#!/bin/bash
# Copyright (c) 2021 Huawei Device Co., Ltd.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

set -e

function readfile ()
{
    for file in $1/*
    do
        if [ -d "$file" ];then
	    readfile $file $2 $3
        elif [ "$file" -nt "$2" ]; then
            echo $file is update
            touch $3;
            return
        fi
    done
}    

echo $1 for check kernel dir
echo $2 for output image
echo $3 for timestamp
if [ -e "$2" ]; then
    readfile $1 $2 $3
    if [ "$3" -nt "$2" ]; then
        echo "need update $2"
        rm -rf $2;
    fi
fi