Trying to structure this to be a flake input.

flake.nix

@@ -0,0 +1,38 @@
+{
+  description = "Metanix infra logic flake";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs { inherit system; };
+      data = import ./meta.nix;
+      metanix = import ./lib/metanix.nix { inherit data; lib = pkgs.lib; };
+    in
+    {
+      # You get a devShell so you can :repl in peace
+      devShells.${system}.default = pkgs.mkShell {
+        buildInputs = [ pkgs.nix pkgs.git ];
+      };
+
+      # Simple command to dump the system index to stdout
+      apps.${system}.print-index = {
+        type = "app";
+        program = pkgs.writeShellScript "print-index" ''
+          nix eval --impure --expr '
+            let
+              data = import ./meta.nix;
+              lib = import ${nixpkgs}/lib;
+              metanix = import ./lib/metanix.nix { inherit data lib; };
+            in
+              builtins.toJSON metanix.buildSystemIndex
+          '
+        '';
+      };
+
+      # Or expose it as a Nix eval-friendly output
+      packages.${system}.default = pkgs.writeText "system-index.json"
+        (builtins.toJSON metanix.buildSystemIndex);
+    };
+}