[nix] Cleans up warnings about options and reduces duplication

system/features/audio.nix

@@ -0,0 +1,16 @@
+{ ... }: {
+  # RealtimeKit hands out realtime scheduling priority to user processes on
+  # demand, e.g. audio
+  security.rtkit.enable = true;
+
+  # Enable sound with pipewire.
+  services.pulseaudio.enable = false;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    # If you want to use JACK applications, uncomment this
+    #jack.enable = true;
+  };
+}

system/hosts/altair/configuration.nix

@@ -88,11 +88,6 @@
   # Enable touchpad support (enabled default in most desktopManager).
   # services.xserver.libinput.enable = true;
 
-  # Allow unfree packages
-  nixpkgs.config = {
-    allowUnfree = true;
-  };
-
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [

system/hosts/altair/default.nix

@@ -5,6 +5,7 @@
     ./hardware-configuration.nix
     ./qmk.nix
     ../../authorized-keys.nix
+    ../../features/audio.nix
     ../../features/gc.nix
     ../../features/gui.nix
     ../../features/container-dev.nix

system/hosts/vega/configuration.nix

@@ -57,22 +57,6 @@
   # Enable a secret manager
   services.gnome.gnome-keyring.enable = true;
 
-  # Enable sound with pipewire.
-  hardware.pulseaudio.enable = false;
-  security.rtkit.enable = true;
-  services.pipewire = {
-    enable = true;
-    alsa.enable = true;
-    alsa.support32Bit = true;
-    pulse.enable = true;
-    # If you want to use JACK applications, uncomment this
-    #jack.enable = true;
-
-    # use the example session manager (no others are packaged yet so this is enabled by default,
-    # no need to redefine it in your config for now)
-    #media-session.enable = true;
-  };
-
   # Enable touchpad support (enabled default in most desktopManager).
   # services.xserver.libinput.enable = true;
 

system/hosts/vega/default.nix

@@ -4,6 +4,7 @@
     ./configuration.nix
     ./hardware-configuration.nix
     ../../authorized-keys.nix
+    ../../features/audio.nix
     ../../features/gc.nix
     ../../features/gui.nix
     ../../features/container-dev.nix