On Tuesday 16 October 2007, Mick wrote:
> Hi All,
>
> This is a simple question but I'm getting tired and can't think
> straight with this permissions problem:
>
> I am trying to create a directory within which two users will be able
> to save and delete documents. This directory is only meant to be
> accessible/readable by these two users.
>
> I created directory TEST, under /var/www/html. This contains
> subdirectories TEST1, TEST2, TEST3. Each subdirectory contains other
> files. I set the permissions recursively to apache:ftp. Both users
> are members of group ftp. I chmod -R g+w.
>
> When I create a new subdirectory and save a file in it I noticed that
> it is mick:wheel instead of mick:ftp. How do I set it up so that
> newly created directories/files inherit the parent group ownership?
You want the setgid bit on for the directory. This causes all new files
and directories in it to be owned by the same group that owns the
top-most directory:
chmod g+s TEST
This won't change permissions on existing directories though, and you
can't use chmod -R (that will sgid the files as well), so use find like
so:
find TEST -type d -exec chmod g+s {} \;
You will also need to enable group write permission on these directories
so that your users can delete stuff. Two ways:
1. Make sure both users use a umask like 775 (this is fragile as the
user can change their umask any time they want)
2. Use an ACL on the directory. 'man setfacl' for more details
alan
--
Optimists say the glass is half full,
Pessimists say the glass is half empty,
Developers say wtf is the glass twice as big as it needs to be?
Alan McKinnon
alan at linuxholdings dot co dot za
+27 82, double three seven, one nine three five
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