From cedeb8cccb861e9ea61c967a1397db56d4b54f08 Mon Sep 17 00:00:00 2001
From: Artem Sheremet <dot.doom@gmail.com>
Date: Fri, 27 Mar 2026 13:13:08 +0000
Subject: [PATCH] Add shared modules for nix-gc and nix-settings

---
 flake.nix                | 10 ++++++++++
 modules/nix-gc.nix       |  7 +++++++
 modules/nix-settings.nix | 15 +++++++++++++++
 3 files changed, 32 insertions(+)
 create mode 100644 flake.nix
 create mode 100644 modules/nix-gc.nix
 create mode 100644 modules/nix-settings.nix

diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..694647f
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,10 @@
+{
+  description = "Shared Nix settings (NixOS, Home Manager etc)";
+
+  outputs = { self }: {
+    nixosModules = {
+      nix-settings = import ./modules/nix-settings.nix;
+      nix-gc = import ./modules/nix-gc.nix;
+    };
+  };
+}
diff --git a/modules/nix-gc.nix b/modules/nix-gc.nix
new file mode 100644
index 0000000..2397107
--- /dev/null
+++ b/modules/nix-gc.nix
@@ -0,0 +1,7 @@
+_: {
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 60d";
+  };
+}
diff --git a/modules/nix-settings.nix b/modules/nix-settings.nix
new file mode 100644
index 0000000..9a19511
--- /dev/null
+++ b/modules/nix-settings.nix
@@ -0,0 +1,15 @@
+_: {
+  nix.settings = {
+    extra-experimental-features = [
+      "nix-command"
+      "flakes"
+    ];
+
+    auto-optimise-store = true;
+
+    trusted-users = [ "@wheel" ];
+
+    # RPi builds can be slow due to compiling via binfmt.
+    download-buffer-size = 1 * 1024 * 1024 * 1024;
+  };
+}