FIX: Flake and Module for NixOS deployment (#3363)

flake.nix

@@ -139,9 +139,10 @@
             replaceVars = prev.replaceVars or (path: vars: prev.substituteAll ({ src = path; } // vars));
           };
 
+          # System-specific nixos modules to avoid circular dependency
           nixosModules.default = { pkgs, lib, config, ... }: {
             imports = [ "${./nix/modules/lnbits-service.nix}" ];
-            nixpkgs.overlays = [ self.overlays.default ];
+            nixpkgs.overlays = [ self.overlays.${system}.default ];
           };
 
           checks = { };

nix/modules/README.md

@@ -0,0 +1,213 @@
+# LNBits NixOS Installation Guide
+
+This guide shows how to install LNBits on a fresh NixOS system.
+
+## Quick Start (Recommended)
+
+Add this to your NixOS configuration (`/etc/nixos/configuration.nix`):
+
+```nix
+{ config, lib, pkgs, ... }:
+
+let
+  lnbitsFlake = builtins.getFlake "github:lnbits/lnbits";
+in
+{
+  imports = [
+    # Import LNBits service module directly from GitHub
+    "${lnbitsFlake}/nix/modules/lnbits-service.nix"
+  ];
+
+  # Enable flakes (required)
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  # Configure LNBits service
+  services.lnbits = {
+    enable = true;
+    host = "0.0.0.0";        # Listen on all interfaces
+    port = 5000;             # Default port
+    openFirewall = true;     # Open firewall port automatically
+
+    # Use package from the same flake (adjust system architecture as needed)
+    package = lnbitsFlake.packages.x86_64-linux.lnbits;
+
+    env = {
+      LNBITS_ADMIN_UI = "true";
+      # Configure your Lightning backend:
+      # LNBITS_BACKEND_WALLET_CLASS = "LndRestWallet";
+      # LND_REST_ENDPOINT = "https://localhost:8080";
+      # LND_REST_CERT = "/path/to/tls.cert";
+      # LND_REST_MACAROON = "/path/to/admin.macaroon";
+    };
+  };
+
+  # Rebuild and switch
+  # sudo nixos-rebuild switch
+}
+```
+
+> **⚠️ System Architecture Note**: The examples above use `x86_64-linux`. Replace this with your system architecture:
+>
+> - `x86_64-linux` - Intel/AMD 64-bit Linux
+> - `aarch64-linux` - ARM 64-bit Linux (e.g., Raspberry Pi 4, Apple Silicon under Linux)
+> - `x86_64-darwin` - Intel Mac
+> - `aarch64-darwin` - Apple Silicon Mac
+>
+> You can check your system with: `nix eval --impure --raw --expr 'builtins.currentSystem'`
+
+## Alternative: Using Your Own Flake
+
+Create a `flake.nix` for your system configuration:
+
+```nix
+{
+  description = "My NixOS configuration with LNBits";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+    lnbits.url = "github:lnbits/lnbits";
+  };
+
+  outputs = { self, nixpkgs, lnbits }: {
+    nixosConfigurations.myserver = nixpkgs.lib.nixosSystem {
+      system = "x86_64-linux";  # Adjust architecture as needed
+      modules = [
+        ./hardware-configuration.nix
+        {
+          services.lnbits = {
+            enable = true;
+            host = "0.0.0.0";
+            port = 5000;
+            openFirewall = true;
+            package = lnbits.packages.x86_64-linux.lnbits;  # Adjust architecture as needed
+            env = {
+              LNBITS_ADMIN_UI = "true";
+              # Add your Lightning backend configuration
+            };
+          };
+        }
+      ];
+    };
+  };
+}
+```
+
+Then deploy with:
+
+```bash
+sudo nixos-rebuild switch --flake .#myserver
+```
+
+## Configuration Options
+
+### Basic Options
+
+- `enable`: Enable the LNBits service (default: `false`)
+- `host`: Host to bind to (default: `"127.0.0.1"`)
+- `port`: Port to run on (default: `8231`)
+- `openFirewall`: Automatically open firewall port (default: `false`)
+- `user`: User to run as (default: `"lnbits"`)
+- `group`: Group to run as (default: `"lnbits"`)
+- `stateDir`: State directory (default: `"/var/lib/lnbits"`)
+
+### Environment Variables
+
+Configure LNBits through the `env` option. Common variables:
+
+```nix
+services.lnbits.env = {
+  # Admin UI
+  LNBITS_ADMIN_UI = "true";
+
+  # LND Backend Example:
+
+  # LND
+  LNBITS_BACKEND_WALLET_CLASS = "LndRestWallet";
+  LND_REST_ENDPOINT = "https://localhost:8080";
+  LND_REST_CERT = "/path/to/tls.cert";
+  LND_REST_MACAROON = "/path/to/admin.macaroon";
+};
+```
+
+See the [LNBits documentation](https://docs.lnbits.org/guide/wallets.html) for all supported backends.
+
+## State Directory Structure
+
+LNBits data is stored in `/var/lib/lnbits` (default) with this structure:
+
+```
+/var/lib/lnbits/
+├── data/                       # Application data
+│   ├── database.sqlite3        # Main database
+│   ├── ext_<extension>.sqlite3 # Extension database
+│   ├── images/                 # Uploaded images
+│   ├── logs/                   # Log files
+│   └── upgrades/               # Migration files
+└── extensions/                 # Installed extensions
+```
+
+## First Time Setup
+
+1. **Deploy the configuration:**
+
+   ```bash
+   sudo nixos-rebuild switch
+   ```
+
+2. **Check service status:**
+
+   ```bash
+   systemctl status lnbits
+   ```
+
+3. **Access the web interface:**
+
+   ```
+   http://your-server-ip:5000
+   ```
+
+4. **Follow the first-time setup wizard** to configure your Lightning backend and create your first wallet.
+
+5. **Bonus** Add Reverse Proxy with generated SSL Cert
+
+```nix
+{
+# Enable nginx
+  services.nginx = {
+    enable = true;
+
+    virtualHosts."lnbits.mydomain.com" = {
+      forceSSL = true;
+      enableACME = true;
+      locations."/" = {
+        proxyPass = "http://127.0.0.1:5000";
+        proxyWebsockets = true;
+      };
+    };
+  };
+}
+```
+
+## Troubleshooting
+
+### Service won't start
+
+```bash
+# Check service logs
+journalctl -u lnbits -f
+
+# Check if port is available
+ss -tlnp | grep 5000
+```
+
+### Can't access web interface
+
+- Ensure `openFirewall = true` is set
+- Check if the port is correct: `services.lnbits.port`
+- Verify host binding: `services.lnbits.host = "0.0.0.0"`
+
+## Further Reading
+
+- [LNBits Documentation](https://docs.lnbits.org)
+- [Lightning Wallet Configuration](https://docs.lnbits.org/guide/wallets.html)
+- [LNBits Extensions](https://docs.lnbits.org/devs/extensions.html)

nix/modules/lnbits-service.nix

@@ -35,7 +35,7 @@ in
         type = types.path;
         default = "/var/lib/lnbits";
         description = ''
-          The lnbits state directory which LNBITS_DATA_FOLDER will be set to
+          The lnbits state directory
         '';
       };
       host = mkOption {
@@ -90,6 +90,7 @@ in
 
     systemd.tmpfiles.rules = [
       "d ${cfg.stateDir}                            0700 ${cfg.user} ${cfg.group} - -"
+      "d ${cfg.stateDir}/data                       0700 ${cfg.user} ${cfg.group} - -"
     ];
 
     systemd.services.lnbits = {
@@ -99,18 +100,18 @@ in
       after = [ "network-online.target" ];
       environment = lib.mkMerge [
         {
-          LNBITS_DATA_FOLDER = "${cfg.stateDir}";
-          LNBITS_EXTENSIONS_PATH = "${cfg.stateDir}/extensions";
-          LNBITS_PATH = "${cfg.package.src}";
+          LNBITS_DATA_FOLDER = "${cfg.stateDir}/data";
+          # LNBits automatically appends '/extensions' to this path
+          LNBITS_EXTENSIONS_PATH = "${cfg.stateDir}";
         }
         cfg.env
       ];
       serviceConfig = {
         User = cfg.user;
         Group = cfg.group;
-        WorkingDirectory = "${cfg.package.src}";
-        StateDirectory = "${cfg.stateDir}";
-        ExecStart = "${lib.getExe cfg.package} --port ${toString cfg.port} --host ${cfg.host}";
+        WorkingDirectory = "${cfg.package}/lib/python3.12/site-packages";
+        StateDirectory = "lnbits";
+        ExecStart = "${cfg.package}/bin/lnbits --port ${toString cfg.port} --host ${cfg.host}";
         Restart = "always";
         PrivateTmp = true;
       };