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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "chrome/installer/setup/user_experiment.h" |
| 6 |
| 7 #include <windows.h> |
| 8 |
| 9 #include <lm.h> |
| 10 #include <shellapi.h> |
| 11 #include <wtsapi32.h> |
| 12 |
| 13 #include <memory> |
| 14 |
| 15 #include "base/command_line.h" |
| 16 #include "base/files/file_path.h" |
| 17 #include "base/process/launch.h" |
| 18 #include "base/process/process_info.h" |
| 19 #include "base/rand_util.h" |
| 20 #include "base/strings/string16.h" |
| 21 #include "base/strings/string_number_conversions.h" |
| 22 #include "base/win/registry.h" |
| 23 #include "base/win/scoped_handle.h" |
| 24 #include "base/win/scoped_process_information.h" |
| 25 #include "base/win/win_util.h" |
| 26 #include "base/win/windows_version.h" |
| 27 #include "chrome/common/chrome_switches.h" |
| 28 #include "chrome/common/chrome_version.h" |
| 29 #include "chrome/install_static/install_modes.h" |
| 30 #include "chrome/install_static/install_util.h" |
| 31 #include "chrome/installer/setup/installer_state.h" |
| 32 #include "chrome/installer/setup/setup_constants.h" |
| 33 #include "chrome/installer/setup/setup_singleton.h" |
| 34 #include "chrome/installer/setup/setup_util.h" |
| 35 #include "chrome/installer/setup/update_active_setup_version_work_item.h" |
| 36 #include "chrome/installer/util/experiment.h" |
| 37 #include "chrome/installer/util/experiment_storage.h" |
| 38 #include "chrome/installer/util/google_update_constants.h" |
| 39 #include "chrome/installer/util/google_update_settings.h" |
| 40 #include "chrome/installer/util/install_util.h" |
| 41 #include "chrome/installer/util/util_constants.h" |
| 42 #include "ui/base/fullscreen_win.h" |
| 43 |
| 44 namespace installer { |
| 45 |
| 46 namespace { |
| 47 |
| 48 // The study currently being conducted. |
| 49 constexpr ExperimentStorage::Study kCurrentStudy = ExperimentStorage::kStudyOne; |
| 50 |
| 51 // The primary group for study number two. |
| 52 constexpr int kStudyTwoGroup = 0; |
| 53 |
| 54 // Test switches. |
| 55 constexpr char kExperimentEnableForTesting[] = "experiment-enable-for-testing"; |
| 56 constexpr char kExperimentEnterpriseBypass[] = "experiment-enterprise-bypass"; |
| 57 constexpr char kExperimentParticipation[] = "experiment-participation"; |
| 58 constexpr char kExperimentRetryDelay[] = "experiment-retry-delay"; |
| 59 |
| 60 // Returns true if the experiment is enabled for testing. |
| 61 bool IsExperimentEnabledForTesting() { |
| 62 return base::CommandLine::ForCurrentProcess()->HasSwitch( |
| 63 kExperimentEnableForTesting); |
| 64 } |
| 65 |
| 66 // Returns true if the install originated from the MSI or if the machine is |
| 67 // joined to a domain. This check can be bypassed via |
| 68 // --experiment-enterprise-bypass. |
| 69 bool IsEnterpriseInstall(const InstallerState& installer_state) { |
| 70 if (base::CommandLine::ForCurrentProcess()->HasSwitch( |
| 71 kExperimentEnterpriseBypass)) { |
| 72 return false; |
| 73 } |
| 74 return installer_state.is_msi() || IsDomainJoined(); |
| 75 } |
| 76 |
| 77 // Returns the delay to be used between presentation retries. The default (five |
| 78 // minutes) can be overidden via --experiment-retry-delay=SECONDS. |
| 79 base::TimeDelta GetRetryDelay() { |
| 80 base::CommandLine* command_line = base::CommandLine::ForCurrentProcess(); |
| 81 base::string16 value = |
| 82 command_line->GetSwitchValueNative(kExperimentRetryDelay); |
| 83 int seconds; |
| 84 if (!value.empty() && base::StringToInt(value, &seconds)) |
| 85 return base::TimeDelta::FromSeconds(seconds); |
| 86 return base::TimeDelta::FromMinutes(5); |
| 87 } |
| 88 |
| 89 // Overrides the participation value for testing if a value is provided via |
| 90 // --experiment-participation=value. "value" may be "one" or "two". Any other |
| 91 // value (or none at all) results in clearing the persisted state for organic |
| 92 // re-evaluation. |
| 93 ExperimentStorage::Study HandleParticipationOverride( |
| 94 ExperimentStorage::Study current_participation, |
| 95 ExperimentStorage::Lock* lock) { |
| 96 base::CommandLine* command_line = base::CommandLine::ForCurrentProcess(); |
| 97 if (!command_line->HasSwitch(kExperimentParticipation)) |
| 98 return current_participation; |
| 99 |
| 100 base::string16 participation_override = |
| 101 command_line->GetSwitchValueNative(kExperimentParticipation); |
| 102 ExperimentStorage::Study participation = ExperimentStorage::kNoStudySelected; |
| 103 if (participation_override == L"one") |
| 104 participation = ExperimentStorage::kStudyOne; |
| 105 else if (participation_override == L"two") |
| 106 participation = ExperimentStorage::kStudyTwo; |
| 107 |
| 108 if (participation != current_participation) |
| 109 lock->WriteParticipation(participation); |
| 110 |
| 111 return participation; |
| 112 } |
| 113 |
| 114 // This function launches setup as the currently logged-in interactive |
| 115 // user, that is, the user whose logon session is attached to winsta0\default. |
| 116 // It assumes that currently we are running as SYSTEM in a non-interactive |
| 117 // window station. |
| 118 // The function fails if there is no interactive session active, basically |
| 119 // the computer is on but nobody has logged in locally. |
| 120 // Remote Desktop sessions do not count as interactive sessions; running this |
| 121 // method as a user logged in via remote desktop will do nothing. |
| 122 bool LaunchSetupAsConsoleUser(const base::CommandLine& cmd_line) { |
| 123 DWORD console_id = ::WTSGetActiveConsoleSessionId(); |
| 124 if (console_id == 0xFFFFFFFF) { |
| 125 PLOG(ERROR) << __func__ << " no session attached to the console"; |
| 126 return false; |
| 127 } |
| 128 base::win::ScopedHandle user_token_handle; |
| 129 { |
| 130 HANDLE user_token; |
| 131 if (!::WTSQueryUserToken(console_id, &user_token)) { |
| 132 PLOG(ERROR) << __func__ << " failed to get user token for console_id " |
| 133 << console_id; |
| 134 return false; |
| 135 } |
| 136 user_token_handle.Set(user_token); |
| 137 } |
| 138 base::LaunchOptions options; |
| 139 options.as_user = user_token_handle.Get(); |
| 140 options.empty_desktop_name = true; |
| 141 VLOG(1) << "Spawning experiment process: " << cmd_line.GetCommandLineString(); |
| 142 if (base::LaunchProcess(cmd_line, options).IsValid()) |
| 143 return true; |
| 144 PLOG(ERROR) << "Failed"; |
| 145 return false; |
| 146 } |
| 147 |
| 148 // Returns true if the Windows shell indicates that the machine isn't in |
| 149 // presentation mode, running a full-screen D3D app, or in a quiet period. |
| 150 bool MayShowNotifications() { |
| 151 QUERY_USER_NOTIFICATION_STATE state = {}; |
| 152 HRESULT result = SHQueryUserNotificationState(&state); |
| 153 if (FAILED(result)) |
| 154 return true; |
| 155 // Explicitly allow the acceptable states rather than the converse to be sure |
| 156 // there are no surprises should new states be introduced. |
| 157 return state == QUNS_NOT_PRESENT || // Locked/screensaver running. |
| 158 state == QUNS_ACCEPTS_NOTIFICATIONS; // Go for it! |
| 159 } |
| 160 |
| 161 bool UserSessionIsNotYoung() { |
| 162 static constexpr base::TimeDelta kMinSessionLength = |
| 163 base::TimeDelta::FromMinutes(5); |
| 164 base::Time session_start_time = GetConsoleSessionStartTime(); |
| 165 if (session_start_time.is_null()) |
| 166 return true; |
| 167 |
| 168 base::TimeDelta session_length = base::Time::Now() - session_start_time; |
| 169 return session_length >= kMinSessionLength; |
| 170 } |
| 171 |
| 172 bool ActiveWindowIsNotFullscreen() { |
| 173 return !ui::IsFullScreenMode(); |
| 174 } |
| 175 |
| 176 // Blocks processing if conditions are not right for presentation. Returns true |
| 177 // if presentation should continue, or false otherwise (e.g., another process |
| 178 // requires the setup singleton). |
| 179 bool WaitForPresentation( |
| 180 const SetupSingleton& setup_singleton, |
| 181 Experiment* experiment, |
| 182 ExperimentStorage* storage, |
| 183 std::unique_ptr<ExperimentStorage::Lock>* storage_lock) { |
| 184 base::TimeDelta retry_delay = GetRetryDelay(); |
| 185 bool first_sleep = true; |
| 186 bool loop_again = true; |
| 187 |
| 188 do { |
| 189 if (MayShowNotifications() && UserSessionIsNotYoung() && |
| 190 ActiveWindowIsNotFullscreen()) { |
| 191 return true; |
| 192 } |
| 193 |
| 194 // Update the state accordingly if this is the first sleep. |
| 195 if (first_sleep) { |
| 196 experiment->SetState(ExperimentMetrics::kDeferringPresentation); |
| 197 (*storage_lock)->StoreExperiment(*experiment); |
| 198 first_sleep = false; |
| 199 } |
| 200 |
| 201 // Release the storage lock and wait on the singleton for five minutes. |
| 202 storage_lock->reset(); |
| 203 // Break when another process needs the singleton. |
| 204 loop_again = !setup_singleton.WaitForInterrupt(retry_delay); |
| 205 *storage_lock = storage->AcquireLock(); |
| 206 } while (loop_again); |
| 207 |
| 208 return false; |
| 209 } |
| 210 |
| 211 } // namespace |
| 212 |
| 213 // Execution may be in the context of the system or a user on it, and no |
| 214 // guarantee is made regarding the setup singleton. |
| 215 bool ShouldRunUserExperiment(const InstallerState& installer_state) { |
| 216 if (!install_static::kUseGoogleUpdateIntegration) |
| 217 return false; |
| 218 |
| 219 if (!install_static::SupportsRetentionExperiments()) |
| 220 return false; |
| 221 |
| 222 // The current experiment only applies to Windows 10 and newer. |
| 223 if (base::win::GetVersion() < base::win::VERSION_WIN10) |
| 224 return false; |
| 225 |
| 226 // Enterprise brand codes and domain joined machines are excluded. |
| 227 if (IsEnterpriseInstall(installer_state)) |
| 228 return false; |
| 229 |
| 230 // Gain exclusive access to the persistent experiment state. Only per-install |
| 231 // state may be queried (participation and metrics are okay; Experiment itself |
| 232 // is not). |
| 233 ExperimentStorage storage; |
| 234 auto lock = storage.AcquireLock(); |
| 235 |
| 236 // Bail out if this install is not selected into the fraction participating in |
| 237 // the current study. |
| 238 // NOTE: No clients will participate while this feature is under development. |
| 239 if (!IsExperimentEnabledForTesting() || |
| 240 !IsSelectedForStudy(lock.get(), kCurrentStudy)) { |
| 241 return false; |
| 242 } |
| 243 |
| 244 // Skip the experiment if a user on the machine has already reached a terminal |
| 245 // state. |
| 246 ExperimentMetrics metrics; |
| 247 if (!lock->LoadMetrics(&metrics) || metrics.InTerminalState()) |
| 248 return false; |
| 249 |
| 250 return true; |
| 251 } |
| 252 |
| 253 // Execution is from the context of the installer immediately following a |
| 254 // successful update. The setup singleton is held. |
| 255 void BeginUserExperiment(const InstallerState& installer_state, |
| 256 const base::FilePath& setup_path, |
| 257 bool user_context) { |
| 258 ExperimentStorage storage; |
| 259 |
| 260 // Prepare a command line to relaunch the installed setup.exe for the |
| 261 // experiment. |
| 262 base::CommandLine setup_command(setup_path); |
| 263 InstallUtil::AppendModeSwitch(&setup_command); |
| 264 if (installer_state.system_install()) |
| 265 setup_command.AppendSwitch(switches::kSystemLevel); |
| 266 if (installer_state.verbose_logging()) |
| 267 setup_command.AppendSwitch(switches::kVerboseLogging); |
| 268 setup_command.AppendSwitch(switches::kUserExperiment); |
| 269 // Copy any test switches used by the spawned process. |
| 270 static constexpr const char* kSwitchesToCopy[] = { |
| 271 kExperimentRetryDelay, |
| 272 }; |
| 273 setup_command.CopySwitchesFrom(*base::CommandLine::ForCurrentProcess(), |
| 274 kSwitchesToCopy, arraysize(kSwitchesToCopy)); |
| 275 |
| 276 if (user_context) { |
| 277 // This is either a per-user install or a per-machine install run via |
| 278 // Active Setup as a normal user. |
| 279 DCHECK(!installer_state.system_install() || |
| 280 base::GetCurrentProcessIntegrityLevel() == base::MEDIUM_INTEGRITY); |
| 281 VLOG(1) << "Spawning experiment process: " |
| 282 << setup_command.GetCommandLineString(); |
| 283 // The installer is already running in the context of an ordinary user. |
| 284 // Relaunch directly to run the experiment. |
| 285 base::LaunchOptions launch_options; |
| 286 launch_options.force_breakaway_from_job_ = true; |
| 287 if (!base::LaunchProcess(setup_command, launch_options).IsValid()) { |
| 288 LOG(ERROR) << __func__ |
| 289 << " failed to relaunch installer for user experiment,"; |
| 290 WriteInitialState(&storage, ExperimentMetrics::kRelaunchFailed); |
| 291 } |
| 292 return; |
| 293 } |
| 294 |
| 295 // The installer is running at high integrity, likely as SYSTEM. Relaunch as |
| 296 // the console user at medium integrity. |
| 297 VLOG(1) << "Attempting to spawn experiment as console user."; |
| 298 if (LaunchSetupAsConsoleUser(setup_command)) { |
| 299 return; |
| 300 } |
| 301 |
| 302 // Trigger Active Setup to run on the next user logon if this machine has |
| 303 // never participated in the experiment. This will be done at most once per |
| 304 // machine, even across updates. Doing so more often risks having excessive |
| 305 // active setup activity for some users. |
| 306 auto storage_lock = storage.AcquireLock(); |
| 307 ExperimentMetrics experiment_metrics; |
| 308 if (storage_lock->LoadMetrics(&experiment_metrics) && |
| 309 experiment_metrics.state == ExperimentMetrics::kUninitialized) { |
| 310 UpdateActiveSetupVersionWorkItem item( |
| 311 install_static::GetActiveSetupPath(), |
| 312 UpdateActiveSetupVersionWorkItem::UPDATE_AND_BUMP_SELECTIVE_TRIGGER); |
| 313 if (item.Do()) { |
| 314 VLOG(1) << "Bumped Active Setup Version for user experiment"; |
| 315 experiment_metrics.state = ExperimentMetrics::kWaitingForUserLogon; |
| 316 storage_lock->StoreMetrics(experiment_metrics); |
| 317 } else { |
| 318 LOG(ERROR) << "Failed to bump Active Setup Version for user experiment."; |
| 319 } |
| 320 } |
| 321 } |
| 322 |
| 323 // This function executes within the context of a signed-in user, even for the |
| 324 // case of system-level installs. In particular, it may be run in a spawned |
| 325 // setup.exe immediately after a successful update or following user logon as a |
| 326 // result of Active Setup. |
| 327 void RunUserExperiment(const base::CommandLine& command_line, |
| 328 const MasterPreferences& master_preferences, |
| 329 InstallationState* original_state, |
| 330 InstallerState* installer_state) { |
| 331 VLOG(1) << __func__; |
| 332 |
| 333 ExperimentStorage storage; |
| 334 std::unique_ptr<SetupSingleton> setup_singleton(SetupSingleton::Acquire( |
| 335 command_line, master_preferences, original_state, installer_state)); |
| 336 if (!setup_singleton) { |
| 337 VLOG(1) << "Timed out while waiting for setup singleton"; |
| 338 WriteInitialState(&storage, ExperimentMetrics::kSingletonWaitTimeout); |
| 339 return; |
| 340 } |
| 341 |
| 342 Experiment experiment; |
| 343 auto storage_lock = storage.AcquireLock(); |
| 344 |
| 345 // Determine the study in which this client participates. |
| 346 ExperimentStorage::Study participation = ExperimentStorage::kNoStudySelected; |
| 347 if (!storage_lock->ReadParticipation(&participation) || |
| 348 participation == ExperimentStorage::kNoStudySelected) { |
| 349 // ShouldRunUserExperiment should have brought this client into a particular |
| 350 // study. Something is very wrong if it can't be determined here. |
| 351 LOG(ERROR) << "Failed to read study participation."; |
| 352 return; |
| 353 } |
| 354 |
| 355 if (!storage_lock->LoadExperiment(&experiment)) { |
| 356 // The metrics correspond to a different user on the machine; nothing to do. |
| 357 VLOG(1) << "Another user is participating in the experiment."; |
| 358 return; |
| 359 } |
| 360 |
| 361 // There is nothing to do if the user has already reached a terminal state. |
| 362 if (experiment.metrics().InTerminalState()) { |
| 363 VLOG(1) << "Experiment has reached terminal state: " |
| 364 << experiment.metrics().state; |
| 365 return; |
| 366 } |
| 367 |
| 368 // Now the fun begins. Assign this user to a group if this is the first time |
| 369 // through. |
| 370 if (experiment.metrics().InInitialState()) { |
| 371 experiment.AssignGroup(PickGroup(participation)); |
| 372 VLOG(1) << "Assigned user to experiment group: " |
| 373 << experiment.metrics().group; |
| 374 } |
| 375 |
| 376 // Chrome is considered actively used if it has been run within the last 28 |
| 377 // days or if it was installed within the same time period. |
| 378 int days_ago_last_run = GoogleUpdateSettings::GetLastRunTime(); |
| 379 if ((days_ago_last_run >= 0 ? days_ago_last_run |
| 380 : GetInstallAge(*installer_state)) <= 28) { |
| 381 VLOG(1) << "Aborting experiment due to activity."; |
| 382 experiment.SetState(ExperimentMetrics::kIsActive); |
| 383 storage_lock->StoreExperiment(experiment); |
| 384 return; |
| 385 } |
| 386 |
| 387 // Check for a dormant user: one for which the machine has been off or the |
| 388 // user has been signed out for more than 90% of the last 28 days. |
| 389 if (false) { // TODO(grt): Implement this. |
| 390 VLOG(1) << "Aborting experiment due to dormancy."; |
| 391 experiment.SetState(ExperimentMetrics::kIsDormant); |
| 392 storage_lock->StoreExperiment(experiment); |
| 393 return; |
| 394 } |
| 395 |
| 396 if (base::win::IsTabletDevice(nullptr)) { |
| 397 VLOG(1) << "Aborting experiment due to tablet device."; |
| 398 experiment.SetState(ExperimentMetrics::kIsTabletDevice); |
| 399 storage_lock->StoreExperiment(experiment); |
| 400 return; |
| 401 } |
| 402 |
| 403 if (IsUpdateRenamePending()) { |
| 404 VLOG(1) << "Aborting experiment due to Chrome update rename pending."; |
| 405 experiment.SetState(ExperimentMetrics::kIsUpdateRenamePending); |
| 406 storage_lock->StoreExperiment(experiment); |
| 407 return; |
| 408 } |
| 409 |
| 410 if (!WaitForPresentation(*setup_singleton, &experiment, &storage, |
| 411 &storage_lock)) { |
| 412 VLOG(1) << "Aborting experiment while waiting to present."; |
| 413 experiment.SetState(ExperimentMetrics::kDeferredPresentationAborted); |
| 414 storage_lock->StoreExperiment(experiment); |
| 415 return; |
| 416 } |
| 417 |
| 418 VLOG(1) << "Launching Chrome to show the toast."; |
| 419 experiment.SetState(ExperimentMetrics::kLaunchingChrome); |
| 420 storage_lock->StoreExperiment(experiment); |
| 421 LaunchChrome(*installer_state, experiment); |
| 422 } |
| 423 |
| 424 // Writes the initial state |state| to the registry if there is no existing |
| 425 // state for this or another user. |
| 426 void WriteInitialState(ExperimentStorage* storage, |
| 427 ExperimentMetrics::State state) { |
| 428 auto storage_lock = storage->AcquireLock(); |
| 429 |
| 430 // Write the state provided that there is either no existing state or that |
| 431 // any that exists also represents an initial state. |
| 432 ExperimentMetrics experiment_metrics; |
| 433 if (storage_lock->LoadMetrics(&experiment_metrics) && |
| 434 experiment_metrics.InInitialState()) { |
| 435 experiment_metrics.state = state; |
| 436 storage_lock->StoreMetrics(experiment_metrics); |
| 437 } |
| 438 } |
| 439 |
| 440 bool IsDomainJoined() { |
| 441 LPWSTR buffer = nullptr; |
| 442 NETSETUP_JOIN_STATUS buffer_type = NetSetupUnknownStatus; |
| 443 bool is_joined = |
| 444 ::NetGetJoinInformation(nullptr, &buffer, &buffer_type) == NERR_Success && |
| 445 buffer_type == NetSetupDomainName; |
| 446 if (buffer) |
| 447 NetApiBufferFree(buffer); |
| 448 |
| 449 return is_joined; |
| 450 } |
| 451 |
| 452 bool IsSelectedForStudy(ExperimentStorage::Lock* lock, |
| 453 ExperimentStorage::Study current_study) { |
| 454 ExperimentStorage::Study participation = ExperimentStorage::kNoStudySelected; |
| 455 if (!lock->ReadParticipation(&participation)) |
| 456 return false; |
| 457 |
| 458 participation = HandleParticipationOverride(participation, lock); |
| 459 |
| 460 if (participation == ExperimentStorage::kNoStudySelected) { |
| 461 // This install has not been evaluated for participation. Do so now. Select |
| 462 // a small population into the first study of the experiment. Everyone else |
| 463 // gets the second study. |
| 464 participation = base::RandDouble() <= 0.02756962532 |
| 465 ? ExperimentStorage::kStudyOne |
| 466 : ExperimentStorage::kStudyTwo; |
| 467 if (!lock->WriteParticipation(participation)) |
| 468 return false; |
| 469 } |
| 470 |
| 471 return participation <= current_study; |
| 472 } |
| 473 |
| 474 int PickGroup(ExperimentStorage::Study participation) { |
| 475 DCHECK(participation == ExperimentStorage::kStudyOne || |
| 476 participation == ExperimentStorage::kStudyTwo); |
| 477 static constexpr int kHoldbackGroup = ExperimentMetrics::kNumGroups - 1; |
| 478 |
| 479 if (participation == ExperimentStorage::kStudyOne) { |
| 480 // Evenly distrubute clients among the groups. |
| 481 return base::RandInt(0, ExperimentMetrics::kNumGroups - 1); |
| 482 } |
| 483 |
| 484 // 1% holdback, 99% in the winning group. |
| 485 return base::RandDouble() < 0.01 ? kHoldbackGroup : kStudyTwoGroup; |
| 486 } |
| 487 |
| 488 bool IsUpdateRenamePending() { |
| 489 // Consider an update to be pending if an "opv" value is present in the |
| 490 // registry or if Chrome's version as registered with Omaha doesn't match the |
| 491 // current version. |
| 492 base::string16 clients_key_path = |
| 493 install_static::GetClientsKeyPath(install_static::GetAppGuid()); |
| 494 const HKEY root = install_static::IsSystemInstall() ? HKEY_LOCAL_MACHINE |
| 495 : HKEY_CURRENT_USER; |
| 496 base::win::RegKey clients_key; |
| 497 |
| 498 // The failure modes below are generally indicitive of a run from a |
| 499 // non-installed Chrome. Pretend that all is well. |
| 500 if (clients_key.Open(root, clients_key_path.c_str(), |
| 501 KEY_WOW64_64KEY | KEY_QUERY_VALUE) != ERROR_SUCCESS) { |
| 502 return false; |
| 503 } |
| 504 if (clients_key.HasValue(google_update::kRegOldVersionField)) |
| 505 return true; |
| 506 base::string16 product_version; |
| 507 if (clients_key.ReadValue(google_update::kRegVersionField, |
| 508 &product_version) != ERROR_SUCCESS) { |
| 509 return false; |
| 510 } |
| 511 return product_version != TEXT(CHROME_VERSION_STRING); |
| 512 } |
| 513 |
| 514 void LaunchChrome(const InstallerState& installer_state, |
| 515 const Experiment& experiment) { |
| 516 const base::FilePath chrome_exe = |
| 517 installer_state.target_path().Append(kChromeExe); |
| 518 base::CommandLine command_line(chrome_exe); |
| 519 command_line.AppendSwitchNative(::switches::kTryChromeAgain, |
| 520 base::IntToString16(experiment.group())); |
| 521 |
| 522 STARTUPINFOW startup_info = {sizeof(startup_info)}; |
| 523 PROCESS_INFORMATION temp_process_info = {}; |
| 524 base::string16 writable_command_line_string( |
| 525 command_line.GetCommandLineString()); |
| 526 if (!::CreateProcess( |
| 527 chrome_exe.value().c_str(), &writable_command_line_string[0], |
| 528 nullptr /* lpProcessAttributes */, nullptr /* lpThreadAttributes */, |
| 529 FALSE /* bInheritHandles */, CREATE_NO_WINDOW, |
| 530 nullptr /* lpEnvironment */, nullptr /* lpCurrentDirectory */, |
| 531 &startup_info, &temp_process_info)) { |
| 532 PLOG(ERROR) << "Failed to launch: " << writable_command_line_string; |
| 533 return; |
| 534 } |
| 535 |
| 536 // Ensure that the thread and process handles of the new process are closed. |
| 537 base::win::ScopedProcessInformation process_info(temp_process_info); |
| 538 } |
| 539 |
| 540 } // namespace installer |
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