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6a22ce0edf
`lpoptions -d` sets the default printer *for this user*, while `lpadmin -d` sets the system-wide default printer.
136 lines
5.2 KiB
Nix
136 lines
5.2 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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ppdOptionsString = options: optionalString (options != {})
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(concatStringsSep " "
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(mapAttrsToList (name: value: "-o '${name}'='${value}'") options)
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);
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ensurePrinter = p: ''
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${pkgs.cups}/bin/lpadmin -p '${p.name}' -E \
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${optionalString (p.location != null) "-L '${p.location}'"} \
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${optionalString (p.description != null) "-D '${p.description}'"} \
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-v '${p.deviceUri}' \
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-m '${p.model}' \
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${ppdOptionsString p.ppdOptions}
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'';
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ensureDefaultPrinter = name: ''
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${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</command>
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and remove printers with <command>lpadmin -x <printer-name></command>.
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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 = [
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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</command> 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 = literalExample ''
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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</command> 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</command> shows suported 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 = let
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cupsUnit = if config.services.printing.startWhenNeeded then "cups.socket" else "cups.service";
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in {
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description = "Ensure NixOS-configured CUPS printers";
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wantedBy = [ "multi-user.target" ];
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requires = [ cupsUnit ];
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# in contrast to cups.socket, for cups.service, this is actually not enough,
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# as the cups service reports its activation before clients can actually interact with it.
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# Because of this, commands like `lpinfo -v` will report a bad file descriptor
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# due to the missing UNIX socket without sufficient sleep time.
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after = [ cupsUnit ];
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serviceConfig = {
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Type = "oneshot";
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};
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# sleep 10 is required to wait until cups.service is actually initialized and has created its UNIX socket file
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script = (optionalString (!config.services.printing.startWhenNeeded) "sleep 10\n")
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+ (concatMapStringsSep "\n" ensurePrinter cfg.ensurePrinters)
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+ optionalString (cfg.ensureDefaultPrinter != null) (ensureDefaultPrinter cfg.ensureDefaultPrinter);
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};
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};
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}
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