From c47a7642fbbab2c00ee8ddbd48d59b7fa9eeee09 Mon Sep 17 00:00:00 2001
From: Michel Machado <michel@digirati.com.br>
Date: Fri, 9 Oct 2015 19:29:10 -0400
Subject: [PATCH] f3brew: handle lack of access right

When a non-root user called f3brew on a device,
f3brew would issue the following error message:

Your username doesn't have access to device `/dev/sdc'.
Try to run this program as root:
sudo f3probe /dev/sdc
In case you don't have access to root, use f3write/f3read.
f3brew: f3brew.c:484: main: Assertion `dev' failed.
Aborted (core dumped)

This patch avoids the assert().
---
 f3brew.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/f3brew.c b/f3brew.c
index dacd690..7f48b97 100644
--- a/f3brew.c
+++ b/f3brew.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <stdbool.h>
 #include <assert.h>
 #include <string.h>
@@ -481,7 +482,10 @@ int main(int argc, char **argv)
 			args.fake_size_byte, args.wrap, args.block_order,
 			args.keep_file)
 		: create_block_device(args.filename, args.reset_type);
-	assert(dev);
+	if (!dev) {
+		fprintf(stderr, "\nApplication cannot continue, finishing...\n");
+		exit(1);
+	}
 
 	printf("Physical block size: 2^%i Bytes\n\n", dev_get_block_order(dev));