From c01ea27ce356e1433da01a7b46ba40c880f2f2ac Mon Sep 17 00:00:00 2001
From: volth <volth@webmaster.ms>
Date: Thu, 25 Apr 2019 12:08:20 +0000
Subject: [PATCH] nixos-generate-config: do not build btrfs-tools when btrfs is
 not used

cross-compilation of `btrfs-tools` is broken, and this usually needless dependency of each system closure on `btrfs-tools` prevents cross-compilation of whole system closures
---
 nixos/modules/installer/tools/tools.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/installer/tools/tools.nix b/nixos/modules/installer/tools/tools.nix
index 00c4d5018bf5..59eb4a63af40 100644
--- a/nixos/modules/installer/tools/tools.nix
+++ b/nixos/modules/installer/tools/tools.nix
@@ -36,7 +36,7 @@ let
   nixos-generate-config = makeProg {
     name = "nixos-generate-config";
     src = ./nixos-generate-config.pl;
-    path = [ pkgs.btrfs-progs ];
+    path = lib.optionals (lib.elem "btrfs" config.boot.supportedFilesystems) [ pkgs.btrfs-progs ];
     perl = "${pkgs.perl}/bin/perl -I${pkgs.perlPackages.FileSlurp}/${pkgs.perl.libPrefix}";
     inherit (config.system.nixos) release;
   };