From d89e0990f50a00cd4eddd781f31c7a801b0bc9c3 Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Tue, 15 Sep 2015 00:04:27 +0200
Subject: guix system: Gracefully handle incomplete commands.

Fixes <http://bugs.gnu.org/21451>.
Reported by Steve Sprang <steve.sprang@gmail.com>.

* guix/scripts/system.scm (guix-system)[option-arguments]: Error out
  when ACTION is #f.
---
 guix/scripts/system.scm | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'guix')

diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 45f598219d..56a9011e94 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -514,6 +514,13 @@ Build the operating system declared in FILE according to ACTION.\n"))
         (leave (_ "wrong number of arguments for action '~a'~%")
                action))
 
+      (unless action
+        (format (current-error-port)
+                (_ "guix system: missing command name~%"))
+        (format (current-error-port)
+                (_ "Try 'guix system --help' for more information.~%"))
+        (exit 1))
+
       (case action
         ((build vm vm-image disk-image reconfigure)
          (unless (= count 1)
-- 
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