def is_git_repo(folder):
    with utils.chdir(folder):
        try:
            shell.git('rev-parse', '--git-dir')
        except CalledProcessError:
            return False
        return True
Async version of delete_multi() -- note different return value.
dataset/ETHPy150Open blue-yonder/pyscaffold/pyscaffold/repo.py/is_git_repo--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/memcache/__init__.py/Client.delete_multi_async