Merge pull request #15526 from bluca/start_stop_wait_debug

Add debug log when a job in the activation queue is not runnable

Author: keszybz

src/core/job.c

@@ -516,12 +516,20 @@ static bool job_is_runnable(Job *j) {
                 return true;
 
         HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_AFTER], i)
-                if (other->job && job_compare(j, other->job, UNIT_AFTER) > 0)
+                if (other->job && job_compare(j, other->job, UNIT_AFTER) > 0) {
+                        log_unit_debug(j->unit,
+                                       "starting held back, waiting for: %s",
+                                       other->id);
                         return false;
+                }
 
         HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_BEFORE], i)
-                if (other->job && job_compare(j, other->job, UNIT_BEFORE) > 0)
+                if (other->job && job_compare(j, other->job, UNIT_BEFORE) > 0) {
+                        log_unit_debug(j->unit,
+                                       "stopping held back, waiting for: %s",
+                                       other->id);
                         return false;
+                }
 
         return true;
 }

src/core/unit.h

@@ -883,8 +883,9 @@ int unit_can_clean(Unit *u, ExecCleanMask *ret_mask);
 #define log_unit_full(unit, level, error, ...)                          \
         ({                                                              \
                 const Unit *_u = (unit);                                \
-                _u ? log_object_internal(level, error, PROJECT_FILE, __LINE__, __func__, _u->manager->unit_log_field, _u->id, _u->manager->invocation_log_field, _u->invocation_id_string, ##__VA_ARGS__) : \
-                        log_internal(level, error, PROJECT_FILE, __LINE__, __func__, ##__VA_ARGS__); \
+                (log_get_max_level() < LOG_PRI(level)) ? -ERRNO_VALUE(error) : \
+                        _u ? log_object_internal(level, error, PROJECT_FILE, __LINE__, __func__, _u->manager->unit_log_field, _u->id, _u->manager->invocation_log_field, _u->invocation_id_string, ##__VA_ARGS__) : \
+                                log_internal(level, error, PROJECT_FILE, __LINE__, __func__, ##__VA_ARGS__); \
         })
 
 #define log_unit_debug(unit, ...)   log_unit_full(unit, LOG_DEBUG, 0, ##__VA_ARGS__)