[lucid] how to mount USB storage with correct permissions?

[shawn wilson]

What reinhold said is the proper way to do things (add yourself to the disk
group). If the device ownership isn't correct, check the devfs config. You
could also look at gid and uid options in mount and add that to fstab (as
long as it always shows up as the same device). If you want some interesting
reading, look at playing with hal (overkill).
On Oct 28, 2010 7:58 PM, "D. R. Evans" <doc.evans at gmail.com> wrote:
> Reinhold Rumberger said the following at 10/27/2010 11:42 PM :
>
>>>
>>> But the drives are marked as being owned by root, so I can't write
>>> to them.
>>
>> Actually, that's not true - they should be owned by user root and
>> group disk. Then, any user in the disk group can write to them.
>
> I'm sorry, but it *is* true:
>
> lrwxrwxrwx 1 root root 4 2010-10-27 13:50 usb -> usb0
> drwxr-xr-x 2 root root 4096 2010-10-27 13:50 usb0
> drwxr-xr-x 2 root root 4096 2010-10-27 13:50 usb1
> drwxr-xr-x 2 root root 4096 2010-10-27 13:50 usb2
> drwxr-xr-x 2 root root 4096 2010-10-27 13:50 usb3
> drwxr-xr-x 2 root root 4096 2010-10-27 13:50 usb4
> drwxr-xr-x 2 root root 4096 2010-10-27 13:50 usb5
> drwxr-xr-x 2 root root 4096 2010-10-27 13:50 usb6
> drwxr-xr-x 2 root root 4096 2010-10-27 13:50 usb7
>
>>
>>> I tried changing the permissions on /dev/usb and /dev/usb0,
>>
>> What are those two supposed to be? They don't even exist here.
>>
>
> Well, they exist here, and that's what Kubuntu calls my drives (don't ask
> me why; I have no idea where it gets those names from). When I put a USB
> stick into the socket, the device notifier tells me that there's a new
> device in /media/usb. And, as I show above, that device is owned by root.
> And in particular only root can write to it, which is exactly the
behaviour
> I observe (and can't change).
>
>>> but as
>>> soon as a drive is actually mounted, the permissions change back
>>> so that only root is allowed to write to the drive.
>>
>> Are they, perhaps, links to the actual device files? If so, the
>> permissions of the links are without consequence.
>
> I don't know what the actual device files are. Kubuntu doesn't mention any
> /dev file, just the /media files. Somewhere there must be some kind of
> mapping between the actual devices and the /media files, but I have no
idea
> where that's located; anyway, the desktop seems only to mention the /media
> files so that's what I looked at.
>
>>
>>> What do I have to do so that when I insert a USB drive into a USB
>>> port I can, as an ordinary user, both read and write to the
>>> drive.
>>
>> Usually just make sure the user is in the disk group. (In the user
>> management module in system settings, make sure the user has the
>> "Access external storage devices automatically" privileges checked.)
>
> That is checked.
>
> FWIW, this all worked perfectly in every release all the way back to
> dapper, without my having to do anything at all. It's so frustrating when
> things that have worked for years are suddenly broken :-(
>
> Doc
>
> --
> Web: http://www.sff.net/people/N7DR
>
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