From f1ddf462ce2fba8e671fb43939d322ee93a5fa1b Mon Sep 17 00:00:00 2001
From: phaer <hello@phaer.org>
Date: Fri, 23 May 2025 12:28:53 +0200
Subject: [PATCH] virtualisation/disk-image: fix image.extension

(cherry picked from commit b033e0c4b67084a9e3dae66b9de2e8b7d28edddd)
---
 nixos/modules/virtualisation/disk-image.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/virtualisation/disk-image.nix b/nixos/modules/virtualisation/disk-image.nix
index c524b6627113..40eea6b1237b 100644
--- a/nixos/modules/virtualisation/disk-image.nix
+++ b/nixos/modules/virtualisation/disk-image.nix
@@ -50,7 +50,7 @@ in
     };
 
     system.nixos.tags = [ cfg.format ] ++ lib.optionals cfg.efiSupport [ "efi" ];
-    image.extension = cfg.format;
+    image.extension = if cfg.format == "raw" then "img" else cfg.format;
     system.build.image = import ../../lib/make-disk-image.nix {
       inherit lib config pkgs;
       inherit (config.virtualisation) diskSize;