Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 955 insertions, 0 deletions

diff --git a/toolkit/xre/nsUpdateDriver.cpp b/toolkit/xre/nsUpdateDriver.cpp
new file mode 100644
index 0000000000..c355741c76
--- /dev/null
+++ b/toolkit/xre/nsUpdateDriver.cpp
@@ -0,0 +1,955 @@
+/* -*- 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 "nsDebug.h"
+#include "nsXULAppAPI.h"
+#include "nsAppRunner.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 "nsDirectoryServiceDefs.h"
+#include "nsThreadUtils.h"
+#include "nsIXULAppInfo.h"
+#include "mozilla/Preferences.h"
+#include "nsPrintfCString.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/ErrorNames.h"
+#include "mozilla/Printf.h"
+#include "mozilla/UniquePtr.h"
+#include "nsIObserverService.h"
+#include "nsNetCID.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/Services.h"
+#include "mozilla/dom/Promise.h"
+
+#ifdef XP_MACOSX
+#  include "nsILocalFileMac.h"
+#  include "nsCommandLineServiceMac.h"
+#  include "MacLaunchHelper.h"
+#  include "updaterfileutils_osx.h"
+#  include "mozilla/Monitor.h"
+#  include "gfxPlatformMac.h"
+#endif
+
+#if defined(XP_WIN)
+#  include <direct.h>
+#  include <process.h>
+#  include <windows.h>
+#  include <shlwapi.h>
+#  include <strsafe.h>
+#  include "commonupdatedir.h"
+#  include "nsWindowsHelpers.h"
+#  include "pathhash.h"
+#  include "WinUtils.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 LazyLogModule sUpdateLog("updatedriver");
+// Some other file in our unified batch might have defined LOG already.
+#ifdef LOG
+#  undef LOG
+#endif
+#define LOG(args) MOZ_LOG(sUpdateLog, mozilla::LogLevel::Debug, args)
+
+#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 MOZ_UNANNOTATED("nsUpdateDriver SetupMacCommandLine");
+
+  nsresult rv = NS_DispatchToMainThread(NS_NewRunnableFunction(
+      "UpdateDriverSetupMacCommandLine",
+      [&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.
+  CVStatus status =
+      MonitorAutoLock(monitor).Wait(TimeDuration::FromSeconds(60));
+  if (status == CVStatus::Timeout) {
+    LOG(("Update driver timed out waiting for SetupMacCommandLine\n"));
+  }
+}
+#endif
+
+static nsresult GetCurrentWorkingDir(nsACString& aOutPath) {
+  // Cannot use NS_GetSpecialDirectory because XPCOM is not yet initialized.
+  // This code is duplicated from xpcom/io/SpecialSystemDirectory.cpp:
+
+  aOutPath.Truncate();
+
+#if defined(XP_WIN)
+  wchar_t wpath[MAX_PATH];
+  if (!_wgetcwd(wpath, ArrayLength(wpath))) {
+    return NS_ERROR_FAILURE;
+  }
+  CopyUTF16toUTF8(nsDependentString(wpath), aOutPath);
+#else
+  char path[MAXPATHLEN];
+  if (!getcwd(path, ArrayLength(path))) {
+    return NS_ERROR_FAILURE;
+  }
+  aOutPath = path;
+#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));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = parentDir1->GetParent(getter_AddRefs(parentDir2));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = parentDir2->GetNativePath(installDirPath);
+  NS_ENSURE_SUCCESS(rv, rv);
+#elif XP_WIN
+  nsAutoString installDirPathW;
+  rv = appDir->GetPath(installDirPathW);
+  NS_ENSURE_SUCCESS(rv, rv);
+  CopyUTF16toUTF8(installDirPathW, installDirPath);
+#else
+  rv = appDir->GetNativePath(installDirPath);
+  NS_ENSURE_SUCCESS(rv, rv);
+#endif
+  return NS_OK;
+}
+
+static bool GetFile(nsIFile* dir, const nsACString& 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 = file;
+  return true;
+}
+
+static bool GetStatusFile(nsIFile* dir, nsCOMPtr<nsIFile>& result) {
+  return GetFile(dir, "update.status"_ns, result);
+}
+
+/**
+ * Get the contents of the update.status file when the update.status file can
+ * be opened with read and write access. The reason it is opened for both read
+ * and write is to prevent trying to update when the user doesn't have write
+ * access to the update directory.
+ *
+ * @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_RDWR, 0660, &fd);
+  if (NS_FAILED(rv)) {
+    return false;
+  }
+
+  const int32_t n = PR_Read(fd, buf, Size);
+  PR_Close(fd);
+
+  return (n >= 0);
+}
+
+enum UpdateStatus {
+  eNoUpdateAction,
+  ePendingUpdate,
+  ePendingService,
+  ePendingElevate,
+  eAppliedUpdate,
+  eAppliedService,
+};
+
+/**
+ * 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, "update.version"_ns, 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;
+  }
+
+  return mozilla::Version(appVersion) > buf;
+}
+
+/**
+ * Applies, switches, or stages an update.
+ *
+ * @param greDir       the GRE directory
+ * @param updateDir    the update root directory
+ * @param appDir       the application directory
+ * @param appArgc      the number of args passed to the application
+ * @param appArgv      the args passed to the application
+ *                     (used for restarting the application when necessary)
+ * @param restart      true when a restart is necessary.
+ * @param isStaged     true when the update has already been staged
+ * @param outpid (out) parameter holding the handle to the updater application
+ *                     when staging updates
+ */
+static void ApplyUpdate(nsIFile* greDir, nsIFile* updateDir, nsIFile* appDir,
+                        int appArgc, char** appArgv, bool restart,
+                        bool isStaged, ProcessType* outpid) {
+  // The following determines the update operation to perform.
+  // 1. When restart is false the update will be staged.
+  // 2. When restart is true and isStaged is false the update will apply the mar
+  //    file to the installation directory.
+  // 3. When restart is true and isStaged is true the update will switch the
+  //    staged update with the installation directory.
+
+  nsresult rv;
+
+  nsCOMPtr<nsIFile> updater;
+  nsAutoCString updaterPath;
+  nsAutoCString updateDirPath;
+#if defined(XP_WIN)
+  // Get an nsIFile reference for the updater in the installation dir.
+  if (!GetFile(greDir, nsLiteralCString(UPDATER_BIN), updater)) {
+    return;
+  }
+
+  // Get the path to the updater.
+  nsAutoString updaterPathW;
+  rv = updater->GetPath(updaterPathW);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  CopyUTF16toUTF8(updaterPathW, updaterPath);
+
+  // Get the path to the update dir.
+  nsAutoString updateDirPathW;
+  rv = updateDir->GetPath(updateDirPathW);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  CopyUTF16toUTF8(updateDirPathW, updateDirPath);
+#elif defined(XP_MACOSX)
+  // Get an nsIFile reference for the updater in the installation dir.
+  if (!GetFile(appDir, nsLiteralCString(UPDATER_APP), updater)) {
+    return;
+  }
+  rv = updater->AppendNative("Contents"_ns);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  rv = updater->AppendNative("MacOS"_ns);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  rv = updater->AppendNative(nsLiteralCString(UPDATER_BIN));
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  // Get the path to the updater.
+  rv = updater->GetNativePath(updaterPath);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  // Get the path to the update dir.
+  rv = updateDir->GetNativePath(updateDirPath);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+#else
+  // Get an nsIFile reference for the updater in the installation dir.
+  if (!GetFile(greDir, nsLiteralCString(UPDATER_BIN), updater)) {
+    return;
+  }
+
+  // Get the path to the updater.
+  rv = updater->GetNativePath(updaterPath);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  // Get the path to the update dir.
+  rv = updateDir->GetNativePath(updateDirPath);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+#endif
+
+  // appFilePath and workingDirPath are only used when the application will be
+  // restarted.
+  nsAutoCString appFilePath;
+  nsAutoCString workingDirPath;
+  if (restart) {
+    // Get the path to the current working directory.
+    rv = GetCurrentWorkingDir(workingDirPath);
+    if (NS_FAILED(rv)) {
+      return;
+    }
+
+    // Get the application file path used by the updater to restart the
+    // application after the update has finished.
+    nsCOMPtr<nsIFile> appFile;
+    XRE_GetBinaryPath(getter_AddRefs(appFile));
+    if (!appFile) {
+      return;
+    }
+
+#if defined(XP_WIN)
+    nsAutoString appFilePathW;
+    rv = appFile->GetPath(appFilePathW);
+    if (NS_FAILED(rv)) {
+      return;
+    }
+    CopyUTF16toUTF8(appFilePathW, appFilePath);
+#else
+    rv = appFile->GetNativePath(appFilePath);
+    if (NS_FAILED(rv)) {
+      return;
+    }
+#endif
+  }
+
+  // Get the installation directory path.
+  nsAutoCString installDirPath;
+  rv = GetInstallDirPath(appDir, installDirPath);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+#if defined(XP_MACOSX)
+  // If we're going to do a restart, we need to make sure the font registration
+  // thread has finished before this process exits (bug 1777332).
+  if (restart) {
+    gfxPlatformMac::WaitForFontRegistration();
+  }
+
+  // We need to detect whether elevation is required for this update. This can
+  // occur when an admin user installs the application, but another admin
+  // user attempts to update (see bug 394984).
+  // We only check if we need elevation if we are restarting. We don't attempt
+  // to stage if elevation is required. Staging happens without the user knowing
+  // about it, and we don't want to ask for elevation for seemingly no reason.
+  bool needElevation = false;
+  if (restart) {
+    needElevation = !IsRecursivelyWritable(installDirPath.get());
+    if (needElevation) {
+      // Normally we would check this via nsIAppStartup::wasSilentlyStarted,
+      // but nsIAppStartup isn't available yet.
+      char* mozAppSilentStart = PR_GetEnv("MOZ_APP_SILENT_START");
+      bool wasSilentlyStarted =
+          mozAppSilentStart && (strcmp(mozAppSilentStart, "") != 0);
+      if (wasSilentlyStarted) {
+        // Elevation always requires prompting for credentials on macOS. If we
+        // are trying to restart silently, we must not display UI such as this
+        // prompt.
+        // We make this check here rather than in the updater, because it is
+        // actually Firefox that shows the elevation prompt (via
+        // InstallPrivilegedHelper), not the updater.
+        return;
+      }
+    }
+  }
+#endif
+
+  nsAutoCString applyToDirPath;
+  nsCOMPtr<nsIFile> updatedDir;
+  if (restart && !isStaged) {
+    // The install directory is the same as the apply to directory.
+    applyToDirPath.Assign(installDirPath);
+  } else {
+    // Get the directory where the update is staged or will be staged. This is
+    // `updateDir` for macOS and `appDir` for all other platforms. macOS cannot
+    // stage updates inside the .app bundle (`appDir`) without breaking the code
+    // signature on the bundle, so we use `updateDir` instead.
+#if defined(XP_MACOSX)
+    if (!GetFile(updateDir, "Updated.app"_ns, updatedDir)) {
+#else
+    if (!GetFile(appDir, "updated"_ns, updatedDir)) {
+#endif
+      return;
+    }
+#if defined(XP_WIN)
+    nsAutoString applyToDirPathW;
+    rv = updatedDir->GetPath(applyToDirPathW);
+    if (NS_FAILED(rv)) {
+      return;
+    }
+    CopyUTF16toUTF8(applyToDirPathW, applyToDirPath);
+#else
+    rv = updatedDir->GetNativePath(applyToDirPath);
+#endif
+  }
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  if (restart && isStaged) {
+    // When the update should already be staged make sure that the updated
+    // directory exists.
+    bool updatedDirExists = false;
+    if (NS_FAILED(updatedDir->Exists(&updatedDirExists)) || !updatedDirExists) {
+      return;
+    }
+  }
+
+  // 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 to pass to
+  // the updater.
+  nsAutoCString pid;
+  if (restart) {
+#if defined(XP_UNIX) & !defined(XP_MACOSX)
+    // When execv is used for an update that requires a restart 0 is passed
+    // which is ignored by the updater.
+    pid.AssignLiteral("0");
+#else
+    pid.AppendInt((int32_t)getpid());
+#endif
+    if (isStaged) {
+      // Append a special token to the PID in order to inform the updater that
+      // it should replace install with the updated directory.
+      pid.AppendLiteral("/replace");
+    }
+  } else {
+    // Signal the updater application that it should stage the update.
+    pid.AssignLiteral("-1");
+  }
+
+  int argc = 5;
+  if (restart) {
+    argc = appArgc + 6;
+    if (gRestartedByOS) {
+      argc += 1;
+    }
+  }
+  char** argv = static_cast<char**>(malloc((argc + 1) * sizeof(char*)));
+  if (!argv) {
+    return;
+  }
+  argv[0] = (char*)updaterPath.get();
+  argv[1] = (char*)updateDirPath.get();
+  argv[2] = (char*)installDirPath.get();
+  argv[3] = (char*)applyToDirPath.get();
+  argv[4] = (char*)pid.get();
+  if (restart && appArgc) {
+    argv[5] = (char*)workingDirPath.get();
+    argv[6] = (char*)appFilePath.get();
+    for (int i = 1; i < appArgc; ++i) {
+      argv[6 + i] = appArgv[i];
+    }
+    if (gRestartedByOS) {
+      // We haven't truly started up, restore this argument so that we will have
+      // it upon restart.
+      argv[6 + appArgc] = const_cast<char*>("-os-restarted");
+    }
+  }
+  argv[argc] = nullptr;
+
+  if (restart && gSafeMode) {
+    PR_SetEnv("MOZ_SAFE_MODE_RESTART=1");
+  }
+
+  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) {
+    int execResult = execv(updaterPath.get(), argv);
+    free(argv);
+    exit(execResult);
+  }
+  *outpid = fork();
+  if (*outpid == -1) {
+    free(argv);
+    return;
+  }
+  if (*outpid == 0) {
+    int execResult = execv(updaterPath.get(), argv);
+    free(argv);
+    exit(execResult);
+  }
+#elif defined(XP_WIN)
+  if (isStaged) {
+    // Launch the updater to replace the installation with the staged updated.
+    if (!WinLaunchChild(updaterPathW.get(), argc, argv)) {
+      free(argv);
+      return;
+    }
+  } else {
+    // Launch the updater to either stage or apply an update.
+    if (!WinLaunchChild(updaterPathW.get(), argc, argv, nullptr, outpid)) {
+      free(argv);
+      return;
+    }
+  }
+#elif defined(XP_MACOSX)
+UpdateDriverSetupMacCommandLine(argc, argv, restart);
+if (restart && needElevation) {
+  bool hasLaunched = LaunchElevatedUpdate(argc, argv, outpid);
+  free(argv);
+  if (!hasLaunched) {
+    LOG(("Failed to launch elevated update!"));
+    exit(1);
+  }
+  exit(0);
+}
+
+if (isStaged) {
+  // Launch the updater to replace the installation with the staged updated.
+  LaunchChildMac(argc, argv);
+} else {
+  // Launch the updater to either stage or apply an update.
+  LaunchChildMac(argc, argv, outpid);
+}
+#else
+if (isStaged) {
+  // Launch the updater to replace the installation with the staged updated.
+  PR_CreateProcessDetached(updaterPath.get(), argv, nullptr, nullptr);
+} else {
+  // Launch the updater to either stage or apply an update.
+  *outpid = PR_CreateProcess(updaterPath.get(), argv, nullptr, nullptr);
+}
+#endif
+  free(argv);
+  if (restart) {
+    exit(0);
+  }
+}
+
+#if !defined(XP_WIN)
+/**
+ * Wait briefly to see if a process terminates, then return true if it has.
+ *
+ * (Not implemented on Windows, where HandleWatcher is used instead.)
+ */
+static bool ProcessHasTerminated(ProcessType pt) {
+#  if defined(XP_MACOSX)
+  // We're waiting for the process to terminate in LaunchChildMac.
+  return true;
+#  elif defined(XP_UNIX)
+  int exitStatus;
+  pid_t exited = waitpid(pt, &exitStatus, WNOHANG);
+  if (exited == 0) {
+    // Process is still running.
+    sleep(1);
+    return false;
+  }
+  if (exited == -1) {
+    LOG(("Error while checking if the updater process is finished"));
+    // This shouldn't happen, but if it does, the updater process is lost to us,
+    // so the best we can do is pretend that it's exited.
+    return true;
+  }
+  // If we get here, the process has exited; make sure it exited normally.
+  if (WIFEXITED(exitStatus) && (WEXITSTATUS(exitStatus) != 0)) {
+    LOG(("Error while running the updater process, check update.log"));
+  }
+  return true;
+#  else
+  // No way to have a non-blocking implementation on these platforms,
+  // because we're using NSPR and it only provides a blocking wait.
+  int32_t exitCode;
+  PR_WaitProcess(pt, &exitCode);
+  if (exitCode != 0) {
+    LOG(("Error while running the updater process, check update.log"));
+  }
+  return true;
+#  endif
+}
+#endif
+
+nsresult ProcessUpdates(nsIFile* greDir, nsIFile* appDir, nsIFile* updRootDir,
+                        int argc, char** argv, const char* appVersion,
+                        bool restart, ProcessType* pid) {
+  nsresult rv;
+
+#ifdef XP_WIN
+  // If we're in a package, we know any updates that we find are not for us.
+  if (mozilla::widget::WinUtils::HasPackageIdentity()) {
+    return NS_OK;
+  }
+#endif
+
+  nsCOMPtr<nsIFile> updatesDir;
+  rv = updRootDir->Clone(getter_AddRefs(updatesDir));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = updatesDir->AppendNative("updates"_ns);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = updatesDir->AppendNative("0"_ns);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Return early since there isn't a valid update when the update application
+  // version file doesn't exist or if the update's application version is less
+  // than the current application version. The cleanup of the update will happen
+  // during post update processing in nsUpdateService.js.
+  nsCOMPtr<nsIFile> versionFile;
+  if (!GetVersionFile(updatesDir, versionFile) ||
+      IsOlderVersion(versionFile, appVersion)) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIFile> statusFile;
+  UpdateStatus status = GetUpdateStatus(updatesDir, statusFile);
+  switch (status) {
+    case ePendingUpdate:
+    case ePendingService: {
+      ApplyUpdate(greDir, updatesDir, appDir, argc, argv, restart, false, pid);
+      break;
+    }
+    case eAppliedUpdate:
+    case eAppliedService:
+      // An update was staged and needs to be switched so the updated
+      // application is used.
+      ApplyUpdate(greDir, updatesDir, appDir, argc, argv, restart, true, pid);
+      break;
+    case ePendingElevate:
+      // No action should be performed since the user hasn't opted into
+      // elevating for the update so continue application startup.
+    case eNoUpdateAction:
+      // We don't need to do any special processing here, we'll just continue to
+      // startup the application.
+      break;
+  }
+
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(nsUpdateProcessor, nsIUpdateProcessor)
+
+nsUpdateProcessor::nsUpdateProcessor() : mUpdaterPID(0) {}
+
+#ifdef XP_WIN
+nsUpdateProcessor::~nsUpdateProcessor() { mProcessWatcher.Stop(); }
+#else
+nsUpdateProcessor::~nsUpdateProcessor() = default;
+#endif
+
+NS_IMETHODIMP
+nsUpdateProcessor::ProcessUpdate() {
+  nsresult rv;
+
+  nsCOMPtr<nsIProperties> ds =
+      do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> exeFile;
+  rv = ds->Get(XRE_EXECUTABLE_FILE, NS_GET_IID(nsIFile),
+               getter_AddRefs(exeFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> appDir;
+  rv = exeFile->GetParent(getter_AddRefs(appDir));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> greDir;
+  rv = ds->Get(NS_GRE_DIR, NS_GET_IID(nsIFile), getter_AddRefs(greDir));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> updRoot;
+  rv = ds->Get(XRE_UPDATE_ROOT_DIR, NS_GET_IID(nsIFile),
+               getter_AddRefs(updRoot));
+  NS_ASSERTION(NS_SUCCEEDED(rv), "Can't get the UpdRootD dir");
+
+  // XRE_UPDATE_ROOT_DIR should not fail but if it does fallback to the
+  // application directory just to be safe.
+  if (NS_FAILED(rv)) {
+    rv = appDir->Clone(getter_AddRefs(updRoot));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  nsCOMPtr<nsIXULAppInfo> appInfo =
+      do_GetService("@mozilla.org/xre/app-info;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoCString appVersion;
+  rv = appInfo->GetVersion(appVersion);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Copy the parameters to the StagedUpdateInfo structure shared with the
+  // worker thread.
+  mInfo.mGREDir = greDir;
+  mInfo.mAppDir = appDir;
+  mInfo.mUpdateRoot = updRoot;
+  mInfo.mArgc = 0;
+  mInfo.mArgv = nullptr;
+  mInfo.mAppVersion = appVersion;
+
+  MOZ_ASSERT(NS_IsMainThread(), "not main thread");
+  nsCOMPtr<nsIRunnable> r =
+      NewRunnableMethod("nsUpdateProcessor::StartStagedUpdate", this,
+                        &nsUpdateProcessor::StartStagedUpdate);
+  return NS_NewNamedThread("UpdateProcessor", getter_AddRefs(mWorkerThread), r);
+}
+
+void nsUpdateProcessor::StartStagedUpdate() {
+  MOZ_ASSERT(!NS_IsMainThread(), "main thread");
+
+  // If we fail to launch the updater process or its monitor for some reason, we
+  // need to shut down the worker thread, as there isn't anything more for us to
+  // do.
+  auto onExitStopThread = mozilla::MakeScopeExit([&] {
+    nsresult rv = NS_DispatchToMainThread(
+        NewRunnableMethod("nsUpdateProcessor::ShutdownWorkerThread", this,
+                          &nsUpdateProcessor::ShutdownWorkerThread));
+    NS_ENSURE_SUCCESS_VOID(rv);
+  });
+
+  // Launch updater. (We do this on a worker thread to avoid blocking the main
+  // thread with file I/O.)
+  nsresult rv = ProcessUpdates(mInfo.mGREDir, mInfo.mAppDir, mInfo.mUpdateRoot,
+                               mInfo.mArgc, mInfo.mArgv,
+                               mInfo.mAppVersion.get(), false, &mUpdaterPID);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(sUpdateLog, mozilla::LogLevel::Error,
+            ("could not start updater process: %s", GetStaticErrorName(rv)));
+    return;
+  }
+
+  if (!mUpdaterPID) {
+    // not an error
+    MOZ_LOG(sUpdateLog, mozilla::LogLevel::Verbose,
+            ("ProcessUpdates() indicated nothing to do"));
+    return;
+  }
+
+#ifdef WIN32
+  // Set up a HandleWatcher to report to the main thread when we're done.
+  RefPtr<nsIThread> mainThread;
+  NS_GetMainThread(getter_AddRefs(mainThread));
+  mProcessWatcher.Watch(mUpdaterPID, mainThread,
+                        NewRunnableMethod("nsUpdateProcessor::UpdateDone", this,
+                                          &nsUpdateProcessor::UpdateDone));
+
+// On Windows, that's all we need the worker thread for. Let
+// `onExitStopThread` shut us down.
+#else
+  // Monitor the state of the updater process while it is staging an update.
+  rv = NS_DispatchToCurrentThread(
+      NewRunnableMethod("nsUpdateProcessor::WaitForProcess", this,
+                        &nsUpdateProcessor::WaitForProcess));
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(sUpdateLog, mozilla::LogLevel::Error,
+            ("could not start updater process poll: error %s",
+             GetStaticErrorName(rv)));
+    return;
+  }
+
+  // Leave the worker thread alive to run WaitForProcess. Either it or its
+  // successors will be responsible for shutting down the worker thread.
+  onExitStopThread.release();
+#endif
+}
+
+void nsUpdateProcessor::ShutdownWorkerThread() {
+  MOZ_ASSERT(NS_IsMainThread(), "not main thread");
+  mWorkerThread->Shutdown();
+  mWorkerThread = nullptr;
+}
+
+#ifndef WIN32
+void nsUpdateProcessor::WaitForProcess() {
+  MOZ_ASSERT(!NS_IsMainThread(), "main thread");
+  if (ProcessHasTerminated(mUpdaterPID)) {
+    NS_DispatchToMainThread(NewRunnableMethod(
+        "nsUpdateProcessor::UpdateDone", this, &nsUpdateProcessor::UpdateDone));
+  } else {
+    NS_DispatchToCurrentThread(
+        NewRunnableMethod("nsUpdateProcessor::WaitForProcess", this,
+                          &nsUpdateProcessor::WaitForProcess));
+  }
+}
+#endif
+
+void nsUpdateProcessor::UpdateDone() {
+  MOZ_ASSERT(NS_IsMainThread(), "not main thread");
+
+  nsCOMPtr<nsIUpdateManager> um =
+      do_GetService("@mozilla.org/updates/update-manager;1");
+  if (um) {
+    // This completes asynchronously, but nothing else that we are doing in this
+    // function requires waiting for this to complete.
+    RefPtr<mozilla::dom::Promise> outPromise;
+    um->RefreshUpdateStatus(getter_AddRefs(outPromise));
+  }
+
+// On Windows, shutting down the worker thread is taken care of by another task.
+// (Which may not have run yet, so we can't assert.)
+#ifndef XP_WIN
+  ShutdownWorkerThread();
+#endif
+}
+
+NS_IMETHODIMP
+nsUpdateProcessor::GetServiceRegKeyExists(bool* aResult) {
+#ifndef XP_WIN
+  return NS_ERROR_NOT_IMPLEMENTED;
+#else   // #ifdef XP_WIN
+  nsCOMPtr<nsIProperties> dirSvc(
+      do_GetService("@mozilla.org/file/directory_service;1"));
+  NS_ENSURE_TRUE(dirSvc, NS_ERROR_SERVICE_NOT_AVAILABLE);
+
+  nsCOMPtr<nsIFile> installBin;
+  nsresult rv = dirSvc->Get(XRE_EXECUTABLE_FILE, NS_GET_IID(nsIFile),
+                            getter_AddRefs(installBin));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> installDir;
+  rv = installBin->GetParent(getter_AddRefs(installDir));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoString installPath;
+  rv = installDir->GetPath(installPath);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  wchar_t maintenanceServiceKey[MAX_PATH + 1];
+  BOOL success = CalculateRegistryPathFromFilePath(
+      PromiseFlatString(installPath).get(), maintenanceServiceKey);
+  NS_ENSURE_TRUE(success, NS_ERROR_FAILURE);
+
+  HKEY regHandle;
+  LSTATUS ls = RegOpenKeyExW(HKEY_LOCAL_MACHINE, maintenanceServiceKey, 0,
+                             KEY_QUERY_VALUE | KEY_WOW64_64KEY, &regHandle);
+  if (ls == ERROR_SUCCESS) {
+    RegCloseKey(regHandle);
+    *aResult = true;
+    return NS_OK;
+  }
+  if (ls == ERROR_FILE_NOT_FOUND) {
+    *aResult = false;
+    return NS_OK;
+  }
+  // We got an error we weren't expecting reading the registry.
+  return NS_ERROR_NOT_AVAILABLE;
+#endif  // #ifdef XP_WIN
+}