[ostree] ostadmin: Print an error message if run as non-root

[Colin Walters <walters src gnome org>]

commit 5284d21f8dc981ce60cbe51db606198e3e97e026
Author: Colin Walters <walters verbum org>
Date:   Mon Jul 30 10:29:45 2012 -0400

    ostadmin: Print an error message if run as non-root
    
    See https://bugzilla.gnome.org/show_bug.cgi?id=680823

 src/ostadmin/ot-admin-main.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/ostadmin/ot-admin-main.c b/src/ostadmin/ot-admin-main.c
index d4d1d5b..52b26f6 100644
--- a/src/ostadmin/ot-admin-main.c
+++ b/src/ostadmin/ot-admin-main.c
@@ -100,6 +100,13 @@ ot_admin_main (int    argc,
   if (argc < 2)
     return usage (argv, builtins, 1);
 
+  if (geteuid () != 0)
+    {
+      g_set_error (&error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                   "ostadmin: Can only be run as root");
+      goto out;
+    }
+
   cmd = argv[1];
 
   builtin = builtins;