From f3c57067635b8d24eac9c9e8b7b07f4b543bc152 Mon Sep 17 00:00:00 2001
From: Snorre <snorre@altschul.dk>
Date: Tue, 4 Mar 2025 13:45:46 +0100
Subject: [PATCH] fixed microvm

---
 flake.nix                    |  3 +--
 lib/default.nix              | 22 +++++++++++++++++-----
 modules/networking-metal.nix |  3 +--
 modules/zfs.nix              | 10 +++++++++-
 4 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/flake.nix b/flake.nix
index 64baebe..3f65c0d 100755
--- a/flake.nix
+++ b/flake.nix
@@ -50,8 +50,7 @@
         inputs.agenix.nixosModules.default
         inputs.home-manager.nixosModules.default
         inputs.simple-nixos-mailserver.nixosModule
-        inputs.microvm.nixosModules.microvm
-        {microvm.hypervisor = "qemu";}
+        inputs.microvm.nixosModules.host
       ];
     in {
       server-vm = nixpkgs.lib.nixosSystem {
diff --git a/lib/default.nix b/lib/default.nix
index 98141c1..77e66cc 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -14,15 +14,27 @@ nixpkgs.lib.extend (
         config,
       }: {microvm, ...}: {
         imports = [microvm.host];
+        microvm.hypervisor = "cloud-hypervisor";
         microvm.vms.${name} = {
           pkgs = import nixpkgs {inherit system;};
+          microvm.shares = [
+            {
+              tag = "ro-store";
+              source = "/nix/store";
+              mountPoint = "/nix/.ro-store";
+            }
+          ];
           inherit config;
-          # Host build-time reference to where the MicroVM NixOS is defined
-          # under nixosConfigurations
-          flake = self;
-          # Specify from where to let `microvm -u` update later on
-          updateFlake = "git+file:///etc/nixos";
         };
+        # Mount host /nix/store for drastically reduced image size and evaluation time
+        microvm.vms.${name}.config.shares = [
+          {
+            source = "/nix/store";
+            mountPoint = "/nix/.ro-store";
+            tag = "ro-store";
+            proto = "virtiofs";
+          }
+        ];
       };
     };
   }
diff --git a/modules/networking-metal.nix b/modules/networking-metal.nix
index 0faba8b..b472032 100644
--- a/modules/networking-metal.nix
+++ b/modules/networking-metal.nix
@@ -1,5 +1,4 @@
-{...}:
-{
+{...}: {
   networking.useDHCP = false;
 
   networking.wakeOnLan.enable = true;
diff --git a/modules/zfs.nix b/modules/zfs.nix
index 9cf6fa4..0277261 100755
--- a/modules/zfs.nix
+++ b/modules/zfs.nix
@@ -1,7 +1,15 @@
-{pkgs, ...}: {
+{
+  pkgs,
+  lib,
+  ...
+}: {
   boot.zfs.devNodes = "/dev/disk/by-path";
 
   environment.systemPackages = with pkgs; [
     zfs
   ];
+
+  # Microvm be fucking shit up
+  # fileSystems."/nix/store".fsType = lib.mkForce "zfs";
+  # fileSystems."/nix/store".device = lib.mkForce "zroot/nix/store";
 }