test: add tests for JoinsNamespaceOf=

To illustrate the current behavior of the dependency.

test/testsuite-23.units/testsuite-23-joins-namespace-of-1.service

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Service]
+Type=notify
+NotifyAccess=all
+MountAPIVFS=yes
+PrivateTmp=yes
+ExecStart=/bin/bash -c 'touch /tmp/shared-private-file && systemd-notify --ready && sleep infinity'

test/testsuite-23.units/testsuite-23-joins-namespace-of-2.service

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Unit]
+JoinsNamespaceOf=testsuite-23-joins-namespace-of-1.service
+
+[Service]
+Type=oneshot
+MountAPIVFS=yes
+PrivateTmp=yes
+ExecStart=test -e /tmp/shared-private-file
+ExecStart=touch /tmp/hoge

test/testsuite-23.units/testsuite-23-joins-namespace-of-3.service

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Unit]
+JoinsNamespaceOf=testsuite-23-joins-namespace-of-1.service
+
+[Service]
+Type=oneshot
+MountAPIVFS=yes
+PrivateTmp=yes
+ExecStart=test -e /tmp/shared-private-file
+ExecStart=test -e /tmp/hoge

test/testsuite-23.units/testsuite-23-joins-namespace-of-4.service

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Unit]
+JoinsNamespaceOf=testsuite-23-joins-namespace-of-5.service
+
+[Service]
+Type=notify
+NotifyAccess=all
+MountAPIVFS=yes
+PrivateTmp=yes
+ExecStart=/bin/bash -c 'touch /tmp/shared-private-file && systemd-notify --ready && sleep infinity'

test/testsuite-23.units/testsuite-23-joins-namespace-of-5.service

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Service]
+Type=oneshot
+MountAPIVFS=yes
+PrivateTmp=yes
+ExecStart=test ! -e /tmp/shared-private-file

test/testsuite-23.units/testsuite-23-joins-namespace-of-6.service

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Unit]
+JoinsNamespaceOf=testsuite-23-joins-namespace-of-8.service
+
+[Service]
+Type=notify
+NotifyAccess=all
+MountAPIVFS=yes
+PrivateTmp=yes
+ExecStart=/bin/bash -c 'touch /tmp/shared-private-file-x && systemd-notify --ready && sleep infinity'

test/testsuite-23.units/testsuite-23-joins-namespace-of-7.service

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Unit]
+JoinsNamespaceOf=testsuite-23-joins-namespace-of-8.service
+
+[Service]
+Type=oneshot
+MountAPIVFS=yes
+PrivateTmp=yes
+ExecStart=test ! -e /tmp/shared-private-file-x
+ExecStart=test ! -e /tmp/shared-private-file-y
+ExecStart=touch /tmp/hoge

test/testsuite-23.units/testsuite-23-joins-namespace-of-8.service

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Service]
+Type=notify
+NotifyAccess=all
+MountAPIVFS=yes
+PrivateTmp=yes
+ExecStartPre=test ! -e /tmp/shared-private-file-x
+ExecStartPre=test ! -e /tmp/hoge
+ExecStart=/bin/bash -c 'touch /tmp/shared-private-file-y && systemd-notify --ready && sleep infinity'

test/testsuite-23.units/testsuite-23-joins-namespace-of-9.service

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Unit]
+JoinsNamespaceOf=testsuite-23-joins-namespace-of-8.service
+
+[Service]
+Type=oneshot
+MountAPIVFS=yes
+PrivateTmp=yes
+ExecStart=test ! -e /tmp/shared-private-file-x
+ExecStart=test -e /tmp/shared-private-file-y
+ExecStart=test ! -e /tmp/hoge

test/units/testsuite-23.JoinsNamespaceOf.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+set -eux
+set -o pipefail
+
+# Test JoinsNamespaceOf= with PrivateTmp=yes
+
+systemd-analyze log-level debug
+systemd-analyze log-target journal
+
+# simple case
+systemctl start testsuite-23-joins-namespace-of-1.service
+systemctl start testsuite-23-joins-namespace-of-2.service
+systemctl start testsuite-23-joins-namespace-of-3.service
+systemctl stop testsuite-23-joins-namespace-of-1.service
+
+# inverse dependency
+systemctl start testsuite-23-joins-namespace-of-4.service
+systemctl start testsuite-23-joins-namespace-of-5.service
+systemctl stop testsuite-23-joins-namespace-of-4.service
+
+# transitive dependency
+systemctl start testsuite-23-joins-namespace-of-6.service
+systemctl start testsuite-23-joins-namespace-of-7.service
+systemctl start testsuite-23-joins-namespace-of-8.service
+systemctl start testsuite-23-joins-namespace-of-9.service
+systemctl stop testsuite-23-joins-namespace-of-6.service
+systemctl stop testsuite-23-joins-namespace-of-8.service
+
+systemd-analyze log-level info