'Recursive search for Dockerfiles in the working directory.'

def find_dockerfiles(self):

    self.docker_build_paths = list()
    path = self.working_dir
    filename = 'Dockerfile.j2'
    for (root, dirs, names) in os.walk(path):
        if (filename in names):
            self.docker_build_paths.append(root)
            LOG.debug('Found    %s', root.split(self.working_dir)[1])
    LOG.debug('Found    %d    Dockerfiles', len(self.docker_build_paths))
