[Lunar-bugs] [Lunar Linux 0000167]: udev/sane-backends: USB scanner support (libusb, /dev/sg0, cdrom group etc.)

[Lunar bug reports list]

The following issue has been RESOLVED. 
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http://bugs.lunar-linux.org/view.php?id=167 
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Reported By:                jannis
Assigned To:                Moe
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Project:                    Lunar Linux
Issue ID:                   167
Category:                   module
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     resolved
Moonbase Version:           20060111.14 
Core Tools:                 Theedge 
Core Tools Version:         20061110 
Resolution:                 fixed
Fixed in Version:           
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Date Submitted:             01-28-2007 18:37 CET
Last Modified:              02-07-2007 20:20 CET
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Summary:                    udev/sane-backends: USB scanner support (libusb,
/dev/sg0, cdrom group etc.)
Description: 
I've been trying to configure USB scanners (from Epson and Canon) on two
machines lately. On both I had the same problems:

  * sane-find-scanner detects them, but scanimage does not
  * No /dev/scanner* or /dev/usbscanner* device nodes exist, instead
    the scanners both seem to be using /dev/sg0
  * /var/lock/sane is missing

The last point is related to sane-backends and can be easily fixed in the
BUILD script. The others are more complicated.

First of all, the scanners are using /dev/sg0. There is only one udev rule
existing in 50-udev.rules (line 38), which assigns /dev/sg0 to the "cdrom"
group. /etc/security/console.perms states that /dev/sg0 may only be
accessed by root.cdrom.

We probably need to add a rule which creates /dev/scanner%e (or something
similar) for USB scanners and assigns them to the group "scanner" (or
whatever we might want to call it). 

Another problem I had was that, after these tweaks, scanimage still didn't
allow normal users (or users in group "cdrom"/"scanner") to access the
scanner. This was solved by applying chmod a+rw to /dev/bus/usb/001/006
(in this case). It's likely that something similar to this would have to
be added to the udev scanner rule as well, so that the scanner group has
full access to all scanner devices.
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---------------------------------------------------------------------- 
 Moe - 02-07-07 19:18  
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Is this fixed now? Or is it still an issue that /dev/scanner isn't there? 

---------------------------------------------------------------------- 
 jannis - 02-07-07 20:20  
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Problem solved. The /dev/sg0 stuff mentioned in the bug report is not
relevant for the scanner detection. /var/lock/sane is now created by
sane-backends and all USB devices are assigend to group usb - those two
things were everything needed for making scanners work. 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
01-28-07 18:37  jannis         New Issue                                    
01-28-07 18:37  jannis         Moonbase Version          => 20060111.14     
01-28-07 18:37  jannis         Core Tools                => Theedge         
01-28-07 18:37  jannis         Core Tools Version        => 20061110        
02-07-07 19:18  Moe            Note Added: 0000350                          
02-07-07 19:18  Moe            Assigned To               => Moe             
02-07-07 19:18  Moe            Status                   new => feedback     
02-07-07 20:20  jannis         Status                   feedback => resolved
02-07-07 20:20  jannis         Resolution               open => fixed       
02-07-07 20:20  jannis         Note Added: 0000351                          
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