Added module for scanbd

modules/default.nix

@@ -3,5 +3,6 @@
     #./gotosocial.nix
     ./matrix-alertmanager-receiver.nix
     #./mealie.nix
+    ./scanbd.nix
   ];
 }

modules/scanbd.nix

@@ -0,0 +1,134 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.scanbd;
+  configDir = "/etc/scanbd";
+
+  scanbdConf = pkgs.writeText "scanbd.conf"
+    ''
+      global {
+        debug = true
+        debug-level = ${toString cfg.debugLevel}
+        user = ${cfg.user}
+        group = ${cfg.group}
+        scriptdir = ${configDir}/scripts
+        pidfile = ${cfg.pidFile}
+        timeout = ${toString cfg.timeOut}
+        environment {
+          device = "SCANBD_DEVICE"
+          action = "SCANBD_ACTION"
+        }
+        multiple_actions = true
+        ${cfg.extraConfig}
+      }
+    '';
+in
+
+{
+
+  options = {
+
+    services.scanbd.enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Enable support for scanbd (scanner button daemon).
+
+        <note><para>
+          If scanbd is enabled, then saned must be disabled.
+        </para></note>
+      '';
+    };
+
+    services.scanbd.user = mkOption {
+      type = types.str;
+      default = "scanner";
+      example = "";
+      description = ''
+        scanbd daemon user name.
+      '';
+    };
+
+    services.scanbd.group = mkOption {
+      type = types.str;
+      default = "scanner";
+      example = "";
+      description = ''
+        scanbd daemon group name.
+      '';
+    };
+
+    services.scanbd.extraConfig = mkOption {
+      type = types.lines;
+      default = "";
+      example = ''
+        device canon {
+          filter = "^genesys.*"
+          desc = "Canon LIDE"
+          action file {
+            filter = "^file.*"
+            desc = "File"
+            script = "copy.script"
+          }
+        }
+      '';
+      description = ''
+        Extra configuration lines included verbatim in scanbd.conf.
+        Use e.g. in lieu of including device-specific config templates
+        under scanner.d/
+      '';
+    };
+
+    services.scanbd.pidFile = mkOption {
+      type = types.str;
+      default = "/var/run/scanbd.pid";
+      example = "";
+      description = ''
+        PID file path.
+      '';
+    };
+
+    services.scanbd.timeOut = mkOption {
+      type = types.int;
+      default = 500;
+      example = "";
+      description = ''
+        Device polling timeout (in ms).
+      '';
+    };
+
+    services.scanbd.debugLevel = mkOption {
+      type = types.int;
+      default = 3;
+      example = "";
+      description = ''
+        Debug logging (1=error, 2=warn, 3=info, 4-7=debug)
+      '';
+    };
+
+  };
+
+  ###### implementation
+  config = mkIf config.services.scanbd.enable {
+
+    users.groups.scanner.gid = config.ids.gids.scanner;
+    users.users.scanner = {
+      uid = config.ids.uids.scanner;
+      group = "scanner";
+    };
+
+    environment.etc."scanbd/scanbd.conf".source = scanbdConf;
+    environment.etc."scanbd/scripts/test.script".source = "${pkgs.scanbd}/etc/scanbd/test.script";
+
+    systemd.services.scanbd = {
+      description = "Scanner button polling service";
+      wantedBy = [ "multi-user.target" ];
+      aliases=["dbus-de.kmux.scanbd.server.service"];
+      serviceConfig = {
+        ExecStart = "${pkgs.scanbd}/bin/scanbd -f -c ${configDir}/scanbd.conf";
+      };
+    };
+  };
+}