[partition] Allow a configurable EFI System Partition name

This commit adds the new configuration `efiSystemPartitionName` to the
file partition.conf.

This option sets the partition name to the EFI System Partition that is
created. If this option is unset, the partition is left unnamed.

src/modules/partition/core/PartitionActions.cpp

@@ -151,6 +151,10 @@ doAutopartition( PartitionCoreModule* core, Device* dev, Choices::AutoPartitionO
                                                                   KPM_PARTITION_FLAG( None ) );
         PartitionInfo::setFormat( efiPartition, true );
         PartitionInfo::setMountPoint( efiPartition, o.efiPartitionMountPoint );
+        if ( gs->contains( "efiSystemPartitionName" ) )
+        {
+            efiPartition->setLabel( gs->value( "efiSystemPartitionName" ).toString() );
+        }
         core->createPartition( dev, efiPartition, KPM_PARTITION_FLAG_ESP );
         firstFreeSector = lastSector + 1;
     }

src/modules/partition/gui/PartitionViewStep.cpp

@@ -538,6 +538,12 @@ PartitionViewStep::setConfigurationMap( const QVariantMap& configurationMap )
         gs->insert( "efiSystemPartitionSize", CalamaresUtils::getString( configurationMap, "efiSystemPartitionSize" ) );
     }
 
+    // Read and parse key efiSystemPartitionName
+    if ( configurationMap.contains( "efiSystemPartitionName" ) )
+    {
+        gs->insert( "efiSystemPartitionName", CalamaresUtils::getString( configurationMap, "efiSystemPartitionName" ) );
+    }
+
     // SWAP SETTINGS
     //
     // This is a bit convoluted because there's legacy settings to handle as well

src/modules/partition/partition.conf

@@ -7,6 +7,10 @@ efiSystemPartition:     "/boot/efi"
 # If nothing is specified, the default size of 300MiB will be used.
 # efiSystemPartitionSize:     300M
 
+# This optional setting specifies the name of the EFI system partition.
+# If nothing is specified, the partition name is left unset.
+# efiSystemPartitionName:     EFI
+
 # In autogenerated partitioning, allow the user to select a swap size?
 # If there is exactly one choice, no UI is presented, and the user
 # cannot make a choice -- this setting is used. If there is more than