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ext2.cpp

/***************************************************************************
 *   Copyright (C) 2008,2009 by Volker Lanz <vl@fidra.de>                  *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
 ***************************************************************************/

#include "fs/ext2.h"

#include "util/externalcommand.h"
#include "util/capacity.h"

#include <QString>
#include <QRegExp>

namespace FS
{
      FileSystem::SupportType ext2::m_GetUsed = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_GetLabel = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_Create = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_Grow = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_Shrink = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_Move = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_Check = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_Copy = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_Backup = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_SetLabel = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_UpdateUUID = FileSystem::SupportNone;
      FileSystem::SupportType ext2::m_GetUUID = FileSystem::SupportNone;

      ext2::ext2(qint64 firstsector, qint64 lastsector, qint64 sectorsused, const QString& label, FileSystem::Type t) :
            FileSystem(firstsector, lastsector, sectorsused, label, t)
      {
      }

      void ext2::init()
      {
            m_GetUsed = findExternal("dumpe2fs") ? SupportExternal : SupportNone;
            m_SetLabel = m_GetLabel = findExternal("e2label") ? SupportExternal : SupportNone;
            m_Create = findExternal("mkfs.ext2") ? SupportExternal : SupportNone;
            m_Check = findExternal("e2fsck", QStringList() << "-V") ? SupportExternal : SupportNone;
            m_UpdateUUID = findExternal("tune2fs") ? SupportExternal : SupportNone;
            m_Grow = (m_Check != SupportNone && findExternal("resize2fs")) ? SupportExternal : SupportNone;
            m_Shrink = m_GetUsed != SupportNone ? SupportExternal : SupportNone;
            m_Copy = (m_Check != SupportNone) ? SupportInternal : SupportNone;
            m_Move = (m_Check != SupportNone) ? SupportInternal : SupportNone;
            m_Backup = SupportInternal;
            m_GetUUID = findExternal("vol_id") ? SupportExternal : SupportNone;
      }

00063       qint64 ext2::maxCapacity() const
      {
             return Capacity::unitFactor(Capacity::Byte, Capacity::EiB);
      }

00068       qint64 ext2::readUsedCapacity(const QString& deviceNode) const
      {
            ExternalCommand cmd("dumpe2fs", QStringList() << "-h" << deviceNode);

            if (cmd.run())
            {
                  qint64 blockCount = -1;
                  QRegExp rxBlockCount("Block count:\\s*(\\d+)");

                  if (rxBlockCount.indexIn(cmd.output()) != -1)
                        blockCount = rxBlockCount.cap(1).toLongLong();

                  qint64 freeBlocks = -1;
                  QRegExp rxFreeBlocks("Free blocks:\\s*(\\d+)");

                  if (rxFreeBlocks.indexIn(cmd.output()) != -1)
                        freeBlocks = rxFreeBlocks.cap(1).toLongLong();

                  qint64 blockSize = -1;
                  QRegExp rxBlockSize("Block size:\\s*(\\d+)");

                  if (rxBlockSize.indexIn(cmd.output()) != -1)
                        blockSize = rxBlockSize.cap(1).toLongLong();

                  if (blockCount > -1 && freeBlocks > -1 && blockSize > -1)
                        return (blockCount - freeBlocks) * blockSize;
            }

            return -1;
      }

00099       QString ext2::readLabel(const QString& deviceNode) const
      {
            ExternalCommand cmd("e2label", QStringList() << deviceNode);
            return cmd.run() ? cmd.output().simplified() : QString();
      }

00105       bool ext2::check(Report& report, const QString& deviceNode) const
      {
            ExternalCommand cmd(report, "e2fsck", QStringList() << "-f" << "-y" << "-v" << deviceNode);
            return cmd.run(-1) && (cmd.exitCode() == 0 || cmd.exitCode() == 1 || cmd.exitCode() == 2 || cmd.exitCode() == 256);
      }

00111       bool ext2::create(Report& report, const QString& deviceNode) const
      {
            return ExternalCommand(report, "mkfs.ext2", QStringList() << deviceNode).run(-1);
      }

00116       bool ext2::resize(Report& report, const QString& deviceNode, qint64 length) const
      {
            const QString len = QString::number(length / 512) + 's';
            ExternalCommand cmd(report, "resize2fs", QStringList() << deviceNode << len);
            return cmd.run(-1) && cmd.exitCode() == 0;
      }

00123       bool ext2::writeLabel(Report& report, const QString& deviceNode, const QString& newLabel)
      {
            return ExternalCommand(report, "e2label", QStringList() << deviceNode << newLabel).run(-1);
      }

00128       bool ext2::updateUUID(Report& report, const QString& deviceNode) const
      {
            return ExternalCommand(report, "tune2fs", QStringList() << "-U" << "random" << deviceNode).run(-1);
      }
}

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