#!/bin/bash

# Copyright (c) 2014 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

DEFINE_string board "all" \
    "Clean only builds for the given board or all boards."
DEFINE_string output_root "${DEFAULT_BUILD_ROOT}/images" \
    "Directory containing image result directories."
DEFINE_boolean keep_latest ${FLAGS_TRUE} \
    "Do not delete the latest successful image."

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

shopt -s nullglob

if [[ ! -d "${FLAGS_output_root}" ]]; then
    die_notrace "Output directory not found: ${FLAGS_output_root}"
fi

if [[ "${FLAGS_board}" == all ]]; then
    board_paths=( "${FLAGS_output_root}"/* )
elif [[ -d "${FLAGS_output_root}/${FLAGS_board}" ]]; then
    board_paths=( "${FLAGS_output_root}/${FLAGS_board}" )
else
    die_notrace "Board directory not found: ${FLAGS_output_root}/${FLAGS_board}"
fi

before=$(df -k "${FLAGS_output_root}" | awk '$3 ~ /^[0-9]+$/ { print $3 }')
for board_path in "${board_paths[@]}"; do
    if [[ ! -d "${board_path}" ]]; then
        continue
    fi

    for image_path in "${board_path}"/*; do
        if [[ -h "${image_path}" || ! -d "${image_path}" ]]; then
            continue
        fi

        if [[ ${FLAGS_keep_latest} -eq ${FLAGS_TRUE} ]]; then
	    # keep anything that is or newer than the latest
	    if [[ "${board_path}/latest" -ef "${image_path}" || \
	          "${board_path}/latest/version.txt" -ot \
		      "${image_path}/version.txt" ]]; then
                continue
	    fi
        fi

        # best effort attempt to clean up old mounts
        safe_umount_tree "${image_path}"

        info "Deleting ${board_path##*/}/${image_path##*/}"
        sudo rm -rf "${image_path}"
    done

    # cleanup broken symlinks
    if [[ -h "${board_path}/latest" && ! -e "${board_path}/latest" ]]; then
        rm "${board_path}/latest"
    fi
done

after=$(df -k "${FLAGS_output_root}" | awk '$3 ~ /^[0-9]+$/ { print $3 }')
saved=$(( before - after ))
if [[ ${saved} -lt 1024 ]]; then
    info "Deleted ${saved} KB"
elif [[ ${saved} -lt 1048576 ]]; then
    saved_mb=$(bc <<<"scale=2; ${saved} / 1024")
    info "Deleted ${saved_mb} MB"
else
    saved_gb=$(bc <<<"scale=2; ${saved} / 1048576")
    info "Deleted ${saved_gb} GB"
fi