From b5fab53628e8f080bae24ea1396f72d9d21e1f9b Mon Sep 17 00:00:00 2001
From: Luke Granger-Brown <git@lukegb.com>
Date: Sun, 1 Aug 2021 18:59:08 +0000
Subject: [PATCH] nixos/virtualbox-image: cast baseImageFreeSpace into str

This fixes an evaluation error that's blocking the nixos-unstable
channel (#132328).
---
 nixos/modules/virtualisation/virtualbox-image.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/virtualisation/virtualbox-image.nix b/nixos/modules/virtualisation/virtualbox-image.nix
index 853dd642a76..1a0c4df42cb 100644
--- a/nixos/modules/virtualisation/virtualbox-image.nix
+++ b/nixos/modules/virtualisation/virtualbox-image.nix
@@ -136,7 +136,7 @@ in {
       inherit pkgs lib config;
       partitionTableType = "legacy";
       diskSize = cfg.baseImageSize;
-      additionalSpace = cfg.baseImageFreeSpace;
+      additionalSpace = "${toString cfg.baseImageFreeSpace}M";
 
       postVM =
         ''