From: Richard W.M. Jones <rjones@redhat.com>
Date: Fri, 19 Nov 2010 13:05:49 +0000 (+0000)
Subject: cat: Give a better error if the user specified no drives on command line.
X-Git-Tag: 1.7.11~6
X-Git-Url: http://git.annexia.org/?a=commitdiff_plain;h=3bd883f344a5d6f155f7252e8a478d5b7935d7c6;p=libguestfs.git

cat: Give a better error if the user specified no drives on command line.
---

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.
    */