FC12 udev rules

T. Horsnell tsh at mrc-lmb.cam.ac.uk
Wed Mar 3 10:54:29 UTC 2010

Paul W. Frields wrote:
> On Thu, Feb 25, 2010 at 09:42:15AM +0000, T. Horsnell wrote:
>> Hi all,
>> I need to set up a custom rule to give me mode 666 on a custom USB device
>> (or on all the otherwise un-handled USB devices).
>> I used to do this (in FC9) by modifying ruleset 50-udev-default.rules at
>> the libusb entry (I know this was not the 'correct' way, but I could never
>> understand udev enough to work out what *was* the correct way).
>> Now that I've moved to FC12, this 50- rulest doesnt exist, and I cant find
>> where the libusb stuff is now handled. Can someone please tell me how to
>> correctly add a custom rule. Presumably I have to use a filename which causes
>> it to be executed in the right order. Does udev stop processing subsequent
>> rules files when it hits a rule which matches?
>> In ruleset 50-udev-default.rules I used to have:
>> ###SUBSYSTEM=="usb", ACTION=="add", ENV{DEVTYPE}=="usb_device", NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", MODE="0644"
>> SUBSYSTEM=="usb", ACTION=="add", ENV{DEVTYPE}=="usb_device", NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", MODE="0666"
> That rule has moved into /lib/udev/rules.d/.  And AFAIK udev reads all
> rules in and evaluates all the matches in order.  Honestly I'm not an
> expert, so don't take this as gospel, but I'm pretty sure you have to
> explicitly do something to make udev bail completely partway through
> those evaluations.

Many thanks for that info. The file I need is right there in /lib/udev/rules.d.
But what is the stuff still in /etc/udev/rules.d/ used for I wonder...


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