virt-install: If in --prompt mode, ask about overwriting existing disk

Author: crobinso

virtinst/cli.py

@@ -494,7 +494,8 @@ def disk_prompt(prompt_txt, arg_dict, warn_overwrite=False, prompt_size=True,
         askmsg = _("Do you really want to use this disk (yes or no)")
 
         # Prompt if disk file already exists and preserve mode is not used
-        if (path_exists and dev.type == dev.TYPE_FILE and warn_overwrite):
+        if ((path_exists and dev.type == dev.TYPE_FILE and warn_overwrite) or
+            is_prompt()):
             msg = (_("This will overwrite the existing path '%s'" %
                    dev.path))
             if not prompt_for_yes_or_no(msg, askmsg):