bug#57562: [PATCH] * lisp/emacs-lisp/comp.el (comp-run-async-workers): Fail more gracefully

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: 57562@debbugs.gnu.org
> Date: Sat, 03 Sep 2022 15:16:23 -0400
> 
> > I guess that's enough for Emacs 28.  (And I do wonder how come people
> > come up with unwritable home directories.)
> 
> In the discussion of that Debian bug#1017739, Russ Allbery mentions
> a(n unrelated) problem which can lead to this:
> 
>     % su
>     # emacs
> 
> If the user hasn't yet used Emacs (and depending on the details of which
> version of `su` you use) this can create
> a /home/<user>/.emacs.d/eln-cache that's owned by root because we create
> that dir according to `~$USER` rather than according to `$HOME`.

I didn't mean to say that I didn't understand how this could happen
_technically_.  What I don't get is how come people let this happen,
and don't pay attention until Emacs complains?  Isn't it crazy to have
your home directory unwritable by your user??