From 039b88f75367203e540009cc97603b1bce3fafa6 Mon Sep 17 00:00:00 2001
From: Stijn Tintel <stijn@linux-ipv6.be>
Date: Tue, 8 Nov 2022 14:43:25 +0200
Subject: [PATCH] sysupgrade: print errno on failure

The error message "Failed to exec upgraded." is not very informative.
Add errno to the message to make it more useful.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
---
 sysupgrade.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sysupgrade.c b/sysupgrade.c
index fc588b0..96a29e9 100644
--- a/sysupgrade.c
+++ b/sysupgrade.c
@@ -19,8 +19,10 @@
 #include "sysupgrade.h"
 
 #include <ctype.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include <libubox/blobmsg.h>
@@ -103,7 +105,7 @@ void sysupgrade_exec_upgraded(const char *prefix, char *path,
 	execvp(argv[0], argv);
 
 	/* Cleanup on failure */
-	fprintf(stderr, "Failed to exec upgraded.\n");
+	fprintf(stderr, "Failed to exec upgraded: %s\n", strerror(-errno));
 	unsetenv("WDTFD");
 	watchdog_set_cloexec(true);
 	ret = chroot(".");
-- 
2.30.2