[partition] Introduce a check if the GPT-on-BIOS popup should be shown

The check is bogus right now, and it still always warns; but if
the `shouldWarnForGPTOnBIOS()` function is implemented, this will
fix issue 1701.

src/modules/partition/gui/PartitionViewStep.cpp

@@ -395,6 +395,18 @@ PartitionViewStep::onActivate()
     }
 }
 
+static bool
+shouldWarnForGPTOnBIOS( const PartitionCoreModule* core )
+{
+    if ( PartUtils::isEfiSystem() )
+    {
+        return false;
+    }
+
+    cDebug() << core->bootLoaderInstallPath();
+
+    return true;
+}
 
 void
 PartitionViewStep::onLeave()
@@ -462,24 +474,25 @@ PartitionViewStep::onLeave()
         {
 
             cDebug() << "device: BIOS";
-            // TODO: this *always* warns, which might be annoying, so it'd be
-            //       best to find a way to detect that bios_grub partition.
-
-            QString message = tr( "Option to use GPT on BIOS" );
-            QString description = tr( "A GPT partition table is the best option for all "
-                                      "systems. This installer supports such a setup for "
-                                      "BIOS systems too."
-                                      "<br/><br/>"
-                                      "To configure a GPT partition table on BIOS, "
-                                      "(if not done so already) go back "
-                                      "and set the partition table to GPT, next create a 8 MB "
-                                      "unformatted partition with the "
-                                      "<strong>bios_grub</strong> flag enabled.<br/><br/>"
-                                      "An unformatted 8 MB partition is necessary "
-                                      "to start %1 on a BIOS system with GPT." )
-                                      .arg( branding->shortProductName() );
-
-            QMessageBox::information( m_manualPartitionPage, message, description );
+
+            if ( shouldWarnForGPTOnBIOS( m_core ) )
+            {
+                QString message = tr( "Option to use GPT on BIOS" );
+                QString description = tr( "A GPT partition table is the best option for all "
+                                          "systems. This installer supports such a setup for "
+                                          "BIOS systems too."
+                                          "<br/><br/>"
+                                          "To configure a GPT partition table on BIOS, "
+                                          "(if not done so already) go back "
+                                          "and set the partition table to GPT, next create a 8 MB "
+                                          "unformatted partition with the "
+                                          "<strong>bios_grub</strong> flag enabled.<br/><br/>"
+                                          "An unformatted 8 MB partition is necessary "
+                                          "to start %1 on a BIOS system with GPT." )
+                                          .arg( branding->shortProductName() );
+
+                QMessageBox::information( m_manualPartitionPage, message, description );
+            }
         }
 
         Partition* root_p = m_core->findPartitionByMountPoint( "/" );
@@ -593,7 +606,7 @@ PartitionViewStep::setConfigurationMap( const QVariantMap& configurationMap )
     // because it could take a while. Then when it's done, we can set up the widgets
     // and remove the spinner.
     m_future = new QFutureWatcher< void >();
-    connect( m_future, &QFutureWatcher< void >::finished, this, [this] {
+    connect( m_future, &QFutureWatcher< void >::finished, this, [ this ] {
         continueLoading();
         this->m_future->deleteLater();
         this->m_future = nullptr;