如何使用JGIT恢复到修订版

Question

我无法恢复到特定的修订版。以下是我正在运行的代码。

运行此代码后，我希望在文件中只看到“第1行”和“第2行”。但是，当我打开它时，总共有3行。我期望得到一个新的修订版本，包括提交2中的内容。

import java.io.File;
import java.util.Iterator;
import org.apache.commons.io.FileUtils;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.RevertCommand;
import org.eclipse.jgit.revwalk.RevCommit;

public class JGit1 {

    public static void main(String[] args) {
        try {
            // create a clean repository
            File path = new File("c:/temp/agit/gitrepo");
            if (path.exists()) {
                FileUtils.deleteDirectory(path);
            }
            Git git = Git.init().setDirectory(path).call();
            System.out.println("Created a new repository at " + git.getRepository().getDirectory());

            // Create a new file and add it to the index
            File newFile = new File(path, "file1.txt");
            FileUtils.writeStringToFile(newFile, "Line 1\r\n", "UTF-8", true);
            git.add().addFilepattern("file1.txt").call();
            RevCommit rev1 = git.commit().setAuthor("test", "[email protected]").setMessage("Commit Log 1").call();

            // commit some changes
            FileUtils.writeStringToFile(newFile, "Line 2\r\n", "UTF-8", true);
            git.add().addFilepattern("file1.txt").call();
            RevCommit rev2 = git.commit().setAll(true).setAuthor("test", "[email protected]").setMessage("Commit Log 2").call();

            // commit some changes
            FileUtils.writeStringToFile(newFile, "Line 3\r\n", "UTF-8", true);
            git.add().addFilepattern("file1.txt").call();
            RevCommit rev3 = git.commit().setAll(true).setAuthor("test", "[email protected]").setMessage("Commit Log 3").call();

            RevertCommand revertCommand = git.revert();
            // revert to revision 2
            revertCommand.include(rev2);
            RevCommit revCommit = revertCommand.call();


            // print logs
            Iterable<RevCommit> gitLog = git.log().call();
            Iterator<RevCommit> it = gitLog.iterator();
            while (it.hasNext()) {
                RevCommit logMessage = it.next();
                System.out.println(logMessage.getName() + " - " + logMessage.getFullMessage());
            }

        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

编辑：更正的代码。有点进步。现在打开文件时，内容是：

Line 1
<<<<<<< master
Line 2
Line 3
=======
>>>>>>> 54e7037 Commit Log 2

但是，我期待

Line 1
Line 2

Answer 1

RevertCommand.include()的javadoc状态包括对要恢复的提交的Ref，因此您实际上需要指定应该还原的提交，即rev3，而不是重置为的提交。

你实际尝试的是恢复在commit rev2中完成的更改，在这种情况下，它会导致与commit rev3的更改发生合并冲突。通过调用后通过getUnmergedPaths（）/ getFailingResults（）通过revertComment可以看到这一点。

所以下面应该添加第4次提交，它会从rev3恢复更改：

            RevertCommand revertCommand = git.revert();
            // revert to revision 2
            revertCommand.include(rev3);
            RevCommit revCommit = revertCommand.call();
            System.out.println("Reverted: " + revCommit);
            System.out.println("Reverted refs: " + revertCommand.getRevertedRefs());
            System.out.println("Unmerged paths: " + revertCommand.getUnmergedPaths());
            System.out.println("Failing results: " + revertCommand.getFailingResult());

            // print logs
            gitLog = git.log().call();
            for (RevCommit logMessage : gitLog) {
                System.out.println("After revert: " + logMessage.getName() + " - " + logMessage.getFullMessage());
            }

            System.out.println("File contents: " + FileUtils.readFileToString(newFile, "UTF-8"));