From f043d47382690dfdd024d6609e1ca19769db430a Mon Sep 17 00:00:00 2001
From: Florian RICHER <florian.richer@protonmail.com>
Date: Fri, 24 May 2024 23:31:04 +0200
Subject: [PATCH] Add VM conf

---
 README.md                    | 25 +++++++++++++++++++++++++
 hosts/nixos-test/default.nix | 10 ++++++++++
 2 files changed, 35 insertions(+)

diff --git a/README.md b/README.md
index 0032687..983ed12 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,31 @@ nixos-rebuild switch --flake flake_path_directory#hostname
 nix flake update --extra-experimental-features "nix-command flakes"
 ```
 
+## Configure VM
+
+Configure VM
+```nix
+users.users.<user>.initialPassword = "<password>";
+virtualisation.vmVariant = {
+  # following configuration is added only when building VM with build-vm
+  virtualisation = {
+    memorySize = <RAM in MiB>; # Use 8192MiB memory.
+    cores = <CPU Core number>;
+    # And more here https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/virtualisation/qemu-vm.nix     
+  };
+};
+```
+
+Build
+```bash
+nixos-rebuild build-vm --flake .#nixos-test
+```
+
+Run
+```bash
+./result/bin/run-nixos-vm-vm
+```
+
 ## Show changements between revisions
 
 
diff --git a/hosts/nixos-test/default.nix b/hosts/nixos-test/default.nix
index 4f14e7f..2c68260 100644
--- a/hosts/nixos-test/default.nix
+++ b/hosts/nixos-test/default.nix
@@ -30,5 +30,15 @@
     };
   };
 
+  # Configure for testing in vm
+  users.users.florian.initialPassword = "test";
+  virtualisation.vmVariant = {
+    # following configuration is added only when building VM with build-vm
+    virtualisation = {
+      memorySize = 8192; # Use 8192MiB memory.
+      cores = 8;         
+    };
+  };
+
   networking.hostName = "nixos-vm"; # Define your hostname.
 }