From 4ecf5062e3b4f6b9604e83090d4e27306ee381fc Mon Sep 17 00:00:00 2001
From: Jozef Kralik <jojo.lwin@gmail.com>
Date: Fri, 1 Sep 2023 08:35:13 +0000
Subject: [PATCH] linux/storage: Add debug log for fopen failure on
 non-existent files

---
 port/linux/storage.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/port/linux/storage.c b/port/linux/storage.c
index bf8ca27cc7..6620120ad3 100644
--- a/port/linux/storage.c
+++ b/port/linux/storage.c
@@ -33,6 +33,8 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 
 static char g_store_path[OC_STORE_PATH_SIZE] = { 0 };
 static uint8_t g_store_path_len = 0;
@@ -123,8 +125,16 @@ oc_storage_read(const char *store, uint8_t *buf, size_t size)
 
   FILE *fp = fopen(g_store_path, "rb");
   if (fp == NULL) {
-    OC_ERR("failed to open %s for read: %d", g_store_path, errno);
-    return -EINVAL;
+#if OC_ERR_IS_ENABLED
+    struct stat st;
+    int fopen_errno = errno;
+    if (stat(g_store_path, &st) == 0) {
+      OC_ERR("failed to open %s for read: %d", g_store_path, fopen_errno);
+      return -errno;
+    }
+#endif /* OC_ERR_IS_ENABLED */
+    OC_DBG("failed to open %s for read: %d", g_store_path, fopen_errno);
+    return -errno;
   }
 
   if (fseek(fp, 0, SEEK_END) != 0) {