lib: init, add timeTravel

flake.nix

@@ -18,6 +18,7 @@
         ./modules/part.nix
         ./packages/part.nix
         ./jobs/part.nix
+        ./lib/part.nix
       ];
     };
 

lib/part.nix

@@ -0,0 +1,5 @@
+{
+  imports = [
+    ./time-travel.nix
+  ];
+}

lib/time-travel.nix

@@ -0,0 +1,18 @@
+{ config, lib, ... }:
+
+let
+  timeTravel = rev: builtins.getFlake "github:privatevoid-net/depot/${rev}";
+
+in
+
+{
+  _module.args = { inherit timeTravel; };
+  perSystem = { system, ... }: {
+    _module.args.timeTravel' = rev: let
+      flake = timeTravel rev;
+      flake' = config.perInput system flake;
+    in flake' // {
+      inputs = lib.mapAttrs (_: input: config.perInput system input) flake.inputs;
+    };
+  };
+}