[partition] Fix parsing of partition size in partition layout

When setting the size of a partition without indicating the unit, two
problems occur:

- the size is parsed as an integer, not as a string, hence the
configuration parsing fails
- the size parser doesn't recognize the fact that the size has no units
and defaults to 100%

This patch fixes the configuration parsing as well as the size string
parsing.

Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>

src/modules/partition/core/PartitionCoreModule.cpp

@@ -772,17 +772,30 @@ PartitionCoreModule::initLayout()
 void
 PartitionCoreModule::initLayout( const QVariantList& config )
 {
+    QString sizeString;
+    QString minSizeString;
+
     m_partLayout = new PartitionLayout();
 
     for ( const auto& r : config )
     {
         QVariantMap pentry = r.toMap();
 
+        if ( pentry.contains("size") && CalamaresUtils::getString( pentry, "size" ).isEmpty() )
+            sizeString.setNum( CalamaresUtils::getInteger( pentry, "size", 0 ) );
+        else
+            sizeString = CalamaresUtils::getString( pentry, "size" );
+
+        if ( pentry.contains("minSize") && CalamaresUtils::getString( pentry, "minSize" ).isEmpty() )
+            minSizeString.setNum( CalamaresUtils::getInteger( pentry, "minSize", 0 ) );
+        else
+            minSizeString = CalamaresUtils::getString( pentry, "minSize" );
+
         m_partLayout->addEntry( CalamaresUtils::getString( pentry, "name" ),
                                 CalamaresUtils::getString( pentry, "mountPoint" ),
                                 CalamaresUtils::getString( pentry, "filesystem" ),
-                                CalamaresUtils::getString( pentry, "size" ),
-                                CalamaresUtils::getString( pentry, "minSize" )
+                                sizeString,
+                                minSizeString
                               );
     }
 }

src/modules/partition/core/PartitionLayout.cpp

@@ -57,11 +57,18 @@ parseSizeString( QString sizeString, PartitionLayout::SizeUnit *unit )
 {
     double value;
     bool ok;
+    QString valueString;
+    QString unitString;
 
     QRegExp rx( "[KkMmGg%]" );
     int pos = rx.indexIn( sizeString );
-    QString valueString = sizeString.mid( 0, pos );
-    QString unitString = sizeString.mid( pos );
+    if (pos > 0)
+    {
+        valueString = sizeString.mid( 0, pos );
+        unitString = sizeString.mid( pos );
+    }
+    else
+        valueString = sizeString;
 
     value = valueString.toDouble( &ok );
     if ( !ok )