From a3a64453e0ec17451a454b70d506ceceabb2ccdf Mon Sep 17 00:00:00 2001
From: Ethel Morgan <eth@ethulhu.co.uk>
Date: Mon, 18 May 2020 21:39:53 +0100
Subject: add overlays module, for convenience in setting them up

---
 module-list.nix      |  1 +
 modules/overlays.nix | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 modules/overlays.nix

diff --git a/module-list.nix b/module-list.nix
index 9981930..6f59f49 100644
--- a/module-list.nix
+++ b/module-list.nix
@@ -1,5 +1,6 @@
 [
   ./modules/keyboard.nix
   ./modules/linode.nix
+  ./modules/overlays.nix
   ./modules/yubikey.nix
 ]
diff --git a/modules/overlays.nix b/modules/overlays.nix
new file mode 100644
index 0000000..423275c
--- /dev/null
+++ b/modules/overlays.nix
@@ -0,0 +1,22 @@
+{ 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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