chroot_version_hooks.d/88_clean_old_modules

# Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# When upgrading kernels, old modules might get left behind.
# Clean them out now that our builds pay attention to them.

update() {
  local root=$1 board=$2
  local dir="${root}/lib/modules"

  # Maybe the board hasn't had any kernel packages installed yet.
  if [[ ! -d ${dir} ]]; then
    return 0
  fi

  # Use qfile's orphans option to locate unowned files.
  ROOT=${root} \
  find "${dir}" -xdev -type f -exec \
    qfile -R -o {} + | xargs sudo rm -fv

  # Now trim any possibly empty dirs.
  find "${dir}" -xdev -depth -mindepth 1 -type d -exec rmdir {} + 2>/dev/null
}

for board_root in /build/*; do
  board=${board_root##*/}
  update ${board_root} ${board} &
done

wait