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bug#30505: Starting console/terminal Unicode support

From: Ludovic Courtès
Subject: bug#30505: Starting console/terminal Unicode support
Date: Tue, 27 Feb 2018 10:25:36 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)


Danny Milosavljevic <address@hidden> skribis:

> On Mon, 26 Feb 2018 18:09:53 +0100
> address@hidden (Ludovic Courtès) wrote:
>>   1. status quo, i.e., tcsetattr without %G in the ‘term-ttyN’ services;
>>   2. remove the tcsetattr call, write “1” to
>>      /sys/module/vt/parameters/default_utf8;
>>   3. do nothing (no tcsetattr, no /sys, no %G).
>> It seems that systemd does everything: %G, tcsetattr, and /sys.
> We have the following options as a distribution:
> (a) Hope that the user sets up everything as he should - iff they set up 
> the kernel as non-utf8, they also must set up an non-utf-8 console font.
> (b) Force their hand by decreeing that GuixSD is utf-8 only.  That's what
> we are doing now I think - and a lot of projects (GNOME etc) assume UTF-8
> nowadays anyway.
> Since we just want to fix the bug and leave everything else as it is (b),
> I'd vote for your (2.).
> (2.) needs to be done early before the VTs are actually there.

OK, makes sense, I agree.

> default_utf8 is a default, and it will be read only when defaulting, so
> in this case it will be read when Linux is constructing a tty.
> %base-services contain both console-font-service and mingetty-service which
> both access the ttys.  Linux VTs are created on demand.
> Once the VTs are created, us setting default_utf8 is too late.
> We should set default_utf8 before anyone touches tty[123456].
> Where will that be?
> Should we just set it in boot-system ? That's probably a nice way -
> also since I think this setting is quite Linux-specific.

Alternately we could introduce a ‘virtual-terminal’ service that every
‘term-*’ service would depend on.  That ‘virtual-terminal’ service would
simply write “1” to /sys/…/default_utf8.

How does that sound?


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