Return Windows error code when create-process fails.

chrome/installer/mini_installer/configuration.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/installer/mini_installer/configuration.h"
 
 #include <shellapi.h>  // NOLINT
 
 #include "chrome/installer/mini_installer/appid.h"
+#include "chrome/installer/mini_installer/mini_installer_constants.h"
 #include "chrome/installer/mini_installer/mini_installer_resource.h"
+#include "chrome/installer/mini_installer/regkey.h"
 
 namespace mini_installer {
 
 Configuration::Configuration() : args_(NULL) {
   Clear();
 }
 
 Configuration::~Configuration() {
   Clear();
 }
 
+// When multi_install is true, we are potentially:
+// 1. Performing a multi-install of some product(s) on a clean machine.
+//    Neither the product(s) nor the multi-installer will have a
+//    ClientState key in the registry, so there is no key to be modified.
+// 2. Upgrading an existing multi-install.  The multi-installer will have
+//    a ClientState key in the registry.  Only it need be modified.
+// 3. Migrating a single-install into a multi-install.  The product will
+//    have a ClientState key in the registry.  Only it need be modified.
+// To handle all cases, we inspect the product's ClientState to see if it
+// exists and its "ap" value does not contain "-multi".  This is case 3,
+// so we modify the product's ClientState.  Otherwise, we check the
+// multi-installer's ClientState and modify it if it exists.
+// TODO(bcwhite): Write a unit test for this that uses registry virtualization.
+void Configuration::SetChromeAppGuid() {
+  const HKEY root_key =
+      is_system_level_ ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+  const wchar_t* app_guid =
+      has_chrome_frame_ ?
+          google_update::kChromeFrameAppGuid :
+          is_side_by_side_ ? google_update::kSxSAppGuid
+                           : google_update::kAppGuid;
+
+  // This is the value for single-install and case 3.
+  chrome_app_guid_ = app_guid;
+
+  if (is_multi_install_) {
+    ValueString value;
+    LONG ret = ERROR_SUCCESS;
+    if (ReadClientStateRegistryValue(root_key, app_guid, &ret, value)) {
+      // The product has a client state key.  See if it's a single-install.
+      if (ret == ERROR_FILE_NOT_FOUND ||
+          (ret == ERROR_SUCCESS &&
+           !FindTagInStr(value.get(), kMultiInstallTag, NULL))) {
+        // yes -- case 3: use the existing key.
+        return;
+      }
+    }
+    // error, case 1, or case 2: modify the multi-installer's key.
+    chrome_app_guid_ = google_update::kMultiInstallAppGuid;
+  }
+}
+
+bool Configuration::ReadClientStateRegistryValue(
+    const HKEY root_key, const wchar_t* app_guid,
+    LONG* retval, ValueString& value) {
+  RegKey key;
+  if (!OpenClientStateKey(root_key, app_guid, KEY_QUERY_VALUE, &key))
+    return false;
+  *retval = key.ReadSZValue(kApRegistryValue, value.get(), value.capacity());
+  return true;
+}
+
 const wchar_t* Configuration::program() const {
   return args_ == NULL || argument_count_ < 1 ? NULL : args_[0];
 }
 
 void Configuration::Clear() {
   if (args_ != NULL) {
     ::LocalFree(args_);
     args_ = NULL;
   }
   chrome_app_guid_ = google_update::kAppGuid;
   command_line_ = NULL;
   operation_ = INSTALL_PRODUCT;
   argument_count_ = 0;
   has_chrome_ = false;
   has_chrome_frame_ = false;
   is_multi_install_ = false;
   is_system_level_ = false;
+  is_side_by_side_ = false;
   previous_version_ = NULL;
 }
 
 bool Configuration::Initialize(HMODULE module) {
   Clear();
   ReadResources(module);
   return ParseCommandLine(::GetCommandLine());
 }
 
 // |command_line| is shared with this instance in the sense that this
 // instance may refer to it at will throughout its lifetime, yet it will
 // not release it.
 bool Configuration::ParseCommandLine(const wchar_t* command_line) {
   command_line_ = command_line;
   args_ = ::CommandLineToArgvW(command_line_, &argument_count_);
   if (args_ != NULL) {
     for (int i = 1; i < argument_count_; ++i) {
       if (0 == ::lstrcmpi(args_[i], L"--chrome-sxs"))
-        chrome_app_guid_ = google_update::kSxSAppGuid;
+        is_side_by_side_ = true;
       else if (0 == ::lstrcmpi(args_[i], L"--chrome"))
         has_chrome_ = true;
       else if (0 == ::lstrcmpi(args_[i], L"--chrome-frame"))
         has_chrome_frame_ = true;
       else if (0 == ::lstrcmpi(args_[i], L"--multi-install"))
         is_multi_install_ = true;
       else if (0 == ::lstrcmpi(args_[i], L"--system-level"))
         is_system_level_ = true;
       else if (0 == ::lstrcmpi(args_[i], L"--cleanup"))
         operation_ = CLEANUP;
     }
 
-    // Single-install defaults to Chrome.
-    if (!is_multi_install_)
+    SetChromeAppGuid();
+    if (!is_multi_install_) {
       has_chrome_ = !has_chrome_frame_;
+    }
   }
 
   return args_ != NULL;
 }
 
 void Configuration::ReadResources(HMODULE module) {
   HRSRC resource_info_block =
       FindResource(module, MAKEINTRESOURCE(ID_PREVIOUS_VERSION), RT_RCDATA);
   if (!resource_info_block)
     return;
@@ skipping 15 matching lines @@
   size_t version_len = version_size / sizeof(wchar_t);
 
   // The string must be terminated.
   if (version_string[version_len - 1])
     return;
 
   previous_version_ = version_string;
 }
 
 }  // namespace mini_installer