// Build creates a new resolver for the given target.
//
// gRPC dial calls Build synchronously, and fails if the returned error is
// not nil.
503610
func (b *kubeBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOption) (resolver.Resolver, error) {
	if b.k8sClient == nil {
		if cl, err := NewInClusterK8sClient(); err == nil {
			b.k8sClient = cl
		} else {
			return nil, err
		}
	}
	ti, err := parseResolverTarget(target)
	if err != nil {
		return nil, err
	}
	ctx, cancel := context.WithCancel(context.Background())
	r := &kResolver{
		target:    ti,
		ctx:       ctx,
		cancel:    cancel,
		cc:        cc,
		rn:        make(chan struct{}, 1),
		k8sClient: b.k8sClient,
		t:         time.NewTimer(defaultFreq),
		freq:      defaultFreq,

		endpoints: endpointsForTarget.WithLabelValues(ti.String()),
		addresses: addressesForTarget.WithLabelValues(ti.String()),
	}
	go until(func() {
		r.wg.Add(1)
		err := r.watch()
		if err != nil && err != io.EOF {
			grpclog.Errorf("kuberesolver: watching ended with error='%v', will reconnect again", err)
		}
	}, time.Second, ctx.Done())
	return r, nil
}
1324559
func (f *Builder) Build(ctx context.Context, names []string) func(*http.Response) error {
	var modifiers []func(*http.Response) error

	for _, middleName := range names {
		if conf, ok := f.configs[middleName]; ok {
			if conf.Headers != nil {
				getLogger(ctx, middleName, "Headers").Debug("Creating Middleware (ResponseModifier)")

				modifiers = append(modifiers, buildHeaders(conf.Headers))
			} else if conf.Chain != nil {
				getLogger(ctx, middleName, "Chain").Debug("Creating Middleware (ResponseModifier)")

				modifiers = append(modifiers, f.Build(ctx, conf.Chain.Middlewares))
			}
		}
	}

	if len(modifiers) > 0 {
		return func(resp *http.Response) error {
			for i := len(modifiers); i > 0; i-- {
				err := modifiers[i-1](resp)
				if err != nil {
					return err
				}
			}
			return nil
		}
	}

	return func(response *http.Response) error { return nil }
}
126173
func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOption) (resolver.Resolver, error) {
	host, port, err := parseTarget(target.Endpoint, defaultPort)
	if err != nil {
		return nil, err
	}

	// IP address.
	if net.ParseIP(host) != nil {
		host, _ = formatIP(host)
		addr := []resolver.Address{{Addr: host + ":" + port}}
		i := &ipResolver{
			cc: cc,
			ip: addr,
			rn: make(chan struct{}, 1),
			q:  make(chan struct{}),
		}
		cc.NewAddress(addr)
		go i.watcher()
		return i, nil
	}

	// DNS address (non-IP).
	ctx, cancel := context.WithCancel(context.Background())
	d := &dnsResolver{
		freq:                 b.minFreq,
		backoff:              backoff.Exponential{MaxDelay: b.minFreq},
		host:                 host,
		port:                 port,
		ctx:                  ctx,
		cancel:               cancel,
		cc:                   cc,
		t:                    time.NewTimer(0),
		rn:                   make(chan struct{}, 1),
		disableServiceConfig: opts.DisableServiceConfig,
	}

	if target.Authority == "" {
		d.resolver = defaultResolver
	} else {
		d.resolver, err = customAuthorityResolver(target.Authority)
		if err != nil {
			return nil, err
		}
	}

	d.wg.Add(1)
	go d.watcher()
	return d, nil
}
322446
func (b *Builder) Build() (abbrev, aranges, frame, info, line, pubnames, ranges, str, loc []byte, err error) {
	b.TagClose()

	if len(b.tagStack) > 0 {
		err = fmt.Errorf("unbalanced TagOpen/TagClose %d", len(b.tagStack))
		return
	}

	abbrev = b.makeAbbrevTable()
	info = b.info.Bytes()
	binary.LittleEndian.PutUint32(info, uint32(len(info)-4))
	loc = b.loc.Bytes()

	return
}
1219849
func (s *Service) Build(ctx context.Context, buildOptions options.Build) error {
	return s.build(ctx, buildOptions)
}
554518
func (b *UpdateServiceBuilder) Build(c *fi.ModelBuilderContext) error {
	if b.Cluster.Spec.UpdatePolicy == nil || *b.Cluster.Spec.UpdatePolicy != kops.UpdatePolicyExternal {
		glog.Infof("UpdatePolicy not set in Cluster Spec; skipping creation of %s", ServiceName)
		return nil
	}

	for _, spec := range [][]kops.HookSpec{b.InstanceGroup.Spec.Hooks, b.Cluster.Spec.Hooks} {
		for _, hook := range spec {
			if hook.Name == ServiceName || hook.Name == ServiceName+".service" {
				glog.Infof("Detected kops Hook for '%s'; skipping creation", ServiceName)
				return nil
			}
		}
	}

	if b.Distribution == distros.DistributionCoreOS {
		glog.Infof("Detected OS %s; building %s service to disable update scheduler", ServiceName, b.Distribution)
		c.AddTask(b.buildCoreOSSystemdService())
	}

	return nil
}
230281
func (builder *FetchSchemaCommandBuilder) Build() (Command, error) {
	if builder.protobuf == nil {
		panic("builder.protobuf must not be nil")
	}
	return &FetchSchemaCommand{protobuf: builder.protobuf}, nil
}
467547
func (builder *OnBuild) Build(config *api.Config) (*api.Result, error) {
	buildResult := &api.Result{}

	if config.BlockOnBuild {
		buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
			utilstatus.ReasonOnBuildForbidden,
			utilstatus.ReasonMessageOnBuildForbidden,
		)
		return buildResult, fmt.Errorf("builder image uses ONBUILD instructions but ONBUILD is not allowed")
	}
	glog.V(2).Info("Preparing the source code for build")
	// Change the installation directory for this config to store scripts inside
	// the application root directory.
	if err := builder.source.Prepare(config); err != nil {
		return buildResult, err
	}

	// If necessary, copy the STI scripts into application root directory
	builder.copySTIScripts(config)

	glog.V(2).Info("Creating application Dockerfile")
	if err := builder.CreateDockerfile(config); err != nil {
		buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
			utilstatus.ReasonDockerfileCreateFailed,
			utilstatus.ReasonMessageDockerfileCreateFailed,
		)
		return buildResult, err
	}

	glog.V(2).Info("Creating application source code image")
	tarStream := builder.tar.CreateTarStreamReader(filepath.Join(config.WorkingDir, "upload", "src"), false)
	defer tarStream.Close()

	outReader, outWriter := io.Pipe()
	go io.Copy(os.Stdout, outReader)

	opts := docker.BuildImageOptions{
		Name:         config.Tag,
		Stdin:        tarStream,
		Stdout:       outWriter,
		CGroupLimits: config.CGroupLimits,
	}

	glog.V(2).Info("Building the application source")
	if err := builder.docker.BuildImage(opts); err != nil {
		buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
			utilstatus.ReasonDockerImageBuildFailed,
			utilstatus.ReasonMessageDockerImageBuildFailed,
		)
		return buildResult, err
	}

	glog.V(2).Info("Cleaning up temporary containers")
	builder.garbage.Cleanup(config)

	var imageID string
	var err error
	if len(opts.Name) > 0 {
		if imageID, err = builder.docker.GetImageID(opts.Name); err != nil {
			buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
				utilstatus.ReasonGenericS2IBuildFailed,
				utilstatus.ReasonMessageGenericS2iBuildFailed,
			)
			return buildResult, err
		}
	}

	return &api.Result{
		Success:    true,
		WorkingDir: config.WorkingDir,
		ImageID:    imageID,
	}, nil
}
1245312
func (builder *FetchSetCommandBuilder) Build() (Command, error) {
	if builder.protobuf == nil {
		panic("builder.protobuf must not be nil")
	}
	if err := validateLocatable(builder.protobuf); err != nil {
		return nil, err
	}
	return &FetchSetCommand{
		timeoutImpl: timeoutImpl{
			timeout: builder.timeout,
		},
		protobuf: builder.protobuf,
	}, nil
}
906810
func (b *multiErrBuilder) Build() error {
	if len(b.errs) == 0 {
		return nil
	}

	msgs := make([]string, len(b.errs))

	for i, err := range b.errs {
		msgs[i] = err.Error()
	}

	return errors.New(strings.Join(msgs, " AND "))
}
79981
func (builder *ListKeysCommandBuilder) Build() (Command, error) {
	if builder.protobuf == nil {
		panic("builder.protobuf must not be nil")
	}
	if err := validateLocatable(builder.protobuf); err != nil {
		return nil, err
	}
	if builder.streaming && builder.callback == nil {
		return nil, newClientError("ListKeysCommand requires a callback when streaming.", nil)
	}
	if !builder.allowListing {
		return nil, ErrListingDisabled
	}
	return &ListKeysCommand{
		listingImpl: listingImpl{
			allowListing: builder.allowListing,
		},
		timeoutImpl: timeoutImpl{
			timeout: builder.timeout,
		},
		protobuf:  builder.protobuf,
		streaming: builder.streaming,
		callback:  builder.callback,
	}, nil
}
284407
func (c *Client) Build(namespace string, reader io.Reader) (Result, error) {
	var result Result
	result, err := c.newBuilder(namespace, reader).Infos()
	return result, scrubValidationError(err)
}
280963
func (c *messageCommand) build(sn shortNoncer, sk *precomputedKey, data []byte, sentByServer bool) error {

	total := uint64(8 + 8 + 16 + 1)
	total += uint64(len(data))

	_, err := c.realloc(total)
	if err != nil {
		return err
	}

	destHeader := c.buf[:8]
	destUnprefixedNonce := c.buf[8:16]
	destEncMessageBox := c.buf[16:total]

	var prefix [16]byte
	if sentByServer {
		prefix = serverMessageNoncePrefix
	} else {
		prefix = clientMessageNoncePrefix
	}
	prefixedNonce, unprefixedNonce, err := sn.prefixAndBump(prefix)
	if err != nil {
		return err
	}

	payload := append([]byte{0}, data...)
	encMessageBox := box.SealAfterPrecomputation(nil, payload, &prefixedNonce, (*[32]byte)(sk))

	copy(destHeader, []byte{7, 'M', 'E', 'S', 'S', 'A', 'G', 'E'})
	copy(destUnprefixedNonce, unprefixedNonce[:])
	copy(destEncMessageBox, encMessageBox)

	return nil
}
625666
func (b *SysctlBuilder) Build(c *fi.ModelBuilderContext) error {
	var sysctls []string

	// Common settings
	{
		sysctls = append(sysctls,
			"# Kubernetes Settings",
			"")

		// A higher vm.max_map_count is great for elasticsearch, mongo, or other mmap users
		// See https://github.com/kubernetes/kops/issues/1340
		sysctls = append(sysctls, "vm.max_map_count = 262144",
			"")

		// See https://github.com/kubernetes/kubernetes/pull/38001
		sysctls = append(sysctls,
			"kernel.softlockup_panic = 1",
			"kernel.softlockup_all_cpu_backtrace = 1",
			"")

		// See https://github.com/kubernetes/kops/issues/6342
		portRange := b.Cluster.Spec.KubeAPIServer.ServiceNodePortRange
		if portRange == "" {
			portRange = "30000-32767" // Default kube-apiserver ServiceNodePortRange
		}
		sysctls = append(sysctls, "net.ipv4.ip_local_reserved_ports = "+portRange,
			"")

		// See https://github.com/kubernetes/kube-deploy/issues/261
		sysctls = append(sysctls,
			"# Increase the number of connections",
			"net.core.somaxconn = 32768",
			"",

			"# Maximum Socket Receive Buffer",
			"net.core.rmem_max = 16777216",
			"",

			"# Default Socket Send Buffer",
			"net.core.wmem_max = 16777216",
			"",

			"# Increase the maximum total buffer-space allocatable",
			"net.ipv4.tcp_wmem = 4096 12582912 16777216",
			"net.ipv4.tcp_rmem = 4096 12582912 16777216",
			"",

			"# Increase the number of outstanding syn requests allowed",
			"net.ipv4.tcp_max_syn_backlog = 8096",
			"",

			"# For persistent HTTP connections",
			"net.ipv4.tcp_slow_start_after_idle = 0",
			"",

			"# Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks",
			"net.ipv4.tcp_tw_reuse = 1",
			"",

			// We can't change the local_port_range without changing the NodePort range
			//"# Allowed local port range",
			//"net.ipv4.ip_local_port_range = 10240 65535",
			//"",

			"# Max number of packets that can be queued on interface input",
			"# If kernel is receiving packets faster than can be processed",
			"# this queue increases",
			"net.core.netdev_max_backlog = 16384",
			"",

			"# Increase size of file handles and inode cache",
			"fs.file-max = 2097152",
			"",

			"# Max number of inotify instances and watches for a user",
			"# Since dockerd runs as a single user, the default instances value of 128 per user is too low",
			"# e.g. uses of inotify: nginx ingress controller, kubectl logs -f",
			"fs.inotify.max_user_instances = 8192",
			"fs.inotify.max_user_watches = 524288",
			"",
		)
	}

	if b.Cluster.Spec.CloudProvider == string(kops.CloudProviderAWS) {
		sysctls = append(sysctls,
			"# AWS settings",
			"",
			"# Issue #23395",
			"net.ipv4.neigh.default.gc_thresh1=0",
			"")
	}

	sysctls = append(sysctls,
		"# Prevent docker from changing iptables: https://github.com/kubernetes/kubernetes/issues/40182",
		"net.ipv4.ip_forward=1",
		"")

	c.AddTask(&nodetasks.File{
		Path:            "/etc/sysctl.d/99-k8s-general.conf",
		Contents:        fi.NewStringResource(strings.Join(sysctls, "\n")),
		Type:            nodetasks.FileType_File,
		OnChangeExecute: [][]string{{"sysctl", "--system"}},
	})

	return nil
}
722292
func (c *Core) Build(n string) (Build, error) {
	// Setup the builder
	configBuilder, ok := c.builds[n]
	if !ok {
		return nil, fmt.Errorf("no such build found: %s", n)
	}
	builder, err := c.components.Builder(configBuilder.Type)
	if err != nil {
		return nil, fmt.Errorf(
			"error initializing builder '%s': %s",
			configBuilder.Type, err)
	}
	if builder == nil {
		return nil, fmt.Errorf(
			"builder type not found: %s", configBuilder.Type)
	}

	// rawName is the uninterpolated name that we use for various lookups
	rawName := configBuilder.Name

	// Setup the provisioners for this build
	provisioners := make([]coreBuildProvisioner, 0, len(c.Template.Provisioners))
	for _, rawP := range c.Template.Provisioners {
		// If we're skipping this, then ignore it
		if rawP.OnlyExcept.Skip(rawName) {
			continue
		}

		// Get the provisioner
		provisioner, err := c.components.Provisioner(rawP.Type)
		if err != nil {
			return nil, fmt.Errorf(
				"error initializing provisioner '%s': %s",
				rawP.Type, err)
		}
		if provisioner == nil {
			return nil, fmt.Errorf(
				"provisioner type not found: %s", rawP.Type)
		}

		// Get the configuration
		config := make([]interface{}, 1, 2)
		config[0] = rawP.Config
		if rawP.Override != nil {
			if override, ok := rawP.Override[rawName]; ok {
				config = append(config, override)
			}
		}

		// If we're pausing, we wrap the provisioner in a special pauser.
		if rawP.PauseBefore > 0 {
			provisioner = &PausedProvisioner{
				PauseBefore: rawP.PauseBefore,
				Provisioner: provisioner,
			}
		} else if rawP.Timeout > 0 {
			provisioner = &TimeoutProvisioner{
				Timeout:     rawP.Timeout,
				Provisioner: provisioner,
			}
		}

		provisioners = append(provisioners, coreBuildProvisioner{
			pType:       rawP.Type,
			provisioner: provisioner,
			config:      config,
		})
	}

	// Setup the post-processors
	postProcessors := make([][]coreBuildPostProcessor, 0, len(c.Template.PostProcessors))
	for _, rawPs := range c.Template.PostProcessors {
		current := make([]coreBuildPostProcessor, 0, len(rawPs))
		for _, rawP := range rawPs {
			if rawP.Skip(rawName) {
				continue
			}
			// -except skips post-processor & build
			foundExcept := false
			for _, except := range c.except {
				if except != "" && except == rawP.Name {
					foundExcept = true
				}
			}
			if foundExcept {
				continue
			}

			// Get the post-processor
			postProcessor, err := c.components.PostProcessor(rawP.Type)
			if err != nil {
				return nil, fmt.Errorf(
					"error initializing post-processor '%s': %s",
					rawP.Type, err)
			}
			if postProcessor == nil {
				return nil, fmt.Errorf(
					"post-processor type not found: %s", rawP.Type)
			}

			current = append(current, coreBuildPostProcessor{
				processor:         postProcessor,
				processorType:     rawP.Type,
				config:            rawP.Config,
				keepInputArtifact: rawP.KeepInputArtifact,
			})
		}

		// If we have no post-processors in this chain, just continue.
		if len(current) == 0 {
			continue
		}

		postProcessors = append(postProcessors, current)
	}

	// TODO hooks one day

	return &coreBuild{
		name:           n,
		builder:        builder,
		builderConfig:  configBuilder.Config,
		builderType:    configBuilder.Type,
		postProcessors: postProcessors,
		provisioners:   provisioners,
		templatePath:   c.Template.Path,
		variables:      c.variables,
	}, nil
}
59205
func (b *Builder) Build(ctx context.Context, opt backend.BuildConfig) (*builder.Result, error) {
	var rc = opt.Source

	if buildID := opt.Options.BuildID; buildID != "" {
		b.mu.Lock()

		upload := false
		if strings.HasPrefix(buildID, "upload-request:") {
			upload = true
			buildID = strings.TrimPrefix(buildID, "upload-request:")
		}

		if _, ok := b.jobs[buildID]; !ok {
			b.jobs[buildID] = newBuildJob()
		}
		j := b.jobs[buildID]
		var cancel func()
		ctx, cancel = context.WithCancel(ctx)
		j.cancel = cancel
		b.mu.Unlock()

		if upload {
			ctx2, cancel := context.WithTimeout(ctx, 5*time.Second)
			defer cancel()
			err := j.SetUpload(ctx2, rc)
			return nil, err
		}

		if remoteContext := opt.Options.RemoteContext; remoteContext == "upload-request" {
			ctx2, cancel := context.WithTimeout(ctx, 5*time.Second)
			defer cancel()
			var err error
			rc, err = j.WaitUpload(ctx2)
			if err != nil {
				return nil, err
			}
			opt.Options.RemoteContext = ""
		}

		defer func() {
			delete(b.jobs, buildID)
		}()
	}

	var out builder.Result

	id := identity.NewID()

	frontendAttrs := map[string]string{}

	if opt.Options.Target != "" {
		frontendAttrs["target"] = opt.Options.Target
	}

	if opt.Options.Dockerfile != "" && opt.Options.Dockerfile != "." {
		frontendAttrs["filename"] = opt.Options.Dockerfile
	}

	if opt.Options.RemoteContext != "" {
		if opt.Options.RemoteContext != "client-session" {
			frontendAttrs["context"] = opt.Options.RemoteContext
		}
	} else {
		url, cancel := b.reqBodyHandler.newRequest(rc)
		defer cancel()
		frontendAttrs["context"] = url
	}

	cacheFrom := append([]string{}, opt.Options.CacheFrom...)

	frontendAttrs["cache-from"] = strings.Join(cacheFrom, ",")

	for k, v := range opt.Options.BuildArgs {
		if v == nil {
			continue
		}
		frontendAttrs["build-arg:"+k] = *v
	}

	for k, v := range opt.Options.Labels {
		frontendAttrs["label:"+k] = v
	}

	if opt.Options.NoCache {
		frontendAttrs["no-cache"] = ""
	}

	if opt.Options.PullParent {
		frontendAttrs["image-resolve-mode"] = "pull"
	} else {
		frontendAttrs["image-resolve-mode"] = "default"
	}

	if opt.Options.Platform != "" {
		// same as in newBuilder in builder/dockerfile.builder.go
		// TODO: remove once opt.Options.Platform is of type specs.Platform
		sp, err := platforms.Parse(opt.Options.Platform)
		if err != nil {
			return nil, err
		}
		if err := system.ValidatePlatform(sp); err != nil {
			return nil, err
		}
		frontendAttrs["platform"] = opt.Options.Platform
	}

	switch opt.Options.NetworkMode {
	case "host", "none":
		frontendAttrs["force-network-mode"] = opt.Options.NetworkMode
	case "", "default":
	default:
		return nil, errors.Errorf("network mode %q not supported by buildkit", opt.Options.NetworkMode)
	}

	extraHosts, err := toBuildkitExtraHosts(opt.Options.ExtraHosts)
	if err != nil {
		return nil, err
	}
	frontendAttrs["add-hosts"] = extraHosts

	exporterName := ""
	exporterAttrs := map[string]string{}

	if len(opt.Options.Outputs) > 1 {
		return nil, errors.Errorf("multiple outputs not supported")
	} else if len(opt.Options.Outputs) == 0 {
		exporterName = "moby"
	} else {
		// cacheonly is a special type for triggering skipping all exporters
		if opt.Options.Outputs[0].Type != "cacheonly" {
			exporterName = opt.Options.Outputs[0].Type
			exporterAttrs = opt.Options.Outputs[0].Attrs
		}
	}

	if exporterName == "moby" {
		if len(opt.Options.Tags) > 0 {
			exporterAttrs["name"] = strings.Join(opt.Options.Tags, ",")
		}
	}

	cache := controlapi.CacheOptions{}

	if inlineCache := opt.Options.BuildArgs["BUILDKIT_INLINE_CACHE"]; inlineCache != nil {
		if b, err := strconv.ParseBool(*inlineCache); err == nil && b {
			cache.Exports = append(cache.Exports, &controlapi.CacheOptionsEntry{
				Type: "inline",
			})
		}
	}

	req := &controlapi.SolveRequest{
		Ref:           id,
		Exporter:      exporterName,
		ExporterAttrs: exporterAttrs,
		Frontend:      "dockerfile.v0",
		FrontendAttrs: frontendAttrs,
		Session:       opt.Options.SessionID,
		Cache:         cache,
	}

	if opt.Options.NetworkMode == "host" {
		req.Entitlements = append(req.Entitlements, entitlements.EntitlementNetworkHost)
	}

	aux := streamformatter.AuxFormatter{Writer: opt.ProgressWriter.Output}

	eg, ctx := errgroup.WithContext(ctx)

	eg.Go(func() error {
		resp, err := b.controller.Solve(ctx, req)
		if err != nil {
			return err
		}
		if exporterName != "moby" {
			return nil
		}
		id, ok := resp.ExporterResponse["containerimage.digest"]
		if !ok {
			return errors.Errorf("missing image id")
		}
		out.ImageID = id
		return aux.Emit("moby.image.id", types.BuildResult{ID: id})
	})

	ch := make(chan *controlapi.StatusResponse)

	eg.Go(func() error {
		defer close(ch)
		// streamProxy.ctx is not set to ctx because when request is cancelled,
		// only the build request has to be cancelled, not the status request.
		stream := &statusProxy{streamProxy: streamProxy{ctx: context.TODO()}, ch: ch}
		return b.controller.Status(&controlapi.StatusRequest{Ref: id}, stream)
	})

	eg.Go(func() error {
		for sr := range ch {
			dt, err := sr.Marshal()
			if err != nil {
				return err
			}
			if err := aux.Emit("moby.buildkit.trace", dt); err != nil {
				return err
			}
		}
		return nil
	})

	if err := eg.Wait(); err != nil {
		return nil, err
	}

	return &out, nil
}
966060
func (b *Builder) Build() (*FileSorter, error) {
	// Sanity checks
	if b.sc == nil {
		return nil, errors.New("StatementContext is nil")
	}
	if b.keySize != len(b.byDesc) {
		return nil, errors.New("mismatch in key size and byDesc slice")
	}
	if b.keySize <= 0 {
		return nil, errors.New("key size is not positive")
	}
	if b.valSize <= 0 {
		return nil, errors.New("value size is not positive")
	}
	if b.bufSize <= 0 {
		return nil, errors.New("buffer size is not positive")
	}
	_, err := os.Stat(b.tmpDir)
	if err != nil {
		if os.IsNotExist(err) {
			return nil, errors.New("tmpDir does not exist")
		}
		return nil, errors.Trace(err)
	}

	rh := &rowHeap{sc: b.sc,
		ims:    make([]*item, 0),
		byDesc: b.byDesc,
	}

	return &FileSorter{sc: b.sc,
		keySize: b.keySize,
		valSize: b.valSize,
		bufSize: b.bufSize,
		buf:     make([]*comparableRow, 0, b.bufSize),
		files:   make([]string, 0),
		byDesc:  b.byDesc,
		rowHeap: rh,
		tmpDir:  b.tmpDir,
		fds:     make([]*os.File, 0),
	}, nil
}