chrome/installer/util/install_util.cc

   1 // Copyright (c) 2012 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 // See the corresponding header file for description of the functions in this
   6 // file.
   7
   8 #include "chrome/installer/util/install_util.h"
   9
  10 #include <shellapi.h>
  11 #include <shlobj.h>
  12 #include <shlwapi.h>
  13
  14 #include <algorithm>
  15
  16 #include "base/command_line.h"
  17 #include "base/environment.h"
  18 #include "base/files/file_util.h"
  19 #include "base/logging.h"
  20 #include "base/memory/scoped_ptr.h"
  21 #include "base/numerics/safe_conversions.h"
  22 #include "base/path_service.h"
  23 #include "base/process/launch.h"
  24 #include "base/strings/string_util.h"
  25 #include "base/strings/utf_string_conversions.h"
  26 #include "base/sys_info.h"
  27 #include "base/values.h"
  28 #include "base/version.h"
  29 #include "base/win/metro.h"
  30 #include "base/win/registry.h"
  31 #include "base/win/windows_version.h"
  32 #include "chrome/common/chrome_constants.h"
  33 #include "chrome/common/chrome_paths.h"
  34 #include "chrome/installer/util/browser_distribution.h"
  35 #include "chrome/installer/util/google_update_constants.h"
  36 #include "chrome/installer/util/helper.h"
  37 #include "chrome/installer/util/installation_state.h"
  38 #include "chrome/installer/util/l10n_string_util.h"
  39 #include "chrome/installer/util/util_constants.h"
  40 #include "chrome/installer/util/work_item_list.h"
  41
  42 using base::win::RegKey;
  43 using installer::ProductState;
  44
  45 namespace {
  46
  47 const wchar_t kStageBinaryPatching[] = L"binary_patching";
  48 const wchar_t kStageBuilding[] = L"building";
  49 const wchar_t kStageConfiguringAutoLaunch[] = L"configuring_auto_launch";
  50 const wchar_t kStageCopyingPreferencesFile[] = L"copying_prefs";
  51 const wchar_t kStageCreatingShortcuts[] = L"creating_shortcuts";
  52 const wchar_t kStageEnsemblePatching[] = L"ensemble_patching";
  53 const wchar_t kStageExecuting[] = L"executing";
  54 const wchar_t kStageFinishing[] = L"finishing";
  55 const wchar_t kStagePreconditions[] = L"preconditions";
  56 const wchar_t kStageRefreshingPolicy[] = L"refreshing_policy";
  57 const wchar_t kStageRegisteringChrome[] = L"registering_chrome";
  58 const wchar_t kStageRemovingOldVersions[] = L"removing_old_ver";
  59 const wchar_t kStageRollingback[] = L"rollingback";
  60 const wchar_t kStageUncompressing[] = L"uncompressing";
  61 const wchar_t kStageUnpacking[] = L"unpacking";
  62 const wchar_t kStageUpdatingChannels[] = L"updating_channels";
  63 const wchar_t kStageCreatingVisualManifest[] = L"creating_visual_manifest";
  64 const wchar_t kStageDeferringToHigherVersion[] = L"deferring_to_higher_version";
  65 const wchar_t kStageUninstallingBinaries[] = L"uninstalling_binaries";
  66 const wchar_t kStageUninstallingChromeFrame[] = L"uninstalling_chrome_frame";
  67
  68 const wchar_t* const kStages[] = {
  69   NULL,
  70   kStagePreconditions,
  71   kStageUncompressing,
  72   kStageEnsemblePatching,
  73   kStageBinaryPatching,
  74   kStageUnpacking,
  75   kStageBuilding,
  76   kStageExecuting,
  77   kStageRollingback,
  78   kStageRefreshingPolicy,
  79   kStageUpdatingChannels,
  80   kStageCopyingPreferencesFile,
  81   kStageCreatingShortcuts,
  82   kStageRegisteringChrome,
  83   kStageRemovingOldVersions,
  84   kStageFinishing,
  85   kStageConfiguringAutoLaunch,
  86   kStageCreatingVisualManifest,
  87   kStageDeferringToHigherVersion,
  88   kStageUninstallingBinaries,
  89   kStageUninstallingChromeFrame,
  90 };
  91
  92 COMPILE_ASSERT(installer::NUM_STAGES == arraysize(kStages),
  93                kStages_disagrees_with_Stage_comma_they_must_match_bang);
  94
  95 // Creates a zero-sized non-decorated foreground window that doesn't appear
  96 // in the taskbar. This is used as a parent window for calls to ShellExecuteEx
  97 // in order for the UAC dialog to appear in the foreground and for focus
  98 // to be returned to this process once the UAC task is dismissed. Returns
  99 // NULL on failure, a handle to the UAC window on success.
 100 HWND CreateUACForegroundWindow() {
 101   HWND foreground_window = ::CreateWindowEx(WS_EX_TOOLWINDOW,
 102                                             L"STATIC",
 103                                             NULL,
 104                                             WS_POPUP | WS_VISIBLE,
 105                                             0, 0, 0, 0,
 106                                             NULL, NULL,
 107                                             ::GetModuleHandle(NULL),
 108                                             NULL);
 109   if (foreground_window) {
 110     HMONITOR monitor = ::MonitorFromWindow(foreground_window,
 111                                            MONITOR_DEFAULTTONEAREST);
 112     if (monitor) {
 113       MONITORINFO mi = {0};
 114       mi.cbSize = sizeof(mi);
 115       ::GetMonitorInfo(monitor, &mi);
 116       RECT screen_rect = mi.rcWork;
 117       int x_offset = (screen_rect.right - screen_rect.left) / 2;
 118       int y_offset = (screen_rect.bottom - screen_rect.top) / 2;
 119       ::MoveWindow(foreground_window,
 120                    screen_rect.left + x_offset,
 121                    screen_rect.top + y_offset,
 122                    0, 0, FALSE);
 123     } else {
 124       NOTREACHED() << "Unable to get default monitor";
 125     }
 126     ::SetForegroundWindow(foreground_window);
 127   }
 128   return foreground_window;
 129 }
 130
 131 }  // namespace
 132
 133 base::string16 InstallUtil::GetActiveSetupPath(BrowserDistribution* dist) {
 134   static const wchar_t kInstalledComponentsPath[] =
 135       L"Software\\Microsoft\\Active Setup\\Installed Components\\";
 136   return kInstalledComponentsPath + dist->GetActiveSetupGuid();
 137 }
 138
 139 void InstallUtil::TriggerActiveSetupCommand() {
 140   base::string16 active_setup_reg(
 141       GetActiveSetupPath(BrowserDistribution::GetDistribution()));
 142   base::win::RegKey active_setup_key(
 143       HKEY_LOCAL_MACHINE, active_setup_reg.c_str(), KEY_QUERY_VALUE);
 144   base::string16 cmd_str;
 145   LONG read_status = active_setup_key.ReadValue(L"StubPath", &cmd_str);
 146   if (read_status != ERROR_SUCCESS) {
 147     LOG(ERROR) << active_setup_reg << ", " << read_status;
 148     // This should never fail if Chrome is registered at system-level, but if it
 149     // does there is not much else to be done.
 150     return;
 151   }
 152
 153   base::CommandLine cmd(base::CommandLine::FromString(cmd_str));
 154   // Force creation of shortcuts as the First Run beacon might land between now
 155   // and the time setup.exe checks for it.
 156   cmd.AppendSwitch(installer::switches::kForceConfigureUserSettings);
 157
 158   base::LaunchOptions launch_options;
 159   if (base::win::IsMetroProcess())
 160     launch_options.force_breakaway_from_job_ = true;
 161   base::Process process =
 162       base::LaunchProcess(cmd.GetCommandLineString(), launch_options);
 163   if (!process.IsValid())
 164     PLOG(ERROR) << cmd.GetCommandLineString();
 165 }
 166
 167 bool InstallUtil::ExecuteExeAsAdmin(const base::CommandLine& cmd,
 168                                     DWORD* exit_code) {
 169   base::FilePath::StringType program(cmd.GetProgram().value());
 170   DCHECK(!program.empty());
 171   DCHECK_NE(program[0], L'\"');
 172
 173   base::CommandLine::StringType params(cmd.GetCommandLineString());
 174   if (params[0] == '"') {
 175     DCHECK_EQ('"', params[program.length() + 1]);
 176     DCHECK_EQ(program, params.substr(1, program.length()));
 177     params = params.substr(program.length() + 2);
 178   } else {
 179     DCHECK_EQ(program, params.substr(0, program.length()));
 180     params = params.substr(program.length());
 181   }
 182
 183   base::TrimWhitespace(params, base::TRIM_ALL, &params);
 184
 185   HWND uac_foreground_window = CreateUACForegroundWindow();
 186
 187   SHELLEXECUTEINFO info = {0};
 188   info.cbSize = sizeof(SHELLEXECUTEINFO);
 189   info.fMask = SEE_MASK_NOCLOSEPROCESS;
 190   info.hwnd = uac_foreground_window;
 191   info.lpVerb = L"runas";
 192   info.lpFile = program.c_str();
 193   info.lpParameters = params.c_str();
 194   info.nShow = SW_SHOW;
 195
 196   bool success = false;
 197   if (::ShellExecuteEx(&info) == TRUE) {
 198     ::WaitForSingleObject(info.hProcess, INFINITE);
 199     DWORD ret_val = 0;
 200     if (::GetExitCodeProcess(info.hProcess, &ret_val)) {
 201       success = true;
 202       if (exit_code)
 203         *exit_code = ret_val;
 204     }
 205   }
 206
 207   if (uac_foreground_window) {
 208     DestroyWindow(uac_foreground_window);
 209   }
 210
 211   return success;
 212 }
 213
 214 base::CommandLine InstallUtil::GetChromeUninstallCmd(
 215     bool system_install,
 216     BrowserDistribution::Type distribution_type) {
 217   ProductState state;
 218   if (state.Initialize(system_install, distribution_type)) {
 219     return state.uninstall_command();
 220   }
 221   return base::CommandLine(base::CommandLine::NO_PROGRAM);
 222 }
 223
 224 void InstallUtil::GetChromeVersion(BrowserDistribution* dist,
 225                                    bool system_install,
 226                                    Version* version) {
 227   DCHECK(dist);
 228   RegKey key;
 229   HKEY reg_root = (system_install) ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 230   LONG result = key.Open(reg_root,
 231                          dist->GetVersionKey().c_str(),
 232                          KEY_QUERY_VALUE | KEY_WOW64_32KEY);
 233
 234   base::string16 version_str;
 235   if (result == ERROR_SUCCESS)
 236     result = key.ReadValue(google_update::kRegVersionField, &version_str);
 237
 238   *version = Version();
 239   if (result == ERROR_SUCCESS && !version_str.empty()) {
 240     VLOG(1) << "Existing " << dist->GetDisplayName() << " version found "
 241             << version_str;
 242     *version = Version(base::UTF16ToASCII(version_str));
 243   } else {
 244     DCHECK_EQ(ERROR_FILE_NOT_FOUND, result);
 245     VLOG(1) << "No existing " << dist->GetDisplayName()
 246             << " install found.";
 247   }
 248 }
 249
 250 void InstallUtil::GetCriticalUpdateVersion(BrowserDistribution* dist,
 251                                            bool system_install,
 252                                            Version* version) {
 253   DCHECK(dist);
 254   RegKey key;
 255   HKEY reg_root = (system_install) ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 256   LONG result = key.Open(reg_root,
 257                          dist->GetVersionKey().c_str(),
 258                          KEY_QUERY_VALUE | KEY_WOW64_32KEY);
 259
 260   base::string16 version_str;
 261   if (result == ERROR_SUCCESS)
 262     result = key.ReadValue(google_update::kRegCriticalVersionField,
 263                            &version_str);
 264
 265   *version = Version();
 266   if (result == ERROR_SUCCESS && !version_str.empty()) {
 267     VLOG(1) << "Critical Update version for " << dist->GetDisplayName()
 268             << " found " << version_str;
 269     *version = Version(base::UTF16ToASCII(version_str));
 270   } else {
 271     DCHECK_EQ(ERROR_FILE_NOT_FOUND, result);
 272     VLOG(1) << "No existing " << dist->GetDisplayName()
 273             << " install found.";
 274   }
 275 }
 276
 277 bool InstallUtil::IsOSSupported() {
 278   // We do not support Win2K or older, or XP without service pack 2.
 279   VLOG(1) << base::SysInfo::OperatingSystemName() << ' '
 280           << base::SysInfo::OperatingSystemVersion();
 281   base::win::Version version = base::win::GetVersion();
 282   return (version > base::win::VERSION_XP) ||
 283       ((version == base::win::VERSION_XP) &&
 284        (base::win::OSInfo::GetInstance()->service_pack().major >= 2));
 285 }
 286
 287 void InstallUtil::AddInstallerResultItems(
 288     bool system_install,
 289     const base::string16& state_key,
 290     installer::InstallStatus status,
 291     int string_resource_id,
 292     const base::string16* const launch_cmd,
 293     WorkItemList* install_list) {
 294   DCHECK(install_list);
 295   const HKEY root = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 296   DWORD installer_result = (GetInstallReturnCode(status) == 0) ? 0 : 1;
 297   install_list->AddCreateRegKeyWorkItem(root, state_key, KEY_WOW64_32KEY);
 298   install_list->AddSetRegValueWorkItem(root,
 299                                        state_key,
 300                                        KEY_WOW64_32KEY,
 301                                        installer::kInstallerResult,
 302                                        installer_result,
 303                                        true);
 304   install_list->AddSetRegValueWorkItem(root,
 305                                        state_key,
 306                                        KEY_WOW64_32KEY,
 307                                        installer::kInstallerError,
 308                                        static_cast<DWORD>(status),
 309                                        true);
 310   if (string_resource_id != 0) {
 311     base::string16 msg = installer::GetLocalizedString(string_resource_id);
 312     install_list->AddSetRegValueWorkItem(root,
 313                                          state_key,
 314                                          KEY_WOW64_32KEY,
 315                                          installer::kInstallerResultUIString,
 316                                          msg,
 317                                          true);
 318   }
 319   if (launch_cmd != NULL && !launch_cmd->empty()) {
 320     install_list->AddSetRegValueWorkItem(
 321         root,
 322         state_key,
 323         KEY_WOW64_32KEY,
 324         installer::kInstallerSuccessLaunchCmdLine,
 325         *launch_cmd,
 326         true);
 327   }
 328 }
 329
 330 void InstallUtil::UpdateInstallerStage(bool system_install,
 331                                        const base::string16& state_key_path,
 332                                        installer::InstallerStage stage) {
 333   DCHECK_LE(static_cast<installer::InstallerStage>(0), stage);
 334   DCHECK_GT(installer::NUM_STAGES, stage);
 335   const HKEY root = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 336   RegKey state_key;
 337   LONG result =
 338       state_key.Open(root,
 339                      state_key_path.c_str(),
 340                      KEY_QUERY_VALUE | KEY_SET_VALUE | KEY_WOW64_32KEY);
 341   if (result == ERROR_SUCCESS) {
 342     if (stage == installer::NO_STAGE) {
 343       result = state_key.DeleteValue(installer::kInstallerExtraCode1);
 344       LOG_IF(ERROR, result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND)
 345           << "Failed deleting installer stage from " << state_key_path
 346           << "; result: " << result;
 347     } else {
 348       const DWORD extra_code_1 = static_cast<DWORD>(stage);
 349       result = state_key.WriteValue(installer::kInstallerExtraCode1,
 350                                     extra_code_1);
 351       LOG_IF(ERROR, result != ERROR_SUCCESS)
 352           << "Failed writing installer stage to " << state_key_path
 353           << "; result: " << result;
 354     }
 355     // TODO(grt): Remove code below here once we're convinced that our use of
 356     // Google Update's new InstallerExtraCode1 value is good.
 357     installer::ChannelInfo channel_info;
 358     // This will return false if the "ap" value isn't present, which is fine.
 359     channel_info.Initialize(state_key);
 360     if (channel_info.SetStage(kStages[stage]) &&
 361         !channel_info.Write(&state_key)) {
 362       LOG(ERROR) << "Failed writing installer stage to " << state_key_path;
 363     }
 364   } else {
 365     LOG(ERROR) << "Failed opening " << state_key_path
 366                << " to update installer stage; result: " << result;
 367   }
 368 }
 369
 370 bool InstallUtil::IsPerUserInstall(const base::FilePath& exe_path) {
 371   scoped_ptr<base::Environment> env(base::Environment::Create());
 372
 373   static const char kEnvProgramFilesPath[] = "CHROME_PROBED_PROGRAM_FILES_PATH";
 374   std::string env_program_files_path;
 375   // Check environment variable to find program files path.
 376   base::FilePath program_files_path;
 377   if (env->GetVar(kEnvProgramFilesPath, &env_program_files_path) &&
 378       !env_program_files_path.empty()) {
 379     program_files_path =
 380         base::FilePath(base::UTF8ToWide(env_program_files_path));
 381   } else {
 382     const int kProgramFilesKey =
 383 #if defined(_WIN64)
 384         // TODO(wfh): Revise this when Chrome is/can be installed in the 64-bit
 385         // program files directory.
 386         base::DIR_PROGRAM_FILESX86;
 387 #else
 388         base::DIR_PROGRAM_FILES;
 389 #endif
 390     if (!PathService::Get(kProgramFilesKey, &program_files_path)) {
 391       NOTREACHED();
 392       return true;
 393     }
 394     env->SetVar(kEnvProgramFilesPath,
 395                 base::WideToUTF8(program_files_path.value()));
 396   }
 397
 398   // Return true if the program files path is not a case-insensitive prefix of
 399   // the exe path.
 400   if (exe_path.value().size() < program_files_path.value().size())
 401     return true;
 402   DWORD prefix_len =
 403       base::saturated_cast<DWORD>(program_files_path.value().size());
 404   return ::CompareString(LOCALE_USER_DEFAULT, NORM_IGNORECASE,
 405                          exe_path.value().data(), prefix_len,
 406                          program_files_path.value().data(), prefix_len) !=
 407       CSTR_EQUAL;
 408 }
 409
 410 bool InstallUtil::IsMultiInstall(BrowserDistribution* dist,
 411                                  bool system_install) {
 412   DCHECK(dist);
 413   ProductState state;
 414   return state.Initialize(system_install, dist) && state.is_multi_install();
 415 }
 416
 417 bool CheckIsChromeSxSProcess() {
 418   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 419   CHECK(command_line);
 420
 421   if (command_line->HasSwitch(installer::switches::kChromeSxS))
 422     return true;
 423
 424   // Also return true if we are running from Chrome SxS installed path.
 425   base::FilePath exe_dir;
 426   PathService::Get(base::DIR_EXE, &exe_dir);
 427   base::string16 chrome_sxs_dir(installer::kGoogleChromeInstallSubDir2);
 428   chrome_sxs_dir.append(installer::kSxSSuffix);
 429
 430   // This is SxS if current EXE is in or under (possibly multiple levels under)
 431   // |chrome_sxs_dir|\|installer::kInstallBinaryDir|
 432   std::vector<base::FilePath::StringType> components;
 433   exe_dir.GetComponents(&components);
 434   // We need at least 1 element in the array for the behavior of the following
 435   // loop to be defined.  This should always be true, since we're splitting the
 436   // path to our executable and one of the components will be the drive letter.
 437   DCHECK(!components.empty());
 438   typedef std::vector<base::FilePath::StringType>::const_reverse_iterator
 439       ComponentsIterator;
 440   for (ComponentsIterator current = components.rbegin(), parent = current + 1;
 441        parent != components.rend(); current = parent++) {
 442     if (base::FilePath::CompareEqualIgnoreCase(
 443             *current, installer::kInstallBinaryDir) &&
 444         base::FilePath::CompareEqualIgnoreCase(*parent, chrome_sxs_dir)) {
 445       return true;
 446     }
 447   }
 448
 449   return false;
 450 }
 451
 452 bool InstallUtil::IsChromeSxSProcess() {
 453   static bool sxs = CheckIsChromeSxSProcess();
 454   return sxs;
 455 }
 456
 457 // static
 458 bool InstallUtil::IsFirstRunSentinelPresent() {
 459   // TODO(msw): Consolidate with first_run::internal::IsFirstRunSentinelPresent.
 460   base::FilePath user_data_dir;
 461   return !PathService::Get(chrome::DIR_USER_DATA, &user_data_dir) ||
 462          base::PathExists(user_data_dir.Append(chrome::kFirstRunSentinel));
 463 }
 464
 465 // static
 466 bool InstallUtil::GetEULASentinelFilePath(base::FilePath* path) {
 467   base::FilePath user_data_dir;
 468   if (!PathService::Get(chrome::DIR_USER_DATA, &user_data_dir))
 469     return false;
 470   *path = user_data_dir.Append(installer::kEULASentinelFile);
 471   return true;
 472 }
 473
 474 // This method tries to delete a registry key and logs an error message
 475 // in case of failure. It returns true if deletion is successful (or the key did
 476 // not exist), otherwise false.
 477 bool InstallUtil::DeleteRegistryKey(HKEY root_key,
 478                                     const base::string16& key_path,
 479                                     REGSAM wow64_access) {
 480   VLOG(1) << "Deleting registry key " << key_path;
 481   RegKey target_key;
 482   LONG result = target_key.Open(root_key, key_path.c_str(),
 483                                 KEY_READ | KEY_WRITE | wow64_access);
 484
 485   if (result == ERROR_FILE_NOT_FOUND)
 486     return true;
 487
 488   if (result == ERROR_SUCCESS)
 489     result = target_key.DeleteKey(L"");
 490
 491   if (result != ERROR_SUCCESS) {
 492     LOG(ERROR) << "Failed to delete registry key: " << key_path
 493                << " error: " << result;
 494     return false;
 495   }
 496   return true;
 497 }
 498
 499 // This method tries to delete a registry value and logs an error message
 500 // in case of failure. It returns true if deletion is successful (or the key did
 501 // not exist), otherwise false.
 502 bool InstallUtil::DeleteRegistryValue(HKEY reg_root,
 503                                       const base::string16& key_path,
 504                                       REGSAM wow64_access,
 505                                       const base::string16& value_name) {
 506   RegKey key;
 507   LONG result = key.Open(reg_root, key_path.c_str(),
 508                          KEY_SET_VALUE | wow64_access);
 509   if (result == ERROR_SUCCESS)
 510     result = key.DeleteValue(value_name.c_str());
 511   if (result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND) {
 512     LOG(ERROR) << "Failed to delete registry value: " << value_name
 513                << " error: " << result;
 514     return false;
 515   }
 516   return true;
 517 }
 518
 519 // static
 520 InstallUtil::ConditionalDeleteResult InstallUtil::DeleteRegistryKeyIf(
 521     HKEY root_key,
 522     const base::string16& key_to_delete_path,
 523     const base::string16& key_to_test_path,
 524     const REGSAM wow64_access,
 525     const wchar_t* value_name,
 526     const RegistryValuePredicate& predicate) {
 527   DCHECK(root_key);
 528   ConditionalDeleteResult delete_result = NOT_FOUND;
 529   RegKey key;
 530   base::string16 actual_value;
 531   if (key.Open(root_key, key_to_test_path.c_str(),
 532                KEY_QUERY_VALUE | wow64_access) == ERROR_SUCCESS &&
 533       key.ReadValue(value_name, &actual_value) == ERROR_SUCCESS &&
 534       predicate.Evaluate(actual_value)) {
 535     key.Close();
 536     delete_result = DeleteRegistryKey(root_key,
 537                                       key_to_delete_path,
 538                                       wow64_access)
 539         ? DELETED : DELETE_FAILED;
 540   }
 541   return delete_result;
 542 }
 543
 544 // static
 545 InstallUtil::ConditionalDeleteResult InstallUtil::DeleteRegistryValueIf(
 546     HKEY root_key,
 547     const wchar_t* key_path,
 548     REGSAM wow64_access,
 549     const wchar_t* value_name,
 550     const RegistryValuePredicate& predicate) {
 551   DCHECK(root_key);
 552   DCHECK(key_path);
 553   ConditionalDeleteResult delete_result = NOT_FOUND;
 554   RegKey key;
 555   base::string16 actual_value;
 556   if (key.Open(root_key, key_path,
 557                KEY_QUERY_VALUE | KEY_SET_VALUE | wow64_access)
 558           == ERROR_SUCCESS &&
 559       key.ReadValue(value_name, &actual_value) == ERROR_SUCCESS &&
 560       predicate.Evaluate(actual_value)) {
 561     LONG result = key.DeleteValue(value_name);
 562     if (result != ERROR_SUCCESS) {
 563       LOG(ERROR) << "Failed to delete registry value: "
 564                  << (value_name ? value_name : L"(Default)")
 565                  << " error: " << result;
 566       delete_result = DELETE_FAILED;
 567     }
 568     delete_result = DELETED;
 569   }
 570   return delete_result;
 571 }
 572
 573 bool InstallUtil::ValueEquals::Evaluate(const base::string16& value) const {
 574   return value == value_to_match_;
 575 }
 576
 577 // static
 578 int InstallUtil::GetInstallReturnCode(installer::InstallStatus status) {
 579   switch (status) {
 580     case installer::FIRST_INSTALL_SUCCESS:
 581     case installer::INSTALL_REPAIRED:
 582     case installer::NEW_VERSION_UPDATED:
 583     case installer::IN_USE_UPDATED:
 584     case installer::UNUSED_BINARIES_UNINSTALLED:
 585       return 0;
 586     default:
 587       return status;
 588   }
 589 }
 590
 591 // static
 592 void InstallUtil::ComposeCommandLine(const base::string16& program,
 593                                      const base::string16& arguments,
 594                                      base::CommandLine* command_line) {
 595   *command_line =
 596       base::CommandLine::FromString(L"\"" + program + L"\" " + arguments);
 597 }
 598
 599 // static
 600 base::string16 InstallUtil::GetCurrentDate() {
 601   static const wchar_t kDateFormat[] = L"yyyyMMdd";
 602   wchar_t date_str[arraysize(kDateFormat)] = {0};
 603   int len = GetDateFormatW(LOCALE_INVARIANT, 0, NULL, kDateFormat,
 604                            date_str, arraysize(date_str));
 605   if (len) {
 606     --len;  // Subtract terminating \0.
 607   } else {
 608     PLOG(DFATAL) << "GetDateFormat";
 609   }
 610
 611   return base::string16(date_str, len);
 612 }
 613
 614 // Open |path| with minimal access to obtain information about it, returning
 615 // true and populating |file| on success.
 616 // static
 617 bool InstallUtil::ProgramCompare::OpenForInfo(const base::FilePath& path,
 618                                               base::File* file) {
 619   DCHECK(file);
 620   file->Initialize(path, base::File::FLAG_OPEN);
 621   return file->IsValid();
 622 }
 623
 624 // Populate |info| for |file|, returning true on success.
 625 // static
 626 bool InstallUtil::ProgramCompare::GetInfo(const base::File& file,
 627                                           BY_HANDLE_FILE_INFORMATION* info) {
 628   DCHECK(file.IsValid());
 629   return GetFileInformationByHandle(file.GetPlatformFile(), info) != 0;
 630 }
 631
 632 InstallUtil::ProgramCompare::ProgramCompare(const base::FilePath& path_to_match)
 633     : path_to_match_(path_to_match),
 634       file_info_() {
 635   DCHECK(!path_to_match_.empty());
 636   if (!OpenForInfo(path_to_match_, &file_)) {
 637     PLOG(WARNING) << "Failed opening " << path_to_match_.value()
 638                   << "; falling back to path string comparisons.";
 639   } else if (!GetInfo(file_, &file_info_)) {
 640     PLOG(WARNING) << "Failed getting information for "
 641                   << path_to_match_.value()
 642                   << "; falling back to path string comparisons.";
 643     file_.Close();
 644   }
 645 }
 646
 647 InstallUtil::ProgramCompare::~ProgramCompare() {
 648 }
 649
 650 bool InstallUtil::ProgramCompare::Evaluate(const base::string16& value) const {
 651   // Suss out the exe portion of the value, which is expected to be a command
 652   // line kinda (or exactly) like:
 653   // "c:\foo\bar\chrome.exe" -- "%1"
 654   base::FilePath program(base::CommandLine::FromString(value).GetProgram());
 655   if (program.empty()) {
 656     LOG(WARNING) << "Failed to parse an executable name from command line: \""
 657                  << value << "\"";
 658     return false;
 659   }
 660
 661   return EvaluatePath(program);
 662 }
 663
 664 bool InstallUtil::ProgramCompare::EvaluatePath(
 665     const base::FilePath& path) const {
 666   // Try the simple thing first: do the paths happen to match?
 667   if (base::FilePath::CompareEqualIgnoreCase(path_to_match_.value(),
 668                                              path.value()))
 669     return true;
 670
 671   // If the paths don't match and we couldn't open the expected file, we've done
 672   // our best.
 673   if (!file_.IsValid())
 674     return false;
 675
 676   // Open the program and see if it references the expected file.
 677   base::File file;
 678   BY_HANDLE_FILE_INFORMATION info = {};
 679
 680   return (OpenForInfo(path, &file) &&
 681           GetInfo(file, &info) &&
 682           info.dwVolumeSerialNumber == file_info_.dwVolumeSerialNumber &&
 683           info.nFileIndexHigh == file_info_.nFileIndexHigh &&
 684           info.nFileIndexLow == file_info_.nFileIndexLow);
 685 }