From 5368f0a59549b7b26154b2326abfd1f260f1750d Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Tue, 26 Aug 2014 11:57:53 +0200
Subject: [PATCH] lbu: use --no-dereference with diff when possible

---
 lbu.in | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lbu.in b/lbu.in
index 52172c7..67ec631 100644
--- a/lbu.in
+++ b/lbu.in
@@ -672,6 +672,7 @@ usage: $PROGRAM diff [<media>]
 }
 
 cmd_diff() {
+	local diff_opts=
 	LBU_MEDIA=${1:-"$LBU_MEDIA"}
 	[ -z "$LBU_MEDIA" ] && [ -z "$LBU_BACKUPDIR" ] && usage_diff
 	local tmp
@@ -680,7 +681,10 @@ cmd_diff() {
 	unpack_apkovl "$tmp/a"
 	ENCRYPTION=
 	cmd_package - | tar -C "$tmp/b" -zx
-	cd "$tmp" && diff -ruN a b
+	if diff --help 2>&1 | grep -q -- --no-dereference; then
+		diff_opts="--no-dereference"
+	fi
+	cd "$tmp" && diff -ruN $diff_opts a b
 }
 
 # migrate
-- 
2.1.0