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/**************************************************************************
**
** This file is part of Installer Framework
**
** Copyright (c) 2011-2012 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**************************************************************************/
#include "environmentvariablesoperation.h"
#include "qsettingswrapper.h"
#include <stdlib.h>
#include "environment.h"
#ifdef Q_OS_WIN
# include <windows.h>
#endif
using namespace QInstaller;
using namespace KDUpdater;
/*
TRANSLATOR QInstaller::EnvironmentVariablesOperation
*/
EnvironmentVariableOperation::EnvironmentVariableOperation()
{
setName(QLatin1String("EnvironmentVariable"));
}
void EnvironmentVariableOperation::backup()
{
}
#ifdef Q_OS_WIN
static bool broadcastChange() {
// Use SendMessageTimeout to Broadcast a message to the whole system to update settings of all
// running applications. This is needed to activate the changes done above without logout+login.
// Note that cmd.exe does not respond to any WM_SETTINGCHANGE messages...
DWORD aResult = 0;
LRESULT sendresult = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE,
0, (LPARAM) "Environment", SMTO_BLOCK | SMTO_ABORTIFHUNG, 5000, &aResult);
if (sendresult == 0 || aResult != 0) {
qWarning("Failed to broadcast a WM_SETTINGCHANGE message\n");
return false;
}
return true;
}
#endif
namespace {
template <typename SettingsType>
UpdateOperation::Error writeSetting(const QString ®Path,
const QString &name,
const QString &value,
QString *errorString,
QString *oldValue)
{
oldValue->clear();
SettingsType registry(regPath, QSettingsWrapper::NativeFormat);
if (!registry.isWritable()) {
*errorString = QObject::tr("Registry path %1 is not writable").arg(regPath);
return UpdateOperation::UserDefinedError;
}
// remember old value for undo
*oldValue = registry.value(name).toString();
// set the new value
registry.setValue(name, value);
registry.sync();
if (registry.status() != QSettingsWrapper::NoError) {
*errorString = QObject::tr("Could not write to registry path %1").arg(regPath);
return UpdateOperation::UserDefinedError;
}
return UpdateOperation::NoError;
}
template <typename SettingsType>
UpdateOperation::Error undoSetting(const QString ®Path,
const QString &name,
const QString &value,
const QString &oldValue,
QString *errorString)
{
QString actual;
{
SettingsType registry(regPath, QSettingsWrapper::NativeFormat);
actual = registry.value(name).toString();
}
if (actual != value) //key changed, don't undo
return UpdateOperation::UserDefinedError;
QString dontcare;
return writeSetting<SettingsType>(regPath, name, oldValue, errorString, &dontcare);
}
} // namespace
bool EnvironmentVariableOperation::performOperation()
{
if (arguments().count() < 2 || arguments().count() > 4) {
setError(InvalidArguments);
setErrorString(tr("Invalid arguments in %0: %1 arguments given, 2-3 expected.")
.arg(name()).arg(arguments().count()));
return false;
}
const QString name = arguments().at(0);
const QString value = arguments().at(1);
bool isPersistent = false;
#ifdef Q_OS_WIN
isPersistent = arguments().count() >= 3 ? arguments().at(2) == QLatin1String("true") : true;
const bool isSystemWide = arguments().count() >= 4 ? arguments().at(3) == QLatin1String("true") : false;
QString oldvalue;
if (isPersistent) {
const QString regPath = isSystemWide ? QLatin1String("HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet"
"\\Control\\Session Manager\\Environment") : QLatin1String("HKEY_CURRENT_USER\\Environment");
// write the name=value pair to the global environment
QString errorString;
Error err = NoError;
err = isSystemWide
? writeSetting<QSettingsWrapper>(regPath, name, value, &errorString, &oldvalue)
: writeSetting<QSettingsWrapper>(regPath, name, value, &errorString, &oldvalue);
if (err != NoError) {
setError(err);
setErrorString(errorString);
return false;
}
const bool bret = broadcastChange();
Q_UNUSED(bret); // this is not critical, so fall-through
setValue(QLatin1String("oldvalue"), oldvalue);
return true;
}
#endif
Q_ASSERT(!isPersistent);
Q_UNUSED(isPersistent)
setValue(QLatin1String("oldvalue"), Environment::instance().value(name));
Environment::instance().setTemporaryValue(name, value);
return true;
}
bool EnvironmentVariableOperation::undoOperation()
{
if (arguments().count() < 2 || arguments().count() > 4)
return false;
const QString name = arguments().at(0);
const QString value = arguments().at(1);
const QString oldvalue = this->value(QLatin1String("oldvalue")).toString();
#ifdef Q_OS_WIN
const bool isPersistent = arguments().count() >= 3 ? arguments().at(2) == QLatin1String("true") : true;
#else
const bool isPersistent = false;
#endif
if (!isPersistent) {
const QString actual = Environment::instance().value(name);
const bool doUndo = actual == value;
if (doUndo)
Environment::instance().setTemporaryValue(name, oldvalue);
return doUndo;
}
#ifdef Q_OS_WIN
const bool isSystemWide = arguments().count() >= 4 ? arguments().at(3) == QLatin1String("true") : false;
const QString regPath = isSystemWide ? QLatin1String("HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\"
"Control\\Session Manager\\Environment") : QLatin1String("HKEY_CURRENT_USER\\Environment");
QString errorString;
const Error err = isSystemWide
? undoSetting<QSettingsWrapper>(regPath, name, value, oldvalue, &errorString)
: undoSetting<QSettingsWrapper>(regPath, name, value, oldvalue, &errorString);
if (err != NoError) {
setError(err);
setErrorString(errorString);
return false;
}
#endif
return true;
}
bool EnvironmentVariableOperation::testOperation()
{
return true;
}
Operation *EnvironmentVariableOperation::clone() const
{
return new EnvironmentVariableOperation();
}
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