From: Roman Yeryomin <roman@advem.lv>
Date: Sun, 7 Jan 2018 18:04:02 +0000 (+0200)
Subject: overlay: fix compilation with glibc
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Ffstools.git;a=commitdiff_plain;h=18090d97b61cc091ed3f49c3ec8ba42c761f1d15

overlay: fix compilation with glibc

glibc fails with:
warn_unused_result [-Wunused-result]
   system("cp -a /tmp/root/upper/* / 2>/dev/null");

Regression intoroduced with 11efbf3b90f031ce634fc38cad07a4aef2985777
Reported here:
https://www.mail-archive.com/lede-dev@lists.infradead.org/msg10502.html

Signed-off-by: Roman Yeryomin <roman@advem.lv>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
---

diff --git a/libfstools/overlay.c b/libfstools/overlay.c
index 0187a55..1d69f5a 100644
--- a/libfstools/overlay.c
+++ b/libfstools/overlay.c
@@ -257,7 +257,8 @@ jffs2_switch(struct volume *v)
 
 		/* try hard to be in sync */
 		ULOG_INFO("syncronizing overlay\n");
-		system("cp -a /tmp/root/upper/* / 2>/dev/null");
+		if (system("cp -a /tmp/root/upper/* / 2>/dev/null"))
+			ULOG_ERR("failed to sync jffs2 overlay\n");
 		break;
 
 	case FS_EXT4: