1 files changed, 25 insertions, 0 deletions

diff --git a/hosts/skadhi/default.nix b/hosts/skadhi/default.nix
index 5a1e9366..cf25777b 100644
--- a/hosts/skadhi/default.nix
+++ b/hosts/skadhi/default.nix
@@ -89,5 +89,30 @@
       HandleLidSwitch = "sleep";
       HandleLidSwitchExternalPower = "ignore";
     };
+
+    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;
+    };
   };
 }