From 35ac2ad9cab9ad0b3a31876f5298e8924b9ce6d5 Mon Sep 17 00:00:00 2001
From: Evgeny Egorochkin <phreedom@yandex.ru>
Date: Tue, 6 Aug 2013 19:04:21 +0300
Subject: [PATCH] nixos-checkout: let it run without args again.

---
 modules/installer/tools/nixos-checkout.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/installer/tools/nixos-checkout.nix b/modules/installer/tools/nixos-checkout.nix
index 4859a454448..1a734ca5eeb 100644
--- a/modules/installer/tools/nixos-checkout.nix
+++ b/modules/installer/tools/nixos-checkout.nix
@@ -16,8 +16,8 @@ let
       ''
         #! ${pkgs.stdenv.shell} -e
 
-        if [ -z "$1" ] || [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
-          echo "Usage: `basename $0` PREFIX. See NixOS Manual for more info."
+        if [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
+          echo "Usage: `basename $0` [PREFIX]. See NixOS Manual for more info."
           exit 0
         fi