feat(tmp): add 'tmp' module

hosts/andromache/default.nix

@@ -91,6 +91,7 @@ in
     enable = true;
     interfaces.eno1 = { inherit (wolInterfaces.eno1) macAddress; };
   };
+  zfs.enable = true;
 
   disko.devices = {
     disk.data = {

hosts/astyanax/default.nix

@@ -67,6 +67,7 @@ in
     };
   };
   taskwarrior.enable = true;
+  zfs.enable = true;
 
   secrets.nixSigningKey.enable = true;
   restic-backup.enable = true;

modules/boot/bootloader.nix

@@ -1,11 +0,0 @@
-{ config, ... }:
-
-{
-  boot = {
-    loader = {
-      systemd-boot.enable = true;
-      efi.canTouchEfiVariables = true;
-    };
-    tmp.useTmpfs = config.host.highRam;
-  };
-}

modules/boot/default.nix

@@ -1,18 +0,0 @@
-{ lib, config, ... }:
-
-let
-  cfg = config.bootloader;
-in
-{
-  options.bootloader.enable = lib.mkEnableOption "system bootloader";
-
-  config = lib.mkIf cfg.enable {
-    boot = {
-      loader = {
-        systemd-boot.enable = true;
-        efi.canTouchEfiVariables = true;
-      };
-      tmp.useTmpfs = config.host.highRam;
-    };
-  };
-}

modules/bootloader/default.nix

@@ -0,0 +1,17 @@
+{ lib, config, ... }:
+
+{
+  options.bootloader.enable = lib.mkOption {
+    default = false;
+    type = lib.types.bool;
+  };
+
+  config = lib.mkIf config.bootloader.enable {
+    boot = {
+      loader = {
+        systemd-boot.enable = true;
+        efi.canTouchEfiVariables = true;
+      };
+    };
+  };
+}

modules/common/default.nix

@@ -12,7 +12,6 @@
 
   config = {
     system.stateVersion = lib.mkDefault "25.05";
-    boot.zfs.forceImportRoot = lib.mkDefault false;
 
     environment.defaultPackages = lib.mkForce [ ];
     environment.pathsToLink = [

modules/tmp/default.nix

@@ -0,0 +1,15 @@
+{ lib, config, ... }:
+
+{
+  options.tmp.enable = lib.mkOption {
+    default = config.host.highRam;
+    type = lib.types.bool;
+  };
+
+  config = lib.mkIf config.tmp.enable {
+    boot.tmp = {
+      useTmpfs = true;
+      tmpfsSize = "25%";
+    };
+  };
+}

modules/zfs/default.nix

@@ -0,0 +1,15 @@
+{ lib, config, ... }:
+
+{
+  options.zfs.enable = lib.mkOption {
+    default = false;
+    type = lib.types.bool;
+  };
+
+  config = lib.mkIf config.zfs.enable {
+    boot = {
+      kernelParams = [ "zfs.zfs_arc_max=12884901888" ];
+      zfs.forceImportRoot = lib.mkDefault false;
+    };
+  };
+}