[partition] Add convenience methods to FstabEntry

- Add something like a constructor
 - Add validity checking

src/modules/partition/core/PartUtils.cpp

@@ -372,3 +372,31 @@ isEfiBootable( const Partition* candidate )
 }
 
 }  // nmamespace PartUtils
+
+/* Implementation of methods for FstabEntry, from OsproberEntry.h */
+
+bool
+FstabEntry::isValid() const
+{
+    return !partitionNode.isEmpty() && !mountPoint.isEmpty() && !fsType.isEmpty();
+}
+
+FstabEntry
+FstabEntry::fromEtcFstab( const QString& rawLine )
+{
+    QString line = rawLine.simplified();
+    if ( line.startsWith( '#' ) )
+        return FstabEntry{ QString(), QString(), QString(), QString(), 0, 0 };
+
+    QStringList splitLine = line.split( ' ' );
+    if ( splitLine.length() != 6 )
+        return FstabEntry{ QString(), QString(), QString(), QString(), 0, 0 };
+
+    return FstabEntry{ splitLine.at( 0 ), // path, or UUID, or LABEL, etc.
+                       splitLine.at( 1 ), // mount point
+                       splitLine.at( 2 ), // fs type
+                       splitLine.at( 3 ), // options
+                       splitLine.at( 4 ).toInt(), //dump
+                       splitLine.at( 5 ).toInt()  //pass
+                       };
+ }