Hook up systemd-tmpfiles as user units

An explicit --user switch is necessary because for the user@0.service instance
systemd-tmpfiles is running as root, and we need to distinguish that from
systemd-tmpfiles running in systemd-tmpfiles*.service.

Fixes #2208.

v2:
- restore "systemd-" prefix
- add systemd-tmpfiles-clean.{service,timer}, systemd-setup.service to
  systemd-tmpfiles(8)

man/systemd-tmpfiles.xml

@@ -62,10 +62,16 @@
       <arg choice="opt" rep="repeat"><replaceable>CONFIGFILE</replaceable></arg>
     </cmdsynopsis>
 
-    <para><filename>systemd-tmpfiles-setup.service</filename></para>
-    <para><filename>systemd-tmpfiles-setup-dev.service</filename></para>
-    <para><filename>systemd-tmpfiles-clean.service</filename></para>
-    <para><filename>systemd-tmpfiles-clean.timer</filename></para>
+    <para>System units:
+<literallayout><filename>systemd-tmpfiles-setup.service</filename>
+<filename>systemd-tmpfiles-setup-dev.service</filename>
+<filename>systemd-tmpfiles-clean.service</filename>
+<filename>systemd-tmpfiles-clean.timer</filename></literallayout></para>
+
+    <para>User units:
+<literallayout><filename>systemd-tmpfiles-setup.service</filename>
+<filename>systemd-tmpfiles-clean.service</filename>
+<filename>systemd-tmpfiles-clean.timer</filename></literallayout></para>
   </refsynopsisdiv>
 
   <refsect1>

presets/meson.build

@@ -17,3 +17,6 @@
 
 install_data('90-systemd.preset',
              install_dir : systempresetdir)
+
+install_data('user/90-systemd.preset',
+             install_dir : userpresetdir)

presets/user/90-systemd.preset

@@ -0,0 +1,14 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+# These ones should be enabled by default, even if distributions
+# generally follow a default-off policy.
+
+enable systemd-tmpfiles-setup.service
+enable systemd-tmpfiles-clean.timer

units/user/meson.build

@@ -29,6 +29,7 @@ units = [
         'sockets.target',
         'sound.target',
         'timers.target',
+        'systemd-tmpfiles-clean.timer',
 ]
 
 foreach file : units
@@ -38,6 +39,8 @@ endforeach
 
 in_units = [
         'systemd-exit.service',
+        'systemd-tmpfiles-clean.service',
+        'systemd-tmpfiles-setup.service',
 ]
 
 foreach file : in_units

units/user/systemd-tmpfiles-clean.service.in

@@ -0,0 +1,21 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Cleanup of User's Temporary Files and Directories
+Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
+DefaultDependencies=no
+Conflicts=shutdown.target
+Before=basic.target shutdown.target
+
+[Service]
+Type=oneshot
+ExecStart=@rootbindir@/systemd-tmpfiles --user --clean
+SuccessExitStatus=65
+IOSchedulingClass=idle

units/user/systemd-tmpfiles-clean.timer

@@ -0,0 +1,19 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Daily Cleanup of User's Temporary Directories
+Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
+
+[Timer]
+OnStartupSec=5min
+OnUnitActiveSec=1d
+
+[Install]
+WantedBy=timers.target

units/user/systemd-tmpfiles-setup.service.in

@@ -0,0 +1,25 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Create User's Volatile Files and Directories
+Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
+DefaultDependencies=no
+Conflicts=shutdown.target
+Before=basic.target shutdown.target
+RefuseManualStop=yes
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=@rootbindir@/systemd-tmpfiles --user --create --remove --boot
+SuccessExitStatus=65
+
+[Install]
+WantedBy=basic.target