a3f778c23d
because CUPS modifies files in the ServerRoot directory. Most
importantly, it stores printer configuration there. Previously the
CUPS server modified the files under ${cups}/etc/cups, which is
impure and caused all configured printers to disappear any time CUPS
was upgraded.
svn path=/nixos/trunk/; revision=13892
137 lines
3.7 KiB
Nix
137 lines
3.7 KiB
Nix
{config, pkgs, modprobe}:
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let
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logDir = "/var/log/cups";
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inherit (pkgs) cups;
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# Here we can enable additional backends, filters, etc. that are not
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# part of CUPS itself, e.g. the SMB backend is part of Samba. Since
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# we can't update ${cups}/lib/cups itself, we create a symlink tree
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# here and add the additional programs. The ServerBin directive in
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# cupsd.conf tells cupsd to use this tree.
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bindir = pkgs.runCommand "cups-progs" {} ''
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ensureDir $out/lib/cups
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ln -s ${cups}/lib/cups/* $out/lib/cups/
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# Provide support for printing via SMB.
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rm $out/lib/cups/backend
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ensureDir $out/lib/cups/backend
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ln -s ${cups}/lib/cups/backend/* $out/lib/cups/backend/
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ln -s ${pkgs.samba}/bin/smbspool $out/lib/cups/backend/smb
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# Provide Ghostscript rasterisation, necessary for non-Postscript
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# printers.
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rm $out/lib/cups/filter
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ensureDir $out/lib/cups/filter
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ln -s ${cups}/lib/cups/filter/* $out/lib/cups/filter/
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ln -s ${pkgs.ghostscript}/lib/cups/filter/* $out/lib/cups/filter/
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''; # */
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cupsdConfig = pkgs.writeText "cupsd.conf" ''
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LogLevel debug
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SystemGroup root
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Listen localhost:631
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Listen /var/run/cups/cups.sock
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# Note: we can't use ${cups}/etc/cups as the ServerRoot, since
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# CUPS will write in the ServerRoot when e.g. adding new printers
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# through the web interface.
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ServerRoot /etc/cups
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ServerBin ${bindir}/lib/cups
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AccessLog ${logDir}/access_log
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ErrorLog ${logDir}/access_log
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PageLog ${logDir}/page_log
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TempDir /tmp
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Browsing On
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BrowseOrder allow,deny
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BrowseAllow @LOCAL
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DefaultAuthType Basic
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<Location />
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Order allow,deny
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Allow localhost
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</Location>
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<Location /admin>
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Order allow,deny
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Allow localhost
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</Location>
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<Location /admin/conf>
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AuthType Basic
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Require user @SYSTEM
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Order allow,deny
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Allow localhost
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</Location>
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<Policy default>
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<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>
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Require user @OWNER @SYSTEM
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Order deny,allow
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</Limit>
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<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>
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AuthType Basic
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Require user @SYSTEM
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Order deny,allow
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</Limit>
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<Limit Cancel-Job CUPS-Authenticate-Job>
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Require user @OWNER @SYSTEM
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Order deny,allow
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</Limit>
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<Limit All>
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Order deny,allow
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</Limit>
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</Policy>
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'';
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in
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{
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name = "cupsd";
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extraPath = [cups];
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extraEtc = [
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# CUPS expects the following files in its ServerRoot.
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{ source = "${cups}/etc/cups/mime.convs";
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target = "cups/mime.convs";
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}
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{ source = "${cups}/etc/cups/mime.types";
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target = "cups/mime.types";
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}
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];
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job = ''
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description "CUPS printing daemon"
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start on network-interfaces/started
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stop on network-interfaces/stop
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start script
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mkdir -m 0755 -p ${logDir}
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mkdir -m 0700 -p /var/cache/cups
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mkdir -m 0700 -p /var/spool/cups
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# Make USB printers show up.
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${modprobe}/sbin/modprobe usblp || true
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end script
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respawn ${cups}/sbin/cupsd -c ${cupsdConfig} -F
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'';
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}
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