Only call become_root() if we need a full uid map

If we only need to map the current user to root, bubblewrap will do
that for us and we don't need to call become_root() after forking.

diff --git a/mkosi/qemu.py b/mkosi/qemu.py
index 2653c496c65c725a3e6cfc52af8784b420edc399..95130e3a0d6daf164b31852cbed381ec0f71e916 100644 (file)
--- a/mkosi/qemu.py
+++ b/mkosi/qemu.py
@@ -368,7 +368,7 @@ def start_virtiofsd(config: Config, directory: PathString, *, name: str, selinux
             # capabilities itself, we don't bother figuring out the exact set of capabilities it needs.
             user=uid if not scope else None,
             group=gid if not scope else None,
-            preexec_fn=become_root if not scope else None,
+            preexec_fn=become_root if not scope and not uidmap else None,
             env=scope_env() if scope else {},
             sandbox=config.sandbox(
                 binary=virtiofsd,