udev rule/permissions question

[Kevin J. Cummings]

On 07/25/2010 11:09 AM, Hiisi wrote:
> Dear users!
> I need udev to make /dev/mymodem symlink when USB-modem is plugged in.
> So, I have created this:
> cat /etc/udev/rules.d/95-huawei-e15150.rules
> SUBSYSTEM=="usb", ATTRS{serial}=="0000:00:03.3", SYMLINK+="mymodem"
> GROUP="dialout"
> 
> Now when modem is plugged in the symlink /dev/mymodem is created but
> permissions are wrong:
> ls -l /dev/mymodem
> lrwxrwxrwx. 1 root root 15 25.7. 19:01 /dev/mymodem -> bus/usb/001/026

What are the permissions on bus/usb/001/026?  From my testing, if you
chown a symlink, it changes the permissions on what it points to, not on
the link itself....

I did the following:

% touch foo
% ls -l foo
-rw-rw-r-- 1 cummings cummings 0 2010-07-25 15:07 foo
% ln -s foo bar
% ls -l bar
lrwxrwxrwx 1 cummings cummings 3 2010-07-25 15:08 bar -> foo
% sudo chown root:wheel bar
% ls -l foo bar
lrwxrwxrwx 1 cummings cummings 3 2010-07-25 15:08 bar -> foo
-rw-rw-r-- 1 root     wheel    0 2010-07-25 15:07 foo

> I would like it to be owned by root:dialout.
> Why 'GROUP' option doesn't work? Could anybody point me to solution of this?
> TIA

-- 
Kevin J. Cummings
kjchome at rcn.com
cummings at kjchome.homeip.net
cummings at kjc386.framingham.ma.us
Registered Linux User #1232 (http://counter.li.org)