Refactor lidarr-mb-gap NixOS module to use configurable home directory

- Introduced a `home` option for the lidarr-mb-gap service, allowing users to specify a custom home directory.
- Updated paths for `reportDir`, `envFile`, and `sshKeyFile` to be relative to the new `home` option, enhancing flexibility and maintainability.
- Adjusted systemd tmpfiles rules and user home directory settings to align with the new configuration structure.

nixos/lidarr-mb-gap.nix

@@ -6,8 +6,7 @@
 }:
 
 let
-  reportDir = "/var/lib/lidarr-mb-gap/reports";
-  envFile = "/var/lib/lidarr-mb-gap/.env";
+  defaultHome = "/var/lib/lidarr-mb-gap";
 
   # Determine which package to use
   lidarrMbGapPackage =
@@ -25,6 +24,12 @@ in
   options.services.lidarr-mb-gap = {
     enable = lib.mkEnableOption "Lidarr MusicBrainz Gap Reporter";
 
+    home = lib.mkOption {
+      type = lib.types.str;
+      default = defaultHome;
+      description = "Home directory for the lidarr-mb-gap user";
+    };
+
     package = lib.mkOption {
       type = lib.types.nullOr lib.types.package;
       default = null;
@@ -39,13 +44,15 @@ in
 
     reportDir = lib.mkOption {
       type = lib.types.str;
-      default = reportDir;
+      default = "${config.services.lidarr-mb-gap.home}/reports";
+      defaultText = lib.literalExpression ''"''${home}/reports"'';
       description = "Directory where reports will be generated";
     };
 
     envFile = lib.mkOption {
       type = lib.types.str;
-      default = envFile;
+      default = "${config.services.lidarr-mb-gap.home}/.env";
+      defaultText = lib.literalExpression ''"''${home}/.env"'';
       description = "Path to .env file with LIDARR_URL and LIDARR_API_KEY";
     };
 
@@ -80,9 +87,10 @@ in
     };
     
     sshKeyFile = lib.mkOption {
-      type = lib.types.nullOr lib.types.str;
-      default = null;
-      description = "Path to SSH private key file for rsync. If null, uses default SSH key location.";
+      type = lib.types.str;
+      default = "${config.services.lidarr-mb-gap.home}/.ssh/id_ed25519";
+      defaultText = lib.literalExpression ''"''${home}/.ssh/id_ed25519"'';
+      description = "Path to SSH private key file for rsync";
     };
 
     sshKnownHosts = lib.mkOption {
@@ -108,13 +116,13 @@ in
   config = lib.mkIf config.services.lidarr-mb-gap.enable {
     systemd.tmpfiles.rules = [
       "d ${config.services.lidarr-mb-gap.reportDir} 0755 lidarr-mb-gap lidarr-mb-gap -"
-      "d /var/lib/lidarr-mb-gap/.ssh 0700 lidarr-mb-gap lidarr-mb-gap -"
+      "d ${config.services.lidarr-mb-gap.home}/.ssh 0700 lidarr-mb-gap lidarr-mb-gap -"
     ];
 
     users.users.lidarr-mb-gap = {
       isSystemUser = true;
       group = "lidarr-mb-gap";
-      home = "/var/lib/lidarr-mb-gap";
+      home = config.services.lidarr-mb-gap.home;
       createHome = true;
     };
 
@@ -150,10 +158,7 @@ in
             (config.services.lidarr-mb-gap.syncToVPS && config.services.lidarr-mb-gap.vpsHost != null)
             ''
               # Set up SSH options
-              SSH_OPTS=""
-              ${lib.optionalString (config.services.lidarr-mb-gap.sshKeyFile != null) ''
               SSH_OPTS="-i ${config.services.lidarr-mb-gap.sshKeyFile}"
-              ''}
 
               # Use SSH options with rsync (use full path to ssh)
               ${pkgs.rsync}/bin/rsync -avz --delete \