[libcalamares] When enqueueing jobs, pass a weight

- The weight is the module (instance) weight, which can be
  - the default weight of 1
  - the weight specified for the module (in module.desc / the module
    descriptor; this defaults to 1, above)
  - the weight specified for the instance (in settings.conf)
  The last of these "wins"; weights are constrained to 1..100

The weight isn't actually used in progress computation yet.

src/libcalamares/JobQueue.cpp

@@ -205,16 +205,7 @@ JobQueue::start()
 
 
 void
-JobQueue::enqueue( const job_ptr& job )
-{
-    Q_ASSERT( !m_thread->isRunning() );
-    m_jobs.append( job );
-    emit queueChanged( m_jobs );
-}
-
-
-void
-JobQueue::enqueue( const JobList& jobs )
+JobQueue::enqueue( int moduleWeight, const JobList& jobs )
 {
     Q_ASSERT( !m_thread->isRunning() );
     m_jobs.append( jobs );

src/libcalamares/JobQueue.h

@@ -30,7 +30,6 @@
 
 namespace Calamares
 {
-
 class GlobalStorage;
 class JobThread;
 
@@ -45,8 +44,12 @@ public:
 
     GlobalStorage* globalStorage() const;
 
-    void enqueue( const job_ptr& job );
-    void enqueue( const JobList& jobs );
+    /** @brief Queues up jobs from a single module source
+     *
+     * The total weight of the jobs is spread out to fill the weight
+     * of the module.
+     */
+    void enqueue( int moduleWeight, const JobList& jobs );
     void start();
 
     bool isRunning() const { return !m_finished; }

src/libcalamaresui/modulesystem/ModuleManager.h

@@ -71,6 +71,16 @@ public:
      */
     ModuleSystem::Descriptor moduleDescriptor( const QString& name );
 
+    /** @brief returns the module descriptor structure for the module @p instance
+     *
+     * Descriptors are for the module, which may have multiple instances;
+     * this is the same as moduleDescriptor( instance.module() ).
+     */
+    ModuleSystem::Descriptor moduleDescriptor( const ModuleSystem::InstanceKey& instanceKey )
+    {
+        return moduleDescriptor( instanceKey.module() );
+    }
+
     /**
      * @brief moduleInstance returns a Module object for a given instance key.
      * @param instanceKey the instance key for a module instance.

src/libcalamaresui/viewpages/ExecutionViewStep.cpp

@@ -146,10 +146,24 @@ ExecutionViewStep::onActivate()
 {
     m_slideshow->changeSlideShowState( Slideshow::Start );
 
+    const auto instanceDescriptors = Calamares::Settings::instance()->moduleInstances();
+
     JobQueue* queue = JobQueue::instance();
     for ( const auto& instanceKey : m_jobInstanceKeys )
     {
+        const auto& moduleDescriptor = Calamares::ModuleManager::instance()->moduleDescriptor( instanceKey );
         Calamares::Module* module = Calamares::ModuleManager::instance()->moduleInstance( instanceKey );
+
+        const auto instanceDescriptor
+            = std::find_if( instanceDescriptors.constBegin(),
+                            instanceDescriptors.constEnd(),
+                            [=]( const Calamares::InstanceDescription& d ) { return d.key() == instanceKey; } );
+        int weight = moduleDescriptor.weight();
+        if ( instanceDescriptor != instanceDescriptors.constEnd() && instanceDescriptor->explicitWeight() )
+        {
+            weight = instanceDescriptor->weight();
+        }
+        weight = qBound( 1, weight, 100 );
         if ( module )
         {
             auto jl = module->jobs();
@@ -160,7 +174,7 @@ ExecutionViewStep::onActivate()
                     j->setEmergency( true );
                 }
             }
-            queue->enqueue( jl );
+            queue->enqueue( weight, jl );
         }
     }