#!/usr/bin/env bash
set -e

echo "===> 检查系统信息..."
if [ -f /etc/os-release ]; then
  . /etc/os-release
else
  echo "找不到 /etc/os-release，无法判断系统类型，退出。"
  exit 1
fi

if [ "$ID" != "ubuntu" ]; then
  echo "当前不是 Ubuntu（ID=$ID），本脚本按 Ubuntu + apt + 阿里云源编写，请自行确认后改造。"
  exit 1
fi

CODENAME=$(lsb_release -cs 2>/dev/null || echo "$VERSION_CODENAME")
if [ -z "$CODENAME" ]; then
  echo "无法获取发行版代号（jammy/focal 等），退出。"
  exit 1
fi

echo "===> 备份原 sources.list 到 /etc/apt/sources.list.bak ..."
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

echo "===> 写入阿里云源 (Ubuntu $CODENAME) ..."
sudo bash -c "cat >/etc/apt/sources.list <<EOF2
deb http://mirrors.aliyun.com/ubuntu/ $CODENAME main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ $CODENAME-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ $CODENAME-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ $CODENAME-backports main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ $CODENAME main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ $CODENAME-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ $CODENAME-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ $CODENAME-backports main restricted universe multiverse
EOF2"

echo "===> apt 更新索引..."
sudo apt update

echo "===> 安装 subversion ..."
sudo apt install -y subversion

echo "===> 完成。当前 svn 版本："
svn --version | head -n 1 || echo "svn 命令未找到，请检查安装是否成功。"