private void updateHead(final Commit commit) throws IOException {
final RefUpdate refUpdate = repository.updateRef(branchName);
refUpdate.setNewObjectId(commit.getCommitId());
refUpdate.setRefLogMessage(commit.getMessage(), false);
refUpdate.forceUpdate();
final RefUpdate refUpdate2 = repository.updateRef(Constants.HEAD);
refUpdate2.setNewObjectId(commit.getCommitId());
refUpdate2.setRefLogMessage(commit.getMessage(), false);
refUpdate2.forceUpdate();
}
