rsync - Aug 2004 - rsync to Mac OS X question

I'm am currently setting up a simple backup system using rsync. I am
backing up users home directories to a central backup machine, and then
exporting those backups via NFS back to their host machines.

I had this set up and working under Linux (kernel 2.4.21) but have since
decided to give Mac OS X a try, and moved the system over to a brand new
Xserve G5.

It was actually quite painless to do, and everything seems set (even
NFS!). 

I ran into a problem today when I tested the system for the first time.
I am rsyncing from a remote Linux host using the following options to
rsync: -avv --rsh="<ssh stuff here>" --exclude-from=<path to
exclude
file> --delete.

The problem is when the files are moved over to the Mac OS X server
their owner/group ids change.

For instance if I copy ~heller/ (uid: 500 gid: 500) to the Mac it
becomes uid: 504 gid: 504.

This isn't too big a problem, but it messes up security when I go to
export the data via NFS.
>From the rsync man page I was under the impression that -a will preserve
owner, group permissions.

What I am wondering is this an issue with rsync, or is it caused by
something behind the scene on the Macintosh? Both the Mac and the Linux
machine are running rsync 2.6.2 (although I don't think it matters what
version the Mac runs).

Hopefully someone, more knowledgeable than me, can enlighten me on what
is going on.

Thanks,

Chris

-- 
_/_/_/_/ Chris Heller                         Network Systems
Administrator |
_/_/_/   Teragram Corporation
|
_/_/_/   10 Fawcett St. 2nd Flr.               web:
http://www.teragram.com |
_/_/     Cambridge, Ma 02138
v

"Chris Heller" writes:
> I ran into a problem today when I tested the system for the first time.
> I am rsyncing from a remote Linux host using the following options to
> rsync: -avv --rsh="<ssh stuff here>"
--exclude-from=<path to exclude
> file> --delete.
> 
> The problem is when the files are moved over to the Mac OS X server
> their owner/group ids change.
> 
> For instance if I copy ~heller/ (uid: 500 gid: 500) to the Mac it
> becomes uid: 504 gid: 504.
> 
> This isn't too big a problem, but it messes up security when I go to
> export the data via NFS.
> 
> >From the rsync man page I was under the impression that -a will
preserve
> owner, group permissions.
By default rsync maps uid/gid values by user/group name at each
end of the transfer.  

Use --numeric-ids to just send the uid/gid without mapping.

Craig