e11sync.overlay: expose a non-list

flake.nix

@@ -35,11 +35,12 @@
     geoip2-tarball,
     ...
   }: let
-    overlays = import ./overlays.nix geoip2-tarball;
+    overlay = import ./overlays.nix geoip2-tarball;
   in
     flake-utils.lib.eachDefaultSystem (system: let
       pkgs = import nixpkgs {
-        inherit system overlays;
+        inherit system;
+        overlays = [overlay];
       };
     in {
       packages = {
@@ -127,6 +128,6 @@
       };
       nixosModules.e11sync = import ./modules/e11sync geoip2-tarball;
 
-      overlays.default = overlays;
+      overlays.default = overlay;
     };
 }

modules/e11sync/default.nix

@@ -4,8 +4,8 @@ geoip2-tarball: {
   pkgs,
   ...
 }: let
-  overlays = import ../../overlays.nix geoip2-tarball;
-  pkgs1 = pkgs.extend (lib.composeManyExtensions overlays);
+  overlay = import ../../overlays.nix geoip2-tarball;
+  pkgs1 = pkgs.extend overlay;
   inherit (pkgs1) e11sync-backend e11sync-frontend;
 in {
   options.e11sync = with lib.types; {

overlays.nix

@@ -1,5 +1,4 @@
-geoip2-tarball: [
-  (_: super: let
+geoip2-tarball: (_: super: let
   withDjango5 = super.extend (
     _: super: {
       python3 = super.python3.override {
@@ -17,4 +16,3 @@ geoip2-tarball: [
   e11sync-frontend = withDjango5.callPackage ./pkgs/e11sync-frontend.nix {};
   e11sync-backend = withDjango5.callPackage ./pkgs/e11sync-backend.nix {};
 })
-]