Extended attributes in MacOS X

Victor Shoup shoup at cs.nyu.edu
Thu Oct 26 09:58:45 GMT 2006

I'm glad to see rsync may finally be getting proper support for  
extended attributes
on OSX (since apple's own implementation of this is notoriously buggy).
I'm wondering, though:  does the xattr code avoid copying, or even  
hashes of, the xattr data itself?  Especially on OSX there can be a  
lot of this stuff,
and it would be nice if changes in the xattr's were detected quickly  
by looking at something like
modtime and filesize, just like for regular files.  I don't even know  
if this is possible,
as this data may not even be available for xattr's.

   -- Victor

On Oct 25, 2006, at 10:01 PM, Wayne Davison wrote:

> On Wed, Oct 25, 2006 at 09:10:46PM +0200, Wesley W. Terpstra wrote:
>> I've attached the patch. You need to apply acls.diff and xattr.diff
>> first, and run autoconf/autoheader after.
> Great!  I've taken your code, tweaked it a little, and then did some
> bug-fixing of the xattr code in general (I found some buffer problems
> quickly using valgrind).  The end result is now in CVS and in the most
> recent "nightly" tar file (see the download page of the website).
> The OS X version transmits a unique prefix of "user.0S%." for any
> attribute name that doesn't start with "user." or "system.".  It also
> strips this prefix when received.  This should make the code interact
> well with Linux/Un*x systems.  Please try it out and let me know if
> you find any problems.
> ..wayne..
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