fix check.nur (dont use builtin fetchers when stdenv ones are available)

pkgs/additional/nixpkgs-wayland/default.nix

@@ -1,5 +1,6 @@
 { pkgs
 , fetchFromGitHub
+, lib
 }:
 let
   src = fetchFromGitHub {
@@ -8,7 +9,17 @@ let
     rev = "8e2d180329f4009ac06042b50ca0a356722aea19";
     hash = "sha256-8rKI+MKmWOpEy7XKRMURph4b6VkMkh+Nr20hkpyk5hM=";
   };
-  overlay = import "${src}/overlay.nix";
+  flake = import "${src}/flake.nix";
+  evaluated = flake.outputs {
+    self = evaluated;
+    lib-aggregate.lib = lib // {
+      # mock out flake-utils, which it uses to construct flavored package sets.
+      # we only need the overlay (unflavored)
+      flake-utils.eachSystem = sys: fn: {};
+    };
+  };
+  overlay = evaluated.overlay;
+
   final = pkgs.appendOverlays [ overlay ];
 in src.overrideAttrs (base: {
   # passthru only nixpkgs-wayland's own packages -- not the whole nixpkgs-with-nixpkgs-wayland-as-overlay:

pkgs/additional/nixpkgs/default.nix

@@ -20,18 +20,24 @@
 , doPatch ? true
 , localSystem ? builtins.currentSystem  #< not available in pure mode
 , system ? localSystem
+, fetchzip ? builtins.fetchTarball
 }:
 let
-  unpatchedSrc = builtins.fetchGit {
-    url = "https://github.com/NixOS/nixpkgs.git";
-    ref = variant;
-    rev = {
-      master = "716a7056386dcc67eb3b813289499d6329d4befc";
-      staging = "da9d22446697971278edcd4af92f63221f7d21f6";
-      staging-next = "5aa86ae5585cd46299ee46682fda8a9b76baf2ae";
-    }."${variant}";
+  lock = {
+    master.rev = "716a7056386dcc67eb3b813289499d6329d4befc";
+    master.sha256 = "sha256:1skv9nbnspi3pphk4jzvcj147796m4wqdx8iwdbnl9h4nd3kw6n2";
+    staging.rev = "da9d22446697971278edcd4af92f63221f7d21f6";
+    staging.sha256 = "sha256:0yccyg071zn77i1pfb49dz07difwx5k3w1g0l1vdzlc3xiv9dgmk";
+    staging-next.rev = "5aa86ae5585cd46299ee46682fda8a9b76baf2ae";
+    staging-next.sha256 = "sha256:1dqws7fmdv4l9mk45i88ivzlxzm2b4lbdg9rg4am0z1alsz36dzz";
   };
-  unpatchedNixpkgs = import "${unpatchedSrc}" { inherit localSystem; };
+  unpatchedSrc = let
+    lock' = lock."${variant}";
+  in fetchzip {
+    url = "https://github.com/NixOS/nixpkgs/archive/${lock'.rev}.tar.gz";
+    inherit (lock') sha256;
+  };
+  unpatchedNixpkgs = import unpatchedSrc { inherit localSystem; };
 
   patchesFor = unpatchedNixpkgs.callPackage ./list.nix { };
 
@@ -45,7 +51,7 @@ let
     };
   };
 
-  src = if doPatch then patchedSrc else unpatchedSrc;
+  src = if doPatch then patchedSrc else { outPath = unpatchedSrc; };
   args = {
     inherit localSystem;
     config = {
@@ -60,4 +66,4 @@ let
 in
   # N.B.: this is crafted to allow `nixpkgs.FOO` from other nix code
   # AND `nix-build -A nixpkgs`
-  src // (import "${src}" args)
+  (import "${src}" args) // src

pkgs/default.nix

@@ -64,7 +64,7 @@ let
     modemmanager-split = callPackage ./additional/modemmanager-split { };
     mx-sanebot = callPackage ./additional/mx-sanebot { };
     networkmanager-split = callPackage ./additional/networkmanager-split { };
-    nixpkgs = import ./additional/nixpkgs {
+    nixpkgs = callPackage ./additional/nixpkgs {
       localSystem = stdenv.buildPlatform.system;
       system = stdenv.hostPlatform.system;
     };