[Nut-upsuser] USB problem as user

[Czuczy Gergely]

On Sat, 21 Apr 2007 21:56:53 -0300 (ADT)
selinger at mathstat.dal.ca (Peter Selinger) wrote:

> In this case, I recommend that you do some testing and figure out
> yourself what the problem is. 
> 
> The debug output that you sent indicates that newhidups was unable to
> find the USB device, not that it was unable to open it. So perhaps
> this is not a permissions problem after all. Perhaps the device got
> unplugged or unloaded. 
> 
> Do you see the device with "lsusb" or "usbview"? Do you see it with
> "ls -lr /proc/bus/usb"?
> 
> Try alternating "-u root" and "-u nut" several times to make sure one
> always works and the other one doesn't.
Yes, as I had already mentioned, I'm all over this.

> Also check that no other copy of newhidups is already running; you
> can't attach two driver instances to a single device. 
I've checked it, several times.

> Finally, to state the obvious: if your computer is a production system
> that cannot be experimented with, then attach the UPS to another,
> non-production system, and make sure it works there first. 
There it works. and I've only got production systems at that
location.

So, after suggesting again what I had already done and said
I'd done it, have you got _any_ useful comments?

Can you give me _any_ clue where to start on this? _anything_
> 
> Good luck! -- Peter
> 
> Czuczy Gergely wrote:
> > 
> > On Fri, 20 Apr 2007 14:36:06 -0300 (ADT)
> > selinger at mathstat.dal.ca (Peter Selinger) wrote:
> > 
> > > There are two solutions, and you almost mentioned them yourself.
> > >
> > > (1) run the driver and upsd with -u root, or
> > This is the situation that I'd like to prevent.
> > >
> > > (2) change the permissions for the USB device corresponding to
> > > your UPS, which is most likely /proc/bus/usb/XXX/YYY, for certain
> > >     values of XXX and YYY.
> > As I have already told it, I've done this, but it does not work.
> > Chown/modding the /proc/bus/usb to nut:nut (the user:group which
> > the daemon runs with) recursively (that means, every dir and every
> > sub-dir and file of it, and ever subdir of every subdir, so on...)
> > seems not to be enough, since newhidups is unable to find the
> > device, as I have pasted it previously.
> > 
> > >
> > > If you do not have hotplugging or udev, then you cannot automate
> > > step (2).
> > >
> > > -- Peter
> > >
> > > Czuczy Gergely wrote:
> > > >
> > > > Hello
> > > >
> > > > I'm having a bit of a trouble to set up a Back-UPS on
> > > > a production box.
> > > > We're using the newhidups driver for this module here, in
> > > > the office, and I'd like to monitor the one, out in our
> > > > server farm.
> > > >
> > > > The situation is the following:
> > > > # /lib/nut/newhidups -u root -DD -a ups1 2> ups1.out
> > > > Network UPS Tools: 0.28 USB communication driver 0.28 - core
> > > > 0.30 (2.0.5)
> > > >
> > > > this one worked flawlessly, while as a user, it cannot access
> > > > the UPS:
> > > >
> > > > # /lib/nut/newhidups -u nut -DD -a ups1
> > > > Network UPS Tools: 0.28 USB communication driver 0.28 - core
> > > > 0.30 (2.0.5)
> > > >
> > > > debug level is '2'
> > > > No appropriate HID device found
> > > > No matching HID UPS found
> > > >
> > > > I've chowned to nut:nut /dev/usb/* and /proc/bus/usb
> > > > recursively, but it didn't help.
> > > >
> > > > I'd like to ask for help, what do i need to adjust on the system
> > > > to make it work.
> > > >
> > > > Some circumstances:
> > > > This is a production box. The kernel cannot be changed,
> > > > it cannot be restarted, and it should be held in awe and
> > > > respect. So I can only touch it as minimally as it's
> > > > required.
> > > >
> > > > hotplug is not available here, so replugging is USB cable is
> > > > out of question.
> > > >
> > > > # /etc/init.d/hotplug restart
> > > >  * Kernel hotplug support not enabled.
> > > >
> > > > So, what should I do to make this work?
> > > >
> > > > --
> > > > =C3=9Cdv=C3=B6zlettel,
> > > >
> > > > Czuczy Gergely
> > > > Publishing Factory Kft
> > > > http://www.publishing.hu/
> > 
> 


-- 
Üdvözlettel,

Czuczy Gergely
Publishing Factory Kft
http://www.publishing.hu/