Update NixOS readme

README.md

@@ -1,9 +1,15 @@
 # nixos
 
-My NixOS config
+## Set up virtual machine ([`disko`](https://github.com/nix-community/disko/blob/master/docs/interactive-vm.md))
+
+1. Build the virtual machine
 
 ```
-git clone https://git.hektormisplon.xyz/hektor/nix.git
+nix run -L '.#nixosConfigurations.mymachine.config.system.build.vmWithDisko'
-cd nix
+```
-sudo nix --experimental-features "nix-command flakes" run 'github:nix-community/disko/latest#disko-install' -- --flake .#vm --disk root /dev/vda
+
+2. Run the virtual machine
+
+```
+QEMU_KERNEL_PARAMS=console=ttyS0 ./result/bin/run-nixos-vm -nographic; reset
 ```

flake.lock

@@ -44,11 +44,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1759439645,
+        "lastModified": 1759580034,
-        "narHash": "sha256-oiAyQaRilPk525Z5aTtTNWNzSrcdJ7IXM0/PL3CGlbI=",
+        "narHash": "sha256-YWo57PL7mGZU7D4WeKFMiW4ex/O6ZolUS6UNBHTZfkI=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "879bd460b3d3e8571354ce172128fbcbac1ed633",
+        "rev": "3bcc93c5f7a4b30335d31f21e2f1281cba68c318",
         "type": "github"
       },
       "original": {

flake.nix

@@ -17,8 +17,8 @@
     nixosConfigurations.vm = nixpkgs.lib.nixosSystem {
       system = "x86_64-linux";
       modules = [
-        ./hosts/vm/configuration.nix
         disko.nixosModules.disko
+        ./hosts/vm/configuration.nix
         home-manager.nixosModules.home-manager {
           home-manager.useGlobalPkgs = true;
           home-manager.useUserPackages = true;

hosts/vm/configuration.nix

@@ -18,6 +18,12 @@
 
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
 
+  virtualisation.vmVariantWithDisko = {
+    virtualisation.fileSystems."/".neededForBoot = true;
+  };
+
+  disko.devices.disk.main.device = "/dev/vda";
+
   # These are needed for ZFS
 
   networking.hostId = "25698a58";

hosts/vm/disk.nix

@@ -1 +1,42 @@
-import ../../modules/disko.zfs-encrypted-root.nix
+# USAGE in your configuration.nix.
+# Update devices to match your hardware.
+# {
+#  imports = [ ./disko-config.nix ];
+#  disko.devices.disk.main.device = "/dev/sda";
+# }
+{
+  disko.devices = {
+    disk = {
+      main = {
+        type = "disk";
+        content = {
+          type = "gpt";
+          partitions = {
+            boot = {
+              size = "1M";
+              type = "EF02"; # for grub MBR
+            };
+            ESP = {
+              size = "1G";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            root = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "ext4";
+                mountpoint = "/";
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}