Merge #161

161: Multi-arch support for hosts(nixosConfigurations) r=nrdxp a=Pacman99

fixes #72 

also related, #125 

This allows users to set `nixpkgs.system` to any architecture exported by the nixpkgs flake and nixpkgs.pkgs will be set to that system.

I also added `multiPkgs` as a special arg and made `nixpkgs.pkgs` a default. So if someone wanted to do crossSystem builds or anything else with pkgs, that is also an option(eg. mobile-nixos!!).

Co-authored-by: Pacman99 <pachum99@gmail.com>

flake.nix

@@ -36,18 +36,16 @@
 
       extern = import ./extern { inherit inputs; };
 
-      pkgs' = os.mkPkgs;
+      multiPkgs = os.mkPkgs;
 
-      outputs =
-        let
-          system = "x86_64-linux";
-          pkgs = pkgs'.${system};
-        in
-        {
+      outputs = {
         nixosConfigurations =
           import ./hosts (nixos.lib.recursiveUpdate inputs {
-              inherit pkgs system extern;
-              inherit (pkgs) lib;
+            inherit multiPkgs extern;
+            defaultSystem = "x86_64-linux";
+            lib = nixos.lib.extend (final: prev: {
+              dev = self.lib;
+            });
           });
 
         nixosModules =
@@ -57,27 +55,28 @@
         overlay = import ./pkgs;
         overlays = lib.pathsToImportedAttrs (lib.pathsIn ./overlays);
 
-          lib = import ./lib { inherit nixos pkgs self inputs; };
+        lib = import ./lib { inherit nixos self inputs; };
 
         templates.flk.path = ./.;
         templates.flk.description = "flk template";
         defaultTemplate = self.templates.flk;
 
         deploy.nodes = os.mkNodes deploy self.nixosConfigurations;
-
-          checks =
-            let
-              tests = import ./tests { inherit self pkgs; };
-              deployChecks = builtins.mapAttrs
-                (system: deployLib: deployLib.deployChecks self.deploy)
-                deploy.lib;
-            in
-            nixos.lib.recursiveUpdate tests deployChecks;
       };
 
       systemOutputs = utils.lib.eachDefaultSystem (system:
-        let pkgs = pkgs'.${system}; in
+        let pkgs = multiPkgs.${system}; in
         {
+          checks =
+            let
+              tests = nixos.lib.optionalAttrs (system == "x86_64-linux")
+                (import ./tests { inherit self pkgs; });
+              deployHosts = nixos.lib.filterAttrs
+                (n: _: self.nixosConfigurations.${n}.config.nixpkgs.system == system) self.deploy.nodes;
+              deployChecks = deploy.lib.${system}.deployChecks { nodes = deployHosts; };
+            in
+            nixos.lib.recursiveUpdate tests deployChecks;
+
           packages = utils.lib.flattenTreeSystem system
             (os.mkPackages { inherit pkgs; });
 

hosts/README.md

@@ -25,6 +25,10 @@ that you intend to use on your machine.
 Additionally, this is the perfect place to import anything you might need from
 the [nixos-hardware][nixos-hardware] repository.
 
+> ##### _Note:_
+> Set `nixpkgs.system` to the architecture of this host, default is "x86_64-linux". 
+> Keep in mind that not all packages are available for all architectures.
+
 ## Example
 
 hosts/librem.nix:

hosts/default.nix

@@ -3,9 +3,9 @@
 , lib
 , nixos
 , override
-, pkgs
+, multiPkgs
 , self
-, system
+, defaultSystem
 , ...
 }:
 let
@@ -27,7 +27,7 @@ let
           modules;
       };
 
-    global = {
+    global = { config, ... }: {
       home-manager.useGlobalPkgs = true;
       home-manager.useUserPackages = true;
 
@@ -39,7 +39,7 @@ let
         "home-manager=${home}"
       ];
 
-      nixpkgs = { inherit pkgs; };
+      nixpkgs.pkgs = lib.mkDefault multiPkgs.${config.nixpkgs.system};
 
       nix.registry = {
         devos.flake = self;
@@ -79,7 +79,8 @@ let
       };
     in
     dev.os.devosSystem {
-      inherit system specialArgs;
+      inherit specialArgs;
+      system = defaultSystem;
       modules = modules // { inherit local lib; };
     };
 

lib/default.nix

@@ -1,4 +1,4 @@
-args@{ nixos, pkgs, self, ... }:
+args@{ nixos, self, ... }:
 let inherit (nixos) lib; in
 lib.makeExtensible (final:
   let callLibs = file: import file

tests/default.nix

@@ -59,7 +59,6 @@ let
     nixosTesting.makeTest calledTest;
 in
 {
-  x86_64-linux = {
   profilesTest = mkTest {
     name = "profiles";
 
@@ -99,5 +98,5 @@ in
 
     touch $out
   '';
-  };
 }
+