changed.py 文件源码

def create_checksum(self):
        """
        Creating a checksums of checksums to detect a change
        even if there are multiple files used to configure a service.
        Cleanup old checksumfiles if the config was removed.
        """
        checksums = ''
        for _file in self.service_conf_files:
            if os.path.exists(_file):
                log.debug("Generating checksum for {}".format(_file))
                md5 = hashlib.md5(open(_file, 'rb').read()).hexdigest()
                log.debug("Checksum: {}".format(md5))
                checksums += md5
        if checksums:
            return hashlib.md5(checksums).hexdigest()
        log.debug(("No file found to generate a checksum from. Looked for "
                   "{}".format(self.service_conf_files)))
        if os.path.exists(self.checksum_file):
            os.remove(self.checksum_file)
        return None