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Bug#644205: marked as done ("Backend /usr/lib/cups/backend/parallel does not exist!" - but it does...)

Your message dated Wed, 28 Aug 2013 21:18:32 +0100
with message-id <28082013210845.54069d414ef1@desktop.copernicus.demon.co.uk>
and subject line Re: Bug#644205: "Backend /usr/lib/cups/backend/parallel does not exist!" - but it does...
has caused the Debian Bug report #644205,
regarding "Backend /usr/lib/cups/backend/parallel does not exist!" - but it does...
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
644205: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=644205
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: cups
Version: 1.5.0-8
Severity: normal

Dear Maintainer,
*** Please consider answering these questions, where appropiate ***

   * What led up to the situation?
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
   * What was the outcome of this action?
   * What outcome did you expect instead?
----------------------------------------------------------------------

I have a parallel laser printer which has worked very well for several
years under cups.

But now, printing is impossible because the printer is paused
with the message 
 Backend /usr/lib/cups/backend/parallel does not exist!

However, it does exist:

$ ls -l /usr/lib/cups/backend/parallel 
-r-xr-xr-x 2 root root 30116 Sep 27 14:14 /usr/lib/cups/backend/parallel

The error message is written to /etc/printers.conf:
# Printer configuration file for CUPS v1.5.0
# Written by cupsd
# DO NOT EDIT THIS FILE WHEN CUPSD IS RUNNING
<Printer HL1250>
UUID urn:uuid:04b22af5-e55f-39b4-61c8-01cd8f0201f1
Info Brother HL1250
Location CR
MakeModel Brother HL-1250 Foomatic/hl1250 (recommended)
DeviceURI parallel:/dev/lp0
State Stopped
StateMessage Backend /usr/lib/cups/backend/parallel does not exist!   <====
StateTime 1248035586
Reason paused
Type 8433668
Accepting Yes
Shared Yes
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
OpPolicy default
ErrorPolicy stop-printer
</Printer>
......
-----------------------------------------------------------

I can write data to the printer with cat "testing \n" > /dev/lp0, so 
that part of the system is fine.

I can run "parallel" as root as follows:

# /usr/lib/cups/backend/parallel 
direct parallel:/dev/lp0 "unknown" "LPT #1" "" ""

/etc/cupsd.conf:-
--------------------------------------------
LogLevel info

# Deactivate CUPS' internal logrotating, as we provide a better one, especially
# LogLevel debug2 gets usable now
MaxLogSize 0

SystemGroup lpadmin
# Allow remote access
Port 631
Listen /var/run/cups/cups.sock
# Enable printer sharing and shared printers.
Browsing On
BrowseOrder allow,deny
BrowseAllow all

BrowseAddress @LOCAL
DefaultAuthType Basic
<Location />
  Allow all
  # Allow shared printing...
  Order allow,deny
  Allow @LOCAL
</Location>
<Location /admin>
  Encryption Required
  Allow localhost
  # Restrict access to the admin pages...
  Order allow,deny
</Location>

# Restrict access to configuration files...

<Location /admin/conf>
  AuthType Basic
  Require user @SYSTEM
  Allow localhost
  # Restrict access to the configuration files...
  Order allow,deny
</Location>

# Set the default printer/job policies...
<Policy default>
  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job CUPS-Move-Job CUPS-Get-Document>
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

 # All administration operations require an administrator to authenticate..
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default CUPS-Get-Devices>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  # All printer operations require a printer operator to authenticate...

  <Limit Pause-Printer Resume-Printer Set-Printer-Attributes Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After CUPS-Add-Printer CUPS-Delete-Printer CUPS-Add-Class CUPS-Delete-Class CUPS-Accept-Jobs CUPS-Reject-Jobs CUPS-Set-Default>
    AuthType Basic
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  <Limit CUPS-Authenticate-Job>
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

 # Only the owner or an administrator can cancel or authenticate a job...
<Limit Cancel-Job CUPS-Authenticate-Job>
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

   <Limit All>
    Order deny,allow
  </Limit>
</Policy>

# Set the authenticated printer/job policies...
<Policy authenticated>
  # Job-related operations must be done by the owner or an administrator...
  <Limit Create-Job Print-Job Print-URI>
    AuthType Default
    Order deny,allow
  </Limit>

  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job CUPS-Move-Job CUPS-Get-Document>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  # All administration operations require an administrator to authenticate...
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  # All printer operations require a printer operator to authenticate...
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After CUPS-Accept-Jobs CUPS-Reject-Jobs>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  # Only the owner or an administrator can cancel or authenticate a job...
  <Limit Cancel-Job CUPS-Authenticate-Job>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  <Limit All>
    Order deny,allow
  </Limit>
</Policy>

Printcap /var/run/cups/printcap

-----------------------------------------------------

So I am not sure where to go from here, unless it is a simple
permission error.

I have been away for a period, so I am not quite sure which cups
upgrade introduced this bug, but it is fairly recent. Perhaps
1.4.8-2 -> 1.5.0-8 or more likely 1.4.7-1 -> 1.4.8-2 .


-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (990, 'testing')
Architecture: i386 (i686)

Kernel: Linux 3.0.0-rc4+ (PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_GB.UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages cups depends on:
ii  adduser                3.113           
ii  bc                     1.06.95-2       
ii  cups-client            1.5.0-8         
ii  cups-common            1.5.0-8         
ii  cups-ppdc              1.5.0-8         
ii  debconf [debconf-2.0]  1.5.40          
ii  ghostscript            9.02~dfsg-3     
ii  libavahi-client3       0.6.30-5        
ii  libavahi-common3       0.6.30-5        
ii  libc6                  2.13-21         
ii  libcups2               1.5.0-8         
ii  libcupscgi1            1.5.0-8         
ii  libcupsdriver1         1.5.0-8         
ii  libcupsimage2          1.5.0-8         
ii  libcupsmime1           1.5.0-8         
ii  libcupsppdc1           1.5.0-8         
ii  libdbus-1-3            1.4.16-1        
ii  libgcc1                1:4.6.1-4       
ii  libgnutls26            2.12.10-2       
ii  libgssapi-krb5-2       1.9.1+dfsg-1    
ii  libijs-0.35            0.35-8          
ii  libkrb5-3              1.9.1+dfsg-1    
ii  liblcms1               1.19.dfsg-1     
ii  libldap-2.4-2          2.4.25-3        
ii  libpam0g               1.1.3-2         
ii  libpaper1              1.1.24+nmu1     
ii  libpoppler13           0.16.7-2+b1     
ii  libslp1                1.2.1-7.8       
ii  libstdc++6             4.6.1-4         
ii  libusb-0.1-4           2:0.1.12-19     
ii  lsb-base               3.2-28          
ii  poppler-utils          0.16.7-2+b1     
ii  procps                 1:3.2.8-11      
ii  ssl-cert               1.0.28          
ii  ttf-freefont           20100919-1      
ii  zlib1g                 1:1.2.3.4.dfsg-3

Versions of packages cups recommends:
ii  avahi-daemon            0.6.30-5   
ii  colord                  0.1.11-1   
ii  cups-driver-gutenprint  5.2.7-2    
ii  foomatic-filters        4.0.9-1    
ii  ghostscript-cups        9.02~dfsg-3

Versions of packages cups suggests:
ii  cups-bsd     1.5.0-8        
ii  cups-pdf     <none>         
ii  foomatic-db  20110803-3     
ii  hplip        <none>         
ii  smbclient    2:3.5.11~dfsg-1
ii  udev         172-1          

-- Configuration Files:
/etc/cups/cupsd.conf [Errno 13] Permission denied: u'/etc/cups/cupsd.conf'

-- debconf information:
* cupsys/backend: ipp, parallel, socket
* cupsys/raw-print: false

--- End Message ---
--- Begin Message --- 
fixed 644205 cups/1.5.3-1
thanks


On Wed 28 Aug 2013 at 19:09:14 +0100, ael wrote:

> So AFAIK, the general bug has gone away, but a new specific bug,
> presumbly a problem with the ppp config has appeared for my particular
> HL1200 Brother laser. Must find time to check and look into it further.
> 
> Sorry not to provide a better answer...

Your response is very helpful. Thank you for the quick reply. I think
closing the report with the bug fixed in cups 1.5.3-1 (which was a new
upstream release) is probably best.

Cheers,

Brian.

--- End Message ---
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