Fix parsing fstab mountpoints when they contain spaces or tabs.

If the name of the mount point contains spaces or tabs these
can be escaped as `\040' and '\011' respectively.

BUG: 428932

src/core/fstab.cpp

@@ -83,7 +83,7 @@ FstabEntryList readFstabEntries( const QString& fstabPath )
             // (5) pass number (optional, defaults to 0), no comment is allowed if omitted,
             // (#) comment (optional).
             auto fsSpec = splitLine.at(0);
-            auto mountPoint = splitLine.at(1);
+            auto mountPoint = unescapeSpaces(splitLine.at(1));
             auto fsType = splitLine.at(2);
             auto options = splitLine.at(3);
 
@@ -110,6 +110,22 @@ FstabEntryList readFstabEntries( const QString& fstabPath )
     return fstabEntries;
 }
 
+QString escapeSpaces(const QString& mountPoint)
+{
+    QString tmp = mountPoint;
+    tmp.replace(QStringLiteral(" "), QStringLiteral("\\040"));
+    tmp.replace(QStringLiteral("\t"), QStringLiteral("\\011"));
+    return tmp;
+}
+
+QString unescapeSpaces(const QString& mountPoint)
+{
+    QString tmp = mountPoint;
+    tmp.replace(QStringLiteral("\\040"), QStringLiteral(" "));
+    tmp.replace(QStringLiteral("\\011"), QStringLiteral("\t"));
+    return tmp;
+}
+
 void FstabEntry::setFsSpec(const QString& s)
 {
     d->m_fsSpec = s;
@@ -262,7 +278,7 @@ static void writeEntry(QTextStream& s, const FstabEntry& entry, std::array<unsig
     s.setFieldAlignment(QTextStream::AlignLeft);
     s.setFieldWidth(columnWidth[0]);
     s << entry.fsSpec()
-      << qSetFieldWidth(columnWidth[1]) << (entry.mountPoint().isEmpty() ? QStringLiteral("none") : entry.mountPoint())
+      << qSetFieldWidth(columnWidth[1]) << (entry.mountPoint().isEmpty() ? QStringLiteral("none") : escapeSpaces(entry.mountPoint()))
       << qSetFieldWidth(columnWidth[2]) << entry.type()
       << qSetFieldWidth(columnWidth[3]) << entry.optionsString() << qSetFieldWidth(0)
       << entry.dumpFreq() << " "

src/core/fstab.h

@@ -111,6 +111,9 @@ private:
 
 typedef QList<FstabEntry> FstabEntryList;
 
+QString escapeSpaces(const QString& mountPoint);
+QString unescapeSpaces(const QString& mountPoint);
+
 LIBKPMCORE_EXPORT FstabEntryList readFstabEntries(const QString& fstabPath = QStringLiteral("/etc/fstab"));
 LIBKPMCORE_EXPORT QStringList possibleMountPoints(const QString& deviceNode, const QString& fstabPath = QStringLiteral("/etc/fstab"));
 LIBKPMCORE_EXPORT bool writeMountpoints(const FstabEntryList& fstabEntries, const QString& filename = QStringLiteral("/etc/fstab"));