From: Petr Štetiar <ynezz@true.cz>
Date: Tue, 26 Mar 2019 15:34:29 +0000 (+0100)
Subject: libfstools: Print error in case of loop blkdev failure
X-Git-Url: http://git.openwrt.org/?p=project%2Ffstools.git;a=commitdiff_plain;h=bc2c876104a6e2dcfc798c9dd09ac1f95784cdeb

libfstools: Print error in case of loop blkdev failure

It took me quite some time today(while fixing squashfs+overlay on
armvirt) to find out, that I was missing support for loop block device
in kernel, so I'm adding error message which might be helpful for
someone else in the future as well.

Acked-by: Jo-Philipp Wich <jo@mein.io>
Signed-off-by: Petr Štetiar <ynezz@true.cz>
---

diff --git a/libfstools/rootdisk.c b/libfstools/rootdisk.c
index dd00c1b..68a6296 100644
--- a/libfstools/rootdisk.c
+++ b/libfstools/rootdisk.c
@@ -258,8 +258,10 @@ static int rootdisk_volume_init(struct volume *v)
 	char str[128];
 	int ret = 0;
 
-	if (!p->loop_name[0] && rootdisk_create_loop(p) != 0)
+	if (!p->loop_name[0] && rootdisk_create_loop(p) != 0) {
+		ULOG_ERR("unable to create loop device\n");
 		return -1;
+	}
 
 	v->type = BLOCKDEV;
 	v->blk = p->loop_name;