fix(lix/flakes): get a patch for flake-compat

kat/meta.nix

@@ -21,6 +21,31 @@ let
     unspecified
     ;
 
+  patched_lix = let
+    fetchTree-fix = pkgs.fetchurl {
+      url = "https://gerrit.lix.systems/changes/lix~2399/revisions/1/patch?download";
+      hash = "sha256-ecZOnpQmUYY2uSLwrt8QHkeLW+L5RZWVvi58h4GkGEY=";
+      name = "fetchTree-fix";
+      downloadToTemp = true;
+      postFetch = ''
+        base64 -d $downloadedFile > $out
+      '';
+    };
+  in pkgs.applyPatches {
+    src = sources.lix;
+    name = "lix";
+    patches = [
+      fetchTree-fix
+    ];
+  };
+
+  default_overlay_paths = [
+    "${sources.kat-pkgs}/overlay.nix"
+    (pkgs.writeText "lix-overlay.nix" ''
+      import "${sources.lix-overlay}/overlay.nix" { lix = ${patched_lix}; }
+    '')
+  ];
+
   machine_meta =
     { config, ... }:
     {
@@ -86,12 +111,7 @@ let
           ./nginx-fallback.patch
           ./ocamlPackagesExtentions.patch
         ] ++ config.patches;
-        overlay-paths = [
-          "${sources.kat-pkgs}/overlay.nix"
-          (pkgs.writeText "lix-overlay.nix" ''
-            import "${sources.lix-overlay}/overlay.nix" { lix = ${sources.lix}; }
-          '')
-        ] ++ config.overlay-paths;
+        overlay-paths = default_overlay_paths ++ config.overlay-paths;
         nixpkgs-paths = {
           nixpkgs-src = pkgs.applyPatches {
             src = sources."nixpkgs-${version}";
@@ -116,7 +136,14 @@ let
     };
 in
 {
-  options.machines = mkOption {
-    type = attrsOf (submodule machine_meta);
+  options = {
+    machines = mkOption {
+      type = attrsOf (submodule machine_meta);
+    };
+    general_overlays = mkOption {
+      type = listOf unspecified;
+      readOnly = true;
+    };
   };
+  config.general_overlays = map import default_overlay_paths;
 }

shell.nix

@@ -1,10 +1,8 @@
 let
   sources = import ./npins;
+  hive = import ./hive.nix;
   pkgs = import sources.nixpkgs-unstable {
-    overlays = [
-      (import "${sources.kat-pkgs}/overlay.nix")
-      (import "${sources.lix-overlay}/overlay.nix" { lix = "${sources.lix}"; })
-    ];
+    overlays = hive.meta.nodeSpecialArgs.kat-probook.meta.general_overlays;
   };
 in
 pkgs.mkShell {