refactor(grfn): Stop importing nixpkgs a bunch of times

Once is enough!

<grfn> https://tazj.in/blobs/touch-garbage.jpg

Change-Id: I68f66669e82d35a71752638450fa4b820e137172
Signed-Off-By: Florian Klink <flokli@flokli.de>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3048
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

users/grfn/system/home/common/legacy-dotfiles.nix

@@ -1,8 +0,0 @@
-with import <nixpkgs> {};
-fetchgit {
-  url = "https://github.com/glittershark/dotfiles.git";
-  rev = "e0c7f2592fbc2f9942763d2146d362a1314630e9";
-  # date = "2020-03-25T20:38:51-04:00";
-  sha256 = "126zy4ff6nl2vma2s74waksim7j5h3n6qpaxnnn17vkc1cq0fcd9";
-  fetchSubmodules = false;
-}

users/grfn/system/home/default.nix

@@ -5,13 +5,16 @@ with lib;
 rec {
   home = confPath: (import "${pkgs.home-manager.src}/modules" {
     inherit pkgs;
+
     configuration = { config, lib, ... }: {
-      imports = [confPath];
+      imports = [ confPath ];
-
-      _module.args.pkgs = mkForce
-        (import pkgs.path (filterAttrs (n: v: v != null) config.nixpkgs));
-
       lib.depot = depot;
+
+      # home-manager exposes no API to override the package set that
+      # is used, unless called from the NixOS module.
+      #
+      # To get around it, the module argument is overridden here.
+      _module.args.pkgs = mkForce pkgs;
     };
   });
 

users/grfn/system/home/machines/roswell.nix

@@ -37,9 +37,6 @@ in
     cachix
   ];
 
-
-  nixpkgs.config.allowUnfree = true;
-
   programs.password-store.enable = true;
 
   programs.home-manager.enable = true;

users/grfn/system/home/modules/common.nix

@@ -13,8 +13,6 @@
     ../modules/lib/cloneRepo.nix
   ];
 
-  nixpkgs.config.allowUnfree = true;
-
   programs.password-store.enable = true;
 
   grfn.impure.clonedRepos.passwordStore = {

users/grfn/system/home/modules/emacs.nix

@@ -43,13 +43,6 @@ in {
         gnutls
       ];
 
-      nixpkgs.overlays = [
-        (import (builtins.fetchTarball {
-          url = "https://github.com/nix-community/emacs-overlay/archive/54afb061bdd12c61bbfcc13bad98b7a3aab7d8d3.tar.gz";
-          sha256 = "0hrbg65d5h0cb0nky7a46md7vlvhajq1hf0328l2f7ln9hznqz6j";
-        }))
-      ];
-
       programs.emacs = {
         enable = true;
         package = pkgs.emacsUnstable;

users/grfn/system/home/modules/email.nix

@@ -37,10 +37,6 @@ in {
     msmtp
   ];
 
-  # nixpkgs.overlays = [(self: super: {
-  #   notifymuch = self.python3Packages.callPackage ../../pkgs/notifymuch.nix {};
-  # })];
-
   systemd.user.services = mapAttrs' (name: account: {
     name = escapeUnitName "lieer-${name}";
     value.Service = {

users/grfn/system/system/default.nix

@@ -21,12 +21,12 @@ rec {
       "${pkgs.home-manager.src}/nixos"
     ];
 
+    # Use the same nixpkgs as everything else
+    home-manager.useGlobalPkgs = true;
+
     home-manager.users.grfn = { config, lib, ... }: {
       imports = [ ../home/machines/roswell.nix ];
       lib.depot = depot;
-      _module.args.pkgs = lib.mkForce
-        (import pkgs.path
-          (lib.filterAttrs (n: v: v != null) config.nixpkgs));
     };
   })).system;
 

users/grfn/system/system/modules/common.nix

@@ -56,8 +56,6 @@ with lib;
     shell = pkgs.zsh;
   };
 
-  nixpkgs.config.allowUnfree = true;
-
   nix = {
     trustedUsers = [ "grfn" ];
     autoOptimiseStore = true;

users/grfn/system/system/modules/sound.nix

@@ -1,9 +1,9 @@
 { config, lib, pkgs, ... }:
+
 {
   # Enable sound.
   sound.enable = true;
   hardware.pulseaudio.enable = true;
-  nixpkgs.config.pulseaudio = true;
 
   environment.systemPackages = with pkgs; [
     pulseaudio-ctl