From a07edaa4a0e84573107ce11674d03dd7d1232c28 Mon Sep 17 00:00:00 2001
From: "Roger A. Light" <roger@atchoo.org>
Date: Fri, 10 Jul 2020 21:46:44 +0100
Subject: [PATCH] db_dump: Print error when file not accessible.

---
 src/db_dump/db_dump.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/db_dump/db_dump.c b/src/db_dump/db_dump.c
index 45eb80a6..2f228353 100644
--- a/src/db_dump/db_dump.c
+++ b/src/db_dump/db_dump.c
@@ -402,7 +402,10 @@ int main(int argc, char *argv[])
 	}
 	memset(&db, 0, sizeof(struct mosquitto_db));
 	fd = fopen(filename, "rb");
-	if(!fd) return 0;
+	if(!fd){
+		fprintf(stderr, "Error: Unable to open %s\n", filename);
+		return 0;
+	}
 	read_e(fd, &header, 15);
 	if(!memcmp(header, magic, 15)){
 		if(do_print) printf("Mosquitto DB dump\n");