DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (d38398e5144e)

VCS Links

UpdateStatus

Macros

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <stdlib.h>
#include <stdio.h>
#include "nsUpdateDriver.h"
#include "nsXULAppAPI.h"
#include "nsAppRunner.h"
#include "nsIWritablePropertyBag.h"
#include "nsIFile.h"
#include "nsVariant.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "prproces.h"
#include "mozilla/Logging.h"
#include "prenv.h"
#include "nsVersionComparator.h"
#include "nsXREDirProvider.h"
#include "SpecialSystemDirectory.h"
#include "nsDirectoryServiceDefs.h"
#include "nsThreadUtils.h"
#include "nsIXULAppInfo.h"
#include "mozilla/Preferences.h"
#include "nsPrintfCString.h"
#include "mozilla/DebugOnly.h"

#ifdef XP_MACOSX
#include "nsILocalFileMac.h"
#include "nsCommandLineServiceMac.h"
#include "MacLaunchHelper.h"
#include "updaterfileutils_osx.h"
#include "mozilla/Monitor.h"
#endif

#if defined(XP_WIN)
# include <direct.h>
# include <process.h>
# include <windows.h>
# include <shlwapi.h>
# include "nsWindowsHelpers.h"
# define getcwd(path, size) _getcwd(path, size)
# define getpid() GetCurrentProcessId()
#elif defined(XP_UNIX)
# include <unistd.h>
# include <sys/wait.h>
#endif

using namespace mozilla;

static PRLogModuleInfo *
GetUpdateLog()
{
  static PRLogModuleInfo *sUpdateLog;
  if (!sUpdateLog)
    sUpdateLog = PR_NewLogModule("updatedriver");
  return sUpdateLog;
}
#define LOG(args) MOZ_LOG(GetUpdateLog(), mozilla::LogLevel::Debug, args)

#ifdef XP_WIN
#define UPDATER_BIN "updater.exe"
#elif XP_MACOSX
#define UPDATER_BIN "org.mozilla.updater"
#else
#define UPDATER_BIN "updater"
#endif
#define UPDATER_INI "updater.ini"
#ifdef XP_MACOSX
#define UPDATER_APP "updater.app"
#endif
#if defined(XP_UNIX) && !defined(XP_MACOSX)
#define UPDATER_PNG "updater.png"
#endif

#if defined(MOZ_WIDGET_GONK)
#include <linux/ioprio.h>

static const int kB2GServiceArgc = 2;
static const char *kB2GServiceArgv[] = { "/system/bin/start", "b2g" };

static const char kAppUpdaterPrio[]        = "app.update.updater.prio";
static const char kAppUpdaterOomScoreAdj[] = "app.update.updater.oom_score_adj";
static const char kAppUpdaterIOPrioClass[] = "app.update.updater.ioprio.class";
static const char kAppUpdaterIOPrioLevel[] = "app.update.updater.ioprio.level";

static const int  kAppUpdaterPrioDefault        = 19;     // -20..19 where 19 = lowest priority
static const int  kAppUpdaterOomScoreAdjDefault = -1000;  // -1000 = Never kill
static const int  kAppUpdaterIOPrioClassDefault = IOPRIO_CLASS_IDLE;
static const int  kAppUpdaterIOPrioLevelDefault = 0;      // Doesn't matter for CLASS IDLE
#endif

#ifdef XP_MACOSX
static void
UpdateDriverSetupMacCommandLine(int& argc, char**& argv, bool restart)
{
  if (NS_IsMainThread()) {
    CommandLineServiceMac::SetupMacCommandLine(argc, argv, restart);
    return;
  }
  // Bug 1335916: SetupMacCommandLine calls a CoreFoundation function that
  // asserts that it was called from the main thread, so if we are not the main
  // thread, we have to dispatch that call to there. But we also have to get the
  // result from it, so we can't just dispatch and return, we have to wait
  // until the dispatched operation actually completes. So we also set up a
  // monitor to signal us when that happens, and block until then.
  Monitor monitor("nsUpdateDriver SetupMacCommandLine");

  nsresult rv = NS_DispatchToMainThread(
    NS_NewRunnableFunction([&argc, &argv, restart, &monitor]() -> void
    {
      CommandLineServiceMac::SetupMacCommandLine(argc, argv, restart);
      MonitorAutoLock(monitor).Notify();
    }));

  if (NS_FAILED(rv)) {
    LOG(("Update driver error dispatching SetupMacCommandLine to main thread: %d\n", rv));
    return;
  }

  // The length of this wait is arbitrary, but should be long enough that having
  // it expire means something is seriously wrong.
  rv = MonitorAutoLock(monitor).Wait(PR_SecondsToInterval(60));
  if (NS_FAILED(rv)) {
    LOG(("Update driver timed out waiting for SetupMacCommandLine: %d\n", rv));
  }
}
#endif

static nsresult
GetCurrentWorkingDir(char *buf, size_t size)
{
  // Cannot use NS_GetSpecialDirectory because XPCOM is not yet initialized.
  // This code is duplicated from xpcom/io/SpecialSystemDirectory.cpp:

#if defined(XP_WIN)
  wchar_t wpath[MAX_PATH];
  if (!_wgetcwd(wpath, size))
    return NS_ERROR_FAILURE;
  NS_ConvertUTF16toUTF8 path(wpath);
  strncpy(buf, path.get(), size);
#else
  if(!getcwd(buf, size))
    return NS_ERROR_FAILURE;
#endif
  return NS_OK;
}

/**
 * Get the path to the installation directory. For Mac OS X this will be the
 * bundle directory.
 *
 * @param appDir         the application directory file object
 * @param installDirPath the path to the installation directory
 */
static nsresult
GetInstallDirPath(nsIFile *appDir, nsACString& installDirPath)
{
  nsresult rv;
#ifdef XP_MACOSX
  nsCOMPtr<nsIFile> parentDir1, parentDir2;
  rv = appDir->GetParent(getter_AddRefs(parentDir1));
  if (NS_FAILED(rv)) {
    return rv;
  }
  rv = parentDir1->GetParent(getter_AddRefs(parentDir2));
  if (NS_FAILED(rv)) {
    return rv;
  }
  rv = parentDir2->GetNativePath(installDirPath);
#elif XP_WIN
  nsAutoString installDirPathW;
  rv = appDir->GetPath(installDirPathW);
  if (NS_FAILED(rv)) {
    return rv;
  }
  installDirPath = NS_ConvertUTF16toUTF8(installDirPathW);
#else
  rv = appDir->GetNativePath(installDirPath);
#endif
  if (NS_FAILED(rv)) {
    return rv;
  }
  return NS_OK;
}

#if defined(XP_MACOSX)
// This is a copy of OS X's XRE_GetBinaryPath from nsAppRunner.cpp with the
// gBinaryPath check removed so that the updater can reload the stub executable
// instead of xulrunner-bin. See bug 349737.
static nsresult
GetXULRunnerStubPath(const char* argv0, nsIFile* *aResult)
{
  // Works even if we're not bundled.
  CFBundleRef appBundle = ::CFBundleGetMainBundle();
  if (!appBundle)
    return NS_ERROR_FAILURE;

  CFURLRef bundleURL = ::CFBundleCopyExecutableURL(appBundle);
  if (!bundleURL)
    return NS_ERROR_FAILURE;

  nsCOMPtr<nsILocalFileMac> lfm;
  nsresult rv = NS_NewLocalFileWithCFURL(bundleURL, true, getter_AddRefs(lfm));

  ::CFRelease(bundleURL);

  if (NS_FAILED(rv))
    return rv;

  lfm.forget(aResult);
  return NS_OK;
}
#endif /* XP_MACOSX */

static bool
GetFile(nsIFile *dir, const nsCSubstring &name, nsCOMPtr<nsIFile> &result)
{
  nsresult rv;

  nsCOMPtr<nsIFile> file;
  rv = dir->Clone(getter_AddRefs(file));
  if (NS_FAILED(rv))
    return false;

  rv = file->AppendNative(name);
  if (NS_FAILED(rv))
    return false;

  result = do_QueryInterface(file, &rv);
  return NS_SUCCEEDED(rv);
}

static bool
GetStatusFile(nsIFile *dir, nsCOMPtr<nsIFile> &result)
{
  return GetFile(dir, NS_LITERAL_CSTRING("update.status"), result);
}

/**
 * Get the contents of the update.status file.
 *
 * @param statusFile the status file object.
 * @param buf        the buffer holding the file contents
 *
 * @return true if successful, false otherwise.
 */
template <size_t Size>
static bool
GetStatusFileContents(nsIFile *statusFile, char (&buf)[Size])
{
  static_assert(Size > 16, "Buffer needs to be large enough to hold the known status codes");

  PRFileDesc *fd = nullptr;
  nsresult rv = statusFile->OpenNSPRFileDesc(PR_RDONLY, 0660, &fd);
  if (NS_FAILED(rv))
    return false;

  const int32_t n = PR_Read(fd, buf, Size);
  PR_Close(fd);

  return (n >= 0);
}

typedef enum {
  eNoUpdateAction,
  ePendingUpdate,
  ePendingService,
  ePendingElevate,
  eAppliedUpdate,
  eAppliedService,
} UpdateStatus;

/**
 * Returns a value indicating what needs to be done in order to handle an update.
 *
 * @param dir the directory in which we should look for an update.status file.
 * @param statusFile the update.status file found in the directory.
 *
 * @return the update action to be performed.
 */
static UpdateStatus
GetUpdateStatus(nsIFile* dir, nsCOMPtr<nsIFile> &statusFile)
{
  if (GetStatusFile(dir, statusFile)) {
    char buf[32];
    if (GetStatusFileContents(statusFile, buf)) {
      const char kPending[] = "pending";
      const char kPendingService[] = "pending-service";
      const char kPendingElevate[] = "pending-elevate";
      const char kApplied[] = "applied";
      const char kAppliedService[] = "applied-service";
      if (!strncmp(buf, kPendingElevate, sizeof(kPendingElevate) - 1)) {
        return ePendingElevate;
      }
      if (!strncmp(buf, kPendingService, sizeof(kPendingService) - 1)) {
        return ePendingService;
      }
      if (!strncmp(buf, kPending, sizeof(kPending) - 1)) {
        return ePendingUpdate;
      }
      if (!strncmp(buf, kAppliedService, sizeof(kAppliedService) - 1)) {
        return eAppliedService;
      }
      if (!strncmp(buf, kApplied, sizeof(kApplied) - 1)) {
        return eAppliedUpdate;
      }
    }
  }
  return eNoUpdateAction;
}

static bool
GetVersionFile(nsIFile *dir, nsCOMPtr<nsIFile> &result)
{
  return GetFile(dir, NS_LITERAL_CSTRING("update.version"), result);
}

// Compares the current application version with the update's application
// version.
static bool
IsOlderVersion(nsIFile *versionFile, const char *appVersion)
{
  PRFileDesc *fd = nullptr;
  nsresult rv = versionFile->OpenNSPRFileDesc(PR_RDONLY, 0660, &fd);
  if (NS_FAILED(rv))
    return true;

  char buf[32];
  const int32_t n = PR_Read(fd, buf, sizeof(buf));
  PR_Close(fd);

  if (n < 0)
    return false;

  // Trim off the trailing newline
  if (buf[n - 1] == '\n')
    buf[n - 1] = '\0';

  // If the update xml doesn't provide the application version the file will
  // contain the string "null" and it is assumed that the update is not older.
  const char kNull[] = "null";
  if (strncmp(buf, kNull, sizeof(kNull) - 1) == 0)
    return false;

  if (mozilla::Version(appVersion) > buf)
    return true;

  return false;
}

static bool
CopyFileIntoUpdateDir(nsIFile *parentDir, const nsACString& leaf, nsIFile *updateDir)
{
  nsCOMPtr<nsIFile> file;

  // Make sure there is not an existing file in the target location.
  nsresult rv = updateDir->Clone(getter_AddRefs(file));
  if (NS_FAILED(rv))
    return false;
  rv = file->AppendNative(leaf);
  if (NS_FAILED(rv))
    return false;
  file->Remove(true);

  // Now, copy into the target location.
  rv = parentDir->Clone(getter_AddRefs(file));
  if (NS_FAILED(rv))
    return false;
  rv = file->AppendNative(leaf);
  if (NS_FAILED(rv))
    return false;
  rv = file->CopyToNative(updateDir, EmptyCString());
  if (NS_FAILED(rv))
    return false;

  return true;
}

static bool
CopyUpdaterIntoUpdateDir(nsIFile *greDir, nsIFile *appDir, nsIFile *updateDir,
                         nsCOMPtr<nsIFile> &updater)
{
  // Copy the updater application from the GRE and the updater ini from the app
#if defined(XP_MACOSX)
  if (!CopyFileIntoUpdateDir(appDir, NS_LITERAL_CSTRING(UPDATER_APP), updateDir))
    return false;
  CopyFileIntoUpdateDir(greDir, NS_LITERAL_CSTRING(UPDATER_INI), updateDir);
#else
  if (!CopyFileIntoUpdateDir(greDir, NS_LITERAL_CSTRING(UPDATER_BIN), updateDir))
    return false;
  CopyFileIntoUpdateDir(appDir, NS_LITERAL_CSTRING(UPDATER_INI), updateDir);
#endif
#if defined(XP_UNIX) && !defined(XP_MACOSX) && !defined(ANDROID)
  nsCOMPtr<nsIFile> iconDir;
  appDir->Clone(getter_AddRefs(iconDir));
  iconDir->AppendNative(NS_LITERAL_CSTRING("icons"));
  if (!CopyFileIntoUpdateDir(iconDir, NS_LITERAL_CSTRING(UPDATER_PNG), updateDir))
    return false;
#endif
  // Finally, return the location of the updater binary.
  nsresult rv = updateDir->Clone(getter_AddRefs(updater));
  if (NS_FAILED(rv))
    return false;
#if defined(XP_MACOSX)
  rv  = updater->AppendNative(NS_LITERAL_CSTRING(UPDATER_APP));
  nsresult tmp = updater->AppendNative(NS_LITERAL_CSTRING("Contents"));
  if (NS_FAILED(tmp)) {
    rv = tmp;
  }
  tmp = updater->AppendNative(NS_LITERAL_CSTRING("MacOS"));
  if (NS_FAILED(tmp) || NS_FAILED(rv))
    return false;
#endif
  rv = updater->AppendNative(NS_LITERAL_CSTRING(UPDATER_BIN));
  return NS_SUCCEEDED(rv);
}

/**
 * Appends the specified path to the library path.
 * This is used so that updater can find libmozsqlite3.so and other shared libs.
 *
 * @param pathToAppend A new library path to prepend to LD_LIBRARY_PATH
 */
#if defined(MOZ_VERIFY_MAR_SIGNATURE) && !defined(XP_WIN) && \
    !defined(XP_MACOSX) && !defined(MOZ_WIDGET_GONK)
#include "prprf.h"
#define PATH_SEPARATOR ":"
#define LD_LIBRARY_PATH_ENVVAR_NAME "LD_LIBRARY_PATH"
static void
AppendToLibPath(const char *pathToAppend)
{
  char *pathValue = getenv(LD_LIBRARY_PATH_ENVVAR_NAME);
  if (nullptr == pathValue || '\0' == *pathValue) {
    char *s = PR_smprintf("%s=%s", LD_LIBRARY_PATH_ENVVAR_NAME, pathToAppend);
    PR_SetEnv(s);
  } else if (!strstr(pathValue, pathToAppend)) {
    char *s = PR_smprintf("%s=%s" PATH_SEPARATOR "%s",
                    LD_LIBRARY_PATH_ENVVAR_NAME, pathToAppend, pathValue);
    PR_SetEnv(s);
  }

  // The memory used by PR_SetEnv is not copied to the environment on all
  // platform, it can be used by reference directly. So we purposely do not
  // call PR_smprintf_free on s.  Subsequent calls to PR_SetEnv will free
  // the old memory first.
}
#endif

/**
 * Switch an existing application directory to an updated version that has been
 * staged.
 *
 * @param greDir the GRE dir
 * @param updateDir the update dir where the mar file is located
 * @param appDir the app dir
 * @param appArgc the number of args to the application
 * @param appArgv the args to the application, used for restarting if needed
 */
static void
SwitchToUpdatedApp(nsIFile *greDir, nsIFile *updateDir,
                   nsIFile *appDir, int appArgc, char **appArgv)
{
  nsresult rv;

  // Steps:
  //  - copy updater into updates/0/MozUpdater/bgupdate/ dir on all platforms
  //    except Windows
  //  - run updater with the correct arguments
#ifndef XP_WIN
  nsCOMPtr<nsIFile> mozUpdaterDir;
  rv = updateDir->Clone(getter_AddRefs(mozUpdaterDir));
  if (NS_FAILED(rv)) {
    LOG(("failed cloning update dir\n"));
    return;
  }

  // Create a new directory named MozUpdater in the updates/0 directory to copy
  // the updater files to that will be used to replace the installation with the
  // staged application that has been updated. Note that we don't check for
  // directory creation errors since the call to CopyUpdaterIntoUpdateDir will
  // fail if the creation of the directory fails. A unique directory is created
  // in MozUpdater in case a previous attempt locked the directory or files.
  mozUpdaterDir->Append(NS_LITERAL_STRING("MozUpdater"));
  mozUpdaterDir->Append(NS_LITERAL_STRING("bgupdate"));
  rv = mozUpdaterDir->CreateUnique(nsIFile::DIRECTORY_TYPE, 0755);
  if (NS_FAILED(rv)) {
    LOG(("failed creating unique dir\n"));
    return;
  }

  nsCOMPtr<nsIFile> updater;
  if (!CopyUpdaterIntoUpdateDir(greDir, appDir, mozUpdaterDir, updater)) {
    LOG(("failed copying updater\n"));
    return;
  }
#endif

  // We need to use the value returned from XRE_GetBinaryPath when attempting
  // to restart the running application.
  nsCOMPtr<nsIFile> appFile;

#if defined(XP_MACOSX)
  // On OS X we need to pass the location of the xulrunner-stub executable
  // rather than xulrunner-bin. See bug 349737.
  GetXULRunnerStubPath(appArgv[0], getter_AddRefs(appFile));
#else
  XRE_GetBinaryPath(appArgv[0], getter_AddRefs(appFile));
#endif

  if (!appFile)
    return;

#ifdef XP_WIN
  nsAutoString appFilePathW;
  rv = appFile->GetPath(appFilePathW);
  if (NS_FAILED(rv)) {
    return;
  }
  NS_ConvertUTF16toUTF8 appFilePath(appFilePathW);

  nsCOMPtr<nsIFile> updater;
  rv = greDir->Clone(getter_AddRefs(updater));
  if (NS_FAILED(rv)) {
    return;
  }

  rv = updater->AppendNative(NS_LITERAL_CSTRING(UPDATER_BIN));
  if (NS_FAILED(rv)) {
    return;
  }

  nsAutoString updaterPathW;
  rv = updater->GetPath(updaterPathW);
  if (NS_FAILED(rv)) {
    return;
  }
  NS_ConvertUTF16toUTF8 updaterPath(updaterPathW);
#else

  nsAutoCString appFilePath;
#if defined(MOZ_WIDGET_GONK)
  appFilePath.Assign(kB2GServiceArgv[0]);
  appArgc = kB2GServiceArgc;
  appArgv = const_cast<char**>(kB2GServiceArgv);
#else
  rv = appFile->GetNativePath(appFilePath);
  if (NS_FAILED(rv))
    return;
#endif

  nsAutoCString updaterPath;
  rv = updater->GetNativePath(updaterPath);
  if (NS_FAILED(rv))
    return;
#endif

  nsAutoCString installDirPath;
  rv = GetInstallDirPath(appDir, installDirPath);
  if (NS_FAILED(rv)) {
    return;
  }

  // Get the directory where the update will be staged.
  nsAutoCString applyToDir;
  nsCOMPtr<nsIFile> updatedDir;
#ifdef XP_MACOSX
  if (!GetFile(updateDir, NS_LITERAL_CSTRING("Updated.app"), updatedDir)) {
#else
  if (!GetFile(appDir, NS_LITERAL_CSTRING("updated"), updatedDir)) {
#endif
    return;
  }
#ifdef XP_WIN
  nsAutoString applyToDirW;
  rv = updatedDir->GetPath(applyToDirW);
  if (NS_FAILED(rv)) {
    return;
  }
  applyToDir = NS_ConvertUTF16toUTF8(applyToDirW);
#else
  rv = updatedDir->GetNativePath(applyToDir);
#endif
  if (NS_FAILED(rv)) {
    return;
  }

  // Make sure that the updated directory exists
  bool updatedDirExists = false;
  updatedDir->Exists(&updatedDirExists);
  if (!updatedDirExists) {
    return;
  }

#if defined(XP_WIN)
  nsAutoString updateDirPathW;
  rv = updateDir->GetPath(updateDirPathW);
  NS_ConvertUTF16toUTF8 updateDirPath(updateDirPathW);
#else
  nsAutoCString updateDirPath;
  rv = updateDir->GetNativePath(updateDirPath);
#endif
  if (NS_FAILED(rv))
    return;

  // Get the current working directory.
  char workingDirPath[MAXPATHLEN];
  rv = GetCurrentWorkingDir(workingDirPath, sizeof(workingDirPath));
  if (NS_FAILED(rv))
    return;

  // Construct the PID argument for this process. We start the updater using
  // execv on all Unix platforms except Mac, so on those platforms we pass 0
  // instead of a good PID to signal the updater not to try and wait for us.
#if defined(XP_UNIX) & !defined(XP_MACOSX)
  nsAutoCString pid("0");
#else
  nsAutoCString pid;
  pid.AppendInt((int32_t) getpid());
#endif

  // Append a special token to the PID in order to let the updater know that it
  // just needs to replace the update directory.
  pid.AppendLiteral("/replace");

  int immersiveArgc = 0;
  int argc = appArgc + 6 + immersiveArgc;
  char **argv = new char*[argc + 1];
  if (!argv)
    return;
  argv[0] = (char*) updaterPath.get();
  argv[1] = (char*) updateDirPath.get();
  argv[2] = (char*) installDirPath.get();
  argv[3] = (char*) applyToDir.get();
  argv[4] = (char*) pid.get();
  if (appArgc) {
    argv[5] = workingDirPath;
    argv[6] = (char*) appFilePath.get();
    for (int i = 1; i < appArgc; ++i)
      argv[6 + i] = appArgv[i];
#ifdef XP_WIN
    if (immersiveArgc) {
      argv[argc - 1] = "-ServerName:DefaultBrowserServer";
    }
#endif
    argv[argc] = nullptr;
  } else {
    argc = 5;
    argv[5] = nullptr;
  }

  if (gSafeMode) {
    PR_SetEnv("MOZ_SAFE_MODE_RESTART=1");
  }
#if defined(MOZ_VERIFY_MAR_SIGNATURE) && !defined(XP_WIN) && \
    !defined(XP_MACOSX) && !defined(MOZ_WIDGET_GONK)
  AppendToLibPath(installDirPath.get());
#endif

  LOG(("spawning updater process for replacing [%s]\n", updaterPath.get()));

#if defined(XP_UNIX) & !defined(XP_MACOSX)
# if defined(MOZ_WIDGET_GONK)
  // In Gonk, we preload libmozglue, which the updater process doesn't need.
  // Since the updater will move and delete libmozglue.so, this can actually
  // stop the /system mount from correctly being remounted as read-only.
  unsetenv("LD_PRELOAD");
# endif
  exit(execv(updaterPath.get(), argv));
#elif defined(XP_WIN)
  // Switch the application using updater.exe
  if (!WinLaunchChild(updaterPathW.get(), argc, argv)) {
    return;
  }
  _exit(0);
#elif defined(XP_MACOSX)
  UpdateDriverSetupMacCommandLine(argc, argv, true);
  LaunchChildMac(argc, argv);
  exit(0);
#else
  PR_CreateProcessDetached(updaterPath.get(), argv, nullptr, nullptr);
  exit(0);
#endif
}

#if defined(MOZ_WIDGET_GONK)
static nsresult
GetOSApplyToDir(nsACString& applyToDir)
{
  nsCOMPtr<nsIProperties> ds =
    do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID);
  NS_ASSERTION(ds, "Can't get directory service");

  nsCOMPtr<nsIFile> osApplyToDir;
  nsresult rv = ds->Get(XRE_OS_UPDATE_APPLY_TO_DIR, NS_GET_IID(nsIFile),
                                   getter_AddRefs(osApplyToDir));
  if (NS_FAILED(rv)) {
    LOG(("Can't get the OS applyTo dir"));
    return rv;
  }

  return osApplyToDir->GetNativePath(applyToDir);
}

static void
SetOSApplyToDir(nsIUpdate* update, const nsACString& osApplyToDir)
{
  nsresult rv;
  nsCOMPtr<nsIWritablePropertyBag> updateProperties =
    do_QueryInterface(update, &rv);

  if (NS_FAILED(rv)) {
    return;
  }

  RefPtr<nsVariant> variant = new nsVariant();
  rv = variant->SetAsACString(osApplyToDir);
  if (NS_FAILED(rv)) {
    return;
  }

  updateProperties->SetProperty(NS_LITERAL_STRING("osApplyToDir"), variant);
}
#endif

/**
 * Apply an update. This applies to both normal and staged updates.
 *
 * @param greDir the GRE dir
 * @param updateDir the update root dir
 * @param statusFile the update.status file
 * @param appDir the app dir
 * @param appArgc the number of args to the application
 * @param appArgv the args to the application, used for restarting if needed
 * @param restart if true, apply the update in the foreground and restart the
 *                application when done.  otherwise, stage the update and don't
 *                restart the application.
 * @param outpid out parameter holding the handle to the updater application for
 *               staging updates.
 */
static void
ApplyUpdate(nsIFile *greDir, nsIFile *updateDir, nsIFile *statusFile,
            nsIFile *appDir, int appArgc, char **appArgv,
            bool restart, bool isOSUpdate, nsIFile *osApplyToDir,
            ProcessType *outpid)
{
  nsresult rv;

  // Steps:
  //  - mark update as 'applying'
  //  - copy updater into update dir on all platforms except Windows
  //  - run updater w/ appDir as the current working dir
#ifndef XP_WIN
  nsCOMPtr<nsIFile> updater;
  if (!CopyUpdaterIntoUpdateDir(greDir, appDir, updateDir, updater)) {
    LOG(("failed copying updater\n"));
    return;
  }
#endif

  // We need to use the value returned from XRE_GetBinaryPath when attempting
  // to restart the running application.
  nsCOMPtr<nsIFile> appFile;

#if defined(XP_MACOSX)
  // On OS X we need to pass the location of the xulrunner-stub executable
  // rather than xulrunner-bin. See bug 349737.
  GetXULRunnerStubPath(appArgv[0], getter_AddRefs(appFile));
#else
  XRE_GetBinaryPath(appArgv[0], getter_AddRefs(appFile));
#endif

  if (!appFile)
    return;

#ifdef XP_WIN
  nsAutoString appFilePathW;
  rv = appFile->GetPath(appFilePathW);
  if (NS_FAILED(rv)) {
    return;
  }
  NS_ConvertUTF16toUTF8 appFilePath(appFilePathW);

  nsCOMPtr<nsIFile> updater;
  rv = greDir->Clone(getter_AddRefs(updater));
  if (NS_FAILED(rv)) {
    return;
  }

  rv = updater->AppendNative(NS_LITERAL_CSTRING(UPDATER_BIN));
  if (NS_FAILED(rv)) {
    return;
  }

  nsAutoString updaterPathW;
  rv = updater->GetPath(updaterPathW);
  if (NS_FAILED(rv)) {
    return;
  }
  NS_ConvertUTF16toUTF8 updaterPath(updaterPathW);
#else
  nsAutoCString appFilePath;
  rv = appFile->GetNativePath(appFilePath);
  if (NS_FAILED(rv))
    return;

  nsAutoCString updaterPath;
  rv = updater->GetNativePath(updaterPath);
  if (NS_FAILED(rv))
    return;

#endif

  nsAutoCString installDirPath;
  rv = GetInstallDirPath(appDir, installDirPath);
  if (NS_FAILED(rv))
    return;

  // Get the directory where the update was staged for replace and GONK OS
  // Updates or where it will be applied.
#ifndef MOZ_WIDGET_GONK
  // OS Updates are only supported on GONK so force it to false on everything
  // but GONK to simplify the following logic.
  isOSUpdate = false;
#endif
  nsAutoCString applyToDir;
  nsCOMPtr<nsIFile> updatedDir;
  if (restart && !isOSUpdate) {
    applyToDir.Assign(installDirPath);
  } else {
#ifdef XP_MACOSX
    if (!GetFile(updateDir, NS_LITERAL_CSTRING("Updated.app"), updatedDir)) {
#else
    if (!GetFile(appDir, NS_LITERAL_CSTRING("updated"), updatedDir)) {
#endif
      return;
    }
#ifdef XP_WIN
    nsAutoString applyToDirW;
    rv = updatedDir->GetPath(applyToDirW);
    if (NS_FAILED(rv)) {
      return;
    }
    applyToDir = NS_ConvertUTF16toUTF8(applyToDirW);
#elif MOZ_WIDGET_GONK
    if (isOSUpdate) {
      if (!osApplyToDir) {
        return;
      }
      rv = osApplyToDir->GetNativePath(applyToDir);
    } else {
      rv = updatedDir->GetNativePath(applyToDir);
    }
#else
    rv = updatedDir->GetNativePath(applyToDir);
#endif
  }
  if (NS_FAILED(rv))
    return;

#if defined(XP_WIN)
  nsAutoString updateDirPathW;
  rv = updateDir->GetPath(updateDirPathW);
  NS_ConvertUTF16toUTF8 updateDirPath(updateDirPathW);
#else
  nsAutoCString updateDirPath;
  rv = updateDir->GetNativePath(updateDirPath);
#endif
  if (NS_FAILED(rv)) {
    return;
  }

  // Get the current working directory.
  char workingDirPath[MAXPATHLEN];
  rv = GetCurrentWorkingDir(workingDirPath, sizeof(workingDirPath));
  if (NS_FAILED(rv))
    return;

  // We used to write out "Applying" to the update.status file here.
  // Instead we do this from within the updater application now.
  // This is so that we don't overwrite the status of pending-service
  // in the Windows case.  This change was made for all platforms so
  // that it stays consistent across all OS.

  // On platforms where we are not calling execv, we may need to make the
  // updater executable wait for the calling process to exit.  Otherwise, the
  // updater may have trouble modifying our executable image (because it might
  // still be in use).  This is accomplished by passing our PID to the updater so
  // that it can wait for us to exit.  This is not perfect as there is a race
  // condition that could bite us.  It's possible that the calling process could
  // exit before the updater waits on the specified PID, and in the meantime a
  // new process with the same PID could be created.  This situation is unlikely,
  // however, given the way most operating systems recycle PIDs.  We'll take our
  // chances ;-)
  // Construct the PID argument for this process.  If we are using execv, then
  // we pass "0" which is then ignored by the updater.
  nsAutoCString pid;
  if (!restart) {
    // Signal the updater application that it should stage the update.
    pid.AssignASCII("-1");
  } else {
#if defined(XP_UNIX) & !defined(XP_MACOSX)
    pid.AssignASCII("0");
#else
    pid.AppendInt((int32_t) getpid());
#endif
  }

  int immersiveArgc = 0;
  int argc = appArgc + 6 + immersiveArgc;
  char **argv = new char*[argc + 1 ];
  if (!argv)
    return;
  argv[0] = (char*) updaterPath.get();
  argv[1] = (char*) updateDirPath.get();
  argv[2] = (char*) installDirPath.get();
  argv[3] = (char*) applyToDir.get();
  argv[4] = (char*) pid.get();
  if (restart && appArgc) {
    argv[5] = workingDirPath;
    argv[6] = (char*) appFilePath.get();
    for (int i = 1; i < appArgc; ++i)
      argv[6 + i] = appArgv[i];
#ifdef XP_WIN
    if (immersiveArgc) {
      argv[argc - 1] = "-ServerName:DefaultBrowserServer";
    }
#endif
    argv[argc] = nullptr;
  } else {
    argc = 5;
    argv[5] = nullptr;
  }

  if (gSafeMode) {
    PR_SetEnv("MOZ_SAFE_MODE_RESTART=1");
  }
#if defined(MOZ_VERIFY_MAR_SIGNATURE) && !defined(XP_WIN) && \
    !defined(XP_MACOSX) && !defined(MOZ_WIDGET_GONK)
  AppendToLibPath(installDirPath.get());
#endif

  if (isOSUpdate) {
    PR_SetEnv("MOZ_OS_UPDATE=1");
  }
#if defined(MOZ_WIDGET_GONK)
  // We want the updater to be CPU friendly and not subject to being killed by
  // the low memory killer, so we pass in some preferences to allow it to
  // adjust its priority.

  int32_t prioVal = Preferences::GetInt(kAppUpdaterPrio,
                                        kAppUpdaterPrioDefault);
  int32_t oomScoreAdj = Preferences::GetInt(kAppUpdaterOomScoreAdj,
                                            kAppUpdaterOomScoreAdjDefault);
  int32_t ioprioClass = Preferences::GetInt(kAppUpdaterIOPrioClass,
                                            kAppUpdaterIOPrioClassDefault);
  int32_t ioprioLevel = Preferences::GetInt(kAppUpdaterIOPrioLevel,
                                            kAppUpdaterIOPrioLevelDefault);
  nsPrintfCString prioEnv("MOZ_UPDATER_PRIO=%d/%d/%d/%d",
                          prioVal, oomScoreAdj, ioprioClass, ioprioLevel);
  // Note: we allocate a new string on heap and pass that to PR_SetEnv, since
  // the string can be used after this function returns.  This means that we
  // will intentionally leak this buffer.
  PR_SetEnv(ToNewCString(prioEnv));
#endif

  LOG(("spawning updater process [%s]\n", updaterPath.get()));

#if defined(XP_UNIX) && !defined(XP_MACOSX)
  // We use execv to spawn the updater process on all UNIX systems except Mac OSX
  // since it is known to cause problems on the Mac.  Windows has execv, but it
  // is a faked implementation that doesn't really replace the current process.
  // Instead it spawns a new process, so we gain nothing from using execv on
  // Windows.
  if (restart) {
    exit(execv(updaterPath.get(), argv));
  }
  *outpid = fork();
  if (*outpid == -1) {
    return;
  } else if (*outpid == 0) {