[wellylug] Scanner permissions

[Rob van der Linde]

Thanks, that works. Now to make a driver for openpsfc :)

On Mon, 2008-09-15 at 19:48 +1200, Jethro Carr wrote:
> On Mon, 2008-09-15 at 19:40 +1200, Rob van der Linde wrote:
> > I have a Canon USB scanner which is supported by Linux (I can run it no
> > problem on Ubuntu 8.04 desktop), that I want to get running on Ubuntu
> > 8.04 server. When I enter:
> > 
> > scanimage -L
> > 
> > Nothing shows, however:
> > 
> > sudo scanimage -L
> > 
> > Comes up with the following:
> > 
> > device `plustek:libusb:002:003' is a Canon CanoScan N1240U/LiDE30
> > flatbed scanner
> > 
> > I also ran sane-find-scanner which sees the scanner, it says you may
> > need to adjust the permissions for scanimage -L to see it. I think that
> > is is why it is only showing when I run that command as root.
> > 
> > I want to be able to use the scanner as the user www-data, so I can run
> > Jethro's openpsfc software. Any ideas how I should do this?
> 
> hi Rob,
> 
> I believe it works with your GUI because HAL/GNOME/KDE does some funky
> stuff to give the user access to the scanner device.
> 
> To make it work on a server, I tend to fix it by giving the scanimage
> command permissions to run as root when executed by any user. Eg:
> chmod +s /usr/bin/scanimage
> 
> There are other ways too, such as setting up sudo access, but the chmod
> method is easiest.
> 
> There may be a better way to give non-root users access to scanners, but
> I'm not aware of how. (if you know, please do enlighten me! :-)
> 
> The problem is that usb scanners don't create device files, so you can't
> set permissions on them that way, it's all done using kernel APIs.
> 
> regards,
> jethro
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