♻️ backwards compatibility for non-flake systems

shell.nix

@@ -1,19 +1,13 @@
-let
-  sources = import ./nix/sources.nix;
-  pkgs = import sources.nixpkgs {
-    overlays = [ (import ./overlays) ];
-    config = { };
-  };
-in
-pkgs.mkShell {
-  name = "athens";
-  buildInputs = [
-    pkgs.age
-    pkgs.morph
-    pkgs.sops
-  ];
-
-  shellHook = ''
-    export NIX_PATH="nixpkgs=${sources.nixpkgs}:home-manager=${sources.home-manager}:."
-  '';
-}
+(import
+  (
+    let
+      lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+    in
+    fetchTarball {
+      url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  {
+    src = ./.;
+  }).shellNix