#!/bin/sh
U=$(cat /proc/cmdline | tr ' ' '\n' | grep '^preseed/url=' | cut -d= -f2-)
echo "URL=$U"
echo "== preseed 里的 apt/mirror 行 =="
wget -qO- "$U" | grep -niE 'use_mirror|apt-setup|tasksel/first|pkgsel/include'
echo "== 卡住那个框的 debconf 模板名 =="
awk '/^Name:/{n=$2} /Change mirror/{print n}' /var/lib/cdebconf/templates.dat 2>/dev/null | sort -u