remove 21.05 compat

flake.nix

@@ -4,15 +4,7 @@
 
   outputs = { self, nixpkgs, impermanence, ... }:
     let
-
       mypkgs = import ./pkgs;
-
-      # polyfill. 21.05 doesn't have `systems.supported`
-      supportedSystems =
-        if builtins.elem "supported" (builtins.attrNames nixpkgs.lib.systems)
-        then (with nixpkgs.lib.systems.supported; tier1 ++ tier2)
-        else [ "x86_64-linux" ];
-
     in
     {
       nixosModules =
@@ -40,7 +32,7 @@
         morphHosts = import lib/morph.nix;
         forAllSystems = f: builtins.listToAttrs (map
           (name: { inherit name; value = f name; })
-          (supportedSystems));
+          (with nixpkgs.lib.systems.supported; tier1 ++ tier2));
       };
 
       packages = self.lib.forAllSystems

modules/profiles/desktop.nix

@@ -39,11 +39,10 @@ with lib;
       (vscode-with-extensions.override {
         vscode = vscodium;
         vscodeExtensions = with pkgs.vscode-extensions; [
-          # package was renamed from "Nix" to "nix" between 21.05 and 21.11
-          (if (builtins.elem "nix" (builtins.attrNames bbenoist)) then bbenoist.nix else bbenoist.Nix)
+          bbenoist.nix
+          ms-azuretools.vscode-docker
           ms-python.python
           ms-vscode.cpptools
-          ms-azuretools.vscode-docker
         ];
       })