Specific nixpkgs per host

flake.lock

@@ -36,10 +36,27 @@
         "type": "github"
       }
     },
+    "nixpkgs-schule": {
+      "locked": {
+        "lastModified": 1679437018,
+        "narHash": "sha256-vOuiDPLHSEo/7NkiWtxpHpHgoXoNmrm+wkXZ6a072Fc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "19cf008bb18e47b6e3b4e16e32a9a4bdd4b45f7e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "nixos-exporter": "nixos-exporter",
         "nixpkgs": "nixpkgs",
+        "nixpkgs-schule": "nixpkgs-schule",
         "solid-xmpp-alarm": "solid-xmpp-alarm"
       }
     },

flake.nix

@@ -1,6 +1,7 @@
 {
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixpkgs-schule.url = "github:NixOS/nixpkgs/nixos-unstable";
     nixos-exporter = {
       url = "git+https://git.clerie.de/clerie/nixos-exporter.git";
       inputs.nixpkgs.follows = "nixpkgs";

lib/flake-helper.nix

@@ -1,7 +1,9 @@
 { self, nixpkgs, nixos-exporter, solid-xmpp-alarm, ... }@inputs:
 
 rec {
-  generateNixosSystem = name: nixpkgs.lib.nixosSystem {
+  generateNixosSystem = name: let
+    localNixpkgs = nixpkgs.lib.attrByPath [ "nixpkgs-${name}" ] nixpkgs inputs;
+  in localNixpkgs.lib.nixosSystem {
     system = "x86_64-linux";
     modules = [
       ({ ... }: {