From 3a6c7c65cf4dc396e0e4c960f9c2c8568b7fb7ec Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Fri, 18 May 2018 10:46:10 +0200
Subject: update-kernel-config: detect no-change

---
 update-kernel-config | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/update-kernel-config b/update-kernel-config
index 7541058..3962426 100755
--- a/update-kernel-config
+++ b/update-kernel-config
@@ -21,10 +21,15 @@ fi
 
 diff=$(
   git -C "/usr/src/archlinux/packages/$2/repos/$1-x86_64" diff "${old_revision}" HEAD -- config | \
-    grep '^[+-]' | \
+    grep '^[+-].' | \
     grep -v '^+++\|^---'
 )
 
+if [ -z "${diff}" ]; then
+  >&2 echo 'nothing changed.'
+  exit 1
+fi
+
 {
   grep -vxF "$(
     printf '%s\n' "${diff}" | \
-- 
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