# Copyright (c) 2012 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.

# Previously distfiles were stored entirely in the chroot, forcing us
# to download it everytime.  This content is now stored externally, exposed
# to the chroot via mount binds.
#
# What we're doing here is moving any existing content from the old locations,
# into the new locations- which will already have a mount bind in place.
# If it *doesn't*, meaning parallel cros_sdk usage, we just wipe the content
# (user can redownload it after all).
#
# Once that's done, upgrade the chroot directory structure installing
# syms pointing back to the new location.

upgrade_path() {
  local src="/var/lib/portage/$1"
  local dest="/var/cache/distfiles/$2"
  if [ -L "$src" ]; then
    # Already upgraded- skip this one.
    return 0
  fi
  # Suppress failures.  User just has to download in that case.
  sudo find "$src"/ -maxdepth 1 -mindepth 1 -exec sudo mv -t "$dest/" {} + || :
  sudo rm -rf "$src"
  sudo ln -s ../../cache/distfiles/"$2" "$src"
}

upgrade_path distfiles host
upgrade_path distfiles-target target

exit 0