From c2219a58525f02be455480bbd63c14455345c352 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Tue, 12 Apr 2022 14:46:33 +0200
Subject: flake: allow cross compilation of tarballs

---
 flake.nix | 45 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 34 insertions(+), 11 deletions(-)

diff --git a/flake.nix b/flake.nix
index 850c6c9..739ba9e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,23 +14,45 @@
         nixpkgs.overlays = [ self.overlay ];
       };
 
-      lib = {
-        # The full NixOS system
-        nixturrisSystem = {nixpkgs ? nixpkgs-stable, board, modules ? [], override ? {}}: let
-          pkgs = if board == "omnia"
-            then nixpkgs.legacyPackages.armv7l-linux
-            else nixpkgs.legacyPackages.aarch64-linux;
-        in nixpkgs.lib.nixosSystem ({
-          system = pkgs.system;
+      lib = rec {
+        # Mapping of board name to the appropriate system
+        boardSystem = {
+          omnia = {
+            config = "armv7l-unknown-linux-gnueabihf";
+            system = "armv7l-linux";
+          };
+          mox = {
+            config = "aarch64-unknown-linux-gnu";
+            system = "aarch64-linux";
+          };
+        };
+
+        # NixOS system for specific Turris board
+        nixturrisSystem = {
+          board,
+          system ? boardSystem.${board}.system,
+          nixpkgs ? nixpkgs-stable,
+          modules ? [],
+          override ? {}
+        }: nixpkgs.lib.nixosSystem ({
+          system = system;
           modules = [
             self.nixosModule
-            { turris.board = board; }
+            ({
+              turris.board = board;
+            } // nixpkgs.lib.optionalAttrs (system != boardSystem.${board}.system) {
+              nixpkgs.crossSystem = boardSystem.${board};
+            })
           ] ++ modules;
         } // override);
+
         # The minimalized system to decrease amount of ram needed for rebuild
         # TODO this does not work right now as it requires just load of work to do
-        nixturrisMinSystem = {nixpkgs ? nixpkgs-stable, modules, ...} @args: 
-        self.lib.nixturrisSystem (args // {
+        nixturrisMinSystem = {
+          nixpkgs ? nixpkgs-stable,
+          modules,
+          ...
+        } @args: self.lib.nixturrisSystem (args // {
           nixpkgs = nixpkgs;
           modules = modules ++ [ ./nixos/nixos-modules-minfake.nix ];
           override = {
@@ -44,6 +66,7 @@
         packages = let
 
           createTarball = board: (self.lib.nixturrisSystem {
+              system = system;
               board = board;
               modules = [ (import ./tarball.nix board) ];
             }).config.system.build.tarball;
-- 
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