# ❌ 避免使用完整版本
FROM ubuntu:latest

# ✅ 使用精简版本
FROM alpine:3.18
FROM python:3.11-slim
FROM node:18-alpine

# 构建阶段
FROM golang:1.21 AS builder
WORKDIR /app
COPY . .
RUN go build -o myapp

# 运行阶段 - 只复制必要文件
FROM alpine:3.18
WORKDIR /app
COPY --from=builder /app/myapp .
CMD ["./myapp"]

# ❌ 多层,体积大
RUN apt-get update
RUN apt-get install -y package1
RUN apt-get install -y package2

# ✅ 单层,并清理缓存
RUN apt-get update && \
    apt-get install -y package1 package2 && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

RUN apt-get update && \
    apt-get install -y build-essential && \
    # 构建操作... && \
    apt-get purge -y build-essential && \
    apt-get autoremove -y && \
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

# .dockerignore
node_modules
.git
*.md
.env
test/

# ❌ 复制所有内容
COPY . .

# ✅ 只复制需要的文件
COPY package.json package-lock.json ./
RUN npm ci --only=production
COPY src/ ./src/

RUN apk add --no-cache python3 && \
    rm -rf /usr/share/doc /usr/share/man

# 在单个 RUN 中完成所有操作
RUN set -ex && \
    apk add --no-cache --virtual .build-deps gcc musl-dev && \
    pip install --no-cache-dir -r requirements.txt && \
    apk del .build-deps

FROM ubuntu:20.04
RUN apt-get update
RUN apt-get install -y python3 python3-pip
COPY . /app
WORKDIR /app
RUN pip3 install -r requirements.txt
CMD ["python3", "app.py"]

FROM python:3.11-alpine AS builder
WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir --user -r requirements.txt

FROM python:3.11-alpine
WORKDIR /app
COPY --from=builder /root/.local /root/.local
COPY app.py .
ENV PATH=/root/.local/bin:$PATH
CMD ["python", "app.py"]