Re: [gentoo-user] permissions, fstab and LVM

[Dirk Heinrichs]

Am Montag, 8. Oktober 2007 schrieb ext Thufir:
> I seem to have the permissions wrong in fstab.  On boot I do have an icon
> on the desktop for the LVM volume, which can be browsed as root, but not
> as a user.
>
> I want read/write permissions to the LVM volume as user "thufir" (or any
> user, really).  Can this be done?

Yes. Mount it, (recursivly) change the group of the top level directory and 
give group write permissions, then add all users which should have full 
access to that group (they need to logout/login to change their group 
membership information).

You could also add ACL entries to it for more fine grained control (i.e. 
allow full access for user "thufir", but only read access for "janedoe").

See man pages of chmod, chgrp, setfacl, getfacl. For ACLs to work make sure 
the filesystem module in question is compiled with proper ACL support (i.e. 
CONFIG_EXT3_FS_POSIX_ACL=y).

> arrakis ~ # cat /etc/fstab
> /dev/VolGroup00/LogVol00        /mnt/VolGroup00/LogVol00        ext3    
> users,rw        0 0

This just means that normal users can _mount_ the volume. Access is granted 
based on filesystem permissions.

> arrakis ~ #
> arrakis ~ # su thufir
> thufir@arrakis /root $ cd
> thufir@arrakis ~ $
> thufir@arrakis ~ $ ll /mnt/VolGroup00/LogVol00/home/thufir/
> ls: cannot open directory /mnt/VolGroup00/LogVol00/home/thufir/:
> Permission denied

What are the permissions of /mnt/VolGroup00/LogVol00/home/thufir (as root: 
ll -d /mnt/VolGroup00/LogVol00/home/thufir)?

Bye...

	Dirk
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