From 797253fe537c7f862f8078947497951ef7e07309 Mon Sep 17 00:00:00 2001
From: Daniel Langbein <daniel@systemli.org>
Date: Sun, 5 Nov 2023 17:21:29 +0100
Subject: [PATCH] periodic wakeup from suspend

---
 hosts/yodaHedgehog/configuration.nix |  2 +-
 hosts/yodaHedgehog/host-specific.nix | 32 +++++++++++++++++++++++++++-
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/hosts/yodaHedgehog/configuration.nix b/hosts/yodaHedgehog/configuration.nix
index b50c69a..ca7b97b 100644
--- a/hosts/yodaHedgehog/configuration.nix
+++ b/hosts/yodaHedgehog/configuration.nix
@@ -50,7 +50,7 @@
       #../../modules/ntfs.nix
       #../../modules/veracrypt.nix
       #../../modules/btrbk
-      #../../modules/spin-down.nix # TODO
+      #../../modules/spin-down.nix
 
       ../../modules/btrfs-scrub.nix
       ../../modules/btrfs-mount-options.nix
diff --git a/hosts/yodaHedgehog/host-specific.nix b/hosts/yodaHedgehog/host-specific.nix
index 0967ef4..c5e0144 100644
--- a/hosts/yodaHedgehog/host-specific.nix
+++ b/hosts/yodaHedgehog/host-specific.nix
@@ -1 +1,31 @@
-{}
+{ config, pkgs, ... }:
+
+{
+  # Suspend system:
+  #   sudo systemctl suspend
+
+  # Power consumption:
+  #   2.4W powered off
+  #   2.6W suspended, with 1 RAM, 1 SSD
+
+  # journalctl -u regular-wakeup
+
+  systemd.timers."regular-wakeup" = {
+    wantedBy = [ "multi-user.target" ];
+    timerConfig = {
+      OnCalendar = [
+        # Testing
+        "Sun 16:15:00"
+        # Daily
+        # *-*-* 00:00:05
+      ];
+      WakeSystem = true;
+      };
+   };
+  systemd.services."regular-wakeup" = {
+    script = ''
+      set -eu -o pipefail
+      printf '%s%s\n' 'Wokeup at ' "$(date)"
+    '';
+  };
+}