From eb557507d07ba7402ad474d2c982bc35ce649fdd Mon Sep 17 00:00:00 2001
From: Katherina Walshe-Grey <git@qenya.tel>
Date: Sun, 5 Jan 2025 14:27:55 +0000
Subject: [PATCH 1/2] misc: garbage-collect nixos profiles older than 30 days

---
 common/misc.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/common/misc.nix b/common/misc.nix
index af95d1b..3061e72 100644
--- a/common/misc.nix
+++ b/common/misc.nix
@@ -5,6 +5,7 @@
     automatic = true;
     dates = "weekly";
     randomizedDelaySec = "45min";
+    options = "--delete-older-than 30d";
   };
   nix.optimise.automatic = true;
   services.fstrim.enable = true;

From 96d16a8830b7d08a0a2f6bf4133a84e0b2f334b4 Mon Sep 17 00:00:00 2001
From: Katherina Walshe-Grey <git@qenya.tel>
Date: Sun, 5 Jan 2025 14:28:15 +0000
Subject: [PATCH 2/2] tohru: disable automatic nix store maintenance

---
 hosts/tohru/default.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hosts/tohru/default.nix b/hosts/tohru/default.nix
index cde1a8d..e4f9c8e 100644
--- a/hosts/tohru/default.nix
+++ b/hosts/tohru/default.nix
@@ -1,5 +1,8 @@
 { config, lib, pkgs, inputs, ... }:
 
+let
+  inherit (lib) mkForce;
+in
 {
   imports = [
     ./filesystems.nix
@@ -23,6 +26,11 @@
   console.keyMap = "uk";
   services.xserver.xkb.layout = "gb";
 
+  # tohru does not have the resources to run these under other load and is generally powered off when not in use.
+  # instead, just run `nix-collect-garbage -d` and `nix-store --optimise` every so often.
+  nix.gc.automatic = mkForce false;
+  nix.optimise.automatic = mkForce false;
+
   fountain.users.qenya.enable = true;
   age.secrets.user-password-tohru-qenya.file = ../../secrets/user-password-tohru-qenya.age;
   users.users.qenya.hashedPasswordFile = config.age.secrets.user-password-tohru-qenya.path;