From 44d5561daff4ffa94e394e18c41001244bc170dc Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 12 Dec 2022 22:03:52 +0900
Subject: [PATCH] sd-id128: make sd_id128_get_boot() and friend return -ENOSYS
 when /proc/ is not mounted

(cherry picked from commit e2720340e9fdf3aee2e8998dc72798de50be3630)

Related: RHEL-27512
---
 src/libsystemd/sd-id128/sd-id128.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libsystemd/sd-id128/sd-id128.c b/src/libsystemd/sd-id128/sd-id128.c
index bff8074f19..b3f4728988 100644
--- a/src/libsystemd/sd-id128/sd-id128.c
+++ b/src/libsystemd/sd-id128/sd-id128.c
@@ -15,6 +15,7 @@
 #include "macro.h"
 #include "missing_syscall.h"
 #include "random-util.h"
+#include "stat-util.h"
 #include "user-util.h"
 #include "util.h"
 
@@ -147,6 +148,8 @@ _public_ int sd_id128_get_boot(sd_id128_t *ret) {
 
         if (sd_id128_is_null(saved_boot_id)) {
                 r = id128_read("/proc/sys/kernel/random/boot_id", ID128_FORMAT_UUID, &saved_boot_id);
+                if (r == -ENOENT && proc_mounted() == 0)
+                        return -ENOSYS;
                 if (r < 0)
                         return r;