#!/bin/bash
# 在设备上装 git，准备往 Gitee 推代码。
set -u

echo "===== 1. 环境 ====="
df -h / | tail -1 | sed 's/^/  /'
echo "  apt: $(command -v apt-get >/dev/null 2>&1 && echo 有 || echo 没有)"

echo
echo "===== 2. apt 源能不能用 ====="
echo -n "  到 deb.debian.org: "
timeout 10 bash -c 'exec 3<>/dev/tcp/deb.debian.org/80' 2>/dev/null \
    && echo "通" || echo "不通"
echo -n "  到 mirrors.aliyun.com: "
timeout 10 bash -c 'exec 3<>/dev/tcp/mirrors.aliyun.com/80' 2>/dev/null \
    && echo "通" || echo "不通"

echo
echo "===== 3. 装 git ====="
export DEBIAN_FRONTEND=noninteractive
# 先换成国内源（默认源在国内 4G 下常常超时）
if ! grep -q 'mirrors.aliyun.com' /etc/apt/sources.list 2>/dev/null; then
    echo "  换成阿里云源"
    cp /etc/apt/sources.list /etc/apt/sources.list.bak 2>/dev/null || true
    cat > /etc/apt/sources.list <<'EOF'
deb https://mirrors.aliyun.com/debian bookworm main contrib non-free
deb https://mirrors.aliyun.com/debian bookworm-updates main contrib non-free
deb https://mirrors.aliyun.com/debian-security bookworm-security main contrib non-free
EOF
fi

timeout 240 apt-get update -qq 2>&1 | tail -3 | sed 's/^/  /'
echo "  开始装…"
timeout 300 apt-get install -y -qq git 2>&1 | tail -5 | sed 's/^/  /'

echo
echo "===== 4. 结果 ====="
if command -v git >/dev/null 2>&1; then
    echo "  ✓ git $(git --version | awk '{print $3}')"
else
    echo "  ✗ 还是没装上"
fi