{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "name": "g++-9 - Build and debug active file",
      "type": "cppdbg",
      "request": "launch",
      "program": "./build/test/${fileBasenameNoExtension}",
      "args": [],
      "stopAtEntry": false,
      "sourceFileMap":{
        "/bustub": "${workspaceFolder}"
        /*remote src directory : local src directory*/
        /*文檔里說這個是為了便于debugger找源碼*/
      },
      "cwd": "/bustub",
      "environment": [],
      "pipeTransport": {
        "pipeCwd": "/usr/bin",
        "pipeProgram": "ssh",
        "pipeArgs": [
          "root@172.17.0.2"
        ],
        "debuggerPath": "/usr/bin/gdb"
      },
      "externalConsole": false,
      "MIMode": "gdb",
      "setupCommands": [
        {
          "description": "Enable pretty-printing for gdb",
          "text": "-enable-pretty-printing",
          "ignoreFailures": true
        }
      ],
      "preLaunchTask": "C/C++: g++-9 build active file",
      "miDebuggerPath": "/usr/bin/gdb"
    }
  ]
}

{
  "tasks": [
    {
      "type": "shell",
      "label": "C/C++: g++-9 build active file",
      "command": "ssh",
      "args": [
        "root@172.17.0.2",
        "cd /bustub/build && make ${fileBasenameNoExtension}"
      ],
      "group": {
        "kind": "build",
        "isDefault": true
      },
      "detail": "Task generated by Debugger."
    }
  ],
  "version": "2.0.0"
}

編譯時利用ssh，在docker的終端中進行編譯。而在launch.json中利用ssh作為pipeProgram，傳遞調試信息（雖然原理我也不太懂就是了）。172.17.0.2是container的IP地址。

為了保證主機能夠直接通過ssh登錄container，需要修改一下dockerfile文件。最終我的dockerfile文件長這樣：

FROM ubuntu:18.04

# Install Ubuntu packages.
# Please add packages in alphabetical order.
ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get -y update && \
    apt-get -y install \
      build-essential \
      clang-8 \
      clang-format-8 \
      clang-tidy-8 \
      cmake \
      doxygen \
      git \
      g++-7 \
      pkg-config \
      valgrind \
      zlib1g-dev \
	  ssh
RUN echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config && \
    echo 'PermitEmptyPasswords yes' >> /etc/ssh/sshd_config && \
    echo 'PasswordAuthentication yes' >> /etc/ssh/sshd_config && \
	echo 'PubkeyAuthentication yes' >> /etc/ssh/sshd_config && \
	mkdir /root/.ssh

COPY ./id_rsa.pub /root/.ssh/authorized_keys

CMD service ssh start && git config --global http.proxy "http://192.168.31.1:7890" && bash

修改的地方主要是安裝ssh，然后把本地公鑰copy過去，注意copy命令只能copy當前context下的文件，所以需要先復制一份公鑰到源碼目錄中。然后CMD中顯式啟動ssh service。并且配置git代理（不然有時候clone github會失?。?/p>

docker啟動該鏡像的時候就不要顯式指定命令了，不然這樣會覆蓋默認的CMD指令。

最后還需要改一下.dockerignore文件，原來的.dockerignore文件會忽略源碼目錄下所有文件，導致COPY命令出錯。OK，這樣就可以愉快地在本地vscode下面調試container里面的程序了。