inputs.nix: Use nixos channels instead of github for the nixos tarballs

This reduces the dependency on github somewhat.

1 files changed, 15 insertions, 13 deletions

diff --git a/inputs.nix b/inputs.nix
index c899f356..b874df3c 100644
--- a/inputs.nix
+++ b/inputs.nix
@@ -1,6 +1,5 @@
 let
-  nixpkgsVersion = "26.05";
-  nixos-stable = "nixos-${nixpkgsVersion}";
+  nixosVersion = "26.05";
 
   lanzabooteVersion = "v1.1.0";
 
@@ -10,27 +9,34 @@ let
     repo = "nixpkgs";
     inherit ref;
   };
+  w_tarball = url: {
+    type = "tarball";
+    inherit url;
+  };
+
+  nixos_stable = "https://channels.nixos.org/nixos-${nixosVersion}/nixexprs.tar.zst";
+  nixos_unstable = "https://channels.nixos.org/nixos-unstable/nixexprs.tar.zst";
 in {
   _unflake.dedupRules = [
     {
       when = w_nixpkgs "nixpkgs-unstable";
-      set = {ref = "nixos-unstable";};
+      set = w_tarball nixos_unstable;
     }
     {
       when = w_nixpkgs "nixos-unstable-small";
-      set = {ref = "nixos-unstable";};
+      set = w_tarball nixos_unstable;
     }
     {
       when = w_nixpkgs "nixos-25.05";
-      set = {ref = nixos-stable;};
+      set = w_tarball nixos_stable;
     }
     {
       when = w_nixpkgs "nixos-25.11";
-      set = {ref = nixos-stable;};
+      set = w_tarball nixos_stable;
     }
     {
       when = w_nixpkgs "nixos-26.05";
-      set = {ref = nixos-stable;};
+      set = w_tarball nixos_stable;
     }
 
     {
@@ -107,12 +113,8 @@ in {
   "nixos-generators" = {
     url = "github:nix-community/nixos-generators/master";
   };
-  "nixpkgs-stable" = {
-    url = "github:NixOS/nixpkgs/nixos-${nixpkgsVersion}";
-  };
-  "nixpkgs" = {
-    url = "github:NixOS/nixpkgs/nixos-unstable-small";
-  };
+  "nixpkgs-stable" = {url = "tarball+${nixos_stable}";};
+  "nixpkgs" = {url = "tarball+${nixos_unstable}";};
   "nixvim" = {
     url = "github:nix-community/nixvim/main";
   };