image: don't include osrel section in UKI

Author: msanft

flake.nix

@@ -20,6 +20,10 @@
       system:
       let
         overlay = final: prev: {
+          mkosi = prev.mkosi.overrideAttrs (old: {
+            patches = old.patches or [ ] ++ [ ./image/0001-drop-.osrel-UKI-section.patch ];
+          });
+
           rpm = prev.rpm.overrideAttrs (old: {
             nativeBuildInputs = old.nativeBuildInputs ++ [ prev.makeWrapper ];
             postFixup = ''
@@ -94,7 +98,8 @@
         # Note that it's *not* a legacy attribute.
         legacyPackages = {
           generate = pkgs.callPackage ./nix/generate.nix { };
-        } // pkgs;
+        }
+        // pkgs;
 
         packages.mkosi = mkosiDev;
 

image/0001-drop-.osrel-UKI-section.patch

@@ -0,0 +1,26 @@
+From d1f8df825632c244e4c087c7be83abe37d9ff9a6 Mon Sep 17 00:00:00 2001
+From: Moritz Sanft <[email protected]>
+Date: Fri, 29 Aug 2025 17:06:48 +0200
+Subject: [PATCH] drop .osrel UKI section
+
+Signed-off-by: Moritz Sanft <[email protected]>
+---
+ mkosi/__init__.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/mkosi/__init__.py b/mkosi/__init__.py
+index 65cac772..0266a595 100644
+--- a/mkosi/__init__.py
++++ b/mkosi/__init__.py
+@@ -1706,7 +1706,7 @@ def build_uki(
+     json_out = False
+ 
+     arguments: list[PathString] = [
+-        "--os-release", f"@{workdir(context.root / 'usr/lib/os-release')}",
++        # "--os-release", f"@{workdir(context.root / 'usr/lib/os-release')}",
+         "--uname", kver,
+         "--linux", workdir(kimg),
+         *flatten(["--join-profile", os.fspath(workdir(profile))] for profile in profiles),
+-- 
+2.51.0
+