USB group permissions

[Auke Kok]

Jannis wrote:
> Hey devs,
> 
> I've come across several issues when trying to get my USB scanners
> ready lately. One of them was that users in group 'usb' have no
> read+write access to device nodes /dev/bus/usb/**/*. 
> 
> Sane uses libusb to communicate with the scanners I have and libusb
> tries to open one of the device nodes mentioned above for reading and
> writing. IMHO, adding a user to the 'usb' group should give him/her
> permissions to use USB devices like scanners through libusb, which in
> turn means that there should be something like an udev rule for:
> 
>   1. changing the group of all /dev/bus/usb/**/* nodes to 'usb'
>   2. changing the permissions of these nodes at least to g+rw 
> 
> What do you think of this?

sounds reasonable and along the lines of audio, video etc. groups that we 
already have.

Auke