/**
 * {@code git checkout}
 */
private void checkout() {
	final String localBranch = getLocalTargetBranch();
	if (localBranch == null) {
		return;
	}
	try {
		final List<Ref> branchListResult = repo.branchList().call();
		final boolean localBranchExists = branchListResult.stream()
				.anyMatch(ref -> ref.getName().endsWith(localBranch));
		CheckoutCommand branchCmd = repo.checkout().setName(localBranch);
		if (!localBranchExists) {
			branchCmd = branchCmd.setCreateBranch(true).setUpstreamMode(SetupUpstreamMode.SET_UPSTREAM)
					.setStartPoint(mergeUnit.getBranchTarget());
		}
		branchCmd.call();
	} catch (GitAPIException e) {
		exception = new MergeUnitException(String.format("Could not checkout branch '%s'", localBranch), e); //$NON-NLS-1$
	}
}
 

public void reset(ProgressMonitor monitor) {
    try {
        // create branch and set upstream
        gitRepo.branchCreate()
                .setName(branch)
                .setUpstreamMode(SetupUpstreamMode.SET_UPSTREAM)
                .setStartPoint("origin/" + branch)
                .setForce(true)
                .call();
        
        // reset to remote head
        gitRepo.reset()
                .setProgressMonitor(monitor)
                .setMode(ResetType.SOFT)
                .setRef("refs/remotes/origin/" + branch)
                .call();
    } catch (Exception e) {
        logger.error("Exception caught while reseting to remote head: ", e);
    }
}
 

/**
 * Evaluate the commit message for the merge unit.
 */
private void evaluteCommitMessage() {
	final String localBranch = getLocalSourceBranch();
	if (localBranch == null) {
		return;
	}
	try {
		final List<Ref> branchListResult = repo.branchList().call();
		final boolean localBranchExists = branchListResult.stream()
				.anyMatch(ref -> ref.getName().endsWith(localBranch));
		CheckoutCommand branchCmd = repo.checkout().setName(localBranch);
		if (!localBranchExists) {
			branchCmd = branchCmd.setCreateBranch(true).setUpstreamMode(SetupUpstreamMode.SET_UPSTREAM)
					.setStartPoint(mergeUnit.getBranchSource());
		}
		branchCmd.call();

		final ObjectId id = ObjectId.fromString(mergeUnit.getRevisionInfo());
		commitMessage = repo.log().add(id).call().iterator().next().getFullMessage();
		/*
		 * Remove merge processor commit information, if the commmit is done by merge
		 * processor e.g. MP [29c64cf540d8f3ea116c3683eade862c3d996dfb] V1.1 -> master:
		 * (2018-03-06 12:17:22)
		 */
		commitMessage = commitMessage.replaceAll("MP \\[[A-Za-z0-9]*\\] .* -> .*: \\(.*\\) ", ""); //$NON-NLS-1$ //$NON-NLS-2$
	} catch (GitAPIException | MissingObjectException | IncorrectObjectTypeException e) {
		exception = new MergeUnitException(String.format("Could not checkout branch '%s'", localBranch), e); //$NON-NLS-1$
	}
}
 

/**
 * Create a local branch for remote tracking if it doesn't exist already.
 */
protected void createBranchIfNeeded(String branch) throws Exception {
    if (localRepo.findRef(branch) == null) {
        git.branchCreate()
           .setName(branch)
           .setUpstreamMode(SetupUpstreamMode.TRACK)
           .setStartPoint("origin/" + branch)
           .call();
    }
}
 

private void trackBranch(Git git, CheckoutCommand checkout, String label) {
	checkout.setCreateBranch(true).setName(label)
			.setUpstreamMode(SetupUpstreamMode.TRACK)
			.setStartPoint("origin/" + label);
}