copie de configuration.nix par nix dans l'environement courant

public/environment.nix

@@ -14,6 +14,9 @@ in
   # The NixOS release to be compatible with for stateful data such as databases.
   system.stateVersion = "16.03";
 
+  #  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;
+
   # On autorise les paquets non-libres
   nixpkgs.config.allowUnfree = true;