Added disko config

flake.nix

@@ -1,3 +1,32 @@
+{
+  description = "BTCPay server, NBXplorer, Bitcoin Core, etc. as a NixOS system/container image with disko";
+
+  inputs = {
+    nix-bitcoin.url = "github:fort-nix/nix-bitcoin/release";
+    nixpkgs.follows = "nix-bitcoin/nixpkgs";
+    nixos-generators.url = "github:nix-community/nixos-generators";
+    flake-utils.url = "github:numtide/flake-utils";
+    disko.url = "github:nix-community/disko";
+    disko.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    nix-bitcoin,
+    nixos-generators,
+    flake-utils,
+    disko,
+    ...
+  }: let
+    system = "x86_64-linux";
+    pkgs = import nixpkgs {inherit system;};
+  in {
+    nixosConfigurations.btc-pay-server = pkgs.lib.nixosSystem {
+      inherit system;
+      modules = [
+        nix-bitcoin.nixosModules.default
+        disko.nixosModules.default
         ({
           config,
           pkgs,
@@ -8,7 +37,60 @@
 
           nix-bitcoin.generateSecrets = true;
 
-  # Enable core services
+          disko.devices = {
+            disk.root = {
+              device = "/dev/sda";
+              format = "gpt";
+              partitions = {
+                ESP = {
+                  size = "512M";
+                  type = "EF00";
+                  format = "vfat";
+                  content = {
+                    type = "filesystem";
+                    mountpoint = "/boot";
+                  };
+                };
+                root = {
+                  size = "100%";
+                  content = {
+                    type = "lvm_pv";
+                    vg = "root_vg";
+                  };
+                };
+              };
+            };
+            lvm_vg.root_vg = {
+              type = "lvm_vg";
+              lvs = {
+                root = {
+                  size = "100%FREE";
+                  content = {
+                    type = "filesystem";
+                    format = "ext4";
+                    mountpoint = "/";
+                    mountOptions = ["defaults"];
+                  };
+                };
+              };
+            };
+            disk.data = {
+              device = "/dev/sdb";
+              format = "gpt";
+              partitions = {
+                data = {
+                  size = "100%";
+                  type = "8300"; # Linux filesystem
+                  format = "xfs";
+                  mountpoint = "/var/lib/bitcoind";
+                  options = ["noatime"];
+                };
+              };
+              growPartition = true; # Enables growpart for resizing
+            };
+          };
+          growpart.enable = true; # Enables the growpart service
+
           services.bitcoind = {
             enable = true;
             dataDir = "/var/lib/bitcoind";
@@ -52,7 +134,6 @@
             lightningBackend = "clightning";
           };
 
-  # Firewall: Open necessary ports
           networking.firewall.allowedTCPPorts = [
             config.services.btcpayserver.port
             config.services.bitcoind.port
@@ -60,7 +141,6 @@
             22
           ];
 
-  # SSH setup
           services.openssh = {
             enable = true;
             settings = {
@@ -77,3 +157,21 @@
 
           system.stateVersion = "25.05";
         })
+      ];
+    };
+
+    devShells = flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {inherit system;};
+    in {
+      default = pkgs.mkShell {
+        buildInputs = [
+          nixos-generators.packages.${system}.nixos-generate
+          pkgs.just
+        ];
+        shellHook = ''
+          echo "💚 Devshell ready: nixos-generate, just available."
+        '';
+      };
+    });
+  };
+}