286 lines
8.8 KiB
C++
286 lines
8.8 KiB
C++
/*
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SPDX-FileCopyrightText: 2017-2020 Andrius Štikonas <andrius@stikonas.eu>
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SPDX-FileCopyrightText: 2019 Adriaan de Groot <groot@kde.org>
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SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include "core/fstab.h"
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#include "util/externalcommand.h"
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#include "util/report.h"
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#include <algorithm>
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#include <array>
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#if defined(Q_OS_LINUX)
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#include <blkid/blkid.h>
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#endif
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#include <QChar>
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#include <QDebug>
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#include <QFileInfo>
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#include <QRegularExpression>
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#include <QTemporaryFile>
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#include <QTextStream>
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static void parseFsSpec(const QString& m_fsSpec, FstabEntry::Type& m_entryType, QString& m_deviceNode);
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static QString findBlkIdDevice(const char *token, const QString& value);
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static void writeEntry(QTextStream& s, const FstabEntry& entry, std::array<unsigned int, 4> columnWidth);
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std::array<unsigned int, 4> fstabColumnWidth(const FstabEntryList& fstabEntries);
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struct FstabEntryPrivate
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{
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QString m_fsSpec;
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QString m_deviceNode;
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QString m_mountPoint;
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QString m_type;
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QStringList m_options;
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int m_dumpFreq;
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int m_passNumber;
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QString m_comment;
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FstabEntry::Type m_entryType;
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};
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FstabEntry::FstabEntry(const QString& fsSpec, const QString& mountPoint, const QString& type, const QString& options, int dumpFreq, int passNumber, const QString& comment) :
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d(std::make_unique<FstabEntryPrivate>())
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{
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d->m_fsSpec = fsSpec;
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d->m_mountPoint = mountPoint;
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d->m_type = type;
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d->m_dumpFreq = dumpFreq;
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d->m_passNumber = passNumber;
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d->m_comment = comment;
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d->m_options = options.split(QLatin1Char(','));
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d->m_options.removeAll(QStringLiteral("defaults"));
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parseFsSpec(d->m_fsSpec, d->m_entryType, d->m_deviceNode);
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}
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FstabEntryList readFstabEntries( const QString& fstabPath )
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{
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FstabEntryList fstabEntries;
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QFile fstabFile( fstabPath );
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if ( fstabFile.open( QIODevice::ReadOnly | QIODevice::Text ) )
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{
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const QStringList fstabLines = QString::fromLocal8Bit(fstabFile.readAll()).split( QLatin1Char('\n') );
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for ( const QString& rawLine : fstabLines )
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{
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QString line = rawLine.trimmed();
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if ( line.startsWith( QLatin1Char('#') ) || line.isEmpty()) {
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fstabEntries.push_back( { {}, {}, {}, {}, {}, {}, line } );
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continue;
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}
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QString comment = line.section( QLatin1Char('#'), 1 );
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QStringList splitLine = line.section( QLatin1Char('#'), 0, 0 ).split( QRegularExpression(QStringLiteral("[\\s]+")), Qt::SkipEmptyParts );
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// We now split the standard components of /etc/fstab entry:
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// (0) path, or UUID, or LABEL, etc,
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// (1) mount point,
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// (2) file system type,
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// (3) options,
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// (4) dump frequency (optional, defaults to 0), no comment is allowed if omitted,
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// (5) pass number (optional, defaults to 0), no comment is allowed if omitted,
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// (#) comment (optional).
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auto fsSpec = splitLine.at(0);
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auto mountPoint = splitLine.at(1);
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auto fsType = splitLine.at(2);
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auto options = splitLine.at(3);
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switch (splitLine.length()) {
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case 4:
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fstabEntries.push_back( {fsSpec, mountPoint, fsType, options } );
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break;
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case 5:
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fstabEntries.push_back( {fsSpec, mountPoint, fsType, options, splitLine.at(4).toInt() } );
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break;
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case 6:
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fstabEntries.push_back( {fsSpec, mountPoint, fsType, options, splitLine.at(4).toInt(), splitLine.at(5).toInt(), comment.isEmpty() ? QString() : QLatin1Char('#') + comment } );
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break;
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default:
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fstabEntries.push_back( { {}, {}, {}, {}, {}, {}, QLatin1Char('#') + line } );
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}
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}
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fstabFile.close();
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if (fstabEntries.back().entryType() == FstabEntry::Type::comment && fstabEntries.back().comment().isEmpty())
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fstabEntries.pop_back();
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}
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return fstabEntries;
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}
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void FstabEntry::setFsSpec(const QString& s)
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{
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d->m_fsSpec = s;
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parseFsSpec(d->m_fsSpec, d->m_entryType, d->m_deviceNode);
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}
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const QString& FstabEntry::fsSpec() const
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{
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return d->m_fsSpec;
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}
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const QString& FstabEntry::deviceNode() const
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{
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return d->m_deviceNode;
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}
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const QString& FstabEntry::mountPoint() const
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{
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return d->m_mountPoint;
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}
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const QString& FstabEntry::type() const
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{
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return d->m_type;
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}
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const QStringList& FstabEntry::options() const
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{
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return d->m_options;
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}
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const QString FstabEntry::optionsString() const
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{
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return options().size() > 0 ? options().join(QLatin1Char(',')) : QStringLiteral("defaults");
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}
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int FstabEntry::dumpFreq() const
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{
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return d->m_dumpFreq;
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}
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int FstabEntry::passNumber() const
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{
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return d->m_passNumber;
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}
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const QString& FstabEntry::comment() const
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{
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return d->m_comment;
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}
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FstabEntry::Type FstabEntry::entryType() const
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{
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return d->m_entryType;
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}
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void FstabEntry::setMountPoint(const QString& s)
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{
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d->m_mountPoint = s;
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}
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void FstabEntry::setOptions(const QStringList& s)
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{
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d->m_options = s;
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}
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void FstabEntry::setDumpFreq(int s)
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{
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d->m_dumpFreq = s;
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}
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void FstabEntry::setPassNumber(int s)
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{
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d->m_passNumber = s;
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}
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QStringList possibleMountPoints(const QString& deviceNode, const QString& fstabPath)
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{
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QStringList mountPoints;
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QString canonicalPath = QFileInfo(deviceNode).canonicalFilePath();
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const FstabEntryList fstabEntryList = readFstabEntries( fstabPath );
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for (const FstabEntry &entry : fstabEntryList)
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if (QFileInfo(entry.deviceNode()).canonicalFilePath() == canonicalPath)
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mountPoints.append(entry.mountPoint());
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return mountPoints;
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}
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static QString findBlkIdDevice(const char *token, const QString& value)
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{
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QString rval;
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#if defined(Q_OS_LINUX)
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if (char* c = blkid_evaluate_tag(token, value.toLocal8Bit().constData(), nullptr)) {
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rval = QString::fromLocal8Bit(c);
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free(c);
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}
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#else
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Q_UNUSED(token);
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Q_UNUSED(value);
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#endif
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return rval;
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}
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static void parseFsSpec(const QString& m_fsSpec, FstabEntry::Type& m_entryType, QString& m_deviceNode)
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{
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m_entryType = FstabEntry::Type::comment;
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if (m_fsSpec.startsWith(QStringLiteral("UUID="))) {
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m_entryType = FstabEntry::Type::uuid;
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m_deviceNode = findBlkIdDevice("UUID", QString(m_fsSpec).remove(QStringLiteral("UUID=")));
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} else if (m_fsSpec.startsWith(QStringLiteral("LABEL="))) {
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m_entryType = FstabEntry::Type::label;
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m_deviceNode = findBlkIdDevice("LABEL", QString(m_fsSpec).remove(QStringLiteral("LABEL=")));
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} else if (m_fsSpec.startsWith(QStringLiteral("PARTUUID="))) {
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m_entryType = FstabEntry::Type::uuid;
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m_deviceNode = findBlkIdDevice("PARTUUID", QString(m_fsSpec).remove(QStringLiteral("PARTUUID=")));
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} else if (m_fsSpec.startsWith(QStringLiteral("PARTLABEL="))) {
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m_entryType = FstabEntry::Type::label;
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m_deviceNode = findBlkIdDevice("PARTLABEL", QString(m_fsSpec).remove(QStringLiteral("PARTLABEL=")));
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} else if (m_fsSpec.startsWith(QStringLiteral("/"))) {
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m_entryType = FstabEntry::Type::deviceNode;
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m_deviceNode = m_fsSpec;
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}
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}
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// Used to nicely format fstab file
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std::array<unsigned int, 4> fstabColumnWidth(const FstabEntryList& fstabEntries)
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{
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std::array<unsigned int, 4> columnWidth;
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#define FIELD_WIDTH(x) 3 + std::max_element(fstabEntries.begin(), fstabEntries.end(), [](const FstabEntry& a, const FstabEntry& b) {return a.x().length() < b.x().length(); })->x().length();
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columnWidth[0] = FIELD_WIDTH(fsSpec);
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columnWidth[1] = FIELD_WIDTH(mountPoint);
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columnWidth[2] = FIELD_WIDTH(type);
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columnWidth[3] = FIELD_WIDTH(optionsString);
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return columnWidth;
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}
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static void writeEntry(QTextStream& s, const FstabEntry& entry, std::array<unsigned int, 4> columnWidth)
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{
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if (entry.entryType() == FstabEntry::Type::comment) {
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s << entry.comment() << "\n";
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return;
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}
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s.setFieldAlignment(QTextStream::AlignLeft);
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s.setFieldWidth(columnWidth[0]);
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s << entry.fsSpec()
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<< qSetFieldWidth(columnWidth[1]) << (entry.mountPoint().isEmpty() ? QStringLiteral("none") : entry.mountPoint())
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<< qSetFieldWidth(columnWidth[2]) << entry.type()
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<< qSetFieldWidth(columnWidth[3]) << entry.optionsString() << qSetFieldWidth(0)
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<< entry.dumpFreq() << " "
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<< entry.passNumber() << " "
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<< entry.comment() << "\n";
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}
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bool writeMountpoints(const FstabEntryList& fstabEntries, const QString& filename)
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{
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QString fstabContents;
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QTextStream out(&fstabContents);
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std::array<unsigned int, 4> columnWidth = fstabColumnWidth(fstabEntries);
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for (const auto &e : fstabEntries)
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writeEntry(out, e, columnWidth);
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ExternalCommand cmd;
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return cmd.createFile(fstabContents.toLocal8Bit(), filename);
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}
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