service: Demote log level of NotifyAccess= messages to debug

The situation is a service like

        Type=notify
        NotifyAccess=main

and the service uses some of the systemd helper utilities, e.g.
coredumpctl. The service process will pass NOTIFY_SOCKET to the helper
child (accidentally) and the result is a spurious notification and
the warning message:

> Jan 18 09:38:01 host systemd[1]: sdnotify.service: Got notification message from PID 13736, but reception only permitted for main PID 13549

Notification from helpers seem like an unintentional composition of the
commit c118b577fa ("coredumpctl: define main through macro") and commit
6b636c2d27 ("main-func: send main exit code to parent via sd_notify() on
exit"). The former used the handy macro for a main function, the latter
equipped any main function with the notification. (Further extended in
the commit 623a00020f ("notify: Add EXIT_STATUS field").)

Since notification from systemd utitilities are meant to extend
rudimentary exit()/wait() pair generally, they may happen to land into
service's NOTIFY_SOCKET. Tone down messages of notification that won't
match NotifyAccess=.

diff --git a/src/core/service.c b/src/core/service.c
index d2b8c18af1687068f880b36dd3f4818930ba5bdc..7809c6a5119f5271767c2335a658dc8d32494dae 100644 (file)
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -4313,29 +4313,30 @@ static bool service_notify_message_authorized(Service *s, pid_t pid, FDSet *fds)
         NotifyAccess notify_access = service_get_notify_access(s);
 
         if (notify_access == NOTIFY_NONE) {
+                /* Warn level only if no notifications are expected */
                 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception is disabled.", pid);
                 return false;
         }
 
         if (notify_access == NOTIFY_MAIN && pid != s->main_pid.pid) {
                 if (pidref_is_set(&s->main_pid))
-                        log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid.pid);
+                        log_unit_debug(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid.pid);
                 else
-                        log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID which is currently not known", pid);
+                        log_unit_debug(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID which is currently not known", pid);
 
                 return false;
         }
 
         if (notify_access == NOTIFY_EXEC && pid != s->main_pid.pid && pid != s->control_pid.pid) {
                 if (pidref_is_set(&s->main_pid) && pidref_is_set(&s->control_pid))
-                        log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT" and control PID "PID_FMT,
+                        log_unit_debug(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT" and control PID "PID_FMT,
                                          pid, s->main_pid.pid, s->control_pid.pid);
                 else if (pidref_is_set(&s->main_pid))
-                        log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid.pid);
+                        log_unit_debug(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid.pid);
                 else if (pidref_is_set(&s->control_pid))
-                        log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for control PID "PID_FMT, pid, s->control_pid.pid);
+                        log_unit_debug(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for control PID "PID_FMT, pid, s->control_pid.pid);
                 else
-                        log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID and control PID which are currently not known", pid);
+                        log_unit_debug(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID and control PID which are currently not known", pid);
 
                 return false;
         }