Retrieving Commit Message Log from Git Using JGit

问题

I just want to retrieve the commitlog from Git repository that has messages for all the commit you've done on a specific repopsitory. I had found some code snippets for achieve this and ends with an exception.

try {
    FileRepositoryBuilder builder = new FileRepositoryBuilder();
    Repository repo = builder.setGitDir(new File("https://github.com/name/repository.git")).readEnvironment().findGitDir().build();
    RevWalk walk =new RevWalk(repo);
    ObjectId head = repo.resolve(Constants.HEAD);
    RevCommit commit =walk.parseCommit(head);
    Git git =new Git(repo);
    Iterable<RevCommit> gitLog = git.log().call();
    Iterator<RevCommit> it = gitLog.iterator();
    while(it.hasNext())
    {
        RevCommit logMessage = it.next(); 
        System.out.println(logMessage.getFullMessage());
    }
}
catch(Exception e) {
    e.printStackTrace();
}

However it gives me:

org.eclipse.jgit.api.errors.NoHeadException: No HEAD exists and no explicit starting revision was specified exception.

How do I get rid of this? I am using org.eclipse.jgit JAR version 2.0.0.201206130900-r

回答1:

This is correct of piece of code will do the above..

FileRepositoryBuilder builder = new FileRepositoryBuilder();
Repository repo = builder.setGitDir(new File("localrepositary"+"\\.git")).setMustExist(true).build();
Git git = new Git(repo);
Iterable<RevCommit> log = git.log().call();
for (Iterator<RevCommit> iterator = log.iterator(); iterator.hasNext();) {
  RevCommit rev = iterator.next();
  logMessages.add(rev.getFullMessage());
}

回答2:

If https://github.com/name/repository.git is the URL of the repository that you want to get the log from you will have to clone it first:

CloneCommand cloneCommand = Git.cloneRepository();
cloneCommand.setDirectory( new File( "/path/to/local/repo" ) );
cloneCommand.setURI( "https://github.com/name/repository.git" );
Git git = cloneCommand.call();
...
git.getRepository().close();

This creates a local clone of the remote repository in /path/to/local/repo. Note that the repo directory must be non-existing or empty prior to calling cloneCommand. This repository can then be examined with git.log().

Make sure to close the repository once you are done using it to avoid leaking file handles.

来源：https://stackoverflow.com/questions/24647403/retrieving-commit-message-log-from-git-using-jgit

标签

java

git

jgit