code: def start(self, timeout_secs=60):
          
  
          def _handle_timeout(signum, frame):
              raise HerokuTimeoutError(
                  "Failed to start after {} seconds.".format(timeout_secs, self._record)
              )
  
          if self.is_running:
              self.out.log("Local Heroku is already running.")
              return
  
          signal.signal(signal.SIGALRM, _handle_timeout)
          signal.alarm(timeout_secs)
          self._boot()
          try:
              success = self._verify_startup()
          finally:
              signal.alarm(0)
  
          if not success:
              self.stop(signal.SIGKILL)
              raise HerokuStartupError(
                  "Failed to start for unknown reason: {}".format(self._record)
              )
          return True
docs: Start the heroku local subprocess group and verify that
          it has started successfully.
  
          The subprocess output is checked for a line matching 'success_regex'
          to indicate success. If no match is seen after 'timeout_secs',
          a HerokuTimeoutError is raised.