bug#2631: get-free-disk-space when default-directory doesn't exist

[Eli Zaretskii <eliz@gnu.org>]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Tue, 10 Mar 2009 22:10:13 -0400
> Cc: bug-gnu-emacs@gnu.org, 2631@emacsbugs.donarmstrong.com
> 
> > *** files.el	11 Mar 2009 08:46:04 +1100	1.1038
> > --- files.el	11 Mar 2009 09:14:14 +1100	
> > ***************
> > *** 5336,5345 ****
> >         (save-match-data
> >   	(with-temp-buffer
> >   	  (when (and directory-free-space-program
> > ! 		     (eq 0 (call-process directory-free-space-program
> > ! 					 nil t nil
> > ! 					 directory-free-space-args
> > ! 					 dir)))
> >   	    ;; Usual format is a header line followed by a line of
> >   	    ;; numbers.
> >   	    (goto-char (point-min))
> > --- 5336,5346 ----
> >         (save-match-data
> >   	(with-temp-buffer
> >   	  (when (and directory-free-space-program
> > !                      (let ((default-directory "/"))
> > !                        (eq 0 (call-process directory-free-space-program
> > !                                            nil t nil
> > !                                            directory-free-space-args
> > !                                            dir))))
> >   	    ;; Usual format is a header line followed by a line of
> >   	    ;; numbers.
> >   	    (goto-char (point-min))
> 
> That would probably work OK, but why not bind default-directory to dir?

Yes, this is much better, since "/" is not guaranteed to work
(accessibility and stuff).

> And even use process-file, while we're at it, so it has a chance to work
> on Tramp.

Even better.