[gnome-initial-setup/wip/pwithnall/misc-fixes: 44/70] language: check {unattended, install}.ini on eosinstaller images

[Philip Withnall <pwithnall src gnome org>]

commit 580bfbe405e18d9abc555ea9a92eae213220f48b
Author: Will Thompson <will willthompson co uk>
Date:   Thu Feb 22 19:15:06 2018 +0000

    language: check {unattended,install}.ini on eosinstaller images
    
    If install.ini exists, we pre-set the locale from it. If unattended.ini
    exists, we pre-set the locale from it, and immediately skip ahead to the
    live-chooser page, which will launch the reformatter.
    
    In the second case, we want to avoid gnome-initial-setup ever being
    shown to the user. So, we explicitly hide it, and teach GisDriver to not
    present() the window if it has been hidden. (When the reformatter exists
    or fails to launch, the live-chooser page tells the driver to show the
    window again.)
    
    (Rebase 3.38: Fix minor rebase conflicts.)
    
    https://phabricator.endlessm.com/T17082

 gnome-initial-setup/gis-driver.c                   |   6 +-
 .../pages/language/gis-language-page.c             | 108 +++++++++++++++++++++
 2 files changed, 113 insertions(+), 1 deletion(-)
---
diff --git a/gnome-initial-setup/gis-driver.c b/gnome-initial-setup/gis-driver.c
index b74cf6c3..6a57b26b 100644
--- a/gnome-initial-setup/gis-driver.c
+++ b/gnome-initial-setup/gis-driver.c
@@ -103,6 +103,7 @@ struct _GisDriverPrivate {
   GisDriverMode mode;
   UmAccountMode account_mode;
   gboolean small_screen;
+  gboolean hidden;
 
   locale_t locale;
 
@@ -641,6 +642,7 @@ gis_driver_show_window (GisDriver *driver)
 {
   GisDriverPrivate *priv = gis_driver_get_instance_private (driver);
 
+  priv->hidden = FALSE;
   gtk_window_present (priv->main_window);
 }
 
@@ -649,6 +651,7 @@ gis_driver_hide_window (GisDriver *driver)
 {
   GisDriverPrivate *priv = gis_driver_get_instance_private (driver);
 
+  priv->hidden = TRUE;
   gtk_widget_hide (GTK_WIDGET (priv->main_window));
 }
 
@@ -894,7 +897,8 @@ gis_driver_activate (GApplication *app)
 
   G_APPLICATION_CLASS (gis_driver_parent_class)->activate (app);
 
-  gtk_window_present (GTK_WINDOW (priv->main_window));
+  if (!priv->hidden)
+    gtk_window_present (GTK_WINDOW (priv->main_window));
 }
 
 static gboolean
diff --git a/gnome-initial-setup/pages/language/gis-language-page.c 
b/gnome-initial-setup/pages/language/gis-language-page.c
index f21bbe1d..676572b7 100644
--- a/gnome-initial-setup/pages/language/gis-language-page.c
+++ b/gnome-initial-setup/pages/language/gis-language-page.c
@@ -62,6 +62,8 @@ struct _GisLanguagePagePrivate
   GCancellable *cancellable;
 
   GtkAccelGroup *accel_group;
+
+  gboolean checked_unattended_config;
 };
 typedef struct _GisLanguagePagePrivate GisLanguagePagePrivate;
 
@@ -363,6 +365,111 @@ gis_language_page_locale_changed (GisPage *page)
   gis_page_set_title (GIS_PAGE (page), _("Welcome"));
 }
 
+/* See https://github.com/endlessm/eos-installer/blob/master/UNATTENDED.md for
+ * full documentation on the reformatter's unattended mode.
+ */
+
+/* On eosinstaller images, a run-mount-eosimages.mount unit is shipped which
+ * arranges for this path to be mounted.
+ */
+#define EOSIMAGES_MOUNT_POINT "/run/mount/eosimages/"
+/* Created by hand, or by hitting Ctrl+U on the last page of the reformatter.
+ * Its mere presence triggers an unattended installation; it may also specify a
+ * locale.
+ */
+#define UNATTENDED_INI_PATH EOSIMAGES_MOUNT_POINT "unattended.ini"
+/* Created by the installer for Windows when it creates a reformatter USB.
+ * Doesn't trigger unattended mode, just pre-selects a UI language.
+ */
+#define INSTALL_INI_PATH EOSIMAGES_MOUNT_POINT "install.ini"
+
+#define LOCALE_GROUP "EndlessOS"
+#define LOCALE_KEY "locale"
+
+/*
+ * check_reformatter_key_file:
+ * @locale: (out): locale specified within @path, or %NULL if none was
+ *  specified.
+ *
+ * Checks whether @path is a valid keyfile, and whether it specifies a locale.
+ *
+ * Returns: %TRUE if @path could be read.
+ */
+static gboolean
+check_reformatter_key_file (const gchar *path,
+                            gchar      **locale)
+{
+  g_autoptr(GKeyFile) key_file = g_key_file_new ();
+  g_autoptr(GError) error = NULL;
+
+  g_return_val_if_fail (locale != NULL, FALSE);
+  g_return_val_if_fail (*locale == NULL, FALSE);
+
+  if (!g_key_file_load_from_file (key_file, path, G_KEY_FILE_NONE, &error))
+    {
+      if (!g_error_matches (error, G_FILE_ERROR, G_FILE_ERROR_NOENT))
+        g_warning ("Failed to read %s: %s", path, error->message);
+
+      return FALSE;
+    }
+
+  *locale = g_key_file_get_string (key_file, LOCALE_GROUP, LOCALE_KEY, &error);
+  if (error != NULL &&
+      !g_error_matches (error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_GROUP_NOT_FOUND) &&
+      !g_error_matches (error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND))
+    {
+      g_warning ("Failed to read locale from %s: %s", path, error->message);
+    }
+
+  return TRUE;
+}
+
+static gboolean
+assistant_next_idle_cb (gpointer user_data)
+{
+  gis_assistant_next_page (GIS_ASSISTANT (user_data));
+  return G_SOURCE_REMOVE;
+}
+
+static void
+gis_language_page_shown (GisPage *page)
+{
+  GisLanguagePage *self = GIS_LANGUAGE_PAGE (page);
+  GisLanguagePagePrivate *priv = gis_language_page_get_instance_private (self);
+  gboolean skip_ahead = FALSE;
+  g_autofree gchar *locale = NULL;
+
+  /* For now, only support unattended mode on eosinstaller images. */
+  if (!gis_driver_is_reformatter (page->driver))
+    return;
+
+  /* Only take action once. This prevents an infinite loop if eos-installer
+   * crashes on launch.
+   */
+  if (priv->checked_unattended_config)
+    return;
+
+  priv->checked_unattended_config = TRUE;
+
+  if (check_reformatter_key_file (UNATTENDED_INI_PATH, &locale))
+    skip_ahead = TRUE;
+  else
+    check_reformatter_key_file (INSTALL_INI_PATH, &locale);
+
+  if (locale != NULL)
+    cc_language_chooser_set_language (CC_LANGUAGE_CHOOSER (priv->language_chooser),
+                                      locale);
+
+  if (skip_ahead)
+    {
+      gis_driver_hide_window (page->driver);
+      g_idle_add_full (G_PRIORITY_DEFAULT_IDLE,
+                       assistant_next_idle_cb,
+                       g_object_ref (gis_driver_get_assistant (page->driver)),
+                       g_object_unref);
+    }
+}
+
 static void
 gis_language_page_dispose (GObject *object)
 {
@@ -392,6 +499,7 @@ gis_language_page_class_init (GisLanguagePageClass *klass)
   page_class->page_id = PAGE_ID;
   page_class->locale_changed = gis_language_page_locale_changed;
   page_class->get_accel_group = gis_language_page_get_accel_group;
+  page_class->shown = gis_language_page_shown;
   object_class->constructed = gis_language_page_constructed;
   object_class->dispose = gis_language_page_dispose;
 }