code: def _get_data_versions(data):
      
      genome_dir = install.get_genome_dir(data["genome_build"], data["dirs"].get("galaxy"), data)
      if genome_dir:
          version_file = os.path.join(genome_dir, "versions.csv")
          if version_file and os.path.exists(version_file):
              return version_file
      return None
docs: Retrieve CSV file with version information for reference data.