140 lines
4.9 KiB
Nix
140 lines
4.9 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.hardware.printers;
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ensurePrinter = p: let
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args = cli.toGNUCommandLineShell {} ({
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p = p.name;
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v = p.deviceUri;
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m = p.model;
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} // optionalAttrs (p.location != null) {
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L = p.location;
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} // optionalAttrs (p.description != null) {
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D = p.description;
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} // optionalAttrs (p.ppdOptions != {}) {
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o = mapAttrsToList (name: value: "${name}=${value}") p.ppdOptions;
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});
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in ''
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${pkgs.cups}/bin/lpadmin ${args} -E
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'';
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ensureDefaultPrinter = name: ''
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${pkgs.cups}/bin/lpadmin -d '${name}'
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'';
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# "graph but not # or /" can't be implemented as regex alone due to missing lookahead support
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noInvalidChars = str: all (c: c != "#" && c != "/") (stringToCharacters str);
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printerName = (types.addCheck (types.strMatching "[[:graph:]]+") noInvalidChars)
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// { description = "printable string without spaces, # and /"; };
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in {
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options = {
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hardware.printers = {
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ensureDefaultPrinter = mkOption {
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type = types.nullOr printerName;
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default = null;
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description = ''
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Ensures the named printer is the default CUPS printer / printer queue.
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'';
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};
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ensurePrinters = mkOption {
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description = ''
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Will regularly ensure that the given CUPS printers are configured as declared here.
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If a printer's options are manually changed afterwards, they will be overwritten eventually.
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This option will never delete any printer, even if removed from this list.
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You can check existing printers with {command}`lpstat -s`
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and remove printers with {command}`lpadmin -x <printer-name>`.
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Printers not listed here can still be manually configured.
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'';
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default = [];
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type = types.listOf (types.submodule {
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options = {
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name = mkOption {
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type = printerName;
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example = "BrotherHL_Workroom";
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description = ''
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Name of the printer / printer queue.
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May contain any printable characters except "/", "#", and space.
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'';
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};
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location = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "Workroom";
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description = ''
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Optional human-readable location.
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'';
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};
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description = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "Brother HL-5140";
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description = ''
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Optional human-readable description.
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'';
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};
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deviceUri = mkOption {
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type = types.str;
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example = literalExpression ''
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"ipp://printserver.local/printers/BrotherHL_Workroom"
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"usb://HP/DESKJET%20940C?serial=CN16E6C364BH"
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'';
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description = ''
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How to reach the printer.
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{command}`lpinfo -v` shows a list of supported device URIs and schemes.
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'';
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};
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model = mkOption {
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type = types.str;
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example = literalExpression ''
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"gutenprint.''${lib.versions.majorMinor (lib.getVersion pkgs.gutenprint)}://brother-hl-5140/expert"
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'';
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description = ''
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Location of the ppd driver file for the printer.
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{command}`lpinfo -m` shows a list of supported models.
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'';
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};
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ppdOptions = mkOption {
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type = types.attrsOf types.str;
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example = {
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PageSize = "A4";
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Duplex = "DuplexNoTumble";
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};
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default = {};
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description = ''
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Sets PPD options for the printer.
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{command}`lpoptions [-p printername] -l` shows supported PPD options for the given printer.
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'';
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};
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};
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});
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};
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};
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};
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config = mkIf (cfg.ensurePrinters != [] && config.services.printing.enable) {
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systemd.services.ensure-printers = {
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description = "Ensure NixOS-configured CUPS printers";
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wantedBy = [ "multi-user.target" ];
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wants = [ "cups.service" ];
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after = [ "cups.service" ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = concatStringsSep "\n" [
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(concatMapStrings ensurePrinter cfg.ensurePrinters)
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(optionalString (cfg.ensureDefaultPrinter != null)
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(ensureDefaultPrinter cfg.ensureDefaultPrinter))
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# Note: if cupsd is "stateless" the service can't be stopped,
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# otherwise the configuration will be wiped on the next start.
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(optionalString (with config.services.printing; startWhenNeeded && !stateless)
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"systemctl stop cups.service")
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];
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};
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};
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}
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