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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing
**
** This file is part of the Qt Build Suite.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms and
** conditions see http://www.qt.io/terms-conditions. For further information
** use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#include "buildgraphlocker.h"
#include "error.h"
#include <logging/translator.h>
#include <QDir>
#include <QFileInfo>
#include <QString>
namespace qbs {
namespace Internal {
BuildGraphLocker::BuildGraphLocker(const QString &buildGraphFilePath)
: m_lockFile(buildGraphFilePath + QLatin1String(".lock"))
{
const QString buildDir = QFileInfo(buildGraphFilePath).absolutePath();
if (!QDir::root().mkpath(buildDir)) {
throw ErrorInfo(Tr::tr("Cannot lock build graph file '%1': Failed to create directory.")
.arg(buildGraphFilePath));
}
m_lockFile.setStaleLockTime(0);
int attemptsToGetInfo = 0;
do {
if (m_lockFile.tryLock(250))
return;
switch (m_lockFile.error()) {
case QLockFile::LockFailedError: {
qint64 pid;
QString hostName;
QString appName;
if (m_lockFile.getLockInfo(&pid, &hostName, &appName)) {
throw ErrorInfo(Tr::tr("Cannot lock build graph file '%1': "
"Already locked by '%2' (PID %3).")
.arg(buildGraphFilePath, appName).arg(pid));
}
break;
}
case QLockFile::PermissionError:
throw ErrorInfo(Tr::tr("Cannot lock build graph file '%1': Permission denied.")
.arg(buildGraphFilePath));
case QLockFile::UnknownError:
case QLockFile::NoError:
throw ErrorInfo(Tr::tr("Cannot lock build graph file '%1' (reason unknown).")
.arg(buildGraphFilePath));
}
} while (++attemptsToGetInfo < 10);
// This very unlikely case arises if tryLock() repeatedly returns LockFailedError
// with the subsequent getLockInfo() failing as well.
throw ErrorInfo(Tr::tr("Cannot lock build graph file '%1' (reason unknown).")
.arg(buildGraphFilePath));
}
BuildGraphLocker::~BuildGraphLocker()
{
m_lockFile.unlock();
}
} // namespace Internal
} // namespace qbs
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