From 0450574818af22e3090f52d10e9bd76440ac428f Mon Sep 17 00:00:00 2001
From: Austin Horstman <khaneliman12@gmail.com>
Date: Thu, 4 Jun 2026 21:20:20 -0500
Subject: [PATCH] flake: gate development outputs to supported systems

Keep the home-manager package exposed for all nixpkgs flakeExposed systems, but only expose formatter, devShell, docs, tests, CI helpers, and legacy test packages on supported Home Manager systems.

This prevents nix flake check --all-systems from forcing unavailable formatter toolchains such as GHC on riscv64-linux and x86_64-freebsd.

Fixes #9389.
---
 flake.nix | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/flake.nix b/flake.nix
index 95a2af4c0..a11cd3af8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -45,9 +45,19 @@
     }
     // (
       let
-        forAllPkgs =
-          f:
-          nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (system: f nixpkgs.legacyPackages.${system});
+        supportedSystems = [
+          "aarch64-darwin"
+          "aarch64-linux"
+          "i686-linux"
+          "x86_64-darwin"
+          "x86_64-linux"
+        ];
+
+        forSystems = systems: f: nixpkgs.lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
+
+        forAllPkgs = forSystems nixpkgs.lib.systems.flakeExposed;
+
+        forSupportedPkgs = forSystems supportedSystems;
 
         forCI = nixpkgs.lib.genAttrs [
           "aarch64-darwin"
@@ -156,7 +166,7 @@
           lib.mapAttrs' renameTestPkg tests;
       in
       {
-        formatter = forAllPkgs (pkgs: pkgs.callPackage ./home-manager/formatter.nix { });
+        formatter = forSupportedPkgs (pkgs: pkgs.callPackage ./home-manager/formatter.nix { });
 
         # TODO: increase buildbot testing scope
         buildbot = forCI (
@@ -187,6 +197,8 @@
           {
             default = hmPkg;
             home-manager = hmPkg;
+          }
+          // nixpkgs.lib.optionalAttrs (nixpkgs.lib.elem pkgs.stdenv.hostPlatform.system supportedSystems) {
 
             ci-parse = pkgs.callPackage ./ci/parse.nix { nix = pkgs.nixVersions.latest; };
             ci-parse-lix = pkgs.callPackage ./ci/parse.nix {
@@ -212,11 +224,11 @@
           }
         );
 
-        devShells = forAllPkgs (pkgs: {
+        devShells = forSupportedPkgs (pkgs: {
           default = pkgs.callPackage ./home-manager/devShell.nix { };
         });
 
-        legacyPackages = forAllPkgs (
+        legacyPackages = forSupportedPkgs (
           pkgs:
           let
             inherit (pkgs.stdenv.hostPlatform) system;