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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing
**
** This file is part of Qbs.
**
** 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 "hostosinfo.h"
#include "processutils.h"
#include "version.h"
#include <logging/translator.h>
#include <QDir>
#include <QDirIterator>
#include <QFileInfo>
#include <QString>
namespace qbs {
namespace Internal {
static bool hasQtBug45497()
{
return Version::fromString(QLatin1String(qVersion())) < Version(5, 5, 1);
}
static bool hasQtBug53392()
{
return HostOsInfo::isWindowsHost()
&& Version::fromString(QLatin1String(qVersion())) < Version(5, 6, 2);
}
BuildGraphLocker::BuildGraphLocker(const QString &buildGraphFilePath, const Logger &logger)
: m_lockFile(buildGraphFilePath + QLatin1String(".lock"))
, m_logger(logger)
{
const QString buildDir = QFileInfo(buildGraphFilePath).absolutePath();
rememberCreatedDirectories(buildDir);
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)) {
if ((!hasQtBug45497() && !hasQtBug53392()) || appName == processNameByPid(pid)) {
throw ErrorInfo(Tr::tr("Cannot lock build graph file '%1': "
"Already locked by '%2' (PID %3).")
.arg(buildGraphFilePath, appName).arg(pid));
}
// The process id was reused by some other process.
m_logger.qbsInfo() << Tr::tr("Removing stale lock file.");
m_lockFile.removeStaleLockFile();
}
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();
removeEmptyCreatedDirectories();
}
void BuildGraphLocker::rememberCreatedDirectories(const QString &buildDir)
{
QString parentDir = buildDir;
while (!QFileInfo::exists(parentDir)) {
m_createdParentDirs.enqueue(parentDir);
parentDir = QDir::cleanPath(parentDir + QLatin1String("/.."));
}
}
void BuildGraphLocker::removeEmptyCreatedDirectories()
{
QDir root = QDir::root();
while (!m_createdParentDirs.isEmpty()) {
const QString parentDir = m_createdParentDirs.dequeue();
QDirIterator it(parentDir, QDir::AllEntries | QDir::NoDotAndDotDot | QDir::System,
QDirIterator::Subdirectories);
if (it.hasNext())
break;
if (!root.rmdir(parentDir)) {
m_logger.printWarning(ErrorInfo(Tr::tr("Failed to remove empty directory '%1'.")
.arg(parentDir)));
}
}
}
} // namespace Internal
} // namespace qbs
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