeX is confused by "variable font" files listed below:
	    /usr/share/fonts/google-noto-sans-cjk-vf-fonts/NotoSansCJK-VF.ttc
	    /usr/share/fonts/google-noto-sans-mono-cjk-vf-fonts/NotoSansMonoCJK-VF.ttc
	    /usr/share/fonts/google-noto-serif-cjk-vf-fonts/NotoSerifCJK-VF.ttc
	
	For CJK pages in PDF, they need to be hidden from XeTeX by denylisting.
	Or, CJK pages can be skipped by uninstalling texlive-xecjk.
	
	For more info on denylisting, other options, and variable font, run:
	
	    tools/docs/check-variable-fonts.py -h
	=============================================================================

Thanks,
Mauro