nova liberty 版本中 修改 admin passowd 的流程分析

nova

在nova 的liberty 版本中 修改 admin password 的方法和线上产品修改passowd 的方法

    def set_admin_password(self, context, instance, new_pass):
        """Set the root/admin password for an instance on this host.
        This is generally only called by API password resets after an
        image has been built.
        @param context: Nova auth context.
        @param instance: Nova instance object.
        @param new_pass: The admin password for the instance.
        """
        import pdb;pdb.set_trace()
        context = context.elevated()
        if new_pass is None:
            # Generate a random password
            new_pass = utils.generate_password()
        current_power_state = self._get_power_state(context, instance)
        expected_state = power_state.RUNNING
        if current_power_state != expected_state:
            instance.task_state = None
            instance.save(expected_task_state=task_states.UPDATING_PASSWORD)
            _msg = _('instance %s is not running') % instance.uuid
            raise exception.InstancePasswordSetFailed(
                instance=instance.uuid, reason=_msg)
        try:
            self.driver.set_admin_password(instance, new_pass)
            LOG.info(_LI("Root password set"), instance=instance)
            instance.task_state = None
            instance.save(
                expected_task_state=task_states.UPDATING_PASSWORD)
        except NotImplementedError:
            LOG.warning(_LW('set_admin_password is not implemented '
                            'by this driver or guest instance.'),
                        instance=instance)
            instance.task_state = None
            instance.save(
                expected_task_state=task_states.UPDATING_PASSWORD)
            raise NotImplementedError(_('set_admin_password is not '
                                        'implemented by this driver or guest '
                                        'instance.'))
                except exception.UnexpectedTaskStateError:
            # interrupted by another (most likely delete) task
            # do not retry
            raise
        except Exception:
            # Catch all here because this could be anything.
            LOG.exception(_LE('set_admin_password failed'),
                          instance=instance)
            self._set_instance_obj_error_state(context, instance)
            # We create a new exception here so that we won't
            # potentially reveal password information to the
            # API caller.  The real exception is logged above
            _msg = _('error setting admin password')
            raise exception.InstancePasswordSetFailed(
                instance=instance.uuid, reason=_msg)