#!/bin/bash
set -e
LANG=en.US

#!/bin/bash

#检测网络链接畅通
function network()
{
    #超时时间
    local timeout=1

    #目标网站
    local target=www.baidu.com

    #获取响应状态码
    local ret_code=`curl -I -s --connect-timeout ${timeout} ${target} -w %{http_code} | tail -n1`

    if [ "x$ret_code" = "x200" ]; then
        #网络畅通
        return 0
    else
        #网络不畅通
        return 1
    fi

    return 0
}

network
if [ $? -eq 1 ];then
	echo "Network fail. Stop to avoid bother dpkg"
	exit -1
fi

#The code above is modified from https://blog.csdn.net/yaxuan88521/article/details/120516298


updatetext=`sudo apt update -o Dir::Etc::sourcelist="sources.list.d/sparkstore.list"     -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"`
isupdate=`echo $updatetext | grep "can be upgraded"`
#echo $isupdate

if [  "$isupdate" ];then
	update_app_number=`echo ${updatetext%package*} #从右向左截取第一个 src 后的字符串`
	update_app_number=`echo ${update_app_number: -1}`
	mkdir -p /tmp/spark-store-updatenum
	sudo echo "$update_app_number" > /tmp/spark-store-updatenum/number
fi