From 36a2b1aeace22517b396d9ff502fa532d173cac0 Mon Sep 17 00:00:00 2001
From: Ethel Morgan <eth@ethulhu.co.uk>
Date: Wed, 1 Jul 2020 15:48:24 +0100
Subject: move overlays module to a general nix one

---
 nixos/modules/module-list.nix |  2 +-
 nixos/modules/nix.nix         | 54 +++++++++++++++++++++++++++++++++++++++++++
 nixos/modules/overlays.nix    | 22 ------------------
 3 files changed, 55 insertions(+), 23 deletions(-)
 create mode 100644 nixos/modules/nix.nix
 delete mode 100644 nixos/modules/overlays.nix

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 001f376..b0d788c 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -2,7 +2,7 @@
   ./hardware/keyboard.nix
   ./hardware/linode.nix
   ./hardware/yubikey.nix
-  ./overlays.nix
+  ./nix.nix
   ./programs/dwm.nix
   ./services/ambience.nix
   ./services/catbus-lgtv.nix
diff --git a/nixos/modules/nix.nix b/nixos/modules/nix.nix
new file mode 100644
index 0000000..635a96b
--- /dev/null
+++ b/nixos/modules/nix.nix
@@ -0,0 +1,54 @@
+{ config, lib, pkgs, ... }:
+with lib;
+
+let
+  cfg = config.eth.nix;
+
+  mozilla = import (builtins.fetchTarball
+    "https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz");
+
+  eth = import ../../pkgs;
+
+in {
+  options.eth.nix = {
+    allowUnfree = mkOption {
+      type = types.bool;
+      description = "Allow non-free software.";
+      default = false;
+    };
+
+    gc = {
+      enable = mkEnableOption "Enable the garbage collector.";
+      schedule = mkOption {
+        type = types.str;
+        default = config.nix.gc.dates;
+        description = "A systemd.time(7) timespec";
+      };
+      olderThan = mkOption {
+        type = types.str;
+        default = "30d";
+        description = "Garbage-collect NixOS configurations older than this.";
+      };
+    };
+
+    overlays = {
+      eth     = mkEnableOption "Eth (yours truly)";
+      mozilla = mkEnableOption "Mozilla (Rust, Firefox, etc)";
+    };
+  };
+
+  config = {
+    nixpkgs.config.allowUnfree = cfg.allowUnfree;
+
+    nix.gc = {
+      automatic = cfg.gc.enable;
+      dates = cfg.gc.schedule;
+      options = "--delete-older-than ${cfg.gc.olderThan}";
+    };
+
+    nixpkgs.overlays = builtins.concatLists [
+      ( if cfg.overlays.eth     then [ eth     ] else [] )
+      ( if cfg.overlays.mozilla then [ mozilla ] else [] )
+    ];
+  };
+}
diff --git a/nixos/modules/overlays.nix b/nixos/modules/overlays.nix
deleted file mode 100644
index 7820e96..0000000
--- a/nixos/modules/overlays.nix
+++ /dev/null
@@ -1,22 +0,0 @@
-{ config, lib, pkgs, ... }:
-with lib;
-
-let
-  cfg = config.eth.overlays;
-
-  mozilla = import (builtins.fetchTarball
-    "https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz");
-
-  eth = import ../../pkgs;
-
-in {
-  options.eth.overlays = {
-    eth     = mkEnableOption "Eth (yours truly)";
-    mozilla = mkEnableOption "Mozilla (Rust, Firefox, etc)";
-  };
-
-  config.nixpkgs.overlays = builtins.concatLists [
-    ( if cfg.eth     then [ eth     ] else [] )
-    ( if cfg.mozilla then [ mozilla ] else [] )
-  ];
-}
-- 
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