Re: matching udev attribute keys

[Tom H <tomh0665@gmail.com>]

On Mon, Dec 27, 2010 at 2:26 PM, Camaleón <noelamac@gmail.com> wrote:
> On Mon, 27 Dec 2010 13:20:37 -0500, Tom H wrote:
>> On Mon, Dec 27, 2010 at 10:17 AM, Camaleón <noelamac@gmail.com> wrote:
>>> On Sun, 26 Dec 2010 15:58:08 -0800, briand wrote:
>>>
>>>> how do I know that "SerialNumber" is a valid udev key other than the
>>>> fact that it is listed in dmesg when the device is plugged in.
>>>
>>> For instance, my USB key has at least one "ATTRS{serial}" value:
>>>
>>> sm01@stt008:~$ udevinfo -a -p /sys/block/sdc | grep serial
>>>    ATTRS{serial}=="0000:00:1a.7"
>>>
>>> But not my internal hard disks, neither from udevinfo:
>>>
>>> sm01@stt008:~$ udevinfo -a -p /sys/block/sda | grep serial
>>> sm01@stt008:~$ udevinfo -a -p /sys/block/sdb | grep serial
>>> sm01@stt008:~$
>>
>> Question:
>>
>> You use the equivalent of "udevadm info --attribute-walk
>> --path=/sys/block/sda".
>>
>> What if you use "udevadm info --query=property --path=/sys/block/sda"
>> and it outputs an "ID_SERIAL"? Can it be used in a udev rule?
>
> I'd say yes, provided it is an ENV (E) key and you write the propper rule:
>
> http://www.reactivated.net/writing_udev_rules.html#env

Thanks.