code: def _build_job_meta(cls, job_dir):
          
          meta_file = os.path.join(job_dir, JOB_META_FILE)
          meta = parse_json(meta_file)
  
          if not meta:
              job_name = job_dir.split("/")[-1]
              user = os.environ.get("USER", None)
              meta = {
                  "job_id": job_name,
                  "job_name": job_name,
                  "user": user,
                  "type": "ray",
                  "start_time": os.path.getctime(job_dir),
                  "end_time": None,
                  "best_trial_id": None,
              }
  
          if meta.get("start_time", None):
              meta["start_time"] = timestamp2date(meta["start_time"])
  
          return meta
docs: Build meta file for job.
  
          Args:
              job_dir (str): Directory path of the job.
  
          Return:
              A dict of job meta info.