utils.py 文件源码

def open(self):
            self.__inPos = 0
            self.__inPosOld = 0
            self.__outFile = None
            self.__current = DirHasher.FileIndex.Stat()
            try:
                if os.path.exists(self.__cachePath):
                    self.__inFile = open(self.__cachePath, "rb")
                    sig = self.__inFile.read(4)
                    if sig == DirHasher.FileIndex.SIGNATURE:
                        self.__mismatch = False
                        self.__inPos = self.__inPosOld = 4
                        self.__readEntry() # prefetch first entry
                    else:
                        logging.getLogger(__name__).info(
                            "Wrong signature at '%s': %s", self.__cachePath, sig)
                        self.__inFile.close()
                        self.__inFile = None
                        self.__mismatch = True
                else:
                    self.__inFile = None
                    self.__mismatch = True
            except OSError as e:
                raise BuildError("Error opening hash cache: " + str(e))