forked from mirrors/nixpkgs
226 lines
6.2 KiB
Nix
226 lines
6.2 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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inherit (pkgs) cups;
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logDir = "/var/log/cups";
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cfg = config.services.printing;
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additionalBackends = pkgs.runCommand "additional-cups-backends" { }
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''
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mkdir -p $out
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if [ ! -e ${pkgs.cups}/lib/cups/backend/smb ]; then
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mkdir -p $out/lib/cups/backend
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ln -sv ${pkgs.samba}/bin/smbspool $out/lib/cups/backend/smb
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fi
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# Provide support for printing via HTTPS.
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if [ ! -e ${pkgs.cups}/lib/cups/backend/https ]; then
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mkdir -p $out/lib/cups/backend
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ln -sv ${pkgs.cups}/lib/cups/backend/ipp $out/lib/cups/backend/https
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fi
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# Import filter configuration from Ghostscript.
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mkdir -p $out/share/cups/mime/
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ln -v -s "${pkgs.ghostscript}/etc/cups/"* $out/share/cups/mime/
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'';
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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.buildEnv {
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name = "cups-progs";
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paths = cfg.drivers;
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pathsToLink = [ "/lib/cups" "/share/cups" "/bin" ];
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postBuild = cfg.bindirCmds;
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};
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in
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{
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###### interface
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options = {
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services.printing = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to enable printing support through the CUPS daemon.
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'';
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};
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bindirCmds = mkOption {
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default = "";
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description = ''
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Additional commands executed while creating the directory
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containing the CUPS server binaries.
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'';
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};
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cupsdConf = mkOption {
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default = "";
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example =
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''
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BrowsePoll cups.example.com
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LogLevel debug
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'';
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description = ''
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The contents of the configuration file of the CUPS daemon
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(<filename>cupsd.conf</filename>).
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'';
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};
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drivers = mkOption {
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example = [ pkgs.splix ];
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description = ''
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CUPS drivers (CUPS, gs and samba are added unconditionally).
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'';
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};
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tempDir = mkOption {
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default = "/tmp";
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example = "/tmp/cups";
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description = ''
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CUPSd temporary directory.
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'';
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};
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};
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};
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###### implementation
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config = mkIf config.services.printing.enable {
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users.extraUsers = singleton
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{ name = "cups";
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uid = config.ids.uids.cups;
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group = "lp";
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description = "CUPS printing services";
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};
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environment.systemPackages = [ cups ];
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services.dbus.packages = [ cups ];
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# Cups uses libusb to talk to printers, and does not use the
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# linux kernel driver. If the driver is not in a black list, it
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# gets loaded, and then cups cannot access the printers.
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boot.blacklistedKernelModules = [ "usblp" ];
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jobs.cupsd =
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{ description = "CUPS Printing Daemon";
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startOn = "started network-interfaces";
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stopOn = "stopping network-interfaces";
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path = [ cups ];
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preStart =
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''
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mkdir -m 0755 -p /etc/cups
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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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mkdir -m 0755 -p ${cfg.tempDir}
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'';
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exec = "cupsd -c ${pkgs.writeText "cupsd.conf" cfg.cupsdConf} -F";
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};
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services.printing.drivers =
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[ pkgs.cups pkgs.cups_pdf_filter pkgs.ghostscript additionalBackends pkgs.perl pkgs.coreutils pkgs.gnused ];
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services.printing.cupsdConf =
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''
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LogLevel info
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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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DataDir ${bindir}/share/cups
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SetEnv PATH ${bindir}/lib/cups/filter:${bindir}/bin:${bindir}/sbin
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AccessLog ${logDir}/access_log
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ErrorLog ${logDir}/error_log
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PageLog ${logDir}/page_log
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TempDir ${cfg.tempDir}
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# User and group used to run external programs, including
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# those that actually send the job to the printer. Note that
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# Udev sets the group of printer devices to `lp', so we want
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# these programs to run as `lp' as well.
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User cups
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Group lp
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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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# Allow CUPS to receive IPP printer announcements via UDP.
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networking.firewall.allowedUDPPorts = [ 631 ];
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};
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}
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