grub2/grub2-btrfs-08-workaround-snapshot-menu-default-entry.patch

Index: grub-2.02~beta2/grub-core/normal/menu.c
===================================================================
--- grub-2.02~beta2.orig/grub-core/normal/menu.c
+++ grub-2.02~beta2/grub-core/normal/menu.c
@@ -575,6 +575,44 @@ print_countdown (struct grub_term_coordi
   grub_refresh ();
 }
 
+/* bsc#956046 - The first entry titled 'Bootable snapshot #$NUM' is inserted on
+   top at runtime to display current snapshot information. If default entry is
+   using number as key to index the entry, the result will be shifted so here we
+   add specical handling to shift it back. We apply this workaround until a better
+   solution can be found. */
+static void
+workaround_snapshot_menu_default_entry (grub_menu_t menu, const char *name, int *default_entry)
+{
+  grub_menu_entry_t entry;
+
+  if ((entry = grub_menu_get_entry (menu, 0))
+      && entry->submenu
+      && grub_strncmp (entry->title, "Bootable snapshot", sizeof("Bootable snapshot") - 1) == 0)
+    {
+      const char *val;
+
+      if (*default_entry == -1 && menu->size > 1)
+	{
+	  *default_entry = 1;
+	  return;
+	}
+
+      val = grub_env_get (name);
+
+      grub_error_push ();
+
+      if (val)
+	grub_strtoul (val, 0, 0);
+
+      if (*default_entry < (menu->size - 1) && grub_errno == GRUB_ERR_NONE)
+	++(*default_entry);
+
+      grub_error_pop ();
+    }
+
+  return;
+}
+
 #define GRUB_MENU_PAGE_SIZE 10
 
 /* Show the menu and handle menu entry selection.  Returns the menu entry
@@ -593,6 +631,8 @@ run_menu (grub_menu_t menu, int nested,
 
   default_entry = get_entry_number (menu, "default");
 
+  workaround_snapshot_menu_default_entry (menu, "default", &default_entry);
+
   /* If DEFAULT_ENTRY is not within the menu entries, fall back to
      the first entry.  */
   if (default_entry < 0 || default_entry >= menu->size)