phase 2: promote services/, tests/, patches/, lib/, scripts/

services/monero/xmrig-auto-pause.nix

@@ -0,0 +1,39 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+lib.mkIf config.services.xmrig.enable {
+  systemd.services.xmrig-auto-pause = {
+    description = "Auto-pause xmrig when other services need CPU";
+    after = [ "xmrig.service" ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      ExecStart = "${pkgs.python3}/bin/python3 ${./xmrig-auto-pause.py}";
+      Restart = "always";
+      RestartSec = "10s";
+      NoNewPrivileges = true;
+      ProtectHome = true;
+      ProtectSystem = "strict";
+      PrivateTmp = true;
+      RestrictAddressFamilies = [
+        "AF_UNIX" # systemctl talks to systemd over D-Bus unix socket
+      ];
+      MemoryDenyWriteExecute = true;
+      StateDirectory = "xmrig-auto-pause";
+    };
+    environment = {
+      POLL_INTERVAL = "3";
+      GRACE_PERIOD = "15";
+      # Background services (qbittorrent, bitmagnet, postgresql, etc.) produce
+      # 15-25% non-nice CPU during normal operation. The stop threshold must
+      # sit above transient spikes; the resume threshold must be below the
+      # steady-state floor to avoid restarting xmrig while services are active.
+      CPU_STOP_THRESHOLD = "40";
+      CPU_RESUME_THRESHOLD = "10";
+      STARTUP_COOLDOWN = "10";
+      STATE_DIR = "/var/lib/xmrig-auto-pause";
+    };
+  };
+}