*/
public RevCommit tryFastForward(RevCommit newCommit) throws IOException,
GitAPIException {
Ref head = repo.getRef(Constants.HEAD);
if (head == null || head.getObjectId() == null)
throw new RefNotFoundException(MessageFormat.format(
JGitText.get().refNotResolved, Constants.HEAD));
ObjectId headId = head.getObjectId();
if (headId == null)
throw new RefNotFoundException(MessageFormat.format(
JGitText.get().refNotResolved, Constants.HEAD));
RevCommit headCommit = walk.lookupCommit(headId);
if (walk.isMergedInto(newCommit, headCommit))
return newCommit;