Whiteout directory not work.

[pigfall]

Reproduce steps:

• Download and prepare the layers fuse-layers.zip

  #!/bin/bash
  set -e
  mkdir -p /tmp/reproduce
  cd /tmp/reproduce
  curl -LO https://github.com/user-attachments/files/15951378/fuse-layers.zip
  unzip fuse-layers.zip
  cd fuse-layers
  mkdir -p merged
  fuse-overlayfs -o lowerdir="$(pwd)/l1:$(pwd)/l0" merged

• Reproduce the bug by access files in following sequence

  
  #!/bin/bash
  # Result is as expected.
  ls /tmp/reproduce/fuse-layers/merged/site-packages > /dev/null

Result is as expected.

ls /tmp/reproduce/fuse-layers/merged/site-packages/setuptools > /dev/null

Result is wrong. Beacuse there is whiteout file in l1/site-package/setuptools/.wh..wh.opq, so we should only see the file depends.cpython-38.pyc from l1. But result is config.cpython-38.pyc depends.cpython-38.pyc which are from l0

ls /tmp/reproduce/fuse-layers/merged/site-packages/setuptools/pycache

echo '' echo 'Result is wrong. Beacuse there is whiteout file in l1/site-package/setuptools/.wh..wh.opq, so we should only see the file depends.cpython-38.pyc from l1. But result is config.cpython-38.pyc depends.cpython-38.pyc which are from l0'