java - 使用 JGit 计算文件的提交次数

Question

我正在尝试使用 Java 按提交次数列出 git 存储库中存在的所有文件。为此，我使用 JGit 库。

String filename = "/a/b/c.java";
String localPath = localPath;
Repository localRepo = new FileRepository(localPath + "/.git");
Git git = new Git(localRepo);
ObjectId head = localRepo.resolve(Constants.HEAD);
Iterable<RevCommit> logs = git.log().add(head).addPath(filename).call();
for (RevCommit revCommit : logs) {
    count++;
}

但是，我得到的 count 始终为 0 。

当我使用存储库主目录中现有的文件时，我得到正确的答案:

String filename = "d.java";
String localPath = localPath;
Repository localRepo = new FileRepository(localPath + "/.git");
Git git = new Git(localRepo);
ObjectId head = localRepo.resolve(Constants.HEAD);
Iterable<RevCommit> logs = git.log().add(head).addPath(filename).call();
for (RevCommit revCommit : logs) {
    count++;
}

但是，即使我更改到包含 c.java 的目录，我仍然没有得到正确的答案:

String filename = "c.java";
String localPath = localPath;
Repository localRepo = new FileRepository(localPath + "/.git");
Git git = new Git(localRepo);
ObjectId head = localRepo.resolve(Constants.HEAD);
System.setProperty("user.dir", localPath + "a/b";
Iterable<RevCommit> logs = git.log().add(head).addPath(filename).call();
for (RevCommit revCommit : logs) {
    count++;
}

有人可以帮助我理解我做错了什么吗？

Answer 1

您的代码片段不显示提交是如何创建的/存储库处于哪种状态。不过，可以肯定的是:像上一个代码片段中那样设置系统属性 user.dir 是没有用的，它不会被 JGit 评估。

以下内容并不完全是答案，而是一个如何将 git log 限制为文件夹中特定文件的工作示例。使用最新版本的 JGit 运行代码会成功。

public class LogLearningTest {
  @Rule
  public TemporaryFolder tempFolder = new TemporaryFolder();

  private Git git;
  private File file;

  @Test
  public void testCountNumberOfCommitsOnFile() throws Exception {
    writeFile( "initial content" );
    commitAll( "Create file in folder" );
    commitAll( "Unrelated commit" );
    writeFile( "changed content" );
    commitAll( "Change file in folder" );
    git.commit().setMessage( "Other commit" ).call();

    Iterable<RevCommit> logs = git.log().addPath( "folder/file" ).call();
    int count = 0;
    for( RevCommit revCommit : logs ) {
      count++;
    }

    assertEquals( 2, count );
  }

  @Before
  public void setUp() throws GitAPIException {
    git = Git.init().setDirectory( tempFolder.getRoot() ).call();
    File folder = new File( git.getRepository().getWorkTree(), "folder" );
    folder.mkdir();
    file = new File( folder, "file" );
  }

  @After
  public void tearDown() {
    git.getRepository().close();
  }

  private void writeFile( String content ) throws IOException {
    FileOutputStream outputStream = new FileOutputStream( file );
    outputStream.write( content.getBytes( "UTF-8" ) );
    outputStream.close();
  }

  private void commitAll( String message ) throws GitAPIException {
    git.add().addFilepattern( "." ).call();
    git.commit().setMessage( message ).call();
  }

}