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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: set-file-extended-attributes and backups
Date: Sat, 22 Dec 2012 19:03:58 +0200
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Cc: fabrice.popineau@supelec.fr, emacs-devel@gnu.org
To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: emacs-devel@gnu.org,  Fabrice Popineau <fabrice.popineau@supelec.fr>
> Date: Sat, 22 Dec 2012 11:05:21 -0500
> 
> > +       (ignore-errors
> > +	 (set-file-extended-attributes to-name extended-attributes))))
>  
> I'd use something like with-demoted-errors instead.

What about the race condition pointed out by Paul?  Should we try
set-file-extended-attributes first, and fall back on set-file-modes if
that fails (after displaying a message)?