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/**************************************************************************
*
* Copyright 2014 Canonical Ltd.
* Copyright 2014 Carlos J Mazieri <carlos.mazieri@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* File: QTrashDir.cpp
* Date: 06/02/2014
*/
#include "qtrashdir.h"
#include "qtrashutilinfo.h"
#include <QFileInfo>
#include <QDir>
#include <QDebug>
#include <QStandardPaths>
#if defined(Q_OS_UNIX)
# include <sys/statvfs.h>
# include <unistd.h>
# include <sys/types.h>
# include <sys/stat.h>
#endif
QTrashDir::QTrashDir() : m_userId(::getuid())
{
}
bool QTrashDir::validate(const QString &trashDir, bool create) const
{
bool ret = false;
QFileInfo info(trashDir);
if (!info.exists() && create)
{
createUserDir(info.absoluteFilePath());
}
if (checkUserDirPermissions(trashDir))
{
QString files(QTrashUtilInfo::filesTrashDir(trashDir));
QString info(QTrashUtilInfo::infoTrashDir(trashDir));
if ( (checkUserDirPermissions(files) || (create && createUserDir(files))) &&
(checkUserDirPermissions(info) || (create && createUserDir(info)))
)
{
ret = true;
}
}
return ret;
}
bool QTrashDir::checkUserDirPermissions(const QString &dir) const
{
QFileInfo f(dir);
bool ret = false;
if ( f.isDir() && !f.isSymLink() )
{
QFile::Permissions permissions = f.permissions();
bool owner = permissions & (QFile::ReadOwner | QFile::WriteOwner | QFile::ExeOwner);
bool group = permissions & (QFile::ReadGroup | QFile::WriteGroup | QFile::ExeGroup);
bool others = permissions & (QFile::ReadOther | QFile::WriteOther | QFile::ExeOther);
if (owner && !group && !others)
{
ret = true;
}
}
return ret;
}
bool QTrashDir::createUserDir(const QString &dir) const
{
QFileInfo d(dir);
bool ret = false;
if ((d.exists() && d.isDir()) || QDir().mkpath(dir))
{
ret = QFile(dir).setPermissions(QFile::ReadOwner |
QFile::WriteOwner |
QFile::ExeOwner);
}
return ret;
}
QString QTrashDir::homeTrash() const
{
QString homeTrash;
// If $XDG_DATA_HOME is either not set or empty, a default equal to
//$HOME/.local/share should be used.
QString xdg_home = QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation);
if (!xdg_home.isEmpty())
{
QString tmp(xdg_home+ QDir::separator() + QLatin1String("Trash"));
if (validate(tmp,true))
{
homeTrash = tmp;
}
}
return homeTrash;
}
/*!
* \brief QTrashDir::isSharedTopDirWithStickBit
* \param mountPoint this is the root (mount point directory)
* \return true it the mount point has a .Trash folder with stick bit set
*/
bool QTrashDir::isMountPointSharedWithStickBit(const QString &mountPoint) const
{
bool ret = false;;
QFileInfo trashDir(mountPoint + QDir::separator() + ".Trash");
#if DEBUG_MESSAGES
qDebug() << Q_FUNC_INFO << trashDir.absoluteFilePath() ;
#endif
if (trashDir.isDir() && !trashDir.isSymLink() && trashDir.isWritable())
{
//QFileInfo does not work for stick bit, using stat() instead
struct stat vfs;
if (::stat(QFile::encodeName(trashDir.absoluteFilePath()).constData(), &vfs) == 0)
{
ret = vfs.st_mode & S_ISVTX;
#if DEBUG_MESSAGES
qDebug() << Q_FUNC_INFO << trashDir.absoluteFilePath()
<< QString::number(vfs.st_mode, 8)
<< QString::number(vfs.st_mode, 16) << "ret" << ret;
#endif
}
}
return ret;
}
QString QTrashDir::getMountPoint(const QString &fileOrDir) const
{
unsigned long fileOrDirFsId = 0xffff;
unsigned long parentFsId = 0xffff;
struct statvfs vfs;
QString ret;
QFileInfo finfo(fileOrDir);
if ( finfo.exists() &&
::statvfs( QFile::encodeName(finfo.canonicalFilePath()).constData(), &vfs) == 0 )
{
parentFsId = fileOrDirFsId = vfs.f_fsid;
while (!finfo.isRoot() && fileOrDirFsId == parentFsId)
{
finfo.setFile(finfo.canonicalPath());
if ( ::statvfs( QFile::encodeName(finfo.canonicalPath()).constData(), &vfs) == 0 )
{
parentFsId = vfs.f_fsid;
}
}
ret = finfo.canonicalFilePath();
}
return ret;
}
/*!
* \brief QTrashDir::mountedPoints()
* \return a list of mounted directories from /etc/mtab
*
* \note
*/
QStringList QTrashDir::mountedPoints() const
{
QStringList mountPoints;
QFile mtab(QLatin1String("/etc/mtab"));
if (mtab.open(QFile::ReadOnly))
{
QString line = mtab.readLine();
while (!line.isEmpty())
{
QStringList items = line.split(QLatin1Char(' '));
if (items.count() > 2)
{
if (items.first() != (QLatin1String("proc")) &&
items.first() != (QLatin1String("sysfs")) &&
items.first() != (QLatin1String("none")) &&
items.first() != (QLatin1String("udev")) &&
items.first() != (QLatin1String("devpts")) &&
items.first() != (QLatin1String("tmpfs")) &&
items.first() != (QLatin1String("systemd"))
)
{
mountPoints.append(items.at(1));
}
}
line = mtab.readLine();
}
mtab.close();
::qSort(mountPoints);
}
#if DEBUG_MESSAGES
qDebug() << Q_FUNC_INFO << "mount points:" << mountPoints;
#endif
return mountPoints;
}
QStringList QTrashDir::allTrashes() const
{
QStringList trashes;
QString trashDir(homeTrash());
if (!trashDir.isEmpty())
{
trashes.append(trashDir);
}
QStringList mounted = mountedPoints();
foreach(const QString& mp, mounted)
{
trashDir = getSharedTopTrashDir(mp);
if (!trashDir.isEmpty())
{
trashes.append(trashDir);
}
trashDir = getSingleTopTrashDir(mp);
if (!trashDir.isEmpty())
{
trashes.append(trashDir);
}
}
#if DEBUG_MESSAGES
qDebug() << Q_FUNC_INFO << "trashes:" << trashes;
#endif
return trashes;
}
QString QTrashDir::getSuitableTopTrashDir(const QString &mountPoint) const
{
QString trashDir(getSharedTopTrashDir(mountPoint));
//if previous shared mountPoint/Trash/$uid failed
//try mountPoint/Trash-$uid
if (trashDir.isEmpty())
{
trashDir = getSingleTopTrashDir(mountPoint, true);
}
return trashDir;
}
QString QTrashDir::getSharedTopTrashDir(const QString &mountPoint) const
{
QString trashDir;
QString userTrash(mountPoint + QDir::separator() +
QLatin1Literal(".Trash"));
if (isMountPointSharedWithStickBit(mountPoint))
{
QString userInsideSharedTrash(userTrash +
QDir::separator() +
QString::number(m_userId)
);
if (validate(userInsideSharedTrash, true))
{
trashDir = userInsideSharedTrash;
}
}
return trashDir;
}
QString QTrashDir::getSingleTopTrashDir(const QString &mountPoint, bool create ) const
{
QString trashDir;
QString userTrash(mountPoint + QDir::separator() +
QLatin1Literal(".Trash"));
userTrash += QLatin1Char('-') + QString::number(m_userId);
if (validate(userTrash, create))
{
trashDir = userTrash;
}
return trashDir;
}
QString QTrashDir::suitableTrash(const QString &fullPathName) const
{
QFileInfo fi(fullPathName);
QString trashDir;
QString homeTrashDir(homeTrash());
if (fi.exists())
{
//first case file/dir is under other directory than Home
if (!fi.canonicalPath().startsWith(QDir::homePath()))
{
QString topDir = getMountPoint(fi.canonicalFilePath());
trashDir = getSuitableTopTrashDir(topDir);
//check if the file/dir intended to be moved into Trash does belong to Trash Dir itself
if (!trashDir.isEmpty() &&
fi.canonicalFilePath().startsWith(trashDir)
)
{
trashDir.clear();
}
}
//check AGAIN if the file/dir intended to be moved into Trash does belong to Trash Dir itself
if ( trashDir.isEmpty() &&
fi.canonicalFilePath() != QDir::homePath() &&
!fi.canonicalFilePath().startsWith(homeTrashDir)
)
{
trashDir = homeTrashDir;
}
}
return trashDir;
}
bool QTrashDir::suitableTrash(const QString &fullPathName, QTrashUtilInfo &fullInfo) const
{
fullInfo.setInfo(suitableTrash(fullPathName), fullPathName);
return fullInfo.isValid();
}
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