Examples with AsyncCloseable com.facebook.buck.util.AsyncCloseable used on opensource projects

Example 1 with AsyncCloseable

use of com.facebook.buck.util.AsyncCloseable in project buck by facebook.

the class Main method runMainWithExitCode.

/**
   * @param buildId an identifier for this command execution.
   * @param context an optional NGContext that is present if running inside a Nailgun server.
   * @param initTimestamp Value of System.nanoTime() when process got main()/nailMain() invoked.
   * @param unexpandedCommandLineArgs command line arguments
   * @return an exit code or {@code null} if this is a process that should not exit
   */
@SuppressWarnings("PMD.PrematureDeclaration")
public int runMainWithExitCode(BuildId buildId, Path projectRoot, Optional<NGContext> context, ImmutableMap<String, String> clientEnvironment, CommandMode commandMode, WatchmanWatcher.FreshInstanceAction watchmanFreshInstanceAction, final long initTimestamp, String... unexpandedCommandLineArgs) throws IOException, InterruptedException {
    String[] args = BuckArgsMethods.expandAtFiles(unexpandedCommandLineArgs);
    // Parse the command line args.
    BuckCommand command = new BuckCommand();
    AdditionalOptionsCmdLineParser cmdLineParser = new AdditionalOptionsCmdLineParser(command);
    try {
        cmdLineParser.parseArgument(args);
    } catch (CmdLineException e) {
        // Can't go through the console for prettification since that needs the BuckConfig, and that
        // needs to be created with the overrides, which are parsed from the command line here, which
        // required the console to print the message that parsing has failed. So just write to stderr
        // and be done with it.
        stdErr.println(e.getLocalizedMessage());
        stdErr.println("For help see 'buck --help'.");
        return 1;
    }
    {
        // Return help strings fast if the command is a help request.
        OptionalInt result = command.runHelp(stdErr);
        if (result.isPresent()) {
            return result.getAsInt();
        }
    }
    // Setup logging.
    if (commandMode.isLoggingEnabled()) {
        // Reset logging each time we run a command while daemonized.
        // This will cause us to write a new log per command.
        LOG.debug("Rotating log.");
        LogConfig.flushLogs();
        LogConfig.setupLogging(command.getLogConfig());
        if (LOG.isDebugEnabled()) {
            Long gitCommitTimestamp = Long.getLong("buck.git_commit_timestamp");
            String buildDateStr;
            if (gitCommitTimestamp == null) {
                buildDateStr = "(unknown)";
            } else {
                buildDateStr = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z", Locale.US).format(new Date(TimeUnit.SECONDS.toMillis(gitCommitTimestamp)));
            }
            String buildRev = System.getProperty("buck.git_commit", "(unknown)");
            LOG.debug("Starting up (build date %s, rev %s), args: %s", buildDateStr, buildRev, Arrays.toString(args));
            LOG.debug("System properties: %s", System.getProperties());
        }
    }
    // Setup filesystem and buck config.
    Path canonicalRootPath = projectRoot.toRealPath().normalize();
    Config config = Configs.createDefaultConfig(canonicalRootPath, command.getConfigOverrides().getForCell(RelativeCellName.ROOT_CELL_NAME));
    ProjectFilesystem filesystem = new ProjectFilesystem(canonicalRootPath, config);
    DefaultCellPathResolver cellPathResolver = new DefaultCellPathResolver(filesystem.getRootPath(), config);
    BuckConfig buckConfig = new BuckConfig(config, filesystem, architecture, platform, clientEnvironment, cellPathResolver);
    ImmutableSet<Path> projectWatchList = ImmutableSet.<Path>builder().add(canonicalRootPath).addAll(buckConfig.getView(ParserConfig.class).getWatchCells() ? cellPathResolver.getTransitivePathMapping().values() : ImmutableList.of()).build();
    Optional<ImmutableList<String>> allowedJavaSpecificiationVersions = buckConfig.getAllowedJavaSpecificationVersions();
    if (allowedJavaSpecificiationVersions.isPresent()) {
        String specificationVersion = System.getProperty("java.specification.version");
        boolean javaSpecificationVersionIsAllowed = allowedJavaSpecificiationVersions.get().contains(specificationVersion);
        if (!javaSpecificationVersionIsAllowed) {
            throw new HumanReadableException("Current Java version '%s' is not in the allowed java specification versions:\n%s", specificationVersion, Joiner.on(", ").join(allowedJavaSpecificiationVersions.get()));
        }
    }
    // Setup the console.
    Verbosity verbosity = VerbosityParser.parse(args);
    Optional<String> color;
    if (context.isPresent() && (context.get().getEnv() != null)) {
        String colorString = context.get().getEnv().getProperty(BUCKD_COLOR_DEFAULT_ENV_VAR);
        color = Optional.ofNullable(colorString);
    } else {
        color = Optional.empty();
    }
    final Console console = new Console(verbosity, stdOut, stdErr, buckConfig.createAnsi(color));
    // No more early outs: if this command is not read only, acquire the command semaphore to
    // become the only executing read/write command.
    // This must happen immediately before the try block to ensure that the semaphore is released.
    boolean commandSemaphoreAcquired = false;
    boolean shouldCleanUpTrash = false;
    if (!command.isReadOnly()) {
        commandSemaphoreAcquired = commandSemaphore.tryAcquire();
        if (!commandSemaphoreAcquired) {
            LOG.warn("Buck server was busy executing a command. Maybe retrying later will help.");
            return BUSY_EXIT_CODE;
        }
    }
    try {
        if (commandSemaphoreAcquired) {
            commandSemaphoreNgClient = context;
        }
        if (!command.isReadOnly()) {
            Optional<String> currentVersion = filesystem.readFileIfItExists(filesystem.getBuckPaths().getCurrentVersionFile());
            BuckPaths unconfiguredPaths = filesystem.getBuckPaths().withConfiguredBuckOut(filesystem.getBuckPaths().getBuckOut());
            if (!currentVersion.isPresent() || !currentVersion.get().equals(BuckVersion.getVersion()) || (filesystem.exists(unconfiguredPaths.getGenDir(), LinkOption.NOFOLLOW_LINKS) && (filesystem.isSymLink(unconfiguredPaths.getGenDir()) ^ buckConfig.getBuckOutCompatLink()))) {
                // Migrate any version-dependent directories (which might be huge) to a trash directory
                // so we can delete it asynchronously after the command is done.
                moveToTrash(filesystem, console, buildId, filesystem.getBuckPaths().getAnnotationDir(), filesystem.getBuckPaths().getGenDir(), filesystem.getBuckPaths().getScratchDir(), filesystem.getBuckPaths().getResDir());
                shouldCleanUpTrash = true;
                filesystem.mkdirs(filesystem.getBuckPaths().getCurrentVersionFile().getParent());
                filesystem.writeContentsToPath(BuckVersion.getVersion(), filesystem.getBuckPaths().getCurrentVersionFile());
            }
        }
        AndroidBuckConfig androidBuckConfig = new AndroidBuckConfig(buckConfig, platform);
        AndroidDirectoryResolver androidDirectoryResolver = new DefaultAndroidDirectoryResolver(filesystem.getRootPath().getFileSystem(), clientEnvironment, androidBuckConfig.getBuildToolsVersion(), androidBuckConfig.getNdkVersion());
        ProcessExecutor processExecutor = new DefaultProcessExecutor(console);
        Clock clock;
        boolean enableThreadCpuTime = buckConfig.getBooleanValue("build", "enable_thread_cpu_time", true);
        if (BUCKD_LAUNCH_TIME_NANOS.isPresent()) {
            long nanosEpoch = Long.parseLong(BUCKD_LAUNCH_TIME_NANOS.get(), 10);
            LOG.verbose("Using nanos epoch: %d", nanosEpoch);
            clock = new NanosAdjustedClock(nanosEpoch, enableThreadCpuTime);
        } else {
            clock = new DefaultClock(enableThreadCpuTime);
        }
        ParserConfig parserConfig = buckConfig.getView(ParserConfig.class);
        try (Watchman watchman = buildWatchman(context, parserConfig, projectWatchList, clientEnvironment, console, clock)) {
            final boolean isDaemon = context.isPresent() && (watchman != Watchman.NULL_WATCHMAN);
            if (!isDaemon && shouldCleanUpTrash) {
                // Clean up the trash on a background thread if this was a
                // non-buckd read-write command. (We don't bother waiting
                // for it to complete; the thread is a daemon thread which
                // will just be terminated at shutdown time.)
                TRASH_CLEANER.startCleaningDirectory(filesystem.getBuckPaths().getTrashDir());
            }
            KnownBuildRuleTypesFactory factory = new KnownBuildRuleTypesFactory(processExecutor, androidDirectoryResolver);
            Cell rootCell = CellProvider.createForLocalBuild(filesystem, watchman, buckConfig, command.getConfigOverrides(), factory).getCellByPath(filesystem.getRootPath());
            int exitCode;
            ImmutableList<BuckEventListener> eventListeners = ImmutableList.of();
            ExecutionEnvironment executionEnvironment = new DefaultExecutionEnvironment(clientEnvironment, System.getProperties());
            ImmutableList.Builder<ProjectFileHashCache> allCaches = ImmutableList.builder();
            // Build up the hash cache, which is a collection of the stateful cell cache and some
            // per-run caches.
            //
            // TODO(Coneko, ruibm, andrewjcg): Determine whether we can use the existing filesystem
            // object that is in scope instead of creating a new rootCellProjectFilesystem. The primary
            // difference appears to be that filesystem is created with a Config that is used to produce
            // ImmutableSet<PathOrGlobMatcher> and BuckPaths for the ProjectFilesystem, whereas this one
            // uses the defaults.
            ProjectFilesystem rootCellProjectFilesystem = ProjectFilesystem.createNewOrThrowHumanReadableException(rootCell.getFilesystem().getRootPath());
            if (isDaemon) {
                allCaches.addAll(getFileHashCachesFromDaemon(rootCell));
            } else {
                getTransitiveCells(rootCell).stream().map(cell -> DefaultFileHashCache.createDefaultFileHashCache(cell.getFilesystem())).forEach(allCaches::add);
                allCaches.add(DefaultFileHashCache.createBuckOutFileHashCache(rootCellProjectFilesystem, rootCell.getFilesystem().getBuckPaths().getBuckOut()));
            }
            // A cache which caches hashes of cell-relative paths which may have been ignore by
            // the main cell cache, and only serves to prevent rehashing the same file multiple
            // times in a single run.
            allCaches.add(DefaultFileHashCache.createDefaultFileHashCache(rootCellProjectFilesystem));
            allCaches.addAll(DefaultFileHashCache.createOsRootDirectoriesCaches());
            StackedFileHashCache fileHashCache = new StackedFileHashCache(allCaches.build());
            Optional<WebServer> webServer = getWebServerIfDaemon(context, rootCell);
            Optional<ConcurrentMap<String, WorkerProcessPool>> persistentWorkerPools = getPersistentWorkerPoolsIfDaemon(context, rootCell);
            TestConfig testConfig = new TestConfig(buckConfig);
            ArtifactCacheBuckConfig cacheBuckConfig = new ArtifactCacheBuckConfig(buckConfig);
            ExecutorService diskIoExecutorService = MostExecutors.newSingleThreadExecutor("Disk I/O");
            ListeningExecutorService httpWriteExecutorService = getHttpWriteExecutorService(cacheBuckConfig);
            ScheduledExecutorService counterAggregatorExecutor = Executors.newSingleThreadScheduledExecutor(new CommandThreadFactory("CounterAggregatorThread"));
            VersionControlStatsGenerator vcStatsGenerator;
            // Eventually, we'll want to get allow websocket and/or nailgun clients to specify locale
            // when connecting. For now, we'll use the default from the server environment.
            Locale locale = Locale.getDefault();
            // Create a cached thread pool for cpu intensive tasks
            Map<ExecutorPool, ListeningExecutorService> executors = new HashMap<>();
            executors.put(ExecutorPool.CPU, listeningDecorator(Executors.newCachedThreadPool()));
            // Create a thread pool for network I/O tasks
            executors.put(ExecutorPool.NETWORK, newDirectExecutorService());
            executors.put(ExecutorPool.PROJECT, listeningDecorator(MostExecutors.newMultiThreadExecutor("Project", buckConfig.getNumThreads())));
            // Create and register the event buses that should listen to broadcast events.
            // If the build doesn't have a daemon create a new instance.
            BroadcastEventListener broadcastEventListener = getBroadcastEventListener(isDaemon, rootCell, objectMapper);
            // The order of resources in the try-with-resources block is important: the BuckEventBus
            // must be the last resource, so that it is closed first and can deliver its queued events
            // to the other resources before they are closed.
            InvocationInfo invocationInfo = InvocationInfo.of(buildId, isSuperConsoleEnabled(console), isDaemon, command.getSubCommandNameForLogging(), filesystem.getBuckPaths().getLogDir());
            try (GlobalStateManager.LoggerIsMappedToThreadScope loggerThreadMappingScope = GlobalStateManager.singleton().setupLoggers(invocationInfo, console.getStdErr(), stdErr, verbosity);
                AbstractConsoleEventBusListener consoleListener = createConsoleEventListener(clock, new SuperConsoleConfig(buckConfig), console, testConfig.getResultSummaryVerbosity(), executionEnvironment, webServer, locale, filesystem.getBuckPaths().getLogDir().resolve("test.log"));
                AsyncCloseable asyncCloseable = new AsyncCloseable(diskIoExecutorService);
                BuckEventBus buildEventBus = new BuckEventBus(clock, buildId);
                BroadcastEventListener.BroadcastEventBusClosable broadcastEventBusClosable = broadcastEventListener.addEventBus(buildEventBus);
                // stderr.
                Closeable logErrorToEventBus = loggerThreadMappingScope.setWriter(createWriterForConsole(consoleListener));
                // NOTE: This will only run during the lifetime of the process and will flush on close.
                CounterRegistry counterRegistry = new CounterRegistryImpl(counterAggregatorExecutor, buildEventBus, buckConfig.getCountersFirstFlushIntervalMillis(), buckConfig.getCountersFlushIntervalMillis());
                PerfStatsTracking perfStatsTracking = new PerfStatsTracking(buildEventBus, invocationInfo);
                ProcessTracker processTracker = buckConfig.isProcessTrackerEnabled() && platform != Platform.WINDOWS ? new ProcessTracker(buildEventBus, invocationInfo, isDaemon, buckConfig.isProcessTrackerDeepEnabled()) : null) {
                LOG.debug(invocationInfo.toLogLine(args));
                buildEventBus.register(HANG_MONITOR.getHangMonitor());
                ArtifactCaches artifactCacheFactory = new ArtifactCaches(cacheBuckConfig, buildEventBus, filesystem, executionEnvironment.getWifiSsid(), httpWriteExecutorService, Optional.of(asyncCloseable));
                ProgressEstimator progressEstimator = new ProgressEstimator(filesystem.resolve(filesystem.getBuckPaths().getBuckOut()).resolve(ProgressEstimator.PROGRESS_ESTIMATIONS_JSON), buildEventBus, objectMapper);
                consoleListener.setProgressEstimator(progressEstimator);
                BuildEnvironmentDescription buildEnvironmentDescription = getBuildEnvironmentDescription(executionEnvironment, buckConfig);
                Iterable<BuckEventListener> commandEventListeners = command.getSubcommand().isPresent() ? command.getSubcommand().get().getEventListeners(invocationInfo.getLogDirectoryPath(), filesystem) : ImmutableList.of();
                Supplier<BuckEventListener> missingSymbolsListenerSupplier = () -> {
                    return MissingSymbolsHandler.createListener(rootCell.getFilesystem(), rootCell.getKnownBuildRuleTypes().getAllDescriptions(), rootCell.getBuckConfig(), buildEventBus, console, buckConfig.getView(JavaBuckConfig.class).getDefaultJavacOptions(), clientEnvironment);
                };
                eventListeners = addEventListeners(buildEventBus, rootCell.getFilesystem(), invocationInfo, rootCell.getBuckConfig(), webServer, clock, consoleListener, missingSymbolsListenerSupplier, counterRegistry, commandEventListeners);
                if (commandMode == CommandMode.RELEASE && buckConfig.isPublicAnnouncementsEnabled()) {
                    PublicAnnouncementManager announcementManager = new PublicAnnouncementManager(clock, buildEventBus, consoleListener, buckConfig.getRepository().orElse("unknown"), new RemoteLogBuckConfig(buckConfig), executors.get(ExecutorPool.CPU));
                    announcementManager.getAndPostAnnouncements();
                }
                // This needs to be after the registration of the event listener so they can pick it up.
                if (watchmanFreshInstanceAction == WatchmanWatcher.FreshInstanceAction.NONE) {
                    buildEventBus.post(DaemonEvent.newDaemonInstance());
                }
                if (command.subcommand instanceof AbstractCommand) {
                    AbstractCommand subcommand = (AbstractCommand) command.subcommand;
                    VersionControlBuckConfig vcBuckConfig = new VersionControlBuckConfig(buckConfig);
                    if (!commandMode.equals(CommandMode.TEST) && (subcommand.isSourceControlStatsGatheringEnabled() || vcBuckConfig.shouldGenerateStatistics())) {
                        vcStatsGenerator = new VersionControlStatsGenerator(diskIoExecutorService, new DefaultVersionControlCmdLineInterfaceFactory(rootCell.getFilesystem().getRootPath(), new PrintStreamProcessExecutorFactory(), vcBuckConfig, buckConfig.getEnvironment()), buildEventBus);
                        vcStatsGenerator.generateStatsAsync();
                    }
                }
                ImmutableList<String> remainingArgs = args.length > 1 ? ImmutableList.copyOf(Arrays.copyOfRange(args, 1, args.length)) : ImmutableList.of();
                CommandEvent.Started startedEvent = CommandEvent.started(args.length > 0 ? args[0] : "", remainingArgs, isDaemon, getBuckPID());
                buildEventBus.post(startedEvent);
                // Create or get Parser and invalidate cached command parameters.
                Parser parser = null;
                VersionedTargetGraphCache versionedTargetGraphCache = null;
                ActionGraphCache actionGraphCache = null;
                Optional<RuleKeyCacheRecycler<RuleKey>> defaultRuleKeyFactoryCacheRecycler = Optional.empty();
                if (isDaemon) {
                    try {
                        Daemon daemon = getDaemon(rootCell, objectMapper);
                        WatchmanWatcher watchmanWatcher = createWatchmanWatcher(daemon, watchman.getProjectWatches(), daemon.getFileEventBus(), ImmutableSet.<PathOrGlobMatcher>builder().addAll(filesystem.getIgnorePaths()).addAll(DEFAULT_IGNORE_GLOBS).build(), watchman);
                        parser = getParserFromDaemon(context, rootCell, startedEvent, buildEventBus, watchmanWatcher, watchmanFreshInstanceAction);
                        versionedTargetGraphCache = daemon.getVersionedTargetGraphCache();
                        actionGraphCache = daemon.getActionGraphCache();
                        if (buckConfig.getRuleKeyCaching()) {
                            LOG.debug("Using rule key calculation caching");
                            defaultRuleKeyFactoryCacheRecycler = Optional.of(daemon.getDefaultRuleKeyFactoryCacheRecycler());
                        }
                    } catch (WatchmanWatcherException | IOException e) {
                        buildEventBus.post(ConsoleEvent.warning("Watchman threw an exception while parsing file changes.\n%s", e.getMessage()));
                    }
                }
                if (versionedTargetGraphCache == null) {
                    versionedTargetGraphCache = new VersionedTargetGraphCache();
                }
                if (actionGraphCache == null) {
                    actionGraphCache = new ActionGraphCache(broadcastEventListener);
                }
                if (parser == null) {
                    TypeCoercerFactory typeCoercerFactory = new DefaultTypeCoercerFactory(objectMapper);
                    parser = new Parser(broadcastEventListener, rootCell.getBuckConfig().getView(ParserConfig.class), typeCoercerFactory, new ConstructorArgMarshaller(typeCoercerFactory));
                }
                // Because the Parser is potentially constructed before the CounterRegistry,
                // we need to manually register its counters after it's created.
                //
                // The counters will be unregistered once the counter registry is closed.
                counterRegistry.registerCounters(parser.getCounters());
                JavaUtilsLoggingBuildListener.ensureLogFileIsWritten(rootCell.getFilesystem());
                Optional<ProcessManager> processManager;
                if (platform == Platform.WINDOWS) {
                    processManager = Optional.empty();
                } else {
                    processManager = Optional.of(new PkillProcessManager(processExecutor));
                }
                Supplier<AndroidPlatformTarget> androidPlatformTargetSupplier = createAndroidPlatformTargetSupplier(androidDirectoryResolver, androidBuckConfig, buildEventBus);
                // event-listener.
                if (command.subcommand instanceof AbstractCommand) {
                    AbstractCommand subcommand = (AbstractCommand) command.subcommand;
                    Optional<Path> eventsOutputPath = subcommand.getEventsOutputPath();
                    if (eventsOutputPath.isPresent()) {
                        BuckEventListener listener = new FileSerializationEventBusListener(eventsOutputPath.get(), objectMapper);
                        buildEventBus.register(listener);
                    }
                }
                buildEventBus.post(new BuckInitializationDurationEvent(TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - initTimestamp)));
                try {
                    exitCode = command.run(CommandRunnerParams.builder().setConsole(console).setStdIn(stdIn).setCell(rootCell).setAndroidPlatformTargetSupplier(androidPlatformTargetSupplier).setArtifactCacheFactory(artifactCacheFactory).setBuckEventBus(buildEventBus).setParser(parser).setPlatform(platform).setEnvironment(clientEnvironment).setJavaPackageFinder(rootCell.getBuckConfig().getView(JavaBuckConfig.class).createDefaultJavaPackageFinder()).setObjectMapper(objectMapper).setClock(clock).setProcessManager(processManager).setPersistentWorkerPools(persistentWorkerPools).setWebServer(webServer).setBuckConfig(buckConfig).setFileHashCache(fileHashCache).setExecutors(executors).setBuildEnvironmentDescription(buildEnvironmentDescription).setVersionedTargetGraphCache(versionedTargetGraphCache).setActionGraphCache(actionGraphCache).setKnownBuildRuleTypesFactory(factory).setInvocationInfo(Optional.of(invocationInfo)).setDefaultRuleKeyFactoryCacheRecycler(defaultRuleKeyFactoryCacheRecycler).build());
                } catch (InterruptedException | ClosedByInterruptException e) {
                    exitCode = INTERRUPTED_EXIT_CODE;
                    buildEventBus.post(CommandEvent.interrupted(startedEvent, INTERRUPTED_EXIT_CODE));
                    throw e;
                }
                // Let's avoid an infinite loop
                if (exitCode == BUSY_EXIT_CODE) {
                    // Some loss of info here, but better than looping
                    exitCode = FAIL_EXIT_CODE;
                    LOG.error("Buck return with exit code %d which we use to indicate busy status. " + "This is probably propagating an exit code from a sub process or tool. " + "Coercing to %d to avoid retries.", BUSY_EXIT_CODE, FAIL_EXIT_CODE);
                }
                // Wait for HTTP writes to complete.
                closeHttpExecutorService(cacheBuckConfig, Optional.of(buildEventBus), httpWriteExecutorService);
                closeExecutorService("CounterAggregatorExecutor", counterAggregatorExecutor, COUNTER_AGGREGATOR_SERVICE_TIMEOUT_SECONDS);
                buildEventBus.post(CommandEvent.finished(startedEvent, exitCode));
            } catch (Throwable t) {
                LOG.debug(t, "Failing build on exception.");
                closeHttpExecutorService(cacheBuckConfig, Optional.empty(), httpWriteExecutorService);
                closeDiskIoExecutorService(diskIoExecutorService);
                flushEventListeners(console, buildId, eventListeners);
                throw t;
            } finally {
                if (commandSemaphoreAcquired) {
                    commandSemaphoreNgClient = Optional.empty();
                    BgProcessKiller.disarm();
                    // Allow another command to execute while outputting traces.
                    commandSemaphore.release();
                    commandSemaphoreAcquired = false;
                }
                if (isDaemon && shouldCleanUpTrash) {
                    // Clean up the trash in the background if this was a buckd
                    // read-write command. (We don't bother waiting for it to
                    // complete; the cleaner will ensure subsequent cleans are
                    // serialized with this one.)
                    TRASH_CLEANER.startCleaningDirectory(filesystem.getBuckPaths().getTrashDir());
                }
                // shut down the cached thread pools
                for (ExecutorPool p : executors.keySet()) {
                    closeExecutorService(p.toString(), executors.get(p), EXECUTOR_SERVICES_TIMEOUT_SECONDS);
                }
            }
            if (context.isPresent() && !rootCell.getBuckConfig().getFlushEventsBeforeExit()) {
                // Avoid client exit triggering client disconnection handling.
                context.get().in.close();
                // Allow nailgun client to exit while outputting traces.
                context.get().exit(exitCode);
            }
            closeDiskIoExecutorService(diskIoExecutorService);
            flushEventListeners(console, buildId, eventListeners);
            return exitCode;
        }
    } finally {
        if (commandSemaphoreAcquired) {
            commandSemaphoreNgClient = Optional.empty();
            BgProcessKiller.disarm();
            commandSemaphore.release();
        }
    }
}