#!/bin/bash
# 分析哪些东西可以安全清理（只读，先不动手）
set -u

echo "════════ 1. MySQL / MariaDB 到底有没有在用 ════════"
for svc in mysql mariadb mysqld; do
    st=$(systemctl is-active $svc 2>/dev/null)
    en=$(systemctl is-enabled $svc 2>/dev/null)
    [ "$st" != "" ] || [ "$en" != "" ] && echo "  $svc: active=$st enabled=$en"
done
echo "  进程:"
pgrep -a -f 'mysqld|mariadb' | head -3 | sed 's/^/    /' || echo "    没有 mysqld 在跑"
echo "  数据目录大小:"
du -sh /var/lib/mysql 2>/dev/null | sed 's/^/    /'
echo "  有没有别的服务依赖它:"
grep -rl 'mysql\|mariadb' /etc/systemd/system/*.service 2>/dev/null | head -5 | sed 's/^/    /' || echo "    没有"

echo
echo "════════ 2. 这台机器上装了哪些非系统服务 ════════"
systemctl list-unit-files --state=enabled --no-pager 2>/dev/null \
    | grep -vE '^(systemd|dbus|getty|rsyslog|cron|ssh|networking|wpa|avahi|bluetooth|ModemManager|NetworkManager|udev|e2scrub|fstrim|logrotate|man-db|apt-daily|dpkg-db|ifupdown|user@|serial-getty|console-setup|keyboard-setup|hwclock|kmod|procps|rc-local|qemu|cloud-init)' \
    | head -25 | sed 's/^/  /'

echo
echo "════════ 3. 中转真正需要的服务 ════════"
for svc in lanremote-relay lanremote-nettune lanremote-tunnel lanremote-tunnel-h2 lanremote-watchdog; do
    printf "  %-26s enabled=%-10s active=%s\n" "$svc" \
        "$(systemctl is-enabled $svc 2>/dev/null || echo '-')" \
        "$(systemctl is-active $svc 2>/dev/null || echo '-')"
done

echo
echo "════════ 4. 可安全清理的项（估个大小）════════"
apt_cache=$(du -sm /var/cache/apt 2>/dev/null | awk '{print $1}')
apt_lists=$(du -sm /var/lib/apt/lists 2>/dev/null | awk '{print $1}')
logs=$(du -sm /var/log 2>/dev/null | awk '{print $1}')
journal=$(journalctl --disk-usage 2>/dev/null | grep -oE '[0-9.]+[MG]' | head -1)
echo "  apt 包缓存 /var/cache/apt      ${apt_cache:-0} MB   （apt clean 可清）"
echo "  apt 索引 /var/lib/apt/lists    ${apt_lists:-0} MB   （apt clean 可清，但下次 apt update 会重下）"
echo "  /var/log                       ${logs:-0} MB   （日志，可截断）"
echo "  journald                       ${journal:-0}    （可 vacuum 到 20M）"
echo "  /root 下我的调试脚本           $(du -sm /root 2>/dev/null | awk '{print $1}') MB 中的一部分"
echo "  MySQL 数据                     $(du -sm /var/lib/mysql 2>/dev/null | awk '{print $1}' || echo 0) MB   （若没在用可卸）"

echo
echo "════════ 5. 我遗留的调试脚本（/root 下的 .sh/.py）════════"
n=$(ls -1 /root/*.sh /root/*.py 2>/dev/null | wc -l)
sz=$(du -sc /root/*.sh /root/*.py 2>/dev/null | tail -1 | awk '{print $1}')
echo "  文件数: $n   合计: $((sz / 1024)) KB"
echo "  列表（前 25 个）:"
ls -1 /root/*.sh /root/*.py 2>/dev/null | head -25 | sed 's/^/    /'

echo
echo "════════ 6. 有没有 apt 残留 / 大而无用的包 ════════"
dpkg -l 2>/dev/null | awk '$1=="rc" {print "  残留配置: " $2}' | head -12
echo "  可以 autoremove 的:"
apt-get -s autoremove 2>/dev/null | grep -E '^Remv' | head -12 | sed 's/^/    /' || echo "    （需要 apt-get update 后才能算）"