From a5167194cfa26070d6165b2e9569bf50a8d2676a Mon Sep 17 00:00:00 2001
From: cem <cem@FreeBSD.org>
Date: Wed, 22 Jul 2015 22:53:40 +0000
Subject: mount_nfs: Be more clear on nmount(2) error with errmsg unset

Differential Revision:	https://reviews.freebsd.org/D3147
Reviewed by:	rmacklem
Approved by:	markj (mentor)
MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division
---
 sbin/mount_nfs/mount_nfs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sbin/mount_nfs/mount_nfs.c b/sbin/mount_nfs/mount_nfs.c
index 836bc87..810cf59 100644
--- a/sbin/mount_nfs/mount_nfs.c
+++ b/sbin/mount_nfs/mount_nfs.c
@@ -476,7 +476,8 @@ main(int argc, char *argv[])
 	build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
 
 	if (nmount(iov, iovlen, 0))
-		err(1, "%s, %s", mntpath, errmsg);
+		err(1, "nmount: %s%s%s", mntpath, errmsg[0] ? ", " : "",
+		    errmsg);
 
 	exit(0);
 }
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