Fwd: [Discuss-gnuradio] Big bugs out of nowhere...

[Igor Almeida]

Oops, sorry for this. I thought I sent the e-mail to the list but just
noticed only Johnathan got it.
I am posting it again hoping that someone can help.

---------- Forwarded message ----------
From: Igor Almeida <address@hidden>
Date: Fri, Dec 19, 2008 at 10:04 AM
Subject: Re: [Discuss-gnuradio] Big bugs out of nowhere...
To: Johnathan Corgan <address@hidden>


Hi Johnathan,

Thank you for the insight. I was indeed NOT a user of the usrp group
to which udev was configuring the block device.
The thing is, we have an LDAP-configured network here, and we use it
to fetch a number of configs, including groups, passwords and whatnot.

Bottom line, there were two 'usrp' groups: one from /etc/group, with
no members; and the other was from LDAP, with myself as member.

So I removed the usrp group from /etc/group{,-}, and it no longer
exists acording to 'getent group|grep usrp', but now udev seems to be
confused as it changes the permissions correctly, but the group
association is not performed:
/dev/bus/usb/007:
total 0
crw-rw-r-- 1 root root 189, 768 2008-12-19 06:38 001
crw-rw---- 1 root root 189, 769 2008-12-19 09:50 002

Notice the crw-rw---- block, which showed up when I plugged the usb cable.

So if udev cannot be aware of the usrp group fetched from LDAP, the
whole LDAP-centralizing-access-permissions scheme goes down, because I
will have to manually create and maintain/synchronize the usrp group
in every machine on the lab.

On Wed, Dec 17, 2008 at 5:34 PM, Johnathan Corgan
<address@hidden> wrote:
> On Wed, Dec 17, 2008 at 6:56 AM, Igor Almeida <address@hidden> wrote:
>
>>  File "/usr/local/gnuradio/lib/python2.5/site-packages/gnuradio/usrp.py",
>> line 79, in _look_for_usrp
>>    raise RuntimeError, "Unable to find USRP #%d" % (which,)
>> RuntimeError: Unable to find USRP #0
>
> Can you use the 'groups' command to verify the user running the script
> really is a member of group 'usrp'?  Also, you may need to log the
> user out and back in for the group membership to become effective.
>
> -Johnathan
>



--
Igor Almeida



-- 
Igor Almeida