From c6fb54d897ebd83ba27f3c78aafafe65c4a4338e Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Tue, 18 Aug 2026 17:38:55 +0200
Subject: ...

---
 hosts/sif/default.nix | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/hosts/sif/default.nix b/hosts/sif/default.nix
index 72cf534d..bf6ac3c4 100644
--- a/hosts/sif/default.nix
+++ b/hosts/sif/default.nix
@@ -675,6 +675,31 @@ in {
 
     home-manager.sharedModules = [ flakeInputs.nixVirt.homeModules.default ];
 
+    systemd.timers.nix-gc = lib.mkForce {
+      timerConfig = {
+        RandomizedDelaySec = "12h";
+        Persistent = true;
+        OnCalendar = "*-*-* 18:00:00 Europe/Berlin";
+      };
+      wantedBy = [ "timers.target" ];
+    };
+    systemd.services.nix-gc = lib.mkForce {
+      description = "Nix Garbage Collector";
+      serviceConfig = {
+        Type = "oneshot";
+        ExecStart = pkgs.resholve.writeScript "nix-gc" {
+          interpreter = lib.getExe pkgs.zsh;
+          inputs = [ pkgs.coreutils config.nix.package ];
+          execer = [ "cannot:${lib.getExe' config.nix.package "nix-collect-garbage"}" ];
+        } ''
+          max_size=$(($(du -bs /nix/store | cut -f 1) - 1024**4))
+          [[ $max_size -gt 0 ]] || exit 0
+          exec nix-collect-garbage -vv --max-freed $max_size --delete-older-than 30d
+        '';
+      };
+      restartIfChanged = false;
+    };
+
     system.stateVersion = "24.11";
   };
 }
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