on peut se passer de passer lib en paramètre

Makefile

@@ -23,6 +23,9 @@ full-auto: submodules-update upgrade clean optimise
 optimise:
 	$(TIME) nix-store --optimise
 
+rebuild-build:
+	$(TIME) time nixos-rebuild build --fallback  --show-trace
+
 rebuild-switch:
 	$(TIME) time nixos-rebuild switch --fallback  --show-trace
 

lib.nix

@@ -0,0 +1,30 @@
+let
+  lib = with import <nixpkgs> {}; pkgs.lib;
+
+  profiles = {
+    isDesktopEnvironment = {
+      awesome = true;
+      internetSuite = true;
+      multimediaSuite = true;
+      officeSuite = true;
+      pulseaudio = true;
+      securitySuite = true;
+    };
+    isWorkstation = {
+      graphical = true;
+      docker = true;
+    };
+    isServer = {
+    };
+  };
+
+in
+
+rec {
+  applyProfilesToDirectory = customProfiles: directory:
+    lib.mapAttrs (applyProfilesToMachine customProfiles) directory;
+
+  applyProfilesToMachine = customProfiles: machineName: machineOptions:
+    machineOptions;
+    #lib.recursiveUpdate {} machineOptions;
+}

services/hydra-build.nix

@@ -11,22 +11,32 @@ mkIf flags.hydra-builder {
 
   # Paquets
   environment.systemPackages = with pkgs; [
-    qemu
     kvm
+    qemu
+    virtualbox
   ];
 
   # Services
 
   ## Services de virtualisation utilisé pour les tests hydra
-  virtualisation.docker.enable = true;
-  virtualisation.libvirtd.enable = true;
-  virtualisation.libvirtd.enableKVM = true;
-  #virtualisation.virtualbox.guest.enable = true;
-  virtualisation.virtualbox.host.enable = true;
-  virtualisation.virtualbox.host.headless = true;
+  virtualisation = {
+    docker.enable = true;
+    libvirtd = {
+      enable = true;
+      enableKVM = true;
+    };
+    virtualbox = {
+      #guest.enable = true;
+      host.enable = true;
+      host.headless = true;
+    };
+  };
 
-  ## Ménage automatique tous les jours
-  nix.gc.automatic = true;
+  ## Ménage automatique tous les jours - Frequent garbage collection is a good idea for build machines.
+  nix.gc = {
+    automatic = true;
+    dates = "*:0/30";
+  };
 
   # users.users."hydrabld" = {
   #   description = "Execution des jobs hydra";