Re: set-file-extended-attributes and backups

[Eli Zaretskii <eliz@gnu.org>]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: romain@orebokech.com,  eggert@cs.ucla.edu,  emacs-devel@gnu.org
> Date: Mon, 24 Dec 2012 00:18:59 -0500
> 
> > ENOTSUP usually means the filesystem doesn't support ACLs.  Having an
> > error that every single use of it will want to ignore doesn't seem to
> > be useful.
> 
> But if the FS doesn't support ACL, then file-acl should have returned
> nil, so we don't need to call set-file-acl at all.

What about copying files from one FS to another?  Like from the DoK to
your local disk or vice versa?

> IOW, those errors should not be frequent.

Frequency is immaterial here, IMO.  If, when the error happens, we
will always want to ignore it, then raising it is not useful.
Especially that we would need to invent yet another kind of error to
distinguish a not-supported error from something-else-wrong error.