From 27e5ea18c9ecf664e96f93408835394385607f3f Mon Sep 17 00:00:00 2001
From: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Date: Wed, 23 Jul 2025 14:07:06 +0200
Subject: [PATCH] Add NixOS module to control power policy

---
 m/module/power-policy.nix | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 m/module/power-policy.nix

diff --git a/m/module/power-policy.nix b/m/module/power-policy.nix
new file mode 100644
index 00000000..a4df4570
--- /dev/null
+++ b/m/module/power-policy.nix
@@ -0,0 +1,29 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.power.policy;
+in
+{
+  options = {
+    power.policy = mkOption {
+      type = lib.types.nullOr (types.enum [ "always-on" "previous" "always-off" ]);
+      default = null;
+      description = "Set power policy to use via IPMI.";
+    };
+  };
+
+  config = mkIf (cfg != null) {
+    systemd.services."power-policy" = {
+      description = "Set power policy to use via IPMI";
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        ExecStart = "${pkgs.ipmitool}/bin/ipmitool chassis policy ${cfg}";
+        Type = "oneshot";
+        Restart = "on-failure";
+        RestartSec = "5s";
+      };
+    };
+  };
+}