Add support for --multi-install to mini_installer, fixed a memory leak, and r...

chrome/installer/mini_installer/mini_installer.cc

 // Copyright (c) 2006-2009 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.
 
 // mini_installer.exe is the first exe that is run when chrome is being
 // installed or upgraded. It is designed to be extremely small (~5KB with no
 // extra resources linked) and it has two main jobs:
 //   1) unpack the resources (possibly decompressing some)
 //   2) run the real installer (setup.exe) with appropiate flags.
 //
@@ skipping 109 matching lines @@
     return false;
 
   for (int i = 0; start_str[i] != L'\0'; ++i) {
     if (!EqualASCIICharI(str[i], start_str[i]))
       return false;
   }
 
   return true;
 }
 
+// Helper function to read a REG_SZ value from the registry. Returns
+// ERROR_SUCCESS, ERROR_FILE_NOT_FOUND, ERROR_MORE_DATA, or some other error.
+// |size| is the size of |value| in wchar_t units.  |value| is guaranteed to be
+// null-terminated when ERROR_SUCCESS is returned.
+LONG ReadValueFromRegistry(HKEY key, const wchar_t* value_name, wchar_t* value,

[tommi (sloooow) - chröme, 2010/12/16 06:32:25]

nice

+                           size_t size) {
+  DWORD type;
+  DWORD byte_length = static_cast<DWORD>(size * sizeof(wchar_t));
+  LONG result = ::RegQueryValueEx(key, value_name, NULL, &type,
+                                  reinterpret_cast<LPBYTE>(value),

[tommi (sloooow) - chröme, 2010/12/16 06:32:25]

nit: styleguide prefers BYTE* over LPBYTE iirc

[grt (UTC plus 2), 2010/12/16 17:36:34]

Done.

+                                  &byte_length);
+  if (result == ERROR_SUCCESS) {
+    if (type != REG_SZ) {
+      result = ERROR_NOT_SUPPORTED;
+    } else if (byte_length == 0) {
+      *value = L'\0';
+    } else if (value[byte_length/sizeof(wchar_t) - 1] != L'\0') {
+      if (byte_length / sizeof(wchar_t) < size)

[tommi (sloooow) - chröme, 2010/12/16 06:32:25]

nit: use () for readability

[grt (UTC plus 2), 2010/12/16 17:36:34]

Done.

+        value[byte_length / sizeof(wchar_t)] = L'\0';
+      else
+        result = ERROR_MORE_DATA;
+    }
+  }
+  return result;
+}
+
 // Helper function to read a value from registry. Returns true if value
 // is read successfully and stored in parameter value. Returns false otherwise.
+// |size| is measured in wchar_t units.
 bool ReadValueFromRegistry(HKEY root_key, const wchar_t *sub_key,
                            const wchar_t *value_name, wchar_t *value,
                            size_t size) {
+  bool result = false;
   HKEY key;
-  if ((::RegOpenKeyEx(root_key, sub_key, NULL,
-                      KEY_READ, &key) == ERROR_SUCCESS) &&
-      (::RegQueryValueEx(key, value_name, NULL, NULL,
-                         reinterpret_cast<LPBYTE>(value),
-                         reinterpret_cast<LPDWORD>(&size)) == ERROR_SUCCESS)) {
+  if (::RegOpenKeyEx(root_key, sub_key, NULL,
+                     KEY_READ, &key) == ERROR_SUCCESS) {
+    result =
+        (ReadValueFromRegistry(key, value_name, value, size) == ERROR_SUCCESS);
     ::RegCloseKey(key);
-    return true;
   }
-  return false;
+  return result;
 }
 
-// This function sets the flag in registry to indicate that Google Update
-// should try full installer next time. If the current installer works, this
-// flag is cleared by setup.exe at the end of install. The flag will by default
-// be written to HKCU, but if --system-level is included in the command line,
-// it will be written to HKLM instead.
-void SetFullInstallerFlag() {
-  HKEY key;
-  wchar_t ap_registry_key[128];
+// Opens the Google Update ClientState key for a product.
+bool OpenClientStateKey(HKEY root_key, const wchar_t* app_guid, REGSAM access,
+                        HKEY* key) {
+  wchar_t client_state_key[128];
+
+  return SafeStrCopy(client_state_key, _countof(client_state_key),
+                     kApRegistryKeyBase) &&
+         SafeStrCat(client_state_key, _countof(client_state_key), app_guid) &&
+         (::RegOpenKeyEx(root_key, client_state_key, NULL, access, key) ==
+              ERROR_SUCCESS);
+}
+
+// TODO(grt): Write a unit test for this that uses registry virtualization.
+void SetFullInstallerFlagHelper(int args_num, const wchar_t* const* args) {
+  bool multi_install = false;
+  HKEY key = NULL;
   const wchar_t* app_guid = google_update::kAppGuid;
   HKEY root_key = HKEY_CURRENT_USER;
+  wchar_t value[128];
+  LONG ret;
 
-  int args_num;
-  wchar_t* cmd_line = ::GetCommandLine();
-  wchar_t** args = ::CommandLineToArgvW(cmd_line, &args_num);
   for (int i = 1; i < args_num; ++i) {
     if (0 == ::lstrcmpi(args[i], L"--chrome-sxs"))
       app_guid = google_update::kSxSAppGuid;
     else if (0 == ::lstrcmpi(args[i], L"--chrome-frame"))
       app_guid = google_update::kChromeFrameAppGuid;
+    else if (0 == ::lstrcmpi(args[i], L"--multi-install"))
+      multi_install = true;
     else if (0 == ::lstrcmpi(args[i], L"--system-level"))
       root_key = HKEY_LOCAL_MACHINE;
   }
 
-  if (!SafeStrCopy(ap_registry_key, _countof(ap_registry_key),
-                   kApRegistryKeyBase) ||
-      !SafeStrCat(ap_registry_key, _countof(ap_registry_key),
-                  app_guid)) {
-    return;
+  // 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 nothing to be done.
+  // 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.
+  if (multi_install) {
+    if (OpenClientStateKey(root_key, app_guid, KEY_READ | KEY_SET_VALUE,
+                           &key)) {
+      // The app is installed.  See if it's a single-install.
+      ret = ReadValueFromRegistry(key, kApRegistryValueName, value,
+                                  _countof(value));
+      if (ret != ERROR_FILE_NOT_FOUND &&
+          (ret != ERROR_SUCCESS || StrStr(value, kMultiInstallTag) != NULL)) {
+        // Error or case 2: add "-full" to the multi-installer's value.
+        ::RegCloseKey(key);

[tommi (sloooow) - chröme, 2010/12/16 06:32:25]

it's almost worth it to write a poor man's RegKey to take care of all the exit
points

[grt (UTC plus 2), 2010/12/16 17:36:34]

I was thinking along the same lines in the shower this morning.  Consider it
done.

+        key = NULL;
+        app_guid = google_update::kMultiInstallAppGuid;
+      }  // else case 3: add "-full" to this value.
+    } else {
+      // case 1 or 2: add "-full" to the multi-installer's value.
+      key = NULL;
+      app_guid = google_update::kMultiInstallAppGuid;
+    }
   }
-  if (::RegOpenKeyEx(root_key, ap_registry_key, NULL,
-                     KEY_READ | KEY_SET_VALUE, &key) != ERROR_SUCCESS)
-    return;
 
-  wchar_t value[128];
-  size_t size = _countof(value);
-  size_t buf_size = size;
-  LONG ret = ::RegQueryValueEx(key, kApRegistryValueName, NULL, NULL,
-                               reinterpret_cast<LPBYTE>(value),
-                               reinterpret_cast<LPDWORD>(&size));
+  if (key == NULL) {
+    if (!OpenClientStateKey(root_key, app_guid, KEY_READ | KEY_SET_VALUE, &key))
+      return;
+
+    ret = ReadValueFromRegistry(key, kApRegistryValueName, value,
+                                _countof(value));
+  }
 
   // The conditions below are handling two cases:
   // 1. When ap key is present, we want to make sure it doesn't already end
   //    in -full and then append -full to it.
   // 2. When ap key is missing, we are going to create it with value -full.
   if ((ret == ERROR_SUCCESS) || (ret == ERROR_FILE_NOT_FOUND)) {
     if (ret == ERROR_FILE_NOT_FOUND)
       value[0] = L'\0';
 
     if (!StrEndsWith(value, kFullInstallerSuffix) &&
-        (SafeStrCat(value, buf_size, kFullInstallerSuffix)))
+        (SafeStrCat(value, _countof(value), kFullInstallerSuffix)))
       ::RegSetValueEx(key, kApRegistryValueName, 0, REG_SZ,
                       reinterpret_cast<LPBYTE>(value),
-                      lstrlen(value) * sizeof(wchar_t));
+                      (lstrlen(value) + 1) * sizeof(wchar_t));
   }
 
   ::RegCloseKey(key);
 }
 
+// This function sets the flag in registry to indicate that Google Update
+// should try full installer next time. If the current installer works, this
+// flag is cleared by setup.exe at the end of install. The flag will by default
+// be written to HKCU, but if --system-level is included in the command line,
+// it will be written to HKLM instead.
+void SetFullInstallerFlag() {
+  int args_num;
+  wchar_t* cmd_line = ::GetCommandLine();
+  wchar_t** args = ::CommandLineToArgvW(cmd_line, &args_num);
+
+  SetFullInstallerFlagHelper(args_num, args);
+
+  ::LocalFree(args);
+}
+
 // Gets the setup.exe path from Registry by looking the value of Uninstall
 // string, strips the arguments for uninstall and returns only the full path
-// to setup.exe.
+// to setup.exe.  |size| is measured in wchar_t units.
 bool GetSetupExePathFromRegistry(wchar_t *path, size_t size) {
   if (!ReadValueFromRegistry(HKEY_CURRENT_USER, kUninstallRegistryKey,
       kUninstallRegistryValueName, path, size)) {
     if (!ReadValueFromRegistry(HKEY_LOCAL_MACHINE, kUninstallRegistryKey,
         kUninstallRegistryValueName, path, size)) {
       return false;
     }
   }
   wchar_t *tmp = StrStr(path, L" --");
   if (tmp) {
@@ skipping 323 matching lines @@
   wchar_t archive_path[MAX_PATH] = {0};
   wchar_t setup_path[MAX_PATH] = {0};
   if (!UnpackBinaryResources(module, base_path, archive_path, MAX_PATH,
                              setup_path, MAX_PATH))
     return 102;
 
   int exit_code = 103;
   if (!RunSetup(archive_path, setup_path, &exit_code))
     return exit_code;
 
-  wchar_t value[4];
+  wchar_t value[2];
   if ((!ReadValueFromRegistry(HKEY_CURRENT_USER, kCleanupRegistryKey,
-                              kCleanupRegistryValueName, value, 4)) ||
+                              kCleanupRegistryValueName, value,
+                              _countof(value))) ||
       (value[0] != L'0'))
     DeleteExtractedFiles(base_path, archive_path, setup_path);
 
   return exit_code;
 }
 }  // namespace mini_installer
 
 
 int MainEntryPoint() {
   int result = mini_installer::WMain(::GetModuleHandle(NULL));
   ::ExitProcess(result);
 }