From 5b4c163002be61e240b1622a64917aee1793c00a Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 11 Feb 2021 23:09:54 +0100
Subject: [PATCH] efivars: debug log if we fail to detect whether
 /sys/firmware/efi/ exists

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

diff --git a/src/basic/efivars.c b/src/basic/efivars.c
index 5aeddef7e2..8e8d5f1d0b 100644
--- a/src/basic/efivars.c
+++ b/src/basic/efivars.c
@@ -290,8 +290,11 @@ bool is_efi_boot(void) {
         if (cache < 0) {
                 if (detect_container() > 0)
                         cache = false;
-                else
+                else {
                         cache = access("/sys/firmware/efi/", F_OK) >= 0;
+                        if (!cache && errno != ENOENT)
+                                log_debug_errno(errno, "Unable to test whether /sys/firmware/efi/ exists, assuming EFI not available: %m");
+                }
         }
 
         return cache;