stateVersion devrait être propre à chaque machine (fixé à l'installation)

configuration/environment.nix

@@ -9,10 +9,11 @@ in
 
 {
   # The NixOS release to be compatible with for stateful data such as databases.
-  system.stateVersion = "19.09";
+  #system.stateVersion = "19.09";
 
   # copies the NixOS configuration file (usually /etc/nixos/configuration.nix) and links it from the resulting system (getting to /run/current-system/configuration.nix)
-  system.copySystemConfiguration = true;
+  # https://github.com/NixOS/nixpkgs/issues/97252
+  #system.copySystemConfiguration = true;
 
   # On autorise les paquets non-libres
   nixpkgs.config.allowUnfree = true;

configuration/nix-options.nix

@@ -13,6 +13,7 @@ in
 
   system.autoUpgrade.enable = flags.auto-upgrade;
   nix = {
+    package = pkgs.nixUnstable;
     extraOptions = ''
       experimental-features = nix-command flakes
     '';

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1659981942,
+        "narHash": "sha256-uCFiP/B/NXOWzhN6TKfMbSxtVMk1bVnCrnJRjCF6RmU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "39d7f929fbcb1446ad7aa7441b04fb30625a4190",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,9 @@
+{
+  description = "Module NixOS de base Grudunet";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs, ... }: {
+    nixosModules.default = import ./base.nix ;
+  };
+}

lib.nix

@@ -1,5 +1,7 @@
+{pkgs, ... }:
+
 let
-  lib = with import <nixpkgs> {}; pkgs.lib;
+  lib = pkgs.lib;
 
   profiles = {
     isDesktopEnvironment = {