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01 google updateres
chrome的自动更新组件叫google updateres。默认安装会在C:\Program Files (x86)\Google\Update目录下。
C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
C:\Program Files (x86)\Google\Update\1.3.33.23\*目录下有很多更新必须的文件。
google updateres是由独立于chromium的团队维护的。
chromium代码最直接和这部分相关的是菜单中的关于菜单。代码位置：
src\chrome\browser\ui\webui\help\
默认chromimu使用的是
version_updater_basic.cc
version_updater_basic.h
google updateres使用的是
version_updater_win.cc
version_updater_win.h
追查VersionUpdaterWin的 BeginUpdateCheck 函数，既可以找到全部线索。
如果完全开启应该在gn gen 命令中加入 is_chrome_branded=true。自己没这么测试过。
如果想在chromium编译模式下is_chrome_branded=false(默认值)开启chromium代码中和google updateres相关的代码。牵涉到的修改文件较多。
02 71.0.3578.49版本中 google updateres相关部分。
修改一下涉及到的内容，基本可以调试google updateres相关的chromium内部的代码逻辑。
最终，会在chrome\browser\google\google_update_win.cc的CreateGoogleUpdate3WebClass函数中因调用src\google_update\google_update_idl.idl中定义的GoogleUpdate3WebUserClass而失败。
如果要完全模拟google updateres，需要自己打造一个update.exe，并且实现src\google_update\google_update_idl.idl的com接口。
下面牵涉的修改内容，仅仅是通过性测试，可以方便调试google_update相关的chromium内部代码逻辑。其实不修改光看看也差不多，因为代码量不大，主要集中在google_update_win.cc和version_updater_win.cc两个文件中。
另外 upgrade_detector.cc和upgrade_detector_impl.cc也有很大借鉴作用。
主要相关源码文件
# 需要修改或注释代码的文件
src/chrome/browser/BUILD.gn
chrome/browser/ui/BUILD.gn
chrome/app/settings_strings.grdp
chrome\browser\component_updater\third_party_module_list_component_installer_win.cc
chrome\browser\conflicts\incompatible_applications_updater_win.cc
chrome\browser\conflicts\module_blacklist_cache_updater_win.cc
chrome\browser\conflicts\uninstall_application_win.cc
chrome\browser\first_run\upgrade_util_win.cc
chrome\browser\google\google_update_win.cc
chrome\browser\upgrade_detector\upgrade_detector_impl.cc
chrome\browser\upgrade_detector\upgrade_detector_impl.h
chrome\common\chrome_features.h
chrome\common\pref_names.h
# 下面的未必需要修改
chrome\install_static\chromium_install_modes.cc
chrome\install_static\install_modes.cc
chrome\installer\mini_installer\mini_installer_constants.cc
chrome\installer\util\util_constants.cc
chrome\installer\setup\setup_main.cc
02.01 src/chrome/browser/BUILD.gn
#if (is_chrome_branded) {
if (!is_chrome_branded) {
deps += [
":conflicts_module_list_proto",
"//chrome_elf:sha1",
"//chrome_elf:third_party_shared_defines",
"//google_update",
]
libs += [ "msi.lib" ]
sources += [
"component_updater/third_party_module_list_component_installer_win.cc",
"component_updater/third_party_module_list_component_installer_win.h",
"conflicts/incompatible_applications_updater_win.cc",
"conflicts/incompatible_applications_updater_win.h",
"conflicts/installed_applications_win.cc",
"conflicts/installed_applications_win.h",
"conflicts/module_blacklist_cache_updater_win.cc",
"conflicts/module_blacklist_cache_updater_win.h",
"conflicts/module_blacklist_cache_util_win.cc",
"conflicts/module_blacklist_cache_util_win.h",
"conflicts/module_list_filter_win.cc",
"conflicts/module_list_filter_win.h",
"conflicts/module_load_attempt_log_listener_win.cc",
"conflicts/module_load_attempt_log_listener_win.h",
"conflicts/msi_util_win.cc",
"conflicts/msi_util_win.h",
"conflicts/registry_key_watcher_win.cc",
"conflicts/registry_key_watcher_win.h",
"conflicts/third_party_conflicts_manager_win.cc",
"conflicts/third_party_conflicts_manager_win.h",
"conflicts/token_util_win.cc",
"conflicts/token_util_win.h",
"conflicts/uninstall_application_win.cc",
"conflicts/uninstall_application_win.h",
"google/google_update_win.cc",
"google/google_update_win.h",
02.02chrome/browser/ui/BUILD.gn
#if (is_chrome_branded) {
if (!is_chrome_branded) {
sources += [
"webui/help/version_updater_win.cc",
"webui/help/version_updater_win.h",
"webui/settings/incompatible_applications_handler_win.cc",
"webui/settings/incompatible_applications_handler_win.h",
]
deps += [ "//google_update" ]
deps += [
"//google_update"
]
02.03 chrome/app/settings_strings.grdp
<!-- if expr="is_win and _google_chrome" -->
<if expr="is_win">
<message name="IDS_SETTINGS_INCOMPATIBLE_APPLICATIONS_RESET_CARD_TITLE" desc="The title of the Incompatible Applications section of the settings.">
Update or remove incompatible applications
</message>
<message name="IDS_SETTINGS_INCOMPATIBLE_APPLICATIONS_SUBPAGE_SUBTITLE" desc="The subtitle shown in the subpage for incompatible applications.">
{NUM_APPLICATIONS, plural,
=1 {This application could prevent Chrome from working properly.}
other {These applications could prevent Chrome from working properly.}}
</message>
02.04 chrome\browser\component_updater\third_party_module_list_component_installer_win.cc
//constexpr char kComponentId[] = "ehgidpndbllacpjalkiimkbadgjfnnmc";
//// Forward the notification to the ThirdPartyConflictsManager on the current
//// (UI) thread. The manager is responsible for the work of actually loading
//// the module list, etc, on background threads.
//ThirdPartyConflictsManager* manager =
// ModuleDatabase::GetInstance()->third_party_conflicts_manager();
//if (!manager)
// return;
//manager->LoadModuleList(GetModuleListPath(install_dir));
//// Check if component is needed. The ThirdPartyConflictsManager instance only
//// exists when the module list is needed.
//if (!ModuleDatabase::GetInstance()->third_party_conflicts_manager())
// return;
//auto installer = base::MakeRefCounted<ComponentInstaller>(
// std::make_unique<ThirdPartyModuleListComponentInstallerPolicy>());
//installer->Register(
// component_update_service, base::BindOnce([]() {
// // Notify the ThirdPartyConflictsManager.
// ThirdPartyConflictsManager* manager =
// ModuleDatabase::GetInstance()->third_party_conflicts_manager();
// if (!manager)
// return;
// manager->OnModuleListComponentRegistered(kComponentId);
// }));
02.05 chrome\browser\conflicts\incompatible_applications_updater_win.cc
//return base::win::GetVersion() >= base::win::VERSION_WIN10 &&
// ModuleDatabase::IsThirdPartyBlockingPolicyEnabled() &&
// base::FeatureList::IsEnabled(
// features::kIncompatibleApplicationsWarning);
return false;
02.06 chrome\browser\conflicts\module_blacklist_cache_updater_win.cc
//// The ThirdPartyConflictsManager can exist even if the blocking is disabled
//// because that class also controls the warning of incompatible applications.
//return ModuleDatabase::GetInstance() &&
// ModuleDatabase::GetInstance()->third_party_conflicts_manager() &&
// base::FeatureList::IsEnabled(features::kThirdPartyModulesBlocking);
return false;
02.07 chrome\browser\conflicts\uninstall_application_win.cc
//// Launch the Apps & Features settings page regardless of the |result| of the
//// initialization. An initialization failure only means that the application
//// will not be written into the search box.
//ShellUtil::LaunchUninstallAppsSettings();
02.08 chrome\browser\first_run\upgrade_util_win.cc
//#if defined(GOOGLE_CHROME_BUILD)
//#endif // GOOGLE_CHROME_BUILD
02.09 chrome\browser\google\google_update_win.cc
GoogleUpdateErrorCode CanUpdateCurrentChrome函数里面的路径
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// 这两个路径需要根据自己的调试环境调整下
base::FilePath user_exe_path = installer::GetChromeInstallPath(false);
base::FilePath machine_exe_path = installer::GetChromeInstallPath(true);
02.10 chrome\browser\upgrade_detector\upgrade_detector_impl.cc
//#if defined(GOOGLE_CHROME_BUILD)
//#endif // defined(GOOGLE_CHROME_BUILD)
#if defined(OS_WIN)// && defined(GOOGLE_CHROME_BUILD)
02.11 chrome\browser\upgrade_detector\upgrade_detector_impl.h
#if defined(OS_WIN)// && defined(GOOGLE_CHROME_BUILD)
02.12 chrome\common\chrome_features.h
#if defined(OS_WIN) //&& defined(GOOGLE_CHROME_BUILD)
02.13 chrome\common\pref_names.h
//#if defined(GOOGLE_CHROME_BUILD)
//#endif // defined(GOOGLE_CHROME_BUILD)
02.14 未必修改，但需要关注的内容
chrome\install_static\chromium_install_modes.cc
chrome\install_static\install_modes.cc
chrome\installer\mini_installer\mini_installer_constants.cc
chrome\installer\util\util_constants.cc
chrome\installer\setup\setup_main.cc