Move overlays to flake definition

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/3e52e76b70d5508f3cec70b882a29199f4d1ee85' (2023-08-31)
  → 'github:NixOS/nixpkgs/aa8aa7e2ea35ce655297e8322dc82bf77a31d04b' (2023-09-01)

configuration.nix

@@ -69,12 +69,6 @@ with pkgs;
   # Keep logs for a week
   services.journald.extraConfig = "MaxRetentionSec=1week";
 
-  # Allow propietary software and build packages with Pulseaudio support
-  nixpkgs.config = {
-    allowUnfree = true;
-    pulseaudio = true;
-  };
-
   # Scrub zpool monthly
   services.zfs.autoScrub = {
     enable = true;
@@ -177,9 +171,6 @@ with pkgs;
     ./modules/periodic.nix
     ./modules/power.nix
     ./modules/monitoring.nix
-    ./overlays/nix-direnv.nix
-    ./overlays/openconnect-sso.nix
-    ./overlays/emacs-vterm.nix
   ];
 
 }

flake.lock

@@ -131,11 +131,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1693471703,
-        "narHash": "sha256-0l03ZBL8P1P6z8MaSDS/MvuU8E75rVxe5eE1N6gxeTo=",
+        "lastModified": 1693565476,
+        "narHash": "sha256-ya00zHt7YbPo3ve/wNZ/6nts61xt7wK/APa6aZAfey0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "3e52e76b70d5508f3cec70b882a29199f4d1ee85",
+        "rev": "aa8aa7e2ea35ce655297e8322dc82bf77a31d04b",
         "type": "github"
       },
       "original": {

flake.nix

@@ -17,7 +17,7 @@
     };
     openconnect-sso = {
       url = "github:vlaci/openconnect-sso";
-      flake = false;
+      inputs.nixpkgs.follows = "nixpkgs";
     };
     cyrus-sasl-xoauth2 = {
       url = "github:robn/sasl2-oauth";
@@ -37,7 +37,18 @@
     let
       system = "x86_64-linux";
 
-      pkgs = import pkgs { inherit system; };
+      pkgs = import nixpkgs {
+        inherit system;
+        config.allowUnfree = true;
+        overlays = [
+          inputs.openconnect-sso.overlay
+          (final: prev: {
+            emacs-vterm =
+              ((pkgs.emacsPackagesFor pkgs.emacs29-pgtk).emacsWithPackages
+                (epkgs: with epkgs; [ vterm ]));
+          })
+        ];
+      };
 
       lib = nixpkgs.lib;
 

modules/development.nix

@@ -3,6 +3,7 @@
 {
   # Improve nix-shell and direnv integration
   environment.pathsToLink = [ "/share/nix-direnv" ];
+  programs.direnv.enable = true;
 
   # Set up podman
   virtualisation = {

overlays/nix-direnv.nix

@@ -1,11 +0,0 @@
-{ config, lib, pkgs, ... }:
-
-with pkgs;
-
-{
-  nixpkgs.overlays = [
-    (self: super: {
-      nix-direnv = super.nix-direnv.override { enableFlakes = true; };
-    })
-  ];
-}

overlays/openconnect-sso.nix

@@ -1,3 +0,0 @@
-{ config, lib, pkgs, inputs, ... }: {
-  nixpkgs.overlays = [ (import "${inputs.openconnect-sso}/overlay.nix") ];
-}