[Pkg-cups-devel] Bug#644205: "Backend /usr/lib/cups/backend/parallel does not exist!" - but it does...
ael
law_ence.dev at ntlworld.com
Mon Oct 3 22:05:08 UTC 2011
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
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