.NET Core下操作Git，自动提交代码到 GitHub

.net core 3.0 预览版发布已经好些时日了，博客园也已将其用于生产环境中，可见 .net core 日趋成熟

回归正题，你想盖大楼吗？想 github 首页一片绿吗？今天拿她玩玩自动提交代码至 github。

安装项目模板

dotnet new --install "microsoft.dotnet.web.projecttemplates.3.0"
dotnet new worker

创建项目

直接使用 .net cli 创建一个 work service 的项目

dotnet new worker -o automaticpush

用 visual studio 2019 打开项目可以看到以下代码

// program.cs
public class program
{
    public static void main(string[] args)
    {
        createhostbuilder(args).build().run();
    }

    public static ihostbuilder createhostbuilder(string[] args) =>
        host.createdefaultbuilder(args)
            .configureservices((hostcontext, services) =>
            {
                services.addhostedservice<worker>();
            });
}

• 从 3.0 起 webhost 被 host 取代了
• createhostbuilder创建 host 并在configureservices中调用.addhostedservice<worker>()

// worker.cs
public class worker : backgroundservice
{
    private readonly ilogger<worker> _logger;
    public worker(ilogger<worker> logger)
    {
        _logger = logger;
    }

    protected override async task executeasync(cancellationtoken stoppingtoken)
    {
        while (!stoppingtoken.iscancellationrequested)
        {
            _logger.loginformation("worker running at: {time}", datetimeoffset.now);
            await task.delay(1000, stoppingtoken);
        }
    }
}

worker 继承了 backgroundservice，在 override executeasync 方法中完成自动提交的代码

.net 下操作 git 需要用到一个库 libgit2sharp，同时支持 .net framework 及 .net core

在项目中安装使用

install-package libgit2sharp

libgit2sharp 简单使用

• repository.init(@"d:\work") 在指定路径创建一个新的 git 仓库，相当于 git init

• repository.clone("https://github.com/meowv/blog.git", @"d:\work") 拉取一个远程仓库到本地，相当于 git clone

• using (var repo = new repository(@"d:\blog")){} 打开本地存在的 git 仓库

• 获取 branch

  using (var repo = new repository(@"d:\blog"))
  {
      var branches = repo.branches;
  
      foreach (var item in branches)
      {
      }
  }

• 获取 commits

  using (var repo = new repository(@"d:\blog"))
  {
      foreach (var commit in repo.commits)
      {
      }
  }

• 获取 tags

  using (var repo = new repository(@"d:\blog"))
  {
      foreach (var commit in repo.tags)
      {
      }
  }

• 更多操作请移步 https://github.com/libgit2/libgit2sharp

自动 push 代码盖大楼

有了以上基础，就可以实现自动生成文件，push 代码到 github 了。

新建一个配置文件，存放我们 github 仓库以及账号密码等重要信息

{
  "repository": "本地git仓库绝对路径",
  "username": "github账号",
  "password": "github密码",
  "name": "提交人",
  "email": "邮箱"
}

在executeasync中读取配置文件信息

var configurationroot = new configurationbuilder().addjsonfile("config.json").build();

var path = configurationroot["repository"];
var username = configurationroot["username"];
var password = configurationroot["password"];
var name = configurationroot["name"];
var email = configurationroot["email"];

git会自动检测文件变化，所以就先自动按日期创建.log文件，不断生成内容然后提交

while (!stoppingtoken.iscancellationrequested)
{
    var filename = $"{datetime.now.tostring("dd")}.log";
    var content = datetime.now.tostring("yyyy-mm-dd hh:mm:ss");

    // 写入内容
    writetext(path, filename, content);

    using (var repo = new repository(path))
    {
        // stage the file
        commands.stage(repo, "*");
        // create the committer's signature and commit
        var author = new signature(name, email, datetime.now);
        var committer = author;
        // commit to the repository
        var commit = repo.commit(content, author, committer);
        // git push
        var options = new pushoptions
        {
            credentialsprovider = new credentialshandler((url, usernamefromurl, types) =>
            {
                return new usernamepasswordcredentials()
                {
                    username = username,
                    password = password
                };
            })
        };
        repo.network.push(repo.branches["master"], options);
    }

    console.writeline(content);

    // 等待60秒继续执行...
    await task.delay(60000, stoppingtoken);
}

private static void writetext(string path, string filename, string content)
{
    path = path.combine(path, datetime.now.tostring(@"yyyy\\mm"));
    if (!directory.exists(path))
    {
        directory.createdirectory(path);
    }
    var filepath = path.combine(path, filename);
    using var fs = new filestream(filepath, filemode.append);
    using var sw = new streamwriter(fs);
    sw.writeline(content);
}

至此，整个代码编写部分结束，项目发布后可以选择sc.exe注册为windows服务，在这里推荐使用nssm(一个服务封装程序)，好了，赶紧盖大楼去吧~~