Re: Permissions of usb hub and its children

[Fabian Steiner <fabian.steiner@gmail.com>]

Greg KH wrote:
> On Tue, Sep 05, 2006 at 11:52:54AM +0200, Fabian Steiner wrote:
>> Hello!
>>
>> I am trying to change the permissions of my usb hub with the follwing
>> udev rule:
>>
>> SUBSYSTEM="usb", DEVPATH="/devices/pci0000:00/0000:00:02.1/usb1/1-3",
>> OWNER="fabi", MODE="600
> 
> What are you trying to change here?  The permissions of the usb hub in
> usbfs?

Yes, my intension was to assign proper permissions to the usb hub so
that all devices that are connected to that hub get the same permissions.

>> Doing so I hoped that all usb devices that will be connected to that hub
>> would receive the same permissions but obviously it doesn't work.
> 
> No, hub permissions do not propagate down to the devices, sorry.
> 
>> Is there any possibility to achieve this goal using udev?
> 
> Yes, use much the same rule as above :)

What does the rule have to look like then? ;-) The main problem is that
I don't know what kind of devices are plugged in the hub. So the udev
rule has to match quite a lot of devices (block devices, scanner, mouse,
etc.).

Having a more closer look at different manpages and howtos I have found
a solution that is almost suitable:

SUBSYSTEM="*",
ENV{PHYSDEVPATH}="/devices/pci0000:00/0000:00:02.1/usb1/1-3*",
OWNER:="fabi", MODE:="600"

I am not quite sure whether this rule will fulfill all of my
requirements but so far it looks good. I.e. I don't know for sure
whether ENV{PHYSDEVPATH} is set for all devices and whether it contains
a sysfs address. Perhaps you could give me a hint :-)

Thanks,
Fabian STeiner



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