Enable/disable Next button based on whether we have a root mount point

src/modules/partition/PartitionCoreModule.cpp

@@ -88,13 +88,28 @@ PartitionCoreModule::createPartition( Device* device, PartitionInfo* partitionIn
     partitionModel->reload();
     m_jobs << Calamares::job_ptr( job );
 
+    if ( partitionInfo->mountPoint == "/" && !m_hasRootMountPoint )
+    {
+        m_hasRootMountPoint = true;
+        hasRootMountPointChanged( m_hasRootMountPoint );
+    }
+
     dumpQueue();
 }
 
 void
 PartitionCoreModule::deletePartition( Device* device, Partition* partition )
 {
-    m_infoForPartitionHash.remove( partition );
+    auto it = m_infoForPartitionHash.find( partition );
+    if ( it != m_infoForPartitionHash.end() )
+    {
+        if ( it.value()->mountPoint == "/" )
+        {
+            m_hasRootMountPoint = false;
+            hasRootMountPointChanged( m_hasRootMountPoint );
+        }
+        m_infoForPartitionHash.erase( it );
+    }
 
     if ( partition->state() == Partition::StateNew )
     {

src/modules/partition/PartitionCoreModule.h

@@ -41,6 +41,7 @@ class PartitionModel;
  */
 class PartitionCoreModule : public QObject
 {
+    Q_OBJECT
 public:
     PartitionCoreModule( QObject* parent = nullptr );
     ~PartitionCoreModule();
@@ -58,10 +59,19 @@ public:
         return m_jobs;
     }
 
+    bool hasRootMountPoint() const
+    {
+        return m_hasRootMountPoint;
+    }
+
+Q_SIGNALS:
+    void hasRootMountPointChanged( bool value );
+
 private:
     QList< Device* > m_devices;
     QHash< Device*, PartitionModel* > m_partitionModelForDeviceHash;
     DeviceModel* m_deviceModel;
+    bool m_hasRootMountPoint = false;
 
     InfoForPartitionHash m_infoForPartitionHash;
 

src/modules/partition/PartitionViewStep.cpp

@@ -27,6 +27,8 @@ PartitionViewStep::PartitionViewStep( QObject* parent )
     , m_core( new PartitionCoreModule( this ) )
     , m_widget( new PartitionPage( m_core ) )
 {
+    connect( m_core, SIGNAL( hasRootMountPointChanged( bool ) ),
+             SIGNAL( nextStatusChanged( bool ) ) );
 }
 
 
@@ -60,7 +62,7 @@ PartitionViewStep::back()
 bool
 PartitionViewStep::isNextEnabled() const
 {
-    return false;
+    return m_core->hasRootMountPoint();
 }