# Copyright 2018 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.

# Rebuild host packages after libc++ migration.

REPOS=( $(portageq envvar PORTDIR) $(portageq envvar PORTDIR_OVERLAY) )

package_exists() {
  local pkg=$1
  for repo in "${REPOS[@]}"; do
    [[ -d "${repo}/${pkg}" ]] && return 0
  done
  return 1
}

# Find packages that use libstdc++ and remove their existing
# binary package.
PKGS=( $(qdepends -qCN -k NEEDED -Q 'libstdc\+\+\.so\.6') )
PKGDIR=$(portageq envvar PKGDIR)
PKGS_TO_REMOVE=()
cd "${PKGDIR}"
for pkg in "${PKGS[@]}"; do
  sudo rm -f "${pkg}-"[0-9]*.tbz2
  # Collect packages without ebuilds.
  if ! package_exists "${pkg}"; then
    PKGS_TO_REMOVE+=( "${pkg}" )
  fi
done

# Remove packages no longer present in tree.
if [[ ${#PKGS_TO_REMOVE[@]} -ne 0 ]]; then
  echo "Removing non-existent tree packages ${PKGS_TO_REMOVE[*]}"
  sudo qmerge -Uqy "${PKGS_TO_REMOVE[@]}"
fi

# New list that can be passed to portage.
# Ensure that llvm and clang are always pulled in.
PKGS=( sys-devel/llvm sys-devel/clang )
PKGS+=( $(qdepends -qCN -k NEEDED -Q 'libstdc\+\+\.so\.6') )

# Reinstall the packages using fresh binary packages.
sudo emerge --getbinpkg "${PKGS[@]}"