On Feb 26, 2009, at 11:05 PM, Martin Wierschin wrote:
There *can't* be an API for it. Take the case of NFS. NFS has no
character set restrictions beyond the basics that apply to all
UNIXen.
But the underlying filesystem that the NFS server is writing things
to
may well have more restrictions.
The server has some way to talk to the drive, so I don't see why the
character restrictions couldn't be communicated and reported back
through the NFS API.
You could have an NFS server that serves files off a FAT32 drive,
for example.
Or a special NFS server that requires every third byte of a
filename to be an
even number.
I find it hard to accept that any file system would need such
complex validation rules. Is there some underlying reason for
dynamic validation? I know very little about file systems. Out of
curiosity, is there an exotic file system that does more than reject
a fixed set of characters?
One issue is that on Unix, there's a single file hierarchy. Various
file systems, drives, volumes, shares, what-have-you are mounted
_into_ this file hierarchy.
So, if you have an NFS share mounted, some parts of it may support one
file naming scheme while other parts support a different scheme.
That doesn't even require involving an NFS mount. It's true of the
local file hierarchy on your Mac. If you use an HFS+ boot drive but
mount a FAT32 volume, then you have a single hierarchy with different
rules in different parts.
On the other hand, it would be nice if there were an API with which
you could at least query the acceptable character set for a specific
part (directory). But this would require adding new support in
various file sharing protocols. You blithely say it could be reported
back through the NFS API, but that requires designing such an API,
getting it approved, getting it implemented, and getting it deployed
widely enough to matter. And then doing the same for SMB/CIFS, AFP,
WebDAV, etc.
Regards,
Ken
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