如何使用libgit2连接到GitHub存储库？

Question

我正在尝试连接到一个回购:

using(var Git = new Repository(
    Repository.Clone("https://github.com/wikimedia/mediawiki-core", "tmp")
)){
    foreach(var Commit in Git.Commits)
    {
        MessageBox.Show(Commit.Author.Name);
    }
}

它连接正常(如果我更改了URL,我得到了预期的异常),但没有显示MessageBoxes - 为什么？这应该很简单.

Answer 1

关于您的问题,您需要考虑以下几点:

• 一个人无法"连接"到远程存储库并通过git协议动态检索一个文件.通常,期望检索本地副本(通过Repository.Clone())然后执行针对本地存储库的一些工作.
• Mediawiki-core是一个非常庞大的存储库.它包含超过10000次提交.因此,克隆可能需要相当长的时间.通过为Clone()方法提供传输进度处理程序,可以获得有关克隆进度的一些见解.
• @CarlosMartínNieto是对的.如果您只需要一个文件(而不是存储库的整个历史记录),那么依赖GitHub API确实会更有效率.请注意,此API的使用受您可能需要考虑的某些速率限制的约束,具体取决于预见的用法.

下面的代码(极大地受到您自己的代码的启发)克隆了一个远程存储库,将当前克隆进程输出到控制台,并枚举了可从中获取的提交HEAD.

它已成功通过LibGit2Sharp v0.14.1 NuGet包进行测试.

public void CloneAndEnumerateCommitsFromHead()
{
    var tmp = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());

    string path = Repository.Clone(
        "https://github.com/nulltoken/TestGitRepository", 
        tmp,
        onTransferProgress: ProgressHandler);

    using (var Git = new Repository(path))
    {
        foreach (var Commit in Git.Commits)
        {
            Console.WriteLine("{0} by {1}",
                Commit.Id.ToString(7),
                Commit.Author.Name);
        }
    }
}

private int ProgressHandler(TransferProgress progress)
{
    Console.WriteLine("{0}/{1}", progress.IndexedObjects, progress.TotalObjects);
    return 0;
}

运行时,输出以下内容

0/70
1/70
2/70
2/70
...snipped for brevity...
68/70
69/70
70/70
70/70
49322bb by A U Thor
d0114ab by A U Thor
f73b956 by A U Thor
6e14752 by A U Thor
1203b03 by A U Thor
bab66b4 by A U Thor
83834a7 by A U Thor
6462e7d by A U Thor
42e4e7c by A U Thor
7f82283 by A U Thor
59706a1 by A U Thor
c070ad8 by A U Thor
d31f5a6 by A U Thor
83d2f04 by A U Thor
6db9c2e by A U Thor
d86a2aa by A U Thor
0966a43 by A U Thor
2c34933 by A U Thor
ac7e7e4 by A U Thor
58be465 by A U Thor
6c8b137 by A U Thor