From 3bd883f344a5d6f155f7252e8a478d5b7935d7c6 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Fri, 19 Nov 2010 13:05:49 +0000
Subject: [PATCH] cat: Give a better error if the user specified no drives on
 command line.

---
 cat/virt-cat.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cat/virt-cat.c b/cat/virt-cat.c
index 58ebd8e..3510a94 100644
--- a/cat/virt-cat.c
+++ b/cat/virt-cat.c
@@ -220,6 +220,10 @@ main (int argc, char *argv[])
   if (optind >= argc || argc - optind < 1)
     usage (EXIT_FAILURE);
 
+  /* User must have specified some drives. */
+  if (drvs == NULL)
+    usage (EXIT_FAILURE);
+
   /* Add drives, inspect and mount.  Note that inspector is always true,
    * and there is no -m option.
    */
-- 
1.8.3.1