On Tue, Oct 30, 2012 at 6:31 PM, Xiaofan Chen <xiaof...@gmail.com> wrote:
> On Wed, Oct 31, 2012 at 9:29 AM, Xiaofan Chen <xiaof...@gmail.com> wrote:
>> On Wed, Oct 31, 2012 at 2:25 AM, David Grant <davidgr...@gmail.com> wrote:
>>> Could someone with write access to the libusbx wiki add this to the
>>> "Can I run Linux libusbx applications without root privilege?"
>>> section?
>>>
>>> Example udev rules file, call it "10-libusb.rules"
>>> SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", GROUP="libusbusers", 
>>> MODE="0664"
>>>
>>
>> I am reluctant to add anything like the above even though
>> it is quite popular (usually people use plugdev group or
>> things like that).
>>
>> Just take a look at the default udev rules
>> whch is /lib/udev/rules.d/50-udev-default.rules, there is
>> already provision for libusb device.
>>
>> # 'libusb' device nodes
>> SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", MODE="0664"
>> SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", IMPORT{builtin}="usb_id"
>>
>> It seems to me that udev developers thought about the group based
>> method and decided against it.
>>
>
> Of course the problem is that the default rule does not work
> well due to the use of MODE="0664". Maybe it is a good idea
> to ask in linux-hotplug mailing list to see the recommendation
> from udev developers.

I'm not sure if my way of doing it is the recommended method but I
copied what I used to have to do when I used VirtualBox with USB
devices.

Dave

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