core: fix confusing logging of instantaneous jobs

For instantaneous jobs (e.g. starting of targets, sockets, slices, or
Type=simple services) the log shows the job completion
before starting:

        systemd[1]: Created slice -.slice.
        systemd[1]: Starting -.slice.
        systemd[1]: Created slice System Slice.
        systemd[1]: Starting System Slice.
        systemd[1]: Listening on Journal Audit Socket.
        systemd[1]: Starting Journal Audit Socket.
        systemd[1]: Reached target Timers.
        systemd[1]: Starting Timers.
        ...

The reason is that the job completes before the ->start() method returns
and only then does unit_start() print the "Starting ..." message.
The same thing happens when stopping units.

Rather than fixing the order of the messages, let's just not emit the
Starting/Stopping message at all when the job completes instantaneously.
The job completion message is sufficient in this case.

1 files changed, 12 insertions, 24 deletions

diff --git a/src/core/unit.c b/src/core/unit.c
index fac017c57d..4f5132586c 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -1413,6 +1413,15 @@ static void unit_status_log_starting_stopping_reloading(Unit *u, JobType t) {
                    NULL);
 }
 
+void unit_status_emit_starting_stopping_reloading(Unit *u, JobType t) {
+
+        unit_status_log_starting_stopping_reloading(u, t);
+
+        /* Reload status messages have traditionally not been printed to console. */
+        if (t != JOB_RELOAD)
+                unit_status_print_starting_stopping(u, t);
+}
+
 /* Errors:
  *         -EBADR:     This unit type does not support starting.
  *         -EALREADY:  Unit is already started.
@@ -1423,7 +1432,6 @@ static void unit_status_log_starting_stopping_reloading(Unit *u, JobType t) {
 int unit_start(Unit *u) {
         UnitActiveState state;
         Unit *following;
-        int r;
 
         assert(u);
 
@@ -1477,14 +1485,7 @@ int unit_start(Unit *u) {
 
         unit_add_to_dbus_queue(u);
 
-        r = UNIT_VTABLE(u)->start(u);
-        if (r <= 0)
-                return r;
-
-        /* Log if the start function actually did something */
-        unit_status_log_starting_stopping_reloading(u, JOB_START);
-        unit_status_print_starting_stopping(u, JOB_START);
-        return r;
+        return UNIT_VTABLE(u)->start(u);
 }
 
 bool unit_can_start(Unit *u) {
@@ -1508,7 +1509,6 @@ bool unit_can_isolate(Unit *u) {
 int unit_stop(Unit *u) {
         UnitActiveState state;
         Unit *following;
-        int r;
 
         assert(u);
 
@@ -1527,13 +1527,7 @@ int unit_stop(Unit *u) {
 
         unit_add_to_dbus_queue(u);
 
-        r = UNIT_VTABLE(u)->stop(u);
-        if (r <= 0)
-                return r;
-
-        unit_status_log_starting_stopping_reloading(u, JOB_STOP);
-        unit_status_print_starting_stopping(u, JOB_STOP);
-        return r;
+        return UNIT_VTABLE(u)->stop(u);
 }
 
 /* Errors:
@@ -1544,7 +1538,6 @@ int unit_stop(Unit *u) {
 int unit_reload(Unit *u) {
         UnitActiveState state;
         Unit *following;
-        int r;
 
         assert(u);
 
@@ -1571,12 +1564,7 @@ int unit_reload(Unit *u) {
 
         unit_add_to_dbus_queue(u);
 
-        r = UNIT_VTABLE(u)->reload(u);
-        if (r <= 0)
-                return r;
-
-        unit_status_log_starting_stopping_reloading(u, JOB_RELOAD);
-        return r;
+        return UNIT_VTABLE(u)->reload(u);
 }
 
 bool unit_can_reload(Unit *u) {