modules/steamos: add earlyoom

modules/steamos/default.nix

@@ -11,6 +11,7 @@ in
     ./automount.nix
     ./bluetooth.nix
     ./boot.nix
+    ./earlyoom.nix
     ./mesa.nix
     ./misc.nix
     ./sysctl.nix

modules/steamos/earlyoom.nix

@@ -0,0 +1,28 @@
+{ config, lib, ... }:
+
+let
+  inherit (lib)
+    mkIf
+    mkOption
+    types
+  ;
+  cfg = config.jovian.steamos;
+in
+{
+  options.jovian.steamos.enableEarlyOOM = mkOption {
+    default = cfg.useSteamOSConfig;
+    defaultText = lib.literalExpression "config.jovian.steamos.useSteamOSConfig";
+    type = types.bool;
+    description = ''
+      Enable SteamOS-like earlyoom config.
+    '';
+  };
+
+  config = mkIf (cfg.enableEarlyOOM) {
+    # Match vendor settings: https://github.com/Jovian-Experiments/PKGBUILDs-mirror/blob/holo-main/holo-earlyoom/holo-earlyoom.systemd.conf
+    services.earlyoom = {
+      enable = lib.mkDefault true;
+      extraArgs = lib.mkDefault [ "-M" "409600,307200" "-S" "409600,307200" ];
+    };
+  };
+}

support/manifest/mappings.toml

@@ -101,6 +101,8 @@ grub.ignore = true
 # we use nixos config
 holo-dmi-rules.check = "1.0-2"
 
+holo-earlyoom.check = "1.0-1"
+
 # unused, check in case it ever becomes used again
 holo-fstab-repair.check = "0.1-1"