自动更新Hosts文件

刚开始想网上找一个OpenWRT系统上更新Hosts文件，但是发现要么就是简单粗暴直接下载要么只能下载单个文件再启动服务。
毕竟不是运维出身，于是花了一晚上功夫边学边写的，目前运行良好。

更新日志

• 20250101
  修复了文件获取失败导致无法继续执行的问题。

• 20240716
  修复了log输出时时间戳不准确的问题。

• 20240624
  修改wget方式，合并去重以及格式化。

• 20240601
  增加了下载是否成功并且行数大于0验证。

#!/bin/sh
s#!/bin/sh
set -e

# Hosts URL 列表
HOSTS_URL1="https://gitlab.com/ineo6/hosts/-/raw/master/next-hosts"
HOSTS_URL2="https://raw.hellogithub.com/hosts"
HOSTS_URL3="https://gh-proxy.com/raw.githubusercontent.com/maxiaof/github-hosts/master/hosts"

# 系统文件
UPDTLOG_FILE="/tmp/app_update.log"
TMPHOST_FILE=$(mktemp)
ETCHOST_FILE="/etc/hosts"

log_message() {
    echo "$(date "+%Y-%m-%d %H:%M:%S") $1" >> "$UPDTLOG_FILE"
}

download_hosts() {
    local url=$1
    local output
    output=$(/usr/bin/wget --timeout=10 --no-hsts -qO- "$url" 2>/dev/null)
    if [ $? -eq 0 ]; then
        echo "$output"
    else
        log_message "[Hosts Update]Failed to download from $url"
        return 1
    fi
}

{
    download_hosts "$HOSTS_URL1" || true
    download_hosts "$HOSTS_URL2" || true
    download_hosts "$HOSTS_URL3" || true
} | sed -e '/^[[:space:]]*$/d' -e '/^[0-9]/!d' \
  | sort -uk2 | awk '!seen[$0]++' \
  | awk '{printf "%-20s %s\n", $1, $2}' > "$TMPHOST_FILE"

LINE_COUNT=$(wc -l < "$TMPHOST_FILE")

if [ -s "$TMPHOST_FILE" ] && [ "$LINE_COUNT" -gt 0 ]; then
    cp "$TMPHOST_FILE" "$ETCHOST_FILE"

    if command -v systemctl >/dev/null 2>&1; then
        systemctl restart dnsmasq
    else
        /etc/init.d/dnsmasq restart
    fi

    log_message "[Hosts Update]Successfully downloaded Hosts File [Records:$LINE_COUNT]"
else
    log_message "[Hosts Update]Failed to download Hosts File [Records:$LINE_COUNT]"
    exit 1
fi

trap 'rm -f "$TMPHOST_FILE"' EXIT