nixos: One-click install via disko-install

configurations/nixos/example/configuration.nix

@@ -1,10 +1,10 @@
-# NOTE: We expect this file to be supplanted by the original /etc/nixos/configuration.nix
+{ lib, ... }:
 {
-  # These are normally in hardware-configuration.nix
-  boot.loader.grub.device = "nodev";
-  fileSystems."/" = { device = "/dev/disk/by-label/nixos"; fsType = "btrfs"; };
+  imports = [
+    ./hardware-configuration.nix
+  ];
 
-  nixpkgs.hostPlatform = "x86_64-linux";
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   networking.hostName = "example";
 
   # Used for backwards compatibility, please read the changelog before changing.

configurations/nixos/example/disk-config.nix

@@ -0,0 +1,38 @@
+# Disko config
+{
+  disko.devices = {
+    disk = {
+      main = {
+        # When using disko-install, we will overwrite this value from the commandline
+        device = "/dev/disk/by-id/some-disk-id";
+        type = "disk";
+        content = {
+          type = "gpt";
+          partitions = {
+            MBR = {
+              type = "EF02"; # for grub MBR
+              size = "1M";
+            };
+            ESP = {
+              type = "EF00";
+              size = "500M";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+              };
+            };
+            root = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "ext4";
+                mountpoint = "/";
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}

configurations/nixos/example/hardware-configuration.nix

@@ -0,0 +1,15 @@
+# This file pertains to the use of disko & disko-install.
+#
+# If you did manual NixOS install, you may want to replace this with your /etc/nixos/hardware-configuration.nix
+{ flake, ... }:
+{
+  imports = [
+    flake.inputs.disko.nixosModules.disko
+    ./disk-config.nix
+  ];
+
+  boot.loader = {
+    systemd-boot.enable = true;
+    efi.canTouchEfiVariables = true;
+  };
+}

flake.nix

@@ -11,6 +11,10 @@
     flake-parts.url = "github:hercules-ci/flake-parts";
     nixos-unified.url = "github:srid/nixos-unified";
 
+    # NixOS specific
+    disko.url = "github:nix-community/disko";
+    disko.inputs.nixpkgs.follows = "nixpkgs";
+
     # Software inputs
     nix-index-database.url = "github:nix-community/nix-index-database";
     nix-index-database.inputs.nixpkgs.follows = "nixpkgs";