Fix empty config.json caused by buffered write

diff --git a/mkosi/__init__.py b/mkosi/__init__.py
index 992e268eb0926f41e7734be741c1ee98f60c9551..8a520d2f132426718db9499250298b1213b11b15 100644 (file)
--- a/mkosi/__init__.py
+++ b/mkosi/__init__.py
@@ -428,6 +428,7 @@ def finalize_chroot_scripts(context: Context) -> contextlib.AbstractContextManag
 def finalize_config_json(config: Config) -> Iterator[Path]:
     with tempfile.NamedTemporaryFile(mode="w") as f:
         f.write(config.to_json())
+        f.flush()
         yield Path(f.name)