nixos/fprintd: add service and pam support

nixos/modules/services/security/fprintd.nix

@@ -0,0 +1,53 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.fprintd;
+
+in
+
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.fprintd = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable fprintd daemon and PAM module for fingerprint readers handling.
+        '';
+      };
+
+    };
+    
+  };
+  
+  
+  ###### implementation
+  
+  config = mkIf cfg.enable {
+
+    services.dbus.packages = [ pkgs.fprintd ];
+
+    environment.systemPackages = [ pkgs.fprintd ];
+
+    systemd.services.fprintd = {
+      description = "Fingerprint Authentication Daemon";
+
+      serviceConfig = {
+        Type = "dbus";
+        BusName = "net.reactivated.Fprint";
+        ExecStart = "${pkgs.fprintd}/libexec/fprintd";
+      };
+    };
+
+  };
+  
+}