server | add beszel agent

modules/beszel-agent.nix

@@ -0,0 +1,92 @@
+# modules/beszel-agent.nix
+{ inputs, outputs, config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.services.beszel-agent;
+in {
+  options.services.beszel-agent = {
+    enable = mkEnableOption "Beszel agent service";
+
+    # package = mkOption {
+    #   type = types.package;
+    #   default = pkgs.beszel;
+    #   description = "The beszel package to use.";
+    # };
+
+    port = mkOption {
+      type = types.port;
+      default = 45876;
+      description = "Port number for the beszel agent to listen on.";
+    };
+
+    key = mkOption {
+      type = types.str;
+      default = ''
+        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAID3EsSeb3/DaYLXkyRJqTFAh8PDo8JRPYC6X2K1U6yjW"'';
+      description = "SSH key for the beszel agent.";
+    };
+
+    extraFilesystems = mkOption {
+      type = types.listOf types.str;
+      default = [ "/" ];
+      description = "List of additional filesystems to monitor.";
+    };
+
+    user = mkOption {
+      type = types.str;
+      default = "root";
+      description = "User account under which the service runs.";
+    };
+
+    groups = mkOption {
+      type = types.listOf types.str;
+      default = [ "root" ];
+      description = "Groups under which the service runs.";
+    };
+
+    restartSec = mkOption {
+      type = types.int;
+      default = 5;
+      description = "Time to wait before restarting the service.";
+    };
+
+    gpu = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Sets env var to enable GPU monitoring.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    # users.users.${cfg.user} = {
+    #   isSystemUser = true;
+    #   group = builtins.head cfg.groups;
+    #   extraGroups = builtins.tail cfg.groups;
+    #   description = "Beszel Agent service user";
+    # };
+
+    # #users.groups.${cfg.group} = {};
+    # users.groups = builtins.listToAttrs (map (g: { name = g; value = {}; }) cfg.groups);
+
+    environment.systemPackages = with pkgs; [ beszel ];
+    systemd.services.beszel-agent = {
+      description = "Beszel Agent Service";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+
+      serviceConfig = {
+        Environment = [
+          "KEY=${cfg.key}"
+          "EXTRA_FILESYSTEMS=${concatStringsSep "," cfg.extraFilesystems}"
+          "PATH=/run/current-system/sw/bin:$PATH"
+        ];
+        ExecStart = "/run/current-system/sw/bin/beszel-agent";
+        User = cfg.user;
+        Group = builtins.head cfg.groups;
+        Restart = "always";
+        RestartSec = cfg.restartSec;
+      };
+    };
+  };
+}