162 lines
4 KiB
Nix
162 lines
4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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pkg = if config.hardware.sane.snapshot
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then pkgs.sane-backends-git
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else pkgs.sane-backends;
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sanedConf = pkgs.writeTextFile {
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name = "saned.conf";
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destination = "/etc/sane.d/saned.conf";
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text = ''
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localhost
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${config.services.saned.extraConfig}
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'';
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};
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netConf = pkgs.writeTextFile {
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name = "net.conf";
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destination = "/etc/sane.d/net.conf";
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text = ''
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${lib.optionalString config.services.saned.enable "localhost"}
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${config.hardware.sane.netConf}
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'';
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};
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env = {
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SANE_CONFIG_DIR = config.hardware.sane.configDir;
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LD_LIBRARY_PATH = [ "${saneConfig}/lib/sane" ];
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};
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backends = [ pkg netConf ] ++ optional config.services.saned.enable sanedConf ++ config.hardware.sane.extraBackends;
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saneConfig = pkgs.mkSaneConfig { paths = backends; };
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enabled = config.hardware.sane.enable || config.services.saned.enable;
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in
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{
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###### interface
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options = {
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hardware.sane.enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enable support for SANE scanners.
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<note><para>
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Users in the "scanner" group will gain access to the scanner, or the "lp" group if it's also a printer.
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</para></note>
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'';
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};
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hardware.sane.snapshot = mkOption {
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type = types.bool;
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default = false;
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description = "Use a development snapshot of SANE scanner drivers.";
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};
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hardware.sane.extraBackends = mkOption {
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type = types.listOf types.path;
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default = [];
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description = ''
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Packages providing extra SANE backends to enable.
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<note><para>
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The example contains the package for HP scanners.
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</para></note>
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'';
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example = literalExample "[ pkgs.hplipWithPlugin ]";
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};
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hardware.sane.configDir = mkOption {
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type = types.str;
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internal = true;
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description = "The value of SANE_CONFIG_DIR.";
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};
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hardware.sane.netConf = mkOption {
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type = types.lines;
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default = "";
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example = "192.168.0.16";
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description = ''
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Network hosts that should be probed for remote scanners.
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'';
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};
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services.saned.enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enable saned network daemon for remote connection to scanners.
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saned would be runned from <literal>scanner</literal> user; to allow
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access to hardware that doesn't have <literal>scanner</literal> group
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you should add needed groups to this user.
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'';
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};
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services.saned.extraConfig = mkOption {
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type = types.lines;
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default = "";
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example = "192.168.0.0/24";
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description = ''
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Extra saned configuration lines.
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'';
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};
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};
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###### implementation
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config = mkMerge [
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(mkIf enabled {
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hardware.sane.configDir = mkDefault "${saneConfig}/etc/sane.d";
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environment.systemPackages = backends;
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environment.sessionVariables = env;
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services.udev.packages = backends;
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users.groups.scanner.gid = config.ids.gids.scanner;
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})
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(mkIf config.services.saned.enable {
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networking.firewall.connectionTrackingModules = [ "sane" ];
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systemd.services."saned@" = {
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description = "Scanner Service";
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environment = mapAttrs (name: val: toString val) env;
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serviceConfig = {
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User = "scanner";
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Group = "scanner";
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ExecStart = "${pkg}/bin/saned";
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};
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};
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systemd.sockets.saned = {
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description = "saned incoming socket";
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wantedBy = [ "sockets.target" ];
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listenStreams = [ "0.0.0.0:6566" "[::]:6566" ];
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socketConfig = {
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# saned needs to distinguish between IPv4 and IPv6 to open matching data sockets.
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BindIPv6Only = "ipv6-only";
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Accept = true;
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MaxConnections = 1;
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};
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};
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users.users.scanner = {
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uid = config.ids.uids.scanner;
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group = "scanner";
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};
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})
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];
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}
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