From ed8a392ba94613bafc439d9bfdab4e5870235471 Mon Sep 17 00:00:00 2001
From: Evie Litherland-Smith <evie.litherland-smith@ukaea.uk>
Date: Mon, 4 Sep 2023 09:00:09 +0100
Subject: [PATCH] Enable automatic store optimisation

Update automatic gc
---
 hosts/common.nix | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/hosts/common.nix b/hosts/common.nix
index 169e82d1..2a768517 100644
--- a/hosts/common.nix
+++ b/hosts/common.nix
@@ -2,15 +2,20 @@
 let flakeURL = "git+https://git.xenia.me.uk/xenia/nixos.git?ref=main";
 in {
   nix = {
-    settings.experimental-features = [ "nix-command" "flakes" ];
+    settings = {
+      experimental-features = [ "nix-command" "flakes" ];
+      auto-optimise-store = true;
+    };
     gc = {
       automatic = true;
-      dates = "daily";
-      options = "--delete-older-than 7d";
+      dates = "weekly";
+      options = "--delete-older-than 30d";
     };
     extraOptions = ''
       keep-outputs = true
       keep-derivations = true
+      min-free = ${toString (100 * 1024 * 1024)}
+      max-free = ${toString (1024 * 1024 * 1024)}
     '';
   };
   system.autoUpgrade.flake = flakeURL;