in lib/google/serverless/exec.rb [584:593]
def service_from_config
return nil if !@config_path && @service
@config_path ||= Exec.default_config_path
::YAML.load_file(config_path)["service"]
rescue ::Errno::ENOENT
raise ConfigFileNotFound, @config_path
rescue ::StandardError
raise BadConfigFileFormat, @config_path
end