From cb439311660906c33ef257115cc25b3b27c34386 Mon Sep 17 00:00:00 2001
From: Nathan McCarty <thatonelutenist@stranger.systems>
Date: Thu, 17 Apr 2025 13:03:48 -0400
Subject: [PATCH 1/2] Configure builders-use-substitutes

---
 nixos/modules/base.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nixos/modules/base.nix b/nixos/modules/base.nix
index b7788cc..a8da9b8 100644
--- a/nixos/modules/base.nix
+++ b/nixos/modules/base.nix
@@ -39,4 +39,6 @@
 "https://nix-community.cachix.org"
     ];
   };
+  # Remote builds should use subsitutors
+  nix.extraOptions = "builders-use-substitutes = true";
 }

From cf5c5bd0fd51a132a1af3e6b2260760ec936bac9 Mon Sep 17 00:00:00 2001
From: Nathan McCarty <thatonelutenist@stranger.systems>
Date: Thu, 17 Apr 2025 13:11:49 -0400
Subject: [PATCH 2/2] Garbage collect driftwood

---
 nixos/machines/driftwood/configuration.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nixos/machines/driftwood/configuration.nix b/nixos/machines/driftwood/configuration.nix
index 0b479ad..6df213e 100644
--- a/nixos/machines/driftwood/configuration.nix
+++ b/nixos/machines/driftwood/configuration.nix
@@ -77,4 +77,11 @@
       upper = "05:00";
     };
   };
+
+  # Setup garbage collection, keep the past month
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+      options = "--delete-older-than 30d";
+  };
 }