install-iso: use disko.makeDiskImage

flake-parts/packages.nix

@@ -6,11 +6,12 @@
         modules = [
           self.nixosModules.installer
           self.inputs.nixos-generators.nixosModules.all-formats
+          self.inputs.disko.nixosModules.disko
         ];
       };
     in
     {
-      install-iso = installer.config.formats.install-iso;
+      install-iso = self.inputs.disko.lib.lib.makeDiskImage { nixosConfig = installer; };
       install-vm-nogui = installer.config.formats.vm-nogui;
       install-vm = installer.config.formats.vm;
     };

flake.lock

@@ -1,5 +1,25 @@
 {
   "nodes": {
+    "disko": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1690548222,
+        "narHash": "sha256-EcVjLOpbAuL/y55fLlEl3BNM4FP5Pwtp+6DbTiL6FDM=",
+        "owner": "nix-community",
+        "repo": "disko",
+        "rev": "43f17a8b31c49f6696b8b258d317161afdc7e36b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "disko",
+        "type": "github"
+      }
+    },
     "flake-parts": {
       "inputs": {
         "nixpkgs-lib": [
@@ -74,6 +94,7 @@
     },
     "root": {
       "inputs": {
+        "disko": "disko",
         "flake-parts": "flake-parts",
         "nixos-generators": "nixos-generators",
         "nixpkgs": "nixpkgs",

flake.nix

@@ -3,6 +3,8 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    disko.url = "github:nix-community/disko";
+    disko.inputs.nixpkgs.follows = "nixpkgs";
     nixos-generators.url = "github:nix-community/nixos-generators";
     nixos-generators.inputs.nixpkgs.follows = "nixpkgs";
     flake-parts.url = "github:hercules-ci/flake-parts";

modules/installer.nix

@@ -1,10 +1,16 @@
 { lib
 , pkgs
+, modulesPath
 , ...
 }: {
   systemd.tmpfiles.rules = [
     "d /var/shared 0777 root root - -"
   ];
+  imports = [
+    (modulesPath + "/profiles/installation-device.nix")
+    (modulesPath + "/profiles/all-hardware.nix")
+    (modulesPath + "/profiles/base.nix")
+  ];
   services.openssh.settings.PermitRootLogin = "yes";
   system.activationScripts.root-password = ''
     mkdir -p /var/shared
@@ -34,7 +40,41 @@
       cat /var/shared/qrcode.utf8
     fi
   '';
-  formatConfigs.install-iso = {
-    isoImage.squashfsCompression = "zstd -Xcompression-level 1";
+  boot.loader.grub.efiInstallAsRemovable = true;
+  boot.loader.grub.efiSupport = true;
+  disko.devices = {
+    disk = {
+      stick = {
+        type = "disk";
+        device = "/vda";
+        imageSize = "3G";
+        content = {
+          type = "gpt";
+          partitions = {
+            boot = {
+              size = "1M";
+              type = "EF02"; # for grub MBR
+            };
+            ESP = {
+              size = "100M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+              };
+            };
+            root = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "ext4";
+                mountpoint = "/";
+              };
+            };
+          };
+        };
+      };
+    };
   };
 }