[sllug-members]: udev question

[Robert Lewis]

Allen Parker wrote:
> On 12/21/06, Robert Lewis <rll at felton.felton.ca.us> wrote:
>> I apologize in advance for not rereading the udev man pages
>> another few times. I have now read it 3 or 4 times but still
>> unclear how to do something I wish to do.
>>
>> I have an internal modem that uses /dev/ttyS1
>>
>> It comes up with preset permissions and ownership.
>>
>> I want the /dev/ttyS1 to end up with permissions of
>> 666 and perhaps owned by uucp and group uucp although
>> that is less important.  The defaults are root:uucp
>> with permissions of 640.  I also want modem1 to be
>> a symbolic link to ttyS1.
>>
>> I went into /lib/udev/devices and created the following:
>> 1) made sure that ttyS1 looked like:
>>    crw-rw-rw- 1 uucp uucp   4,  65 Nov 25 04:17 ttyS1
>>
>> 2) created the modem1 symbolic link:
>>    lrwxrwxrwx 1 root root 5 Dec 20 10:50 modem1 -> ttyS1
>>
>> After a reboot /dev does get the symbol link.  However, tyS1
>> looks like:
>> crw-rw---- 1 root uucp 4, 65 Dec 21 08:39 ttyS1
>>
>> What is the best way to open up permissions on this one device
>> that will stick through a reboot?
>>
>> Cheers,
>> Bob
>
> See /etc/udev/permissions.rules
> add this line in with the other KERNEL rules:
> KERNEL=="ttyS[0-9]*", GROUP="uucp", MODE="0666"
>
> reboot and everything should be good to go.
> ______________________________________________________________________
>
Thank you very much Allen.  It all works now.

Only changes I made to your suggestion:
On SUSE 10.2 I found no permissions.rules so I instead edited
the following path:  /etc/udev/rules.d/50-udev-default.rules

I also added in to the end of your line: OPTIONS="last_rule"
because although the permissions came up correct the GROUP
ownership didn't because some other rule downstream over wrote
the request I supect.  The directory is layed out somewhat like
/etc/init.d/rc5.d  in that each file is preceded with a number and
read in order at boot time it looks like.

Thanks again.

Cheers,
Bob