code: def fetch():
      
      mir, r, slackpkg_last_date = mirror(), "", ""
      count, upgraded = 0, []
      if mir:
          tar = urlopen(mir)
          try:
              r = tar.read()
          except AttributeError:
              print("sun: error: can't read mirror")
      if os.path.isfile(var_lib_slackpkg + changelog_txt):
          slackpkg_last_date = read_file("{0}{1}".format(
              var_lib_slackpkg, changelog_txt)).split("\n", 1)[0].strip()
      else:
          return [count, upgraded]
      for line in r.splitlines():
          if slackpkg_last_date == line.strip():
              break
          if (line.endswith("z:  Upgraded.") or line.endswith("z:  Rebuilt.") or
                  line.endswith("z:  Added.") or line.endswith("z:  Removed.")):
              upgraded.append(line.split("/")[-1])
              count += 1
          if (line.endswith("*:  Upgraded.") or line.endswith("*:  Rebuilt.") or
                  line.endswith("*:  Added.") or line.endswith("*:  Removed.")):
              upgraded.append(line)
              count += 1
      return [count, upgraded]
docs: Get ChangeLog.txt file size and counts upgraded packages