From 03d32ae9516c435d92578ffe1496e7dd5dca9738 Mon Sep 17 00:00:00 2001
From: Dmitry Guryanov <dguryanov@mirantis.com>
Date: Thu, 11 Aug 2016 17:27:41 +0300
Subject: [PATCH] Add error message, when run not on a tty

The library, which displays user interface, urwid,
executes ioctl on stdin file descriptor, which
works only on ttys. Let's report error, when we run
not on a tty to make error investigation easier.

Change-Id: I15e80f14f65f6467eca153dc2cd73c64751c9154
Partial-Bug: #1607402
---
 fuelmenu/fuelmenu.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fuelmenu/fuelmenu.py b/fuelmenu/fuelmenu.py
index 3067480..dcc605b 100755
--- a/fuelmenu/fuelmenu.py
+++ b/fuelmenu/fuelmenu.py
@@ -384,6 +384,10 @@ def main(*args, **kwargs):
         setup(save_only=True,
               managed_iface=options.iface)
     else:
+        if not os.isatty(sys.stdin.fileno()):
+            print("Stdin is not a tty, can't run fuelmenu "
+                  "in interactive mode.")
+            sys.exit(1)
         setup()
 
 if '__main__' == __name__ or urwid.web_display.is_web_request():