add vm configuration

flake.lock

@@ -0,0 +1,57 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1617673944,
+        "narHash": "sha256-0GYlbpsmTvt0jUUM47MfCLqBZBBsOqj1lwo4a/anQfY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "7d10c949fa3cb4d9f44e6a8017b89f55bf58f07d",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "stable2009": "stable2009",
+        "unstable": "unstable"
+      }
+    },
+    "stable2009": {
+      "locked": {
+        "lastModified": 1617542311,
+        "narHash": "sha256-YbYqpUA8EChwUaUSj8wIukv9ieFQdUnSSm5RypghNBA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "91b77fe6942fe999b1efbe906dc98024d1917c0d",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-20.09",
+        "type": "indirect"
+      }
+    },
+    "unstable": {
+      "locked": {
+        "lastModified": 1617082367,
+        "narHash": "sha256-W0cQPGjc4IVzryaGycuoS8KZkXafS1P23w/fcKLoD5Y=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "04a2b269d8921505a2969fc9ec25c1f517f2b307",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -1,8 +1,12 @@
 {
-  outputs = { self, nixpkgs }: {
+  inputs.unstable.url = "nixpkgs/nixos-unstable";
+  inputs.stable2009.url = "nixpkgs/nixos-20.09";
+
+  outputs = { self, nixpkgs, ... }@inputs: {
     nixosModule = { ... }: {
       imports = [ ./. ];
       config = { sconfig.flakes.enable = true; };
     };
+    nixosConfigurations = import ./hosts { inherit (inputs) unstable stable2009; };
   };
 }

hosts/configuration_vm.nix

@@ -0,0 +1,7 @@
+{ ... }:
+{
+  networking.hostName = "vm";
+  sconfig.profile = "server";
+  boot.loader.grub.device = "/dev/vda";
+  fileSystems."/" = { device = "/dev/vda1"; fsType = "ext4"; };
+}

hosts/default.nix

@@ -0,0 +1,24 @@
+{ unstable, stable2009 }:
+let
+  mkStandardSystem = { name, pkgs }: pkgs.lib.nixosSystem {
+    system = "x86_64-linux";
+    modules = [
+      pkgs.nixosModules.notDetected
+      (./. + "/configuration_${name}.nix")
+      ../.
+    ];
+  };
+
+  mkQemuSystem = { name, pkgs }: pkgs.lib.nixosSystem {
+    system = "x86_64-linux";
+    modules = [
+      ({ modulesPath, ... }: { imports = [ "${modulesPath}/profiles/qemu-guest.nix" ]; })
+      (./. + "/configuration_${name}.nix")
+      ../.
+    ];
+  };
+
+in
+{
+  vm = mkQemuSystem { name = "vm"; pkgs = unstable; };
+}