snowfall migration wip homepc done

templates/overlay/default.nix

@@ -1,3 +1,15 @@
-channels: (final: prev: {
-  package = prev.package.override {};
-})
+{
+  # Channels are named after NixPkgs instances in your flake inputs. For example,
+  # with the input `nixpkgs` there will be a channel available at `channels.nixpkgs`.
+  # These channels are system-specific instances of NixPkgs that can be used to quickly
+  # pull packages into your overlay.
+  channels,
+  namespace,
+  inputs,
+  ...
+}: final: prev: {
+  # For example, to pull a package from unstable NixPkgs
+  inherit (channels.unstable) chromium;
+
+  my-package = inputs.my-input.packages.${prev.system}.my-package;
+}