m/common/base.nix

@@ -3,6 +3,7 @@
   # Includes the basic configuration for an Intel server.
   imports = [
     ./base/agenix.nix
+    ./base/always-power-on.nix
     ./base/august-shutdown.nix
     ./base/boot.nix
     ./base/env.nix

m/common/base/always-power-on.nix

@@ -0,0 +1,8 @@
+{
+  imports = [
+    ../../module/power-policy.nix
+  ];
+
+  # Turn on as soon as we have power
+  power.policy = "always-on";
+}

m/common/base/august-shutdown.nix

@@ -1,12 +1,12 @@
 {
-  # Shutdown all machines on August 2nd at 11:00 AM, so we can protect the
+  # Shutdown all machines on August 3rd at 22:00, so we can protect the
   # hardware from spurious electrical peaks on the yearly electrical cut for
   # manteinance that starts on August 4th.
   systemd.timers.august-shutdown = {
-    description = "Shutdown on August 2nd for maintenance";
+    description = "Shutdown on August 3rd for maintenance";
     wantedBy = [ "timers.target" ];
     timerConfig = {
-      OnCalendar = "*-08-02 11:00:00";
+      OnCalendar = "*-08-03 22:00:00";
       RandomizedDelaySec = "10min";
       Unit = "systemd-poweroff.service";
     };

m/fox/configuration.nix

@@ -8,6 +8,10 @@
     ../module/nvidia.nix
   ];
 
+  # Don't turn off on August as UPC has different dates.
+  # Fox works fine on power cuts.
+  systemd.timers.august-shutdown.enable = false;
+
   # Select the this using the ID to avoid mismatches
   boot.loader.grub.device = "/dev/disk/by-id/wwn-0x500a07514b0c1103";
 

m/module/power-policy.nix

@@ -0,0 +1,31 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.power.policy;
+in
+{
+  options = {
+    power.policy = mkOption {
+      type = 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";
+        StartLimitBurst = "10";
+        StartLimitIntervalSec = "10m";
+      };
+    };
+  };
+}