delegate pin management to tack

flake.nix

@@ -1,20 +1,22 @@
 {
-  inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-    nix-systems.url = "github:nix-systems/default-linux";
-    unf.url = "git+https://git.atagen.co/atagen/unf";
-  };
 
   outputs =
-    inputs:
-    with inputs;
+    { self, ... }@args:
     let
+      inputs = import ./.tack { overrides = args.tackOverrides or { }; };
+      inherit (inputs)
+        nixpkgs
+        nix-systems
+        tack
+        unf
+        ;
       version = builtins.toString self.lastModified;
       forEachSystem =
         function:
         nixpkgs.lib.genAttrs (import nix-systems) (
           system: function nixpkgs.legacyPackages.${system} system
         );
+      tackFor = system: tack.packages.${system}.default;
     in
     {
       devShells = forEachSystem (
@@ -28,9 +30,10 @@
       );
 
       packages = forEachSystem (
-        pkgs: _: {
+        pkgs: system: {
           default = pkgs.callPackage ./nix/default.nix {
             inherit version;
+            tack = tackFor system;
           };
           docs = pkgs.callPackage unf.lib.pak-chooie {
             inherit self;
@@ -55,9 +58,11 @@
         in
         {
           imports = [ ./nix/module.nix ];
+          programs.meat.tack = lib.mkDefault (tackFor pkgs.stdenv.hostPlatform.system);
           programs.meat.package = self.packages.${pkgs.stdenv.hostPlatform.system}.default.override {
             differ = cfg.differ;
             monitor = cfg.monitor;
+            tack = cfg.tack;
           };
         };