Arch Linux

Description:

When enabling the "Share published printers connected to this system" option in the CUPS WebUI, it garbles the cupsd.conf file and renders it unreadable by CUPS. CUPS will fail to load until the configuration file is fixed manually.

Here is what the setting change does to the file:

LogLevel info
SystemGroup sys root
# 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 �c # <------ Here is the DEEEEATH and DEEESTRUUUCCTIOOONNN, technically speaking
<Location />
Allow localhost
Allow From 192.168.1.103
# Allow shared printing...
Order allow,deny
Allow @LOCAL
</Location>
<Location /admin>
Encryption Required
Allow localhost
# Restrict access to the admin pages...
Order allow,deny
Allow localhost
</Location>
<Location /admin/conf>
AuthType Default
Require user @SYSTEM
Allow localhost
# Restrict access to the configuration files...
Order allow,deny
Allow localhost
</Location>
<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>
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<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>
<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>
<Limit Cancel-Job CUPS-Authenticate-Job>
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit All>
Order deny,allow
</Limit>
</Policy>

Additional info:
* CUPS version 1.3.5-1
* Administered with Firefox 2.0.0.11-1

Steps to reproduce:

Starting with the default cupsd.conf, go to the WebUI for CUPS (127.0.0.1:631) and click Administration. Click "Share public printers connected to this system" and click "Change Settings". CUPS will restart in the background and fail with an error: "Feb 3 14:20:40 jennaluv cupsd: Unable to read configuration file '/etc/cups/cupsd.conf' - exiting!" and the WebUI will fail to load.