Golang ConfigSetterWriter.MongoVersion方法代码示例

// Restore handles either returning or creating a controller to a backed up status:
// * extracts the content of the given backup file and:
// * runs mongorestore with the backed up mongo dump
// * updates and writes configuration files
// * updates existing db entries to make sure they hold no references to
// old instances
// * updates config in all agents.
func (b *backups) Restore(backupId string, dbInfo *DBInfo, args RestoreArgs) (names.Tag, error) {
	meta, backupReader, err := b.Get(backupId)
	if err != nil {
		return nil, errors.Annotatef(err, "could not fetch backup %q", backupId)
	}

	defer backupReader.Close()

	workspace, err := NewArchiveWorkspaceReader(backupReader)
	if err != nil {
		return nil, errors.Annotate(err, "cannot unpack backup file")
	}
	defer workspace.Close()

	// This might actually work, but we don't have a guarantee so we don't allow it.
	if meta.Origin.Series != args.NewInstSeries {
		return nil, errors.Errorf("cannot restore a backup made in a machine with series %q into a machine with series %q, %#v", meta.Origin.Series, args.NewInstSeries, meta)
	}

	// TODO(perrito666) Create a compatibility table of sorts.
	vers := meta.Origin.Version
	if vers.Major != 2 {
		return nil, errors.Errorf("Juju version %v cannot restore backups made using Juju version %v", version.Current.Minor, vers)
	}
	backupMachine := names.NewMachineTag(meta.Origin.Machine)

	// The path for the config file might change if the tag changed
	// and also the rest of the path, so we assume as little as possible.
	oldDatadir, err := paths.DataDir(args.NewInstSeries)
	if err != nil {
		return nil, errors.Annotate(err, "cannot determine DataDir for the restored machine")
	}

	var oldAgentConfig agent.ConfigSetterWriter
	oldAgentConfigFile := agent.ConfigPath(oldDatadir, args.NewInstTag)
	if oldAgentConfig, err = agent.ReadConfig(oldAgentConfigFile); err != nil {
		return nil, errors.Annotate(err, "cannot load old agent config from disk")
	}

	logger.Infof("stopping juju-db")
	if err = mongo.StopService(); err != nil {
		return nil, errors.Annotate(err, "failed to stop mongo")
	}

	// delete all the files to be replaced
	if err := PrepareMachineForRestore(oldAgentConfig.MongoVersion()); err != nil {
		return nil, errors.Annotate(err, "cannot delete existing files")
	}
	logger.Infof("deleted old files to place new")

	if err := workspace.UnpackFilesBundle(filesystemRoot()); err != nil {
		return nil, errors.Annotate(err, "cannot obtain system files from backup")
	}
	logger.Infof("placed new restore files")

	var agentConfig agent.ConfigSetterWriter
	// The path for the config file might change if the tag changed
	// and also the rest of the path, so we assume as little as possible.
	datadir, err := paths.DataDir(args.NewInstSeries)
	if err != nil {
		return nil, errors.Annotate(err, "cannot determine DataDir for the restored machine")
	}
	agentConfigFile := agent.ConfigPath(datadir, backupMachine)
	if agentConfig, err = agent.ReadConfig(agentConfigFile); err != nil {
		return nil, errors.Annotate(err, "cannot load agent config from disk")
	}
	ssi, ok := agentConfig.StateServingInfo()
	if !ok {
		return nil, errors.Errorf("cannot determine state serving info")
	}
	APIHostPorts := network.NewHostPorts(ssi.APIPort, args.PrivateAddress, args.PublicAddress)
	agentConfig.SetAPIHostPorts([][]network.HostPort{APIHostPorts})
	if err := agentConfig.Write(); err != nil {
		return nil, errors.Annotate(err, "cannot write new agent configuration")
	}
	logger.Infof("wrote new agent config for restore")

	if backupMachine.Id() != "0" {
		logger.Infof("extra work needed backup belongs to %q machine", backupMachine.String())
		serviceName := "jujud-" + agentConfig.Tag().String()
		aInfo := service.NewMachineAgentInfo(
			agentConfig.Tag().Id(),
			dataDir,
			paths.MustSucceed(paths.LogDir(args.NewInstSeries)),
		)

		// TODO(perrito666) renderer should have a RendererForSeries, for the moment
		// restore only works on linuxes.
		renderer, _ := shell.NewRenderer("bash")
		serviceAgentConf := service.AgentConf(aInfo, renderer)
		svc, err := service.NewService(serviceName, serviceAgentConf, args.NewInstSeries)
		if err != nil {
			return nil, errors.Annotate(err, "cannot generate service for the restored agent.")
//.........这里部分代码省略.........