Move app_host target from c/b/extensions into src/apps.

chrome/browser/extensions/app_host/update.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/extensions/app_host/update.h"
-
-#include <windows.h>
-#include "base/command_line.h"
-#include "base/file_version_info.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/process_util.h"
-#include "base/string16.h"
-#include "base/string_util.h"
-#include "base/version.h"
-#include "base/win/registry.h"
-#include "chrome/installer/launcher_support/chrome_launcher_support.h"
-
-namespace app_host {
-
-namespace {
-
-// TODO(huangs) Refactor the constants: http://crbug.com/148538
-const wchar_t kGoogleRegClientsKey[] = L"Software\\Google\\Update\\Clients\\";
-
-// Copied from util_constants.cc.
-const char kMultiInstall[] = "multi-install";
-const char kChromeAppHost[] = "app-host";
-const char kVerboseLogging[] = "verbose-logging";
-
-// Copied from google_update_constants.cc.
-const wchar_t kRegVersionField[] = L"pv";
-
-// Copied from chrome_appid.cc.
-const wchar_t kBinariesAppGuid[] = L"{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}";
-
-// Copied from google_chrome_distribution.cc.
-const wchar_t kBrowserAppGuid[] = L"{8A69D345-D564-463c-AFF1-A69D9E530F96}";
-
-// Fetches the version of the App Host, directly from the image's version
-// resource.
-Version GetAppHostVersion() {
-  scoped_ptr<FileVersionInfo> version_info(
-      FileVersionInfo::CreateFileVersionInfoForCurrentModule());
-  Version app_host_version(WideToASCII(version_info->product_version()));
-  DCHECK(app_host_version.IsValid());
-  return app_host_version;
-}
-
-// Fetches the app version ("pv" entry) of a Google product from the
-// system-level registry, given the app GUID ("{###...###}").
-Version GetAppVersionFromRegistry(const wchar_t* app_guid) {
-  HKEY root_key = HKEY_LOCAL_MACHINE;
-  string16 client_key(kGoogleRegClientsKey);
-  client_key.append(app_guid);
-  base::win::RegKey reg_key;
-  string16 version_str;
-  if ((reg_key.Open(root_key, client_key.c_str(),
-                    KEY_QUERY_VALUE) == ERROR_SUCCESS) &&
-      (reg_key.ReadValue(kRegVersionField, &version_str) == ERROR_SUCCESS)) {
-    return Version(WideToASCII(version_str));
-  }
-  return Version();
-}
-
-// Calls setup.exe to update App Host, using the system-level setup.exe.
-bool LaunchAppHostUpdate() {
-  // Get the path to the setup.exe.
-  base::FilePath setup_exe(
-      chrome_launcher_support::GetSetupExeForInstallationLevel(
-          chrome_launcher_support::SYSTEM_LEVEL_INSTALLATION));
-  if (setup_exe.empty()) {
-    LOG(ERROR) << "Failed to find setup.exe";
-    return false;
-  }
-  CommandLine cmd_line(setup_exe);
-  cmd_line.AppendSwitch(kMultiInstall);
-  cmd_line.AppendSwitch(kChromeAppHost);
-  cmd_line.AppendSwitch(kVerboseLogging);
-  LOG(INFO) << "Launching: " << cmd_line.GetCommandLineString();
-  return base::LaunchProcess(cmd_line, base::LaunchOptions(), NULL);
-}
-
-}  // namespace
-
-void EnsureAppHostUpToDate() {
-  // Check version from Chrome Binaries first, then Chrome (all system-level).
-  Version new_version(GetAppVersionFromRegistry(kBinariesAppGuid));
-  if (!new_version.IsValid())
-    new_version = GetAppVersionFromRegistry(kBrowserAppGuid);
-  if (!new_version.IsValid())
-    return;  // Not an error: System-level Chrome might not be installed.
-  Version app_host_version(GetAppHostVersion());
-  if (app_host_version.CompareTo(new_version) < 0) {
-    LOG(INFO) << "Updating App Launcher from " << app_host_version.GetString()
-              << " to " << new_version.GetString();
-    if (!LaunchAppHostUpdate())
-      LOG(ERROR) << "Failed to launch App Launcher update.";
-  }
-}
-
-}  // namespace app_host