core: move enforcement of the start limit into per-unit-type code again

Let's move the enforcement of the per-unit start limit from unit.c into the
type-specific files again. For unit types that know a concept of "result" codes
this allows us to hook up the start limit condition to it with an explicit
result code. Also, this makes sure that the state checks in clal like
service_start() may be done before the start limit is checked, as the start
limit really should be checked last, right before everything has been verified
to be in order.

The generic start limit logic is left in unit.c, but the invocation of it is
moved into the per-type files, in the various xyz_start() functions, so that
they may place the check at the right location.

Note that this change drops the enforcement entirely from device, slice, target
and scope units, since these unit types generally may not fail activation, or
may only be activated a single time. This is also documented now.

Note that restores the "start-limit-hit" result code that existed before
6bf0f408e4833152197fb38fb10a9989c89f3a59 already in the service code. However,
it's not introduced for all units that have a result code concept.

Fixes #3166.

1 files changed, 1 insertions, 7 deletions

diff --git a/src/core/unit.c b/src/core/unit.c
index 64466e4fb4..fd9ecc36ce 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -1462,7 +1462,7 @@ void unit_status_emit_starting_stopping_reloading(Unit *u, JobType t) {
         unit_status_print_starting_stopping(u, t);
 }
 
-static int unit_start_limit_test(Unit *u) {
+int unit_start_limit_test(Unit *u) {
         assert(u);
 
         if (ratelimit_test(&u->start_limit)) {
@@ -1488,7 +1488,6 @@ static int unit_start_limit_test(Unit *u) {
 int unit_start(Unit *u) {
         UnitActiveState state;
         Unit *following;
-        int r;
 
         assert(u);
 
@@ -1541,11 +1540,6 @@ int unit_start(Unit *u) {
         if (!UNIT_VTABLE(u)->start)
                 return -EBADR;
 
-        /* Make sure we don't enter a busy loop of some kind. */
-        r = unit_start_limit_test(u);
-        if (r < 0)
-                return r;
-
         /* We don't suppress calls to ->start() here when we are
          * already starting, to allow this request to be used as a
          * "hurry up" call, for example when the unit is in some "auto