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