config: add preprocessing step

src/config.py

@@ -3,6 +3,7 @@
 import yaml
 
 DEFAULT_CONFIG_PATH = '/etc/os-installer/config.yaml'
+GIGABYTE_FACTOR = 1000 * 1000 * 1000
 
 
 def _bool_to_int(b: bool):
@@ -86,6 +87,10 @@ def _load_optional_defaults(config):
     config['chosen_features'] = []
 
 
+def _preprocess_values(config):
+    config['minimum_disk_size'] *= GIGABYTE_FACTOR
+
+
 def _set_testing_defaults(config):
     '''Default values used when skipping pages during testing.'''
     config['language'] = 'English for Dummies'
@@ -138,6 +143,7 @@ def init_config():
         config = _load_default_config()
     _load_optional_defaults(config)
     _set_testing_defaults(config)
+    _preprocess_values(config)
     return config
 
 

src/ui/pages/disk.py

@@ -11,8 +11,6 @@ from .page import Page
 from .system_calls import is_booted_with_uefi, open_disks
 from .widgets import reset_model, DeviceRow
 
-GIGABYTE_FACTOR = 1000 * 1000 * 1000
-
 
 @Gtk.Template(resource_path='/com/github/p3732/os-installer/ui/pages/disk.ui')
 class DiskPage(Gtk.Stack, Page):
@@ -39,7 +37,7 @@ class DiskPage(Gtk.Stack, Page):
     def __init__(self, **kwargs):
         Gtk.Stack.__init__(self, **kwargs)
 
-        self.minimum_disk_size = global_state.get_config('minimum_disk_size') * GIGABYTE_FACTOR
+        self.minimum_disk_size = global_state.get_config('minimum_disk_size')
 
         # models
         self.disk_list.bind_model(self.disk_list_model, self._create_device_row)