[LEDE-DEV] [PATCH] base-files: do not backup unchanged files

[luizluca at gmail.com]

From: Luiz Angelo Daros de Luca <luizluca at gmail.com>

Only backup /aaa/bbb/ccc if /rom/aaa/bbb/ccc does not exist
or /aaa/bbb/ccc is different from /rom/aaa/bbb/ccc.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca at gmail.com>
---
 package/base-files/files/sbin/sysupgrade | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/package/base-files/files/sbin/sysupgrade b/package/base-files/files/sbin/sysupgrade
index 359f21f51c..0085dbe07e 100755
--- a/package/base-files/files/sbin/sysupgrade
+++ b/package/base-files/files/sbin/sysupgrade
@@ -101,8 +101,10 @@ add_uci_conffiles() {
 	local file="$1"
 	( find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \
 		/etc/sysupgrade.conf /lib/upgrade/keep.d/* 2>/dev/null) \
-		-type f -o -type l 2>/dev/null;
-	  opkg list-changed-conffiles ) | sort -u > "$file"
+		$(opkg list-changed-conffiles) \
+		\( -type f -o -type l \) \
+		\( \( -exec test -e /rom{} \; -exec cmp -s {} /rom{} \; \) -o -print \) 2>/dev/null;
+	) | sort -u > "$file"
 	return 0
 }
 
-- 
2.14.1