File 5003-core-when-switching-root-remove-run-systemd-before-e.patch of Package systemd

From 437ea859ca6fa13e1b4b5075c85f6a5ebe93cd01 Mon Sep 17 00:00:00 2001
From: Franck Bui <fbui@suse.com>
Date: Wed, 17 Jul 2024 11:02:03 +0200
Subject: [PATCH 5003/5003] core: when switching root remove /run/systemd
 before executing the binary specified by init=

It's important if the binary specified by the init= boot option is not systemd
otherwise it confuses systemctl that incorrectly assumes that systemd is still
the init system due to the presence of /run/systemd/system.

Also some tools might also check the presence of /run/systemd/private to test
if systemd is running as pid1.

(cherry picked from commit 8c28dd24427598214d4464565192ec3f3b1a74a4)
---
 src/core/main.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/core/main.c b/src/core/main.c
index 4b8a315d86..ae8272d7e7 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -80,6 +80,7 @@
 #include "psi-util.h"
 #include "random-util.h"
 #include "rlimit-util.h"
+#include "rm-rf.h"
 #include "seccomp-util.h"
 #include "selinux-setup.h"
 #include "selinux-util.h"
@@ -2037,6 +2038,17 @@ static int do_reexecute(
         arg_serialization = safe_fclose(arg_serialization);
         fds = fdset_free(fds);
 
+        /* Drop /run/systemd directory. Some of its content can be used as a flag indicating that systemd is
+         * the init system but we might be replacing it with something different. If systemd is used again it
+         * will recreate the directory and its content anyway. */
+        r = rm_rf("/run/systemd.pre-switch-root", REMOVE_ROOT|REMOVE_MISSING_OK);
+        if (r < 0)
+                log_warning_errno(r, "Failed to prepare /run/systemd.pre-switch-root/, ignoring: %m");
+
+        r = RET_NERRNO(rename("/run/systemd", "/run/systemd.pre-switch-root"));
+        if (r < 0)
+                log_warning_errno(r, "Failed to move /run/systemd/ to /run/systemd.pre-switch-root/, ignoring: %m");
+
         /* Reopen the console */
         (void) make_console_stdio();
 
-- 
2.35.3