Re: JFS default behavior (was: UTF-8 in file systems? xfs/extfs/etc.)

[Robin Rosenberg]

On Friday 13 February 2004 19.31, Richard B. Johnson wrote:
> On Fri, 13 Feb 2004 viro@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx wrote:
> 
> > On Fri, Feb 13, 2004 at 07:06:46PM +0100, Nicolas Mailhot wrote:
> > > And as for the filename problems :
> > > - just mangle existing invalid filenames when a default encoding is
> > > agreed upon
> > > - refuse to write new files with invalid filenames just like you would
> > > with the few names forbidden in ascii - apps will learn to cope.
> >
> > What names forbidden in ASCII?
> 
> I think that all ASCII characters below 0x20 are forbidden in
> Unix file-names and others shown in the reference cited and
> "disapproved".
> 
> http://www.med.nyu.edu/rcr/rcr/nyu_vms/unixfileanddirectorynames.htm

That's not really a formal definition of what's allowed. It's a recommendation
for users on how to avoid detecting applications that cannot handle all file names,
i.e. buggy applications. Try 

	touch "$(/bin/ls -1|head)"

and you will find apps that can handle the nice filename and those that cannot. I'm
definitely not endorsing them and it would probably be wise to implement a system policy that
allows administrators to ban such names as they represent security holes and all sorts of
problems.

Some filesystems forbid these names, but unix doesn't.

-- robin
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