bug#6995: 24.0.50; get-free-disk-space doesn't return available space in dired

[Stefan Monnier]

> How about dropping the use of `df', at least on GNU/Linux?  It's IMO
> ridiculous to invoke an external program for a single system call.  I
> know that this system call is notoriously non-portable, and that doing
> in Emacs all that system-dependent stuff that `df' does is not a good
> idea.  But at least on the most popular free system (and perhaps on a
> few compatible ones) we could do it right without all that labor, and
> gain stability and reliability that depending on `df' will never
> achieve.

That would make a lot of sense, yes,


        Stefan