private void deleteAllRefs() throws Exception {
final RevWalk rw = new RevWalk(db);
for (final Ref r : db.getAllRefs().values()) {
if (Constants.HEAD.equals(r.getName())) continue;
final RefUpdate u = db.updateRef(r.getName());
u.setForceUpdate(true);
u.delete(rw);
}
}
private void doCheckout(final Ref branch) throws IOException {
if (branch == null) throw die("cannot checkout; no HEAD advertised by remote");
if (!Constants.HEAD.equals(branch.getName())) db.writeSymref(Constants.HEAD, branch.getName());
final Commit commit = db.mapCommit(branch.getObjectId());
final RefUpdate u = db.updateRef(Constants.HEAD);
u.setNewObjectId(commit.getCommitId());
u.forceUpdate();
final GitIndex index = new GitIndex(db);
final Tree tree = commit.getTree();
final WorkDirCheckout co;
co = new WorkDirCheckout(db, db.getWorkDir(), index, tree);
co.checkout();
index.write();
}