[processing][gdal] Correctly handle geopackage paths with layername argument

Fixes #19938

Author: nyalldawson

python/plugins/processing/algs/gdal/GdalAlgorithm.py

@@ -35,7 +35,8 @@
                        QgsProcessingFeatureSourceDefinition,
                        QgsProcessingAlgorithm,
                        QgsProcessingContext,
-                       QgsProcessingFeedback)
+                       QgsProcessingFeedback,
+                       QgsProviderRegistry)
 
 from processing.algs.gdal.GdalAlgorithmDialog import GdalAlgorithmDialog
 from processing.algs.gdal.GdalUtils import GdalUtils
@@ -106,7 +107,12 @@ def getOgrCompatibleSource(self, parameter_name, parameters, context, feedback,
                 ogr_data_path = self.parameterAsCompatibleSourceLayerPath(parameters, parameter_name, context,
                                                                           QgsVectorFileWriter.supportedFormatExtensions(),
                                                                           feedback=feedback)
-                ogr_layer_name = GdalUtils.ogrLayerName(input_layer.dataProvider().dataSourceUri())
+                parts = QgsProviderRegistry.instance().decodeUri('ogr', ogr_data_path)
+                ogr_data_path = parts['path']
+                if 'layerName' in parts and parts['layerName']:
+                    ogr_layer_name = parts['layerName']
+                else:
+                    ogr_layer_name = GdalUtils.ogrLayerName(ogr_data_path)
             else:
                 #not executing - don't worry about 'selected features only' handling. It has no meaning
                 #for the command line preview since it has no meaning outside of a QGIS session!

python/plugins/processing/tests/testdata/custom/circular_strings.gpkg

@@ -29,6 +29,7 @@
 #include "qgsexpressioncontextscopegenerator.h"
 #include "qgsfileutils.h"
 #include "qgsvectorlayer.h"
+#include "qgsproviderregistry.h"
 
 QList<QgsRasterLayer *> QgsProcessingUtils::compatibleRasterLayers( QgsProject *project, bool sort )
 {
@@ -631,8 +632,16 @@ QString QgsProcessingUtils::convertToCompatibleFormat( const QgsVectorLayer *vl,
   bool requiresTranslation = selectedFeaturesOnly;
   if ( !selectedFeaturesOnly )
   {
-    QFileInfo fi( vl->source() );
-    requiresTranslation = !compatibleFormats.contains( fi.suffix(), Qt::CaseInsensitive );
+    const QVariantMap parts = QgsProviderRegistry::instance()->decodeUri( vl->dataProvider()->name(), vl->source() );
+    if ( parts.contains( QLatin1String( "path" ) ) )
+    {
+      QFileInfo fi( parts.value( QLatin1String( "path" ) ).toString() );
+      requiresTranslation = !compatibleFormats.contains( fi.suffix(), Qt::CaseInsensitive );
+    }
+    else
+    {
+      requiresTranslation = true; // not a disk-based format
+    }
   }
 
   if ( requiresTranslation )