Add elara sas specialisation

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/elara/default.nix

@@ -8,8 +8,6 @@
       device = "/dev/disk/by-id/ata-Samsung_SSD_990_EVO_1TB_S7GCNL0XA04998F";
     })
     ./hardware
-    # elara runs on an external drive on eirene
-    ../eirene/hardware
 
     ../common/configs/system/backup
     ../common/configs/system/bluetooth

hosts/elara/hardware/default.nix

@@ -5,4 +5,15 @@
     "uas"
     "sd_mod"
   ];
+
+  services.tlp.settings.DISK_DEVICES = "sda";
+
+  # By default, this host runs on an external SSD attached to eirene...
+  imports = [ ../../eirene/hardware ];
+
+  # ...but it can also run attached to a SAS-provided laptop.
+  specialisation.sas.configuration = {
+    disabledModules = [ ../../eirene/hardware ];
+    imports = [ ./sas ];
+  };
 }

hosts/elara/hardware/sas/default.nix

@@ -0,0 +1,29 @@
+{ ... }:
+{
+  imports = [
+    ./display.nix
+  ];
+
+  hardware = {
+    enableAllFirmware = true;
+
+    cpu = {
+      cores = 8;
+      threads = 12;
+      intel.updateMicrocode = true;
+    };
+  };
+
+  boot = {
+    kernelModules = [ "kvm-intel" ];
+    initrd.kernelModules = [
+      "thunderbolt"
+      "vmd"
+      "nvme"
+    ];
+  };
+
+  powerManagement.enable = true;
+
+  services.fstrim.enable = true;
+}

hosts/elara/hardware/sas/display.nix

@@ -0,0 +1,28 @@
+{ ... }:
+{
+  boot.kernelParams = [ "video=eDP-1:1920x1200@60" ];
+
+  home-manager.sharedModules = [
+    {
+      wayland.windowManager.hyprland.settings.monitor = "eDP-1, 1920x1200@60, 0x0, 1";
+
+      programs = {
+        vscode.userSettings."window.zoomLevel" = (1.25 - 1) / 0.2;
+
+        obs-studio.resolution = {
+          base = {
+            x = 1920;
+            y = 1200;
+          };
+
+          output = {
+            x = 1920;
+            y = 1200;
+          };
+        };
+      };
+
+      theme.cursor.size = 24;
+    }
+  ];
+}