nixpkgs-suyu/nixos/modules/services/printing/cupsd.nix

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{ config, lib, pkgs, ... }:
with lib;
let
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inherit (pkgs) cups cups_filters;
cfg = config.services.printing;
additionalBackends = pkgs.runCommand "additional-cups-backends" { }
''
mkdir -p $out
if [ ! -e ${cups}/lib/cups/backend/smb ]; then
mkdir -p $out/lib/cups/backend
ln -sv ${pkgs.samba}/bin/smbspool $out/lib/cups/backend/smb
fi
# Provide support for printing via HTTPS.
if [ ! -e ${cups}/lib/cups/backend/https ]; then
mkdir -p $out/lib/cups/backend
ln -sv ${cups}/lib/cups/backend/ipp $out/lib/cups/backend/https
fi
'';
# Here we can enable additional backends, filters, etc. that are not
# part of CUPS itself, e.g. the SMB backend is part of Samba. Since
# we can't update ${cups}/lib/cups itself, we create a symlink tree
# here and add the additional programs. The ServerBin directive in
# cupsd.conf tells cupsd to use this tree.
bindir = pkgs.buildEnv {
name = "cups-progs";
paths = cfg.drivers;
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pathsToLink = [ "/lib/cups" "/share/cups" "/bin" "/etc/cups" ];
postBuild = cfg.bindirCmds;
ignoreCollisions = true;
};
in
{
###### interface
options = {
services.printing = {
enable = mkOption {
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type = types.bool;
default = false;
description = ''
Whether to enable printing support through the CUPS daemon.
'';
};
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listenAddresses = mkOption {
type = types.listOf types.str;
default = [ "127.0.0.1:631" ];
example = [ "*:631" ];
description = ''
A list of addresses and ports on which to listen.
'';
};
bindirCmds = mkOption {
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type = types.lines;
internal = true;
default = "";
description = ''
Additional commands executed while creating the directory
containing the CUPS server binaries.
'';
};
defaultShared = mkOption {
type = types.bool;
default = false;
description = ''
Specifies whether local printers are shared by default.
'';
};
browsing = mkOption {
type = types.bool;
default = false;
description = ''
Specifies whether shared printers are advertised.
'';
};
webInterface = mkOption {
type = types.bool;
default = true;
description = ''
Specifies whether the web interface is enabled.
'';
};
cupsdConf = mkOption {
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type = types.lines;
default = "";
example =
''
BrowsePoll cups.example.com
LogLevel debug
'';
description = ''
The contents of the configuration file of the CUPS daemon
(<filename>cupsd.conf</filename>).
'';
};
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cupsFilesConf = mkOption {
type = types.lines;
default = "";
description = ''
The contents of the configuration file of the CUPS daemon
(<filename>cups-files.conf</filename>).
'';
};
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extraConf = mkOption {
type = types.lines;
default = "";
example =
''
BrowsePoll cups.example.com
LogLevel debug
'';
description = ''
Extra contents of the configuration file of the CUPS daemon
(<filename>cupsd.conf</filename>).
'';
};
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clientConf = mkOption {
type = types.lines;
default = "";
example =
''
ServerName server.example.com
Encryption Never
'';
description = ''
The contents of the client configuration.
(<filename>client.conf</filename>)
'';
};
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browsedConf = mkOption {
type = types.lines;
default = "";
example =
''
BrowsePoll cups.example.com
'';
description = ''
The contents of the configuration. file of the CUPS Browsed daemon
(<filename>cups-browsed.conf</filename>)
'';
};
snmpConf = mkOption {
type = types.lines;
default = ''
Address @LOCAL
'';
description = ''
The contents of <filename>/etc/cups/snmp.conf</filename>. See "man
cups-snmp.conf" for a complete description.
'';
};
drivers = mkOption {
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type = types.listOf types.path;
example = literalExample "[ pkgs.splix ]";
description = ''
CUPS drivers to use. Drivers provided by CUPS, cups-filters, Ghostscript
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and Samba are added unconditionally.
'';
};
tempDir = mkOption {
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type = types.path;
default = "/tmp";
example = "/tmp/cups";
description = ''
CUPSd temporary directory.
'';
};
};
};
###### implementation
config = mkIf config.services.printing.enable {
users.extraUsers = singleton
{ name = "cups";
uid = config.ids.uids.cups;
group = "lp";
description = "CUPS printing services";
};
environment.systemPackages = [ cups ];
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environment.etc."cups/client.conf".text = cfg.clientConf;
environment.etc."cups/cups-files.conf".text = cfg.cupsFilesConf;
environment.etc."cups/cupsd.conf".text = cfg.cupsdConf;
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environment.etc."cups/cups-browsed.conf".text = cfg.browsedConf;
environment.etc."cups/snmp.conf".text = cfg.snmpConf;
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services.dbus.packages = [ cups ];
# Cups uses libusb to talk to printers, and does not use the
# linux kernel driver. If the driver is not in a black list, it
# gets loaded, and then cups cannot access the printers.
boot.blacklistedKernelModules = [ "usblp" ];
systemd.packages = [ cups ];
systemd.services.cups =
{ wantedBy = [ "multi-user.target" ];
wants = [ "network.target" ];
after = [ "network.target" ];
path = [ cups ];
preStart =
''
mkdir -m 0755 -p /etc/cups
mkdir -m 0700 -p /var/cache/cups
mkdir -m 0700 -p /var/spool/cups
mkdir -m 0755 -p ${cfg.tempDir}
'';
restartTriggers =
[ config.environment.etc."cups/cups-files.conf".source
config.environment.etc."cups/cupsd.conf".source
];
};
systemd.services.cups-browsed = mkIf config.services.avahi.enable
{ description = "CUPS Remote Printer Discovery";
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wantedBy = [ "multi-user.target" ];
wants = [ "cups.service" "avahi-daemon.service" ];
bindsTo = [ "cups.service" "avahi-daemon.service" ];
partOf = [ "cups.service" "avahi-daemon.service" ];
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after = [ "cups.service" "avahi-daemon.service" ];
path = [ cups ];
serviceConfig.ExecStart = "${cups_filters}/bin/cups-browsed";
restartTriggers =
[ config.environment.etc."cups/cups-browsed.conf".source
];
};
services.printing.drivers =
[ cups pkgs.ghostscript pkgs.cups_filters additionalBackends
pkgs.perl pkgs.coreutils pkgs.gnused pkgs.bc pkgs.gawk pkgs.gnugrep
];
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services.printing.cupsFilesConf =
''
SystemGroup root wheel
ServerBin ${bindir}/lib/cups
DataDir ${bindir}/share/cups
AccessLog syslog
ErrorLog syslog
PageLog syslog
TempDir ${cfg.tempDir}
# User and group used to run external programs, including
# those that actually send the job to the printer. Note that
# Udev sets the group of printer devices to `lp', so we want
# these programs to run as `lp' as well.
User cups
Group lp
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'';
services.printing.cupsdConf =
''
LogLevel info
${concatMapStrings (addr: ''
Listen ${addr}
'') cfg.listenAddresses}
Listen /var/run/cups/cups.sock
SetEnv PATH ${bindir}/lib/cups/filter:${bindir}/bin:${bindir}/sbin
DefaultShared ${if cfg.defaultShared then "Yes" else "No"}
Browsing ${if cfg.browsing then "Yes" else "No"}
WebInterface ${if cfg.webInterface then "Yes" else "No"}
DefaultAuthType Basic
<Location />
Order allow,deny
Allow localhost
</Location>
<Location /admin>
Order allow,deny
Allow localhost
</Location>
<Location /admin/conf>
AuthType Basic
Require user @SYSTEM
Order allow,deny
Allow localhost
</Location>
<Policy default>
<Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job CUPS-Move-Job>
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit Pause-Printer Resume-Printer Set-Printer-Attributes Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After CUPS-Add-Printer CUPS-Delete-Printer CUPS-Add-Class CUPS-Delete-Class CUPS-Accept-Jobs CUPS-Reject-Jobs CUPS-Set-Default>
AuthType Basic
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Cancel-Job CUPS-Authenticate-Job>
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit All>
Order deny,allow
</Limit>
</Policy>
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${cfg.extraConf}
'';
security.pam.services.cups = {};
};
}