From fa1beab7e9587143d445f3117db796125e864622 Mon Sep 17 00:00:00 2001
From: dawn <90008@gaze.systems>
Date: Mon, 1 Jun 2026 19:45:10 +0300
Subject: [PATCH] nix: add test microvm

---
 flake.lock       | 38 ++++++++++++++++++++++++++++++++++++++
 flake.nix        | 12 ++++++++++++
 nix/vms/test.nix | 31 +++++++++++++++++++++++++++++++
 3 files changed, 81 insertions(+)
 create mode 100644 nix/vms/test.nix

diff --git a/flake.lock b/flake.lock
index 13ff027f..c298a61f 100644
--- a/flake.lock
+++ b/flake.lock
@@ -181,6 +181,27 @@
         "url": "https://cdn.jsdelivr.net/npm/mermaid@11.12.3/dist/mermaid.min.js"
       }
     },
+    "microvm": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "spectrum": "spectrum"
+      },
+      "locked": {
+        "lastModified": 1779970379,
+        "narHash": "sha256-ZHsxoYXXnfJtMVh1/yY+1Eh9hHcPBhE28Qvinauh+BQ=",
+        "owner": "microvm-nix",
+        "repo": "microvm.nix",
+        "rev": "0d49083ba2d7419b22908ac392777c16df9a032e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "microvm-nix",
+        "repo": "microvm.nix",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1771848320,
@@ -210,6 +231,7 @@
         "inter-fonts-src": "inter-fonts-src",
         "lucide-src": "lucide-src",
         "mermaid-src": "mermaid-src",
+        "microvm": "microvm",
         "nixpkgs": "nixpkgs",
         "sqlite-lib-src": "sqlite-lib-src"
       }
@@ -231,6 +253,22 @@
         "type": "github"
       }
     },
+    "spectrum": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1778940603,
+        "narHash": "sha256-voSM8dZNlaOWN3kbYFky+FNY6fFQOEw0xF+ZMpZKkCQ=",
+        "ref": "refs/heads/main",
+        "rev": "367dd227f539267eae2b62770b4c17b88ac8c1f1",
+        "revCount": 1265,
+        "type": "git",
+        "url": "https://spectrum-os.org/git/spectrum"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://spectrum-os.org/git/spectrum"
+      }
+    },
     "sqlite-lib-src": {
       "flake": false,
       "locked": {
diff --git a/flake.nix b/flake.nix
index f82ce1f7..4d92534d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,6 +3,10 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    microvm = {
+      url = "github:microvm-nix/microvm.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     fenix = {
       url = "github:nix-community/fenix";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -69,6 +73,7 @@
     ibm-plex-mono-src,
     actor-typeahead-src,
     mermaid-src,
+    microvm,
     ...
   }: let
     supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
@@ -184,6 +189,8 @@
           # };
         };
       };
+
+      microvm-test = self.nixosConfigurations.microvm-test.config.microvm.declaredRunner;
     });
     defaultPackage = forAllSystems (system: self.packages.${system}.appview);
     devShells = forAllSystems (system: let
@@ -406,5 +413,10 @@
     };
 
     formatter = forAllSystems (system: self.packages.${system}.treefmt-wrapper);
+
+    nixosConfigurations.microvm-test = import ./nix/vms/test.nix {
+      inherit nixpkgs microvm;
+      system = "x86_64-linux";
+    };
   };
 }
diff --git a/nix/vms/test.nix b/nix/vms/test.nix
new file mode 100644
index 00000000..ddc96cf3
--- /dev/null
+++ b/nix/vms/test.nix
@@ -0,0 +1,31 @@
+{ nixpkgs, microvm, system }:
+nixpkgs.lib.nixosSystem {
+  inherit system;
+  modules = [
+    microvm.nixosModules.microvm
+    {
+      networking.hostName = "my-microvm";
+      users.users.root.password = "";
+      microvm = {
+        volumes = [ {
+          mountPoint = "/var";
+          image = "var.img";
+          size = 256;
+        } ];
+        shares = [ {
+          # use proto = "virtiofs" for MicroVMs that are started by systemd
+          proto = "9p";
+          tag = "ro-store";
+          # a host's /nix/store will be picked up so that no
+          # squashfs/erofs will be built for it.
+          source = "/nix/store";
+          mountPoint = "/nix/.ro-store";
+        } ];
+
+        # "qemu" has 9p built-in!
+        hypervisor = "qemu";
+        socket = "control.socket";
+      };
+    }
+  ];
+}
-- 
2.51.2