code: def get_version_from_cache_dir(src_file):
      
      if src_file is None:
          return None
  
      tmp_dir = local.path(str(CFG["tmp_dir"]))
      if tmp_dir.exists():
          cache_file = tmp_dir / src_file
          dir_hash = get_hash_of_dirs(cache_file)
          if dir_hash is None:
              return None
          if len(str(dir_hash)) <= 7:
              return str(dir_hash)
          return str(dir_hash)[:7]
      return None
docs: Creates a version for a project out of the hash.
  
      The hash is taken from the directory of the source file.
  
      Args:
          src_file: The source file of the project using this function.
  
      Returns:
          Either returns the first 8 digits of the hash as string,
          the entire hash as a string if the hash consists out of less
          than 7 digits or None if the path is incorrect.