#!/bin/bash

# Copyright (c) 2016 The CoreOS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

SCRIPT_ROOT=$(dirname $(readlink -f "$0"))
. "${SCRIPT_ROOT}/common.sh" || exit 1

# Script must run inside the chroot
assert_inside_chroot

assert_not_root_user

# Developer-visible flags.
DEFINE_string board "${DEFAULT_BOARD}" \
  "The board to build packages for."

# include upload options
. "${BUILD_LIBRARY_DIR}/release_util.sh" || exit 1

# Parse flags
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"
switch_to_strict_mode

if [[ -z "${FLAGS_board}" ]]; then
  echo "Error: --board is required."
  exit 1
fi

# set BOARD and BOARD_ROOT
. "${BUILD_LIBRARY_DIR}/toolchain_util.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/board_options.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/test_image_content.sh" || exit 1

declare -A repo_paths
for repo_name in $(portageq-$BOARD get_repos "${BOARD_ROOT}"); do
    repo_paths[$repo_name]=$(portageq-$BOARD \
        get_repo_path "${BOARD_ROOT}" "$repo_name")
done

rebuild_atoms=()

# a crazy format I can eval inside the loop
list_format='cp="$cp";cpv="$cpv";repo="$repo"'
for pkg_info in $(equery-$BOARD list --format="${list_format}" '*'); do
    eval "$pkg_info"
    pvr="${cpv#*/}"
    pkg_ebuild="${BOARD_ROOT}/var/db/pkg/${cpv}/${pvr}.ebuild"
    repo_ebuild="${repo_paths[$repo]}/${cp}/${pvr}.ebuild"

    if [[ ! -f "${pkg_ebuild}" ]]; then
        die "${pvr} installed but ${pkg_ebuild} is missing!!!"
    fi

    if [[ ! -f "${repo_ebuild}" ]]; then
        error "${pvr} is installed but ${repo_ebuild} is missing."
        error "Perhaps run build_packages --board=$BOARD"
        exit 1
    fi

    if cmp -s "${pkg_ebuild}" "${repo_ebuild}"; then
        continue
    fi

    info "${pvr}.ebuild has changed"
    rebuild_atoms+=( "=${cpv}" )
done

if [[ "${#rebuild_atoms[@]}" -eq 0 ]]; then
    info "No ebuild changes detected"
else
    info "Rebuilding ${#rebuild_atoms[@]} packages..."
    emerge-$BOARD --verbose "--jobs=${NUM_JOBS}" "${rebuild_atoms[@]}"

    info "Checking build root"
    test_image_content "${BOARD_ROOT}"
fi

command_completed