scanimage -L doesn't work as normal user

[Erik Nørgaard]

On Sat, 30 Jul 2005, Marc Fonvieille wrote:

> On Sat, Jul 30, 2005 at 12:14:25PM +0200, Erik Nørgaard wrote:
> > On Sat, 30 Jul 2005, cpghost wrote:
> >
> > > > Then as ordinary user:
> > > > $ sane-find-scanner -q
> > > > found USB scanner (vendor=0x04b8 [EPSON], product=0x0121 [EPSON
> > > > Scanner]) at libusb:/dev/usb0:/dev/ugen0
> > > > $ scanimage -L
> > > >
> > > > No scanners were identified.
> > >
> > > This is normally a problem with permissions. You could set them
> > > to 0666 in /etc/devfs.conf, and [re]start devfs with
> > > # /etc/rc.d/devfs start
> >
> > This was also what I thought, but I can't seem to get it right:
> >
> > In my devfs.conf I have:
> > # Allow all users to use the scanner
> > perm    ugen0  0666
> >
> > perm    usb    0666
> > perm    usb0   0666
> > perm    usb1   0666
> >
> > But when I plugin the scanner, ugen0 and ugen0.* has permissions
> > crw-r--r--
> >
> [...]
>
> You have to use uscanner not ugenX
> You should read the Handbook section related to the image scanners:
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/scanners.html

Thanks, I did read it. But if that is the problem, then please
explain why I can scan as root but not as ordinary user?

When I create a link uscanner0 -> ugen0 that link gets permissions
lrwxr-xr-x and I can't change those. I then run as normal user

$ sane-find-scanner -q
found USB scanner (UNKNOWN vendor and product) at device /dev/uscanner0
found USB scanner (vendor=0x04b8 [EPSON], product=0x0121 [EPSON Scanner]) at
   libusb:/dev/usb0:/dev/ugen0

So you see, it's not that I can't find the scanner. It is beyond
me to understand why sane-find-scanner works as documented but
scanimage don't.

According to documentation this scanner uses the snapscan backend,
in snapscan.conf I have:

firmware /usr/local/etc/sane.d/Esfw41.bin
# If not automatically found you may manually specify a device name.
# For USB scanners also specify bus=usb, e.g.
# /dev/usb/scanner0 bus=usb

#/dev/uscanner0 bus=usb
usb /dev/uscanner0

I have tried specifying the usb-scanner, both as written in the
handbook and as suggested in the file and without any entries. No
change.

I don't think this file is read, because that would probably
require that scanimage first identify the backend.

Thanks, Erik

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