cmd/multiproduct_kati/main.go - LeafOS-Project/android_build_soong - Gitiles

 // Copyright 2017 Google Inc. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 package main

 import (
 	"context"
 	"flag"
 	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
 	"strings"
 	"sync"
 	"syscall"
 	"time"

 	"android/soong/finder"
 	"android/soong/ui/build"
 	"android/soong/ui/logger"
 	"android/soong/ui/status"
 	"android/soong/ui/terminal"
 	"android/soong/ui/tracer"
 	"android/soong/zip"
 )

 var numJobs = flag.Int("j", 0, "number of parallel jobs [0=autodetect]")

 var keepArtifacts = flag.Bool("keep", false, "keep archives of artifacts")
 var incremental = flag.Bool("incremental", false, "run in incremental mode (saving intermediates)")

 var outDir = flag.String("out", "", "path to store output directories (defaults to tmpdir under $OUT when empty)")
 var alternateResultDir = flag.Bool("dist", false, "write select results to $DIST_DIR (or <out>/dist when empty)")

 var onlyConfig = flag.Bool("only-config", false, "Only run product config (not Soong or Kati)")
 var onlySoong = flag.Bool("only-soong", false, "Only run product config and Soong (not Kati)")

 var buildVariant = flag.String("variant", "eng", "build variant to use")

 var skipProducts = flag.String("skip-products", "", "comma-separated list of products to skip (known failures, etc)")
 var includeProducts = flag.String("products", "", "comma-separated list of products to build")

 var shardCount = flag.Int("shard-count", 1, "split the products into multiple shards (to spread the build onto multiple machines, etc)")
 var shard = flag.Int("shard", 1, "1-indexed shard to execute")

 const errorLeadingLines = 20
 const errorTrailingLines = 20

 func errMsgFromLog(filename string) string {
 	if filename == "" {
 		return ""
 	}

 	data, err := ioutil.ReadFile(filename)
 	if err != nil {
 		return ""
 	}

 	lines := strings.Split(strings.TrimSpace(string(data)), "\n")
 	if len(lines) > errorLeadingLines+errorTrailingLines+1 {
 		lines[errorLeadingLines] = fmt.Sprintf("... skipping %d lines ...",
 			len(lines)-errorLeadingLines-errorTrailingLines)

 		lines = append(lines[:errorLeadingLines+1],
 			lines[len(lines)-errorTrailingLines:]...)
 	}
 	var buf strings.Builder
 	for _, line := range lines {
 		buf.WriteString("> ")
 		buf.WriteString(line)
 		buf.WriteString("\n")
 	}
 	return buf.String()
 }

 // TODO(b/70370883): This tool uses a lot of open files -- over the default
 // soft limit of 1024 on some systems. So bump up to the hard limit until I fix
 // the algorithm.
 func setMaxFiles(log logger.Logger) {
 	var limits syscall.Rlimit

 	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limits)
 	if err != nil {
 		log.Println("Failed to get file limit:", err)
 		return
 	}

 	log.Verbosef("Current file limits: %d soft, %d hard", limits.Cur, limits.Max)
 	if limits.Cur == limits.Max {
 		return
 	}

 	limits.Cur = limits.Max
 	err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &limits)
 	if err != nil {
 		log.Println("Failed to increase file limit:", err)
 	}
 }

 func inList(str string, list []string) bool {
 	for _, other := range list {
 		if str == other {
 			return true
 		}
 	}
 	return false
 }

 func copyFile(from, to string) error {
 	fromFile, err := os.Open(from)
 	if err != nil {
 		return err
 	}
 	defer fromFile.Close()

 	toFile, err := os.Create(to)
 	if err != nil {
 		return err
 	}
 	defer toFile.Close()

 	_, err = io.Copy(toFile, fromFile)
 	return err
 }

 type mpContext struct {
 	Context context.Context
 	Logger  logger.Logger
 	Status  status.ToolStatus
 	Tracer  tracer.Tracer
 	Finder  *finder.Finder
 	Config  build.Config

 	LogsDir string
 }

 func main() {
 	stdio := terminal.StdioImpl{}

 	output := terminal.NewStatusOutput(stdio.Stdout(), "", false,
 		build.OsEnvironment().IsEnvTrue("ANDROID_QUIET_BUILD"))

 	log := logger.New(output)
 	defer log.Cleanup()

 	flag.Parse()

 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()

 	trace := tracer.New(log)
 	defer trace.Close()

 	stat := &status.Status{}
 	defer stat.Finish()
 	stat.AddOutput(output)

 	var failures failureCount
 	stat.AddOutput(&failures)

 	build.SetupSignals(log, cancel, func() {
 		trace.Close()
 		log.Cleanup()
 		stat.Finish()
 	})

 	buildCtx := build.Context{ContextImpl: &build.ContextImpl{
 		Context: ctx,
 		Logger:  log,
 		Tracer:  trace,
 		Writer:  output,
 		Status:  stat,
 	}}

 	config := build.NewConfig(buildCtx)
 	if *outDir == "" {
 		name := "multiproduct"
 		if !*incremental {
 			name += "-" + time.Now().Format("20060102150405")
 		}

 		*outDir = filepath.Join(config.OutDir(), name)

 		// Ensure the empty files exist in the output directory
 		// containing our output directory too. This is mostly for
 		// safety, but also triggers the ninja_build file so that our
 		// build servers know that they can parse the output as if it
 		// was ninja output.
 		build.SetupOutDir(buildCtx, config)

 		if err := os.MkdirAll(*outDir, 0777); err != nil {
 			log.Fatalf("Failed to create tempdir: %v", err)
 		}
 	}
 	config.Environment().Set("OUT_DIR", *outDir)
 	log.Println("Output directory:", *outDir)

 	logsDir := filepath.Join(config.OutDir(), "logs")
 	os.MkdirAll(logsDir, 0777)

 	build.SetupOutDir(buildCtx, config)
 	if *alternateResultDir {
 		distLogsDir := filepath.Join(config.DistDir(), "logs")
 		os.MkdirAll(distLogsDir, 0777)
 		log.SetOutput(filepath.Join(distLogsDir, "soong.log"))
 		trace.SetOutput(filepath.Join(distLogsDir, "build.trace"))
 	} else {
 		log.SetOutput(filepath.Join(config.OutDir(), "soong.log"))
 		trace.SetOutput(filepath.Join(config.OutDir(), "build.trace"))
 	}

 	var jobs = *numJobs
 	if jobs < 1 {
 		jobs = runtime.NumCPU() / 4

 		ramGb := int(config.TotalRAM() / 1024 / 1024 / 1024)
 		if ramJobs := ramGb / 20; ramGb > 0 && jobs > ramJobs {
 			jobs = ramJobs
 		}

 		if jobs < 1 {
 			jobs = 1
 		}
 	}
 	log.Verbosef("Using %d parallel jobs", jobs)

 	setMaxFiles(log)

 	finder := build.NewSourceFinder(buildCtx, config)
 	defer finder.Shutdown()

 	build.FindSources(buildCtx, config, finder)

 	vars, err := build.DumpMakeVars(buildCtx, config, nil, []string{"all_named_products"})
 	if err != nil {
 		log.Fatal(err)
 	}
 	var productsList []string
 	allProducts := strings.Fields(vars["all_named_products"])

 	if *includeProducts != "" {
 		missingProducts := []string{}
 		for _, product := range strings.Split(*includeProducts, ",") {
 			if inList(product, allProducts) {
 				productsList = append(productsList, product)
 			} else {
 				missingProducts = append(missingProducts, product)
 			}
 		}
 		if len(missingProducts) > 0 {
 			log.Fatalf("Products don't exist: %s\n", missingProducts)
 		}
 	} else {
 		productsList = allProducts
 	}

 	finalProductsList := make([]string, 0, len(productsList))
 	skipList := strings.Split(*skipProducts, ",")
 	skipProduct := func(p string) bool {
 		for _, s := range skipList {
 			if p == s {
 				return true
 			}
 		}
 		return false
 	}
 	for _, product := range productsList {
 		if !skipProduct(product) {
 			finalProductsList = append(finalProductsList, product)
 		} else {
 			log.Verbose("Skipping: ", product)
 		}
 	}

 	if *shard < 1 {
 		log.Fatalf("--shard value must be >= 1, not %d\n", *shard)
 	} else if *shardCount < 1 {
 		log.Fatalf("--shard-count value must be >= 1, not %d\n", *shardCount)
 	} else if *shard > *shardCount {
 		log.Fatalf("--shard (%d) must not be greater than --shard-count (%d)\n", *shard,
 			*shardCount)
 	} else if *shardCount > 1 {
 		finalProductsList = splitList(finalProductsList, *shardCount)[*shard-1]
 	}

 	log.Verbose("Got product list: ", finalProductsList)

 	s := buildCtx.Status.StartTool()
 	s.SetTotalActions(len(finalProductsList))

 	mpCtx := &mpContext{
 		Context: ctx,
 		Logger:  log,
 		Status:  s,
 		Tracer:  trace,

 		Finder: finder,
 		Config: config,

 		LogsDir: logsDir,
 	}

 	products := make(chan string, len(productsList))
 	go func() {
 		defer close(products)
 		for _, product := range finalProductsList {
 			products <- product
 		}
 	}()

 	var wg sync.WaitGroup
 	for i := 0; i < jobs; i++ {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
 			for {
 				select {
 				case product := <-products:
 					if product == "" {
 						return
 					}
 					buildProduct(mpCtx, product)
 				}
 			}
 		}()
 	}
 	wg.Wait()

 	if *alternateResultDir {
 		args := zip.ZipArgs{
 			FileArgs: []zip.FileArg{
 				{GlobDir: logsDir, SourcePrefixToStrip: logsDir},
 			},
 			OutputFilePath:   filepath.Join(config.DistDir(), "logs.zip"),
 			NumParallelJobs:  runtime.NumCPU(),
 			CompressionLevel: 5,
 		}
 		if err := zip.Zip(args); err != nil {
 			log.Fatalf("Error zipping logs: %v", err)
 		}
 	}

 	s.Finish()

 	if failures == 1 {
 		log.Fatal("1 failure")
 	} else if failures > 1 {
 		log.Fatalf("%d failures", failures)
 	} else {
 		fmt.Fprintln(output, "Success")
 	}
 }

 func buildProduct(mpctx *mpContext, product string) {
 	var stdLog string

 	outDir := filepath.Join(mpctx.Config.OutDir(), product)
 	logsDir := filepath.Join(mpctx.LogsDir, product)

 	if err := os.MkdirAll(outDir, 0777); err != nil {
 		mpctx.Logger.Fatalf("Error creating out directory: %v", err)
 	}
 	if err := os.MkdirAll(logsDir, 0777); err != nil {
 		mpctx.Logger.Fatalf("Error creating log directory: %v", err)
 	}

 	stdLog = filepath.Join(logsDir, "std.log")
 	f, err := os.Create(stdLog)
 	if err != nil {
 		mpctx.Logger.Fatalf("Error creating std.log: %v", err)
 	}
 	defer f.Close()

 	log := logger.New(f)
 	defer log.Cleanup()
 	log.SetOutput(filepath.Join(logsDir, "soong.log"))

 	action := &status.Action{
 		Description: product,
 		Outputs:     []string{product},
 	}
 	mpctx.Status.StartAction(action)
 	defer logger.Recover(func(err error) {
 		mpctx.Status.FinishAction(status.ActionResult{
 			Action: action,
 			Error:  err,
 			Output: errMsgFromLog(stdLog),
 		})
 	})

 	ctx := build.Context{ContextImpl: &build.ContextImpl{
 		Context: mpctx.Context,
 		Logger:  log,
 		Tracer:  mpctx.Tracer,
 		Writer:  f,
 		Thread:  mpctx.Tracer.NewThread(product),
 		Status:  &status.Status{},
 	}}
 	ctx.Status.AddOutput(terminal.NewStatusOutput(ctx.Writer, "", false,
 		build.OsEnvironment().IsEnvTrue("ANDROID_QUIET_BUILD")))

 	config := build.NewConfig(ctx, flag.Args()...)
 	config.Environment().Set("OUT_DIR", outDir)
 	if !*keepArtifacts {
 		config.Environment().Set("EMPTY_NINJA_FILE", "true")
 	}
 	build.FindSources(ctx, config, mpctx.Finder)
 	config.Lunch(ctx, product, *buildVariant)

 	defer func() {
 		if *keepArtifacts {
 			args := zip.ZipArgs{
 				FileArgs: []zip.FileArg{
 					{
 						GlobDir:             outDir,
 						SourcePrefixToStrip: outDir,
 					},
 				},
 				OutputFilePath:   filepath.Join(mpctx.Config.OutDir(), product+".zip"),
 				NumParallelJobs:  runtime.NumCPU(),
 				CompressionLevel: 5,
 			}
 			if err := zip.Zip(args); err != nil {
 				log.Fatalf("Error zipping artifacts: %v", err)
 			}
 		}
 		if !*incremental {
 			os.RemoveAll(outDir)
 		}
 	}()

 	buildWhat := build.BuildProductConfig
 	if !*onlyConfig {
 		buildWhat |= build.BuildSoong
 		if !*onlySoong {
 			buildWhat |= build.BuildKati
 		}
 	}

 	before := time.Now()
 	build.Build(ctx, config, buildWhat)

 	// Save std_full.log if Kati re-read the makefiles
 	if buildWhat&build.BuildKati != 0 {
 		if after, err := os.Stat(config.KatiBuildNinjaFile()); err == nil && after.ModTime().After(before) {
 			err := copyFile(stdLog, filepath.Join(filepath.Dir(stdLog), "std_full.log"))
 			if err != nil {
 				log.Fatalf("Error copying log file: %s", err)
 			}
 		}
 	}

 	mpctx.Status.FinishAction(status.ActionResult{
 		Action: action,
 	})
 }

 type failureCount int

 func (f *failureCount) StartAction(action *status.Action, counts status.Counts) {}

 func (f *failureCount) FinishAction(result status.ActionResult, counts status.Counts) {
 	if result.Error != nil {
 		*f += 1
 	}
 }

 func (f *failureCount) Message(level status.MsgLevel, message string) {
 	if level >= status.ErrorLvl {
 		*f += 1
 	}
 }

 func (f *failureCount) Flush() {}

 func (f *failureCount) Write(p []byte) (int, error) {
 	// discard writes
 	return len(p), nil
 }

 func splitList(list []string, shardCount int) (ret [][]string) {
 	each := len(list) / shardCount
 	extra := len(list) % shardCount
 	for i := 0; i < shardCount; i++ {
 		count := each
 		if extra > 0 {
 			count += 1
 			extra -= 1
 		}
 		ret = append(ret, list[:count])
 		list = list[count:]
 	}
 	return
 }
	// Copyright 2017 Google Inc. All rights reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	package main

	import (
	"context"
	"flag"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"sync"
	"syscall"
	"time"

	"android/soong/finder"
	"android/soong/ui/build"
	"android/soong/ui/logger"
	"android/soong/ui/status"
	"android/soong/ui/terminal"
	"android/soong/ui/tracer"
	"android/soong/zip"
	)

	var numJobs = flag.Int("j", 0, "number of parallel jobs [0=autodetect]")

	var keepArtifacts = flag.Bool("keep", false, "keep archives of artifacts")
	var incremental = flag.Bool("incremental", false, "run in incremental mode (saving intermediates)")

	var outDir = flag.String("out", "", "path to store output directories (defaults to tmpdir under $OUT when empty)")
	var alternateResultDir = flag.Bool("dist", false, "write select results to $DIST_DIR (or <out>/dist when empty)")

	var onlyConfig = flag.Bool("only-config", false, "Only run product config (not Soong or Kati)")
	var onlySoong = flag.Bool("only-soong", false, "Only run product config and Soong (not Kati)")

	var buildVariant = flag.String("variant", "eng", "build variant to use")

	var skipProducts = flag.String("skip-products", "", "comma-separated list of products to skip (known failures, etc)")
	var includeProducts = flag.String("products", "", "comma-separated list of products to build")

	var shardCount = flag.Int("shard-count", 1, "split the products into multiple shards (to spread the build onto multiple machines, etc)")
	var shard = flag.Int("shard", 1, "1-indexed shard to execute")

	const errorLeadingLines = 20
	const errorTrailingLines = 20

	func errMsgFromLog(filename string) string {
	if filename == "" {
	return ""
	}

	data, err := ioutil.ReadFile(filename)
	if err != nil {
	return ""
	}

	lines := strings.Split(strings.TrimSpace(string(data)), "\n")
	if len(lines) > errorLeadingLines+errorTrailingLines+1 {
	lines[errorLeadingLines] = fmt.Sprintf("... skipping %d lines ...",
	len(lines)-errorLeadingLines-errorTrailingLines)

	lines = append(lines[:errorLeadingLines+1],
	lines[len(lines)-errorTrailingLines:]...)
	}
	var buf strings.Builder
	for _, line := range lines {
	buf.WriteString("> ")
	buf.WriteString(line)
	buf.WriteString("\n")
	}
	return buf.String()
	}

	// TODO(b/70370883): This tool uses a lot of open files -- over the default
	// soft limit of 1024 on some systems. So bump up to the hard limit until I fix
	// the algorithm.
	func setMaxFiles(log logger.Logger) {
	var limits syscall.Rlimit

	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limits)
	if err != nil {
	log.Println("Failed to get file limit:", err)
	return
	}

	log.Verbosef("Current file limits: %d soft, %d hard", limits.Cur, limits.Max)
	if limits.Cur == limits.Max {
	return
	}

	limits.Cur = limits.Max
	err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &limits)
	if err != nil {
	log.Println("Failed to increase file limit:", err)
	}
	}

	func inList(str string, list []string) bool {
	for _, other := range list {
	if str == other {
	return true
	}
	}
	return false
	}

	func copyFile(from, to string) error {
	fromFile, err := os.Open(from)
	if err != nil {
	return err
	}
	defer fromFile.Close()

	toFile, err := os.Create(to)
	if err != nil {
	return err
	}
	defer toFile.Close()

	_, err = io.Copy(toFile, fromFile)
	return err
	}

	type mpContext struct {
	Context context.Context
	Logger logger.Logger
	Status status.ToolStatus
	Tracer tracer.Tracer
	Finder *finder.Finder
	Config build.Config

	LogsDir string
	}

	func main() {
	stdio := terminal.StdioImpl{}

	output := terminal.NewStatusOutput(stdio.Stdout(), "", false,
	build.OsEnvironment().IsEnvTrue("ANDROID_QUIET_BUILD"))

	log := logger.New(output)
	defer log.Cleanup()

	flag.Parse()

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	trace := tracer.New(log)
	defer trace.Close()

	stat := &status.Status{}
	defer stat.Finish()
	stat.AddOutput(output)

	var failures failureCount
	stat.AddOutput(&failures)

	build.SetupSignals(log, cancel, func() {
	trace.Close()
	log.Cleanup()
	stat.Finish()
	})

	buildCtx := build.Context{ContextImpl: &build.ContextImpl{
	Context: ctx,
	Logger: log,
	Tracer: trace,
	Writer: output,
	Status: stat,
	}}

	config := build.NewConfig(buildCtx)
	if *outDir == "" {
	name := "multiproduct"
	if !*incremental {
	name += "-" + time.Now().Format("20060102150405")
	}

	*outDir = filepath.Join(config.OutDir(), name)

	// Ensure the empty files exist in the output directory
	// containing our output directory too. This is mostly for
	// safety, but also triggers the ninja_build file so that our
	// build servers know that they can parse the output as if it
	// was ninja output.
	build.SetupOutDir(buildCtx, config)

	if err := os.MkdirAll(*outDir, 0777); err != nil {
	log.Fatalf("Failed to create tempdir: %v", err)
	}
	}
	config.Environment().Set("OUT_DIR", *outDir)
	log.Println("Output directory:", *outDir)

	logsDir := filepath.Join(config.OutDir(), "logs")
	os.MkdirAll(logsDir, 0777)

	build.SetupOutDir(buildCtx, config)
	if *alternateResultDir {
	distLogsDir := filepath.Join(config.DistDir(), "logs")
	os.MkdirAll(distLogsDir, 0777)
	log.SetOutput(filepath.Join(distLogsDir, "soong.log"))
	trace.SetOutput(filepath.Join(distLogsDir, "build.trace"))
	} else {
	log.SetOutput(filepath.Join(config.OutDir(), "soong.log"))
	trace.SetOutput(filepath.Join(config.OutDir(), "build.trace"))
	}

	var jobs = *numJobs
	if jobs < 1 {
	jobs = runtime.NumCPU() / 4

	ramGb := int(config.TotalRAM() / 1024 / 1024 / 1024)
	if ramJobs := ramGb / 20; ramGb > 0 && jobs > ramJobs {
	jobs = ramJobs
	}

	if jobs < 1 {
	jobs = 1
	}
	}
	log.Verbosef("Using %d parallel jobs", jobs)

	setMaxFiles(log)

	finder := build.NewSourceFinder(buildCtx, config)
	defer finder.Shutdown()

	build.FindSources(buildCtx, config, finder)

	vars, err := build.DumpMakeVars(buildCtx, config, nil, []string{"all_named_products"})
	if err != nil {
	log.Fatal(err)
	}
	var productsList []string
	allProducts := strings.Fields(vars["all_named_products"])

	if *includeProducts != "" {
	missingProducts := []string{}
	for _, product := range strings.Split(*includeProducts, ",") {
	if inList(product, allProducts) {
	productsList = append(productsList, product)
	} else {
	missingProducts = append(missingProducts, product)
	}
	}
	if len(missingProducts) > 0 {
	log.Fatalf("Products don't exist: %s\n", missingProducts)
	}
	} else {
	productsList = allProducts
	}

	finalProductsList := make([]string, 0, len(productsList))
	skipList := strings.Split(*skipProducts, ",")
	skipProduct := func(p string) bool {
	for _, s := range skipList {
	if p == s {
	return true
	}
	}
	return false
	}
	for _, product := range productsList {
	if !skipProduct(product) {
	finalProductsList = append(finalProductsList, product)
	} else {
	log.Verbose("Skipping: ", product)
	}
	}

	if *shard < 1 {
	log.Fatalf("--shard value must be >= 1, not %d\n", *shard)
	} else if *shardCount < 1 {
	log.Fatalf("--shard-count value must be >= 1, not %d\n", *shardCount)
	} else if shard > shardCount {
	log.Fatalf("--shard (%d) must not be greater than --shard-count (%d)\n", *shard,
	*shardCount)
	} else if *shardCount > 1 {
	finalProductsList = splitList(finalProductsList, shardCount)[shard-1]
	}

	log.Verbose("Got product list: ", finalProductsList)

	s := buildCtx.Status.StartTool()
	s.SetTotalActions(len(finalProductsList))

	mpCtx := &mpContext{
	Context: ctx,
	Logger: log,
	Status: s,
	Tracer: trace,

	Finder: finder,
	Config: config,

	LogsDir: logsDir,
	}

	products := make(chan string, len(productsList))
	go func() {
	defer close(products)
	for _, product := range finalProductsList {
	products <- product
	}
	}()

	var wg sync.WaitGroup
	for i := 0; i < jobs; i++ {
	wg.Add(1)
	go func() {
	defer wg.Done()
	for {
	select {
	case product := <-products:
	if product == "" {
	return
	}
	buildProduct(mpCtx, product)
	}
	}
	}()
	}
	wg.Wait()

	if *alternateResultDir {
	args := zip.ZipArgs{
	FileArgs: []zip.FileArg{
	{GlobDir: logsDir, SourcePrefixToStrip: logsDir},
	},
	OutputFilePath: filepath.Join(config.DistDir(), "logs.zip"),
	NumParallelJobs: runtime.NumCPU(),
	CompressionLevel: 5,
	}
	if err := zip.Zip(args); err != nil {
	log.Fatalf("Error zipping logs: %v", err)
	}
	}

	s.Finish()

	if failures == 1 {
	log.Fatal("1 failure")
	} else if failures > 1 {
	log.Fatalf("%d failures", failures)
	} else {
	fmt.Fprintln(output, "Success")
	}
	}

	func buildProduct(mpctx *mpContext, product string) {
	var stdLog string

	outDir := filepath.Join(mpctx.Config.OutDir(), product)
	logsDir := filepath.Join(mpctx.LogsDir, product)

	if err := os.MkdirAll(outDir, 0777); err != nil {
	mpctx.Logger.Fatalf("Error creating out directory: %v", err)
	}
	if err := os.MkdirAll(logsDir, 0777); err != nil {
	mpctx.Logger.Fatalf("Error creating log directory: %v", err)
	}

	stdLog = filepath.Join(logsDir, "std.log")
	f, err := os.Create(stdLog)
	if err != nil {
	mpctx.Logger.Fatalf("Error creating std.log: %v", err)
	}
	defer f.Close()

	log := logger.New(f)
	defer log.Cleanup()
	log.SetOutput(filepath.Join(logsDir, "soong.log"))

	action := &status.Action{
	Description: product,
	Outputs: []string{product},
	}
	mpctx.Status.StartAction(action)
	defer logger.Recover(func(err error) {
	mpctx.Status.FinishAction(status.ActionResult{
	Action: action,
	Error: err,
	Output: errMsgFromLog(stdLog),
	})
	})

	ctx := build.Context{ContextImpl: &build.ContextImpl{
	Context: mpctx.Context,
	Logger: log,
	Tracer: mpctx.Tracer,
	Writer: f,
	Thread: mpctx.Tracer.NewThread(product),
	Status: &status.Status{},
	}}
	ctx.Status.AddOutput(terminal.NewStatusOutput(ctx.Writer, "", false,
	build.OsEnvironment().IsEnvTrue("ANDROID_QUIET_BUILD")))

	config := build.NewConfig(ctx, flag.Args()...)
	config.Environment().Set("OUT_DIR", outDir)
	if !*keepArtifacts {
	config.Environment().Set("EMPTY_NINJA_FILE", "true")
	}
	build.FindSources(ctx, config, mpctx.Finder)
	config.Lunch(ctx, product, *buildVariant)

	defer func() {
	if *keepArtifacts {
	args := zip.ZipArgs{
	FileArgs: []zip.FileArg{
	{
	GlobDir: outDir,
	SourcePrefixToStrip: outDir,
	},
	},
	OutputFilePath: filepath.Join(mpctx.Config.OutDir(), product+".zip"),
	NumParallelJobs: runtime.NumCPU(),
	CompressionLevel: 5,
	}
	if err := zip.Zip(args); err != nil {
	log.Fatalf("Error zipping artifacts: %v", err)
	}
	}
	if !*incremental {
	os.RemoveAll(outDir)
	}
	}()

	buildWhat := build.BuildProductConfig
	if !*onlyConfig {
	buildWhat \|= build.BuildSoong
	if !*onlySoong {
	buildWhat \|= build.BuildKati
	}
	}

	before := time.Now()
	build.Build(ctx, config, buildWhat)

	// Save std_full.log if Kati re-read the makefiles
	if buildWhat&build.BuildKati != 0 {
	if after, err := os.Stat(config.KatiBuildNinjaFile()); err == nil && after.ModTime().After(before) {
	err := copyFile(stdLog, filepath.Join(filepath.Dir(stdLog), "std_full.log"))
	if err != nil {
	log.Fatalf("Error copying log file: %s", err)
	}
	}
	}

	mpctx.Status.FinishAction(status.ActionResult{
	Action: action,
	})
	}

	type failureCount int

	func (f failureCount) StartAction(action status.Action, counts status.Counts) {}

	func (f *failureCount) FinishAction(result status.ActionResult, counts status.Counts) {
	if result.Error != nil {
	*f += 1
	}
	}

	func (f *failureCount) Message(level status.MsgLevel, message string) {
	if level >= status.ErrorLvl {
	*f += 1
	}
	}

	func (f *failureCount) Flush() {}

	func (f *failureCount) Write(p []byte) (int, error) {
	// discard writes
	return len(p), nil
	}

	func splitList(list []string, shardCount int) (ret [][]string) {
	each := len(list) / shardCount
	extra := len(list) % shardCount
	for i := 0; i < shardCount; i++ {
	count := each
	if extra > 0 {
	count += 1
	extra -= 1
	}
	ret = append(ret, list[:count])
	list = list[count:]
	}
	return
	}