Re: can non-owner change file group setup?

[Filipe Brandenburger <filbranden@xxxxxxxxx>]

Hi,

On Wed, May 13, 2009 at 11:01, John R Pierce <pierce@xxxxxxxxxxxx> wrote:
> nope.
>
> [pierce@xxxx test]$ grep pierce /etc/group
> postgres:x:26:pierce
> pierce:x:503:
> [pierce@xxxx test]$ touch x
> [pierce@xxxx  test]$ ls -la
> total 8
> drwxrwxr-x  2 pierce pierce 4096 May 13 07:58 .
> drwxr-xr-x 37 pierce root   4096 May 13 07:57 ..
> -rw-rw-r--  1 pierce pierce    0 May 13 07:58 x
> [pierce@xxxx test]$ chgrp postgres x
> chgrp: changing group of `x': Operation not permitted

It would work if user "pierce" belonged to group "postgres".

But it only works if you are the owner of the file. If you belong to
the group the file belongs to, it does not work.

I would say the best way to handle group ownership in Linux (and Unix)
is to make sure files are originally created with the correct groups
(possibly by using setgid directories).

HTH,
Filipe
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