Add nixos-generators for making a raw installer image

flake.lock

@@ -1,5 +1,41 @@
 {
   "nodes": {
+    "nixlib": {
+      "locked": {
+        "lastModified": 1723942470,
+        "narHash": "sha256-QdSArN0xKESEOTcv+3kE6yu4B4WX9lupZ4+Htx3RXGg=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "531a2e8416a6d8200a53eddfbdb8f2c8dc4a1251",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "type": "github"
+      }
+    },
+    "nixos-generators": {
+      "inputs": {
+        "nixlib": "nixlib",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1724028932,
+        "narHash": "sha256-U11ZiQPrpIBdv7oS23bNdX9GCxe/hPf/ARr64P2Wj1Y=",
+        "owner": "nix-community",
+        "repo": "nixos-generators",
+        "rev": "5fd22603892e4ec5ac6085058ed658243143aacd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixos-generators",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1720954236,
@@ -18,6 +54,7 @@
     },
     "root": {
       "inputs": {
+        "nixos-generators": "nixos-generators",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -3,11 +3,16 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+    nixos-generators = {
+      url = "github:nix-community/nixos-generators";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs = {
     self,
     nixpkgs,
+    nixos-generators,
   } @ inputs: let
     supportedSystems = [
       "aarch64-darwin"
@@ -69,6 +74,21 @@
       '';
 
       installer-iso = inputs.self.nixosConfigurations.installer.config.system.build.isoImage;
+
+      installer-image = nixos-generators.nixosGenerate {
+        system = system;
+        specialArgs = {
+          pkgs = pkgs;
+        };
+        modules = [
+          # Pin nixpkgs to the flake input, so that the packages installed
+          # come from the flake inputs.nixpkgs.url.
+          ({ ... }: { nix.registry.nixpkgs.flake = nixpkgs; })
+          # Apply the rest of the config.
+          ./machines/installer-image
+        ];
+        format = "raw-efi";
+      };
     });
 
     apps = forAllSystems (system: {