welcome: enable configuring of logo and text

example_config/config.yaml

@@ -35,9 +35,12 @@ suggested_languages:
     - 'zh'
 
 # Show a welcome page after language selection.
-# Default: usage: yes
+# A custom logo and text can be defined. Otherwise a default is used.
+# Default: logo: None, text: None, usage: yes
 welcome_page:
-    usage: yes
+    logo    : '/your/distribution/logo.png'
+    text    : 'A welcoming text to inform about the installation.'
+    usage   : yes
 
 # Minimum disk size needed for the installation (in Gigabyte)
 # Default: 5

src/config.py

@@ -42,7 +42,7 @@ def _configure_variables_set(config):
 
 def _load_default_config():
     return {
-        'welcome_page': {'usage': True},
+        'welcome_page': {'usage': True, 'logo': None, 'text': None},
         'internet_connection_required': True,
         'internet_checker_url': 'http://nmcheck.gnome.org/check_network_status.txt',
         'suggested_languages': ['en', 'ar', 'de', 'es', 'fr', 'ja', 'ru', 'zh'],
@@ -78,6 +78,8 @@ def _valid(config):
     return (
         _match(config, 'welcome_page', dict) and
         _match(config['welcome_page'], 'usage', bool) and
+        _match(config['welcome_page'], 'logo', str, type(None)) and
+        _match(config['welcome_page'], 'text', str, type(None)) and
         _match(config, 'internet_connection_required', bool) and
         _match(config, 'internet_checker_url', str) and
         _match(config, 'suggested_languages', list) and

src/ui/pages/welcome.py

@@ -17,8 +17,17 @@ class WelcomePage(Gtk.Box, Page):
 
     def __init__(self, **kwargs):
         Gtk.Box.__init__(self, **kwargs)
-        text = self.description.get_label()
-        text = text.format(global_state.get_config('distribution_name'))
+        config = global_state.get_config('welcome_page')
+
+        if config['logo']:
+            self.image_name = None
+            self.image_path = config['logo']
+
+        if config['text']:
+            text = config['text']
+        else:
+            text = self.description.get_label()
+            text = text.format(global_state.get_config('distribution_name'))
         self.description.set_label(text)
 
     ### callbacks ###