treewide: abstract away common configs into common/

common/pc/default.nix

@@ -0,0 +1,5 @@
+{ lib, ... }:
+
+{
+  services.xserver.libinput.enable = lib.mkDefault true;
+}

common/pc/hdd/default.nix

@@ -0,0 +1,7 @@
+{ lib, ... }:
+
+{
+  boot.kernel.sysctl = {
+    "vm.swappiness" = lib.mkDefault 10;
+  };
+}

common/pc/laptop/default.nix

@@ -0,0 +1,11 @@
+{ lib, ... }:
+
+{
+  imports = [ ../. ];
+
+  boot.kernel.sysctl = {
+    "vm.laptop_mode" = lib.mkDefault 5;
+  };
+
+  services.tlp.enable = lib.mkDefault true;
+}

common/pc/laptop/hdd/default.nix

@@ -0,0 +1,8 @@
+{ lib, ... }:
+
+{
+  imports = [ ../../hdd ];
+
+  # Hard disk protection if the laptop falls:
+  services.hdapsd.enable = lib.mkDefault true;
+}

common/pc/laptop/ssd

@@ -0,0 +1 @@
+../ssd

common/pc/ssd/default.nix

@@ -0,0 +1,7 @@
+{ lib, ... }:
+
+{
+  boot.kernel.sysctl = {
+    "vm.swappiness" = lib.mkDefault 1;
+  };
+}