docs: def loadOptionsFile(self, _here=None):
          """Find the .buildbot/options file. Crawl from the current directory
          up towards the root, and also look in ~/.buildbot . The first directory
          that's owned by the user and has the file we're looking for wins.
          Windows skips the owned-by-user test.
  
          @rtype:  dict
          @return: a dictionary of names defined in the options file. If no
              options file was found, return an empty dict.
          """
  
          here = _here or os.path.abspath(os.getcwd())
  
          if runtime.platformType == 'win32':
              # never trust env-vars, use the proper API
              from win32com.shell import shellcon, shell
              appdata = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)
              home = os.path.join(appdata, "buildbot")
          else:
              home = os.path.expanduser("~/.buildbot")
  
          searchpath = []
          toomany = 20
          while True:
              searchpath.append(os.path.join(here, ".buildbot"))
              next = os.path.dirname(here)
              if next == here:
                  break  # we've hit the root
              here = next
              toomany -= 1  # just in case
              if toomany == 0:
                  print("I seem to have wandered up into the infinite glories "
                        "of the heavens. Oops.")
                  break
  
          searchpath.append(home)
  
          localDict = {}
  
          for d in searchpath:
              if os.path.isdir(d):
                  if runtime.platformType != 'win32':
                      if os.stat(d)[stat.ST_UID] != os.getuid():
                          print("skipping %s because you don't own it" % d)
                          continue  # security, skip other people's directories
                  optfile = os.path.join(d, "options")
                  if os.path.exists(optfile):
                      try:
                          with open(optfile, "r") as f:
                              options = f.read()
                          exec(options, localDict)
                      except Exception:
                          print("error while reading %s" % optfile)
                          raise
                      break
  
          for k in list(localDict.keys()):  # pylint: disable=consider-iterating-dictionary
              if k.startswith("__"):
                  del localDict[k]
          return localDict