add lib/overlays.nix

2 files changed, 17 insertions, 1 deletions

diff --git a/lib/default.nix b/lib/default.nix
index 68f40ca..bb8f63a 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -15,17 +15,20 @@ in
             ./devShell.nix
             ./machines.nix
             ./nixosModules.nix
+            ./overlays.nix
             ./packages.nix
           ];
           specialArgs = {
             inherit
               self
               sources
-              pkgs
               ;
             inherit (pkgs)
               lib
               ;
+            pkgs = import pkgs.path {
+              overlays = [ self.config.outputs.overlay ];
+            };
           };
         };
     in
diff --git a/lib/overlays.nix b/lib/overlays.nix
new file mode 100644
index 0000000..7779e13
--- /dev/null
+++ b/lib/overlays.nix
@@ -0,0 +1,13 @@
+{ config, lib, pkgs, ... }:
+{
+  options = {
+    overlays = lib.mkOption {
+      type = lib.types.listOf (lib.types.functionTo (lib.types.functionTo (lib.types.lazyAttrsOf lib.types.unspecified)));
+      default = [];
+    };
+    outputs.overlay = lib.mkOption {
+      type = lib.types.functionTo (lib.types.functionTo (lib.types.lazyAttrsOf lib.types.unspecified));
+    };
+  };
+  config.outputs.overlay = lib.composeManyExtensions config.overlays;
+}