bug#71732: 30.0.50; [FR] xdg: provide an ability to create XDG directory, if it does not exist

[Eli Zaretskii <eliz@gnu.org>]

> From: Björn Bidar <bjorn.bidar@thaodan.de>
> Cc: Ihor Radchenko <yantar92@posteo.net>,  71732@debbugs.gnu.org
> Date: Mon, 24 Jun 2024 00:09:38 +0300
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Ihor Radchenko <yantar92@posteo.net>
> >> Cc: 71732@debbugs.gnu.org, bjorn.bidar@thaodan.de
> >> Date: Sun, 23 Jun 2024 11:42:47 +0000
> >> 
> >> Eli Zaretskii <eliz@gnu.org> writes:
> >> 
> >> According to
> >> https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html,
> >> 0700 permission is a part of XDG spec.
> >
> > I already explained that: we don't blindly follow any standards, and
> > this particular issue is up to the calling Lisp program.  xdg.el has
> > no business forcing permissions on the caller.
> 
> I guess the point was that the caller should follow XDG or the
> respective standard on non-xdg platforms and to at least advice in
> following those.
> Emacs should integrate into the target platform if possible saving files
> into the right directories should be something possible.
> 
> "Blindly" following xdg or the respective platform for generic modus
> does not sound like a wrong idea to me good defaults are valuable.

The purpose of xdg.el is to represent the XDG directories to Emacs.
It is then the job of the Lisp programs which use xdg.el to decide
whether they create a directory and which permissions to give it.