From 0ebc9f23faf5586f8a9250c3be08773eb3f8d2da Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 14 Dec 2020 12:37:23 +0900
Subject: [PATCH] core/namespace: ignore ENOENT for /proc/sys/kernel/domainname
 and hostname

If they do not exist, hostname or domainname cannot be modified. So, it is ok.

Fixes #17866, especially https://github.com/systemd/systemd/issues/17866#issuecomment-744118614.
---
 src/core/namespace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/core/namespace.c b/src/core/namespace.c
index cdf427a6ea..4d4cd4985c 100644
--- a/src/core/namespace.c
+++ b/src/core/namespace.c
@@ -1684,10 +1684,12 @@ int setup_namespace(
                         *(m++) = (MountEntry) {
                                 .path_const = "/proc/sys/kernel/hostname",
                                 .mode = READONLY,
+                                .ignore = true,
                         };
                         *(m++) = (MountEntry) {
                                 .path_const = "/proc/sys/kernel/domainname",
                                 .mode = READONLY,
+                                .ignore = true,
                         };
                 }