config-manager: Move installation of nh to module

And add `system` option that is required to pick the correct package
from `nh`

README.md

@@ -1,8 +1,12 @@
 # `config-manager`
 `./config-manager` is a module that contains a script to make usage of this flake easier.
 
-To install it first add the module to the nixOS system connfiguration and then 
-run `nixos-rebuild switch --flake .#<configuration>`, after that `cm` will be available on `$PATH`.
+To install it 
+1. first add the module to the nixOS system connfiguration
+2. set `config-manager.flakePath = <path to this flake>`
+3. set `config-manager.system = <system type for the machine>`
+4. run `nixos-rebuild switch --flake .#<configuration>`
+after that `cm` will be available on `$PATH`.
 
 # Secrets
 Secrets are managed by `agenix` (https://github.com/ryantm/agenix).

config-manager/default.nix

@@ -1,11 +1,18 @@
-{  pkgs, lib, config, ... }:
+{ inputs, pkgs, lib, config, ... }:
 let
-  config-manager = let
   flakePath = config.config-manager.flakePath;
   nixosConfiguration = config.config-manager.nixosConfiguration;
-  in
+  system = config.config-manager.system;
+
+  nh = inputs.nh.packages."${system}".default;
+
+  config-manager =
     if flakePath == "" then
       throw "'config-manager.flakePath' cannot be empty"
+    else if nixosConfiguration == "" then
+      throw "'config-manager.nixosConfiguration' cannot be empty"
+    else if system == "" then
+      throw "'config-manager.system' cannot be empty"
     else
       pkgs.writeShellScriptBin "cm" ''
         help() {
@@ -25,7 +32,7 @@ EOF
         }
 
         switch() {
-          nh os switch --hostname ${nixosConfiguration} ${flakePath}
+          ${nh}/bin/nh os switch --hostname ${nixosConfiguration} ${flakePath}
         }
 
         case $1 in
@@ -52,10 +59,19 @@ in
         default = config.networking.hostName;
         description = "what nixosConfiguration to use";
       };
+
+      system = lib.mkOption {
+        type = lib.types.str;
+        default = "";
+        description = "what system the host is (x86_64-linux, aarch64-linux)";
+      };
     };
   };
 
   config = {
-    environment.systemPackages = [ config-manager ];
+    environment.systemPackages = [
+      nh
+      config-manager
+    ];
   };
 }

flake.nix

@@ -51,6 +51,7 @@
 
       sombrero = inputs.nixpkgs2211.lib.nixosSystem {
         system = "aarch64-linux";
+        specialArgs = { inherit inputs; };
         modules = [
           ./hosts/sombrero/configuration.nix
           inputs.home-manager.nixosModules.home-manager

hosts/pinwheel/configuration.nix

@@ -66,13 +66,15 @@
 
   environment.systemPackages = with pkgs; [
     inputs.agenix.packages."${system}".default
-    inputs.nh.packages."${system}".default
     coreutils
     gnumake
     bash
   ];
 
-  config-manager.flakePath = "/home/alex/config";
+  config-manager = {
+    flakePath = "/home/alex/config";
+    system=system;
+  };
 
   mod = {
     nix-index.enable = true;

hosts/sombrero/configuration.nix

@@ -370,7 +370,10 @@
     restic
   ];
 
-  config-manager.flakePath = "/home/alex/config";
+  config-manager = {
+    flakePath = "/home/alex/config";
+    system = "aarch64-linux";
+  };
 
   # Copy the NixOS configuration file and link it from the resulting system
   # (/run/current-system/configuration.nix). This is useful in case you