daemon.py 文件源码

def demote(self):
        # demote root user to any specified user or group
        try:
            if os.getuid() == 0:
                # drop supplementary groups
                os.setgroups([])
                if self.group:
                    try:
                        os.setgid(self.the_grp.gr_gid)
                    except Exception, ex:
                        logging.critical("failed to set group to \"%s\" [%s]" % (self.group, str(ex)))
                        sys.exit(1)
                if self.user:
                    try:
                        the_pwd = pwd.getpwnam(self.user)
                        os.setuid(self.the_pwd.pw_uid)
                    except Exception, ex:
                        logging.critical("failed to set user to \"%s\" [%s]" % (self.user, str(ex)))
                        sys.exit(1)
            else:
                if self.user or self.group:
                    logging.critical('not privileged ~~ cannot change to user [%s] / group [%s]' % (self.user, self.group))
                    sys.exit(1)
        except Exception, ex:
            logging.critical("daemon.demote() caught exception [%s]" % str(ex))
            sys.exit(1)