logind: split %t directory creation to a helper unit

Unfortunately this needs a new binary to do the mount because there's just
too many special steps to outsource this to systemd-mount:
- EPERM needs to be treated specially
- UserRuntimeDir= setting must be obeyed
- SELinux label must be adjusted

This allows user@.service to be started independently of logind.
So 'systemctl start user@nnn' will start the user manager for user nnn.
Logind will start it too when the user logs in, and will stop it (unless
lingering is enabled) when the user logs out.

Fixes #7339.

1 files changed, 17 insertions, 0 deletions

diff --git a/units/user-runtime-dir@.service.in b/units/user-runtime-dir@.service.in
new file mode 100644
index 0000000000..8c02beda3b
--- /dev/null
+++ b/units/user-runtime-dir@.service.in
@@ -0,0 +1,17 @@
+#  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=/run/user/%i mount wrapper
+StopWhenUnneeded=yes
+
+[Service]
+ExecStart=@rootlibexecdir@/systemd-user-runtime-dir start %i
+ExecStop=@rootlibexecdir@/systemd-user-runtime-dir stop %i
+RemainAfterExit=true