modules: init betanin module

modules/default.nix

@@ -2,6 +2,7 @@
   amdgpu-common = ./services/hardware/amdgpu-common.nix;
   amdgpu-fan = ./services/hardware/amdgpu-fan.nix;
   amdgpu-pwm = ./services/hardware/amdgpu-pwm.nix;
+  betanin = ./services/web-apps/betanin.nix;
   dunst = ./services/x11/dunst.nix;
   radeon-profile-daemon = ./services/hardware/radeon-profile-daemon.nix;
 }

modules/services/web-apps/betanin.nix

@@ -0,0 +1,114 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) mkIf mkOption optionalAttrs types;
+  cfg = config.services.betanin;
+
+  yaml = pkgs.formats.yaml { };
+  configFile =
+    if (cfg.beetsConfigFile != null)
+    then cfg.beetsConfigFile
+    else yaml.generate "beets-config.yaml" cfg.beetsConfig;
+
+  defaultUser = "betanin";
+  defaultGroup = "betanin";
+in
+{
+  options = {
+    services.betanin = {
+      enable = lib.mkEnableOption "betanin";
+
+      package = mkOption {
+        description = "Package containing betanin program.";
+        type = types.package;
+        default = pkgs.betanin or (import ../../.. { inherit pkgs; }).betanin;
+      };
+
+      openFirewall = mkOption {
+        description = "Open ports in the firewall for the server.";
+        type = types.bool;
+        default = false;
+      };
+
+      port = mkOption {
+        description = "Port to access betanin on.";
+        type = types.port;
+        default = 9393;
+      };
+
+      user = mkOption {
+        description = "User that the betanin program should run under.";
+        type = types.str;
+        default = defaultUser;
+      };
+
+      group = mkOption {
+        description = "Group that the betanin program should run under.";
+        type = types.str;
+        default = defaultGroup;
+      };
+
+      dataDir = mkOption {
+        description = "Directory to store application data.";
+        type = types.str;
+        default = "/var/lib/betanin";
+      };
+
+      beetsConfig = mkOption {
+        description = "beets configuration.";
+        type = yaml.type;
+        default = { };
+      };
+
+      beetsConfigFile = mkOption {
+        description = "beets configuration file.";
+        type = nullOr (either str path);
+        default = null;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [{
+      assertion = (cfg.beetsConfig == { }) != (cfg.beetsConfigFile == null);
+      message = "either services.betanin.beetsConfig or services.betanin.beetsConfigFile is required";
+    }];
+
+    networking.firwall = mkIf cfg.openFirewall {
+      allowedTCPPorts = [ cfg.port ];
+    };
+
+    systemd.services.betanin = {
+      description = "Betanin service";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "networking.target" ];
+      environment = {
+        HOME = cfg.dataDir;
+      };
+      serviceConfig = lib.mkMerge [
+        {
+          User = cfg.user;
+          Group = cfg.group;
+          ExecStart = "${cfg.package}/bin/betanin --port ${cfg.port}";
+          PrivateTmp = true;
+          Restart = "always";
+          WorkingDirectory = cfg.dataDir;
+        }
+        (mkIf (cfg.dataDir == "/var/lib/betanin") {
+          StateDirectory = "betanin";
+        })
+      ];
+    };
+
+    users.users = optionalAttrs (cfg.user == defaultUser) {
+      ${cfg.user} = {
+        isSystemUser = true;
+        group = cfg.group;
+      };
+    };
+
+    users.groups = optionalAttrs (cfg.group == defaultGroup) {
+      ${cfg.group} = { };
+    };
+  };
+}