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core: rename unit_destroy_cgroup() to unit_destroy_cgroup_if_empty() since it's not...
[elogind.git] / src / core / unit.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4   This file is part of systemd.
5
6   Copyright 2010 Lennart Poettering
7
8   systemd is free software; you can redistribute it and/or modify it
9   under the terms of the GNU Lesser General Public License as published by
10   the Free Software Foundation; either version 2.1 of the License, or
11   (at your option) any later version.
12
13   systemd is distributed in the hope that it will be useful, but
14   WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16   Lesser General Public License for more details.
17
18   You should have received a copy of the GNU Lesser General Public License
19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <assert.h>
23 #include <errno.h>
24 #include <string.h>
25 #include <sys/epoll.h>
26 #include <sys/timerfd.h>
27 #include <sys/poll.h>
28 #include <stdlib.h>
29 #include <unistd.h>
30 #include <sys/stat.h>
31
32 #include "sd-id128.h"
33 #include "sd-messages.h"
34 #include "set.h"
35 #include "unit.h"
36 #include "macro.h"
37 #include "strv.h"
38 #include "path-util.h"
39 #include "load-fragment.h"
40 #include "load-dropin.h"
41 #include "log.h"
42 #include "unit-name.h"
43 #include "dbus-unit.h"
44 #include "special.h"
45 #include "cgroup-util.h"
46 #include "missing.h"
47 #include "mkdir.h"
48 #include "label.h"
49 #include "fileio-label.h"
50 #include "bus-errors.h"
51 #include "dbus.h"
52 #include "execute.h"
53 #include "virt.h"
54 #include "dropin.h"
55
56 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
57         [UNIT_SERVICE] = &service_vtable,
58         [UNIT_SOCKET] = &socket_vtable,
59         [UNIT_BUSNAME] = &busname_vtable,
60         [UNIT_TARGET] = &target_vtable,
61         [UNIT_SNAPSHOT] = &snapshot_vtable,
62         [UNIT_DEVICE] = &device_vtable,
63         [UNIT_MOUNT] = &mount_vtable,
64         [UNIT_AUTOMOUNT] = &automount_vtable,
65         [UNIT_SWAP] = &swap_vtable,
66         [UNIT_TIMER] = &timer_vtable,
67         [UNIT_PATH] = &path_vtable,
68         [UNIT_SLICE] = &slice_vtable,
69         [UNIT_SCOPE] = &scope_vtable
70 };
71
72 static int maybe_warn_about_dependency(const char *id, const char *other, UnitDependency dependency);
73
74 Unit *unit_new(Manager *m, size_t size) {
75         Unit *u;
76
77         assert(m);
78         assert(size >= sizeof(Unit));
79
80         u = malloc0(size);
81         if (!u)
82                 return NULL;
83
84         u->names = set_new(&string_hash_ops);
85         if (!u->names) {
86                 free(u);
87                 return NULL;
88         }
89
90         u->manager = m;
91         u->type = _UNIT_TYPE_INVALID;
92         u->deserialized_job = _JOB_TYPE_INVALID;
93         u->default_dependencies = true;
94         u->unit_file_state = _UNIT_FILE_STATE_INVALID;
95         u->unit_file_preset = -1;
96         u->on_failure_job_mode = JOB_REPLACE;
97
98         return u;
99 }
100
101 bool unit_has_name(Unit *u, const char *name) {
102         assert(u);
103         assert(name);
104
105         return !!set_get(u->names, (char*) name);
106 }
107
108 static void unit_init(Unit *u) {
109         CGroupContext *cc;
110         ExecContext *ec;
111         KillContext *kc;
112
113         assert(u);
114         assert(u->manager);
115         assert(u->type >= 0);
116
117         cc = unit_get_cgroup_context(u);
118         if (cc) {
119                 cgroup_context_init(cc);
120
121                 /* Copy in the manager defaults into the cgroup
122                  * context, _before_ the rest of the settings have
123                  * been initialized */
124
125                 cc->cpu_accounting = u->manager->default_cpu_accounting;
126                 cc->blockio_accounting = u->manager->default_blockio_accounting;
127                 cc->memory_accounting = u->manager->default_memory_accounting;
128         }
129
130         ec = unit_get_exec_context(u);
131         if (ec)
132                 exec_context_init(ec);
133
134         kc = unit_get_kill_context(u);
135         if (kc)
136                 kill_context_init(kc);
137
138         if (UNIT_VTABLE(u)->init)
139                 UNIT_VTABLE(u)->init(u);
140 }
141
142 int unit_add_name(Unit *u, const char *text) {
143         _cleanup_free_ char *s = NULL, *i = NULL;
144         UnitType t;
145         int r;
146
147         assert(u);
148         assert(text);
149
150         if (unit_name_is_template(text)) {
151
152                 if (!u->instance)
153                         return -EINVAL;
154
155                 s = unit_name_replace_instance(text, u->instance);
156         } else
157                 s = strdup(text);
158         if (!s)
159                 return -ENOMEM;
160
161         if (!unit_name_is_valid(s, TEMPLATE_INVALID))
162                 return -EINVAL;
163
164         assert_se((t = unit_name_to_type(s)) >= 0);
165
166         if (u->type != _UNIT_TYPE_INVALID && t != u->type)
167                 return -EINVAL;
168
169         r = unit_name_to_instance(s, &i);
170         if (r < 0)
171                 return r;
172
173         if (i && unit_vtable[t]->no_instances)
174                 return -EINVAL;
175
176         /* Ensure that this unit is either instanced or not instanced,
177          * but not both. */
178         if (u->type != _UNIT_TYPE_INVALID && !u->instance != !i)
179                 return -EINVAL;
180
181         if (unit_vtable[t]->no_alias &&
182             !set_isempty(u->names) &&
183             !set_get(u->names, s))
184                 return -EEXIST;
185
186         if (hashmap_size(u->manager->units) >= MANAGER_MAX_NAMES)
187                 return -E2BIG;
188
189         r = set_put(u->names, s);
190         if (r < 0) {
191                 if (r == -EEXIST)
192                         return 0;
193
194                 return r;
195         }
196
197         r = hashmap_put(u->manager->units, s, u);
198         if (r < 0) {
199                 set_remove(u->names, s);
200                 return r;
201         }
202
203         if (u->type == _UNIT_TYPE_INVALID) {
204                 u->type = t;
205                 u->id = s;
206                 u->instance = i;
207
208                 LIST_PREPEND(units_by_type, u->manager->units_by_type[t], u);
209
210                 unit_init(u);
211
212                 i = NULL;
213         }
214
215         s = NULL;
216
217         unit_add_to_dbus_queue(u);
218         return 0;
219 }
220
221 int unit_choose_id(Unit *u, const char *name) {
222         _cleanup_free_ char *t = NULL;
223         char *s, *i;
224         int r;
225
226         assert(u);
227         assert(name);
228
229         if (unit_name_is_template(name)) {
230
231                 if (!u->instance)
232                         return -EINVAL;
233
234                 t = unit_name_replace_instance(name, u->instance);
235                 if (!t)
236                         return -ENOMEM;
237
238                 name = t;
239         }
240
241         /* Selects one of the names of this unit as the id */
242         s = set_get(u->names, (char*) name);
243         if (!s)
244                 return -ENOENT;
245
246         r = unit_name_to_instance(s, &i);
247         if (r < 0)
248                 return r;
249
250         u->id = s;
251
252         free(u->instance);
253         u->instance = i;
254
255         unit_add_to_dbus_queue(u);
256
257         return 0;
258 }
259
260 int unit_set_description(Unit *u, const char *description) {
261         char *s;
262
263         assert(u);
264
265         if (isempty(description))
266                 s = NULL;
267         else {
268                 s = strdup(description);
269                 if (!s)
270                         return -ENOMEM;
271         }
272
273         free(u->description);
274         u->description = s;
275
276         unit_add_to_dbus_queue(u);
277         return 0;
278 }
279
280 bool unit_check_gc(Unit *u) {
281         assert(u);
282
283         if (UNIT_VTABLE(u)->no_gc)
284                 return true;
285
286         if (u->no_gc)
287                 return true;
288
289         if (u->job)
290                 return true;
291
292         if (u->nop_job)
293                 return true;
294
295         if (unit_active_state(u) != UNIT_INACTIVE)
296                 return true;
297
298         if (u->refs)
299                 return true;
300
301         if (UNIT_VTABLE(u)->check_gc)
302                 if (UNIT_VTABLE(u)->check_gc(u))
303                         return true;
304
305         return false;
306 }
307
308 void unit_add_to_load_queue(Unit *u) {
309         assert(u);
310         assert(u->type != _UNIT_TYPE_INVALID);
311
312         if (u->load_state != UNIT_STUB || u->in_load_queue)
313                 return;
314
315         LIST_PREPEND(load_queue, u->manager->load_queue, u);
316         u->in_load_queue = true;
317 }
318
319 void unit_add_to_cleanup_queue(Unit *u) {
320         assert(u);
321
322         if (u->in_cleanup_queue)
323                 return;
324
325         LIST_PREPEND(cleanup_queue, u->manager->cleanup_queue, u);
326         u->in_cleanup_queue = true;
327 }
328
329 void unit_add_to_gc_queue(Unit *u) {
330         assert(u);
331
332         if (u->in_gc_queue || u->in_cleanup_queue)
333                 return;
334
335         if (unit_check_gc(u))
336                 return;
337
338         LIST_PREPEND(gc_queue, u->manager->gc_queue, u);
339         u->in_gc_queue = true;
340
341         u->manager->n_in_gc_queue ++;
342 }
343
344 void unit_add_to_dbus_queue(Unit *u) {
345         assert(u);
346         assert(u->type != _UNIT_TYPE_INVALID);
347
348         if (u->load_state == UNIT_STUB || u->in_dbus_queue)
349                 return;
350
351         /* Shortcut things if nobody cares */
352         if (sd_bus_track_count(u->manager->subscribed) <= 0 &&
353             set_isempty(u->manager->private_buses)) {
354                 u->sent_dbus_new_signal = true;
355                 return;
356         }
357
358         LIST_PREPEND(dbus_queue, u->manager->dbus_unit_queue, u);
359         u->in_dbus_queue = true;
360 }
361
362 static void bidi_set_free(Unit *u, Set *s) {
363         Iterator i;
364         Unit *other;
365
366         assert(u);
367
368         /* Frees the set and makes sure we are dropped from the
369          * inverse pointers */
370
371         SET_FOREACH(other, s, i) {
372                 UnitDependency d;
373
374                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
375                         set_remove(other->dependencies[d], u);
376
377                 unit_add_to_gc_queue(other);
378         }
379
380         set_free(s);
381 }
382
383 static void unit_remove_transient(Unit *u) {
384         char **i;
385
386         assert(u);
387
388         if (!u->transient)
389                 return;
390
391         if (u->fragment_path)
392                 unlink(u->fragment_path);
393
394         STRV_FOREACH(i, u->dropin_paths) {
395                 _cleanup_free_ char *p = NULL;
396                 int r;
397
398                 unlink(*i);
399
400                 r = path_get_parent(*i, &p);
401                 if (r >= 0)
402                         rmdir(p);
403         }
404 }
405
406 static void unit_free_requires_mounts_for(Unit *u) {
407         char **j;
408
409         STRV_FOREACH(j, u->requires_mounts_for) {
410                 char s[strlen(*j) + 1];
411
412                 PATH_FOREACH_PREFIX_MORE(s, *j) {
413                         char *y;
414                         Set *x;
415
416                         x = hashmap_get2(u->manager->units_requiring_mounts_for, s, (void**) &y);
417                         if (!x)
418                                 continue;
419
420                         set_remove(x, u);
421
422                         if (set_isempty(x)) {
423                                 hashmap_remove(u->manager->units_requiring_mounts_for, y);
424                                 free(y);
425                                 set_free(x);
426                         }
427                 }
428         }
429
430         strv_free(u->requires_mounts_for);
431         u->requires_mounts_for = NULL;
432 }
433
434 static void unit_done(Unit *u) {
435         ExecContext *ec;
436         CGroupContext *cc;
437
438         assert(u);
439
440         if (u->type < 0)
441                 return;
442
443         if (UNIT_VTABLE(u)->done)
444                 UNIT_VTABLE(u)->done(u);
445
446         ec = unit_get_exec_context(u);
447         if (ec)
448                 exec_context_done(ec);
449
450         cc = unit_get_cgroup_context(u);
451         if (cc)
452                 cgroup_context_done(cc);
453 }
454
455 void unit_free(Unit *u) {
456         UnitDependency d;
457         Iterator i;
458         char *t;
459
460         assert(u);
461
462         if (u->manager->n_reloading <= 0)
463                 unit_remove_transient(u);
464
465         bus_unit_send_removed_signal(u);
466
467         unit_done(u);
468
469         unit_free_requires_mounts_for(u);
470
471         SET_FOREACH(t, u->names, i)
472                 hashmap_remove_value(u->manager->units, t, u);
473
474         if (u->job) {
475                 Job *j = u->job;
476                 job_uninstall(j);
477                 job_free(j);
478         }
479
480         if (u->nop_job) {
481                 Job *j = u->nop_job;
482                 job_uninstall(j);
483                 job_free(j);
484         }
485
486         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
487                 bidi_set_free(u, u->dependencies[d]);
488
489         if (u->type != _UNIT_TYPE_INVALID)
490                 LIST_REMOVE(units_by_type, u->manager->units_by_type[u->type], u);
491
492         if (u->in_load_queue)
493                 LIST_REMOVE(load_queue, u->manager->load_queue, u);
494
495         if (u->in_dbus_queue)
496                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
497
498         if (u->in_cleanup_queue)
499                 LIST_REMOVE(cleanup_queue, u->manager->cleanup_queue, u);
500
501         if (u->in_gc_queue) {
502                 LIST_REMOVE(gc_queue, u->manager->gc_queue, u);
503                 u->manager->n_in_gc_queue--;
504         }
505
506         if (u->in_cgroup_queue)
507                 LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u);
508
509         if (u->cgroup_path) {
510                 hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
511                 free(u->cgroup_path);
512         }
513
514         set_remove(u->manager->failed_units, u);
515         set_remove(u->manager->startup_units, u);
516
517         free(u->description);
518         strv_free(u->documentation);
519         free(u->fragment_path);
520         free(u->source_path);
521         strv_free(u->dropin_paths);
522         free(u->instance);
523
524         free(u->job_timeout_reboot_arg);
525
526         set_free_free(u->names);
527
528         unit_unwatch_all_pids(u);
529
530         condition_free_list(u->conditions);
531         condition_free_list(u->asserts);
532
533         unit_ref_unset(&u->slice);
534
535         while (u->refs)
536                 unit_ref_unset(u->refs);
537
538         free(u);
539 }
540
541 UnitActiveState unit_active_state(Unit *u) {
542         assert(u);
543
544         if (u->load_state == UNIT_MERGED)
545                 return unit_active_state(unit_follow_merge(u));
546
547         /* After a reload it might happen that a unit is not correctly
548          * loaded but still has a process around. That's why we won't
549          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
550
551         return UNIT_VTABLE(u)->active_state(u);
552 }
553
554 const char* unit_sub_state_to_string(Unit *u) {
555         assert(u);
556
557         return UNIT_VTABLE(u)->sub_state_to_string(u);
558 }
559
560 static int complete_move(Set **s, Set **other) {
561         int r;
562
563         assert(s);
564         assert(other);
565
566         if (!*other)
567                 return 0;
568
569         if (*s) {
570                 r = set_move(*s, *other);
571                 if (r < 0)
572                         return r;
573         } else {
574                 *s = *other;
575                 *other = NULL;
576         }
577
578         return 0;
579 }
580
581 static int merge_names(Unit *u, Unit *other) {
582         char *t;
583         Iterator i;
584         int r;
585
586         assert(u);
587         assert(other);
588
589         r = complete_move(&u->names, &other->names);
590         if (r < 0)
591                 return r;
592
593         set_free_free(other->names);
594         other->names = NULL;
595         other->id = NULL;
596
597         SET_FOREACH(t, u->names, i)
598                 assert_se(hashmap_replace(u->manager->units, t, u) == 0);
599
600         return 0;
601 }
602
603 static int reserve_dependencies(Unit *u, Unit *other, UnitDependency d) {
604         unsigned n_reserve;
605
606         assert(u);
607         assert(other);
608         assert(d < _UNIT_DEPENDENCY_MAX);
609
610         /*
611          * If u does not have this dependency set allocated, there is no need
612          * to reserve anything. In that case other's set will be transfered
613          * as a whole to u by complete_move().
614          */
615         if (!u->dependencies[d])
616                 return 0;
617
618         /* merge_dependencies() will skip a u-on-u dependency */
619         n_reserve = set_size(other->dependencies[d]) - !!set_get(other->dependencies[d], u);
620
621         return set_reserve(u->dependencies[d], n_reserve);
622 }
623
624 static void merge_dependencies(Unit *u, Unit *other, const char *other_id, UnitDependency d) {
625         Iterator i;
626         Unit *back;
627         int r;
628
629         assert(u);
630         assert(other);
631         assert(d < _UNIT_DEPENDENCY_MAX);
632
633         /* Fix backwards pointers */
634         SET_FOREACH(back, other->dependencies[d], i) {
635                 UnitDependency k;
636
637                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++) {
638                         /* Do not add dependencies between u and itself */
639                         if (back == u) {
640                                 if (set_remove(back->dependencies[k], other))
641                                         maybe_warn_about_dependency(u->id, other_id, k);
642                         } else {
643                                 r = set_remove_and_put(back->dependencies[k], other, u);
644                                 if (r == -EEXIST)
645                                         set_remove(back->dependencies[k], other);
646                                 else
647                                         assert(r >= 0 || r == -ENOENT);
648                         }
649                 }
650         }
651
652         /* Also do not move dependencies on u to itself */
653         back = set_remove(other->dependencies[d], u);
654         if (back)
655                 maybe_warn_about_dependency(u->id, other_id, d);
656
657         /* The move cannot fail. The caller must have performed a reservation. */
658         assert_se(complete_move(&u->dependencies[d], &other->dependencies[d]) == 0);
659
660         set_free(other->dependencies[d]);
661         other->dependencies[d] = NULL;
662 }
663
664 int unit_merge(Unit *u, Unit *other) {
665         UnitDependency d;
666         const char *other_id = NULL;
667         int r;
668
669         assert(u);
670         assert(other);
671         assert(u->manager == other->manager);
672         assert(u->type != _UNIT_TYPE_INVALID);
673
674         other = unit_follow_merge(other);
675
676         if (other == u)
677                 return 0;
678
679         if (u->type != other->type)
680                 return -EINVAL;
681
682         if (!u->instance != !other->instance)
683                 return -EINVAL;
684
685         if (other->load_state != UNIT_STUB &&
686             other->load_state != UNIT_NOT_FOUND)
687                 return -EEXIST;
688
689         if (other->job)
690                 return -EEXIST;
691
692         if (other->nop_job)
693                 return -EEXIST;
694
695         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
696                 return -EEXIST;
697
698         if (other->id)
699                 other_id = strdupa(other->id);
700
701         /* Make reservations to ensure merge_dependencies() won't fail */
702         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
703                 r = reserve_dependencies(u, other, d);
704                 /*
705                  * We don't rollback reservations if we fail. We don't have
706                  * a way to undo reservations. A reservation is not a leak.
707                  */
708                 if (r < 0)
709                         return r;
710         }
711
712         /* Merge names */
713         r = merge_names(u, other);
714         if (r < 0)
715                 return r;
716
717         /* Redirect all references */
718         while (other->refs)
719                 unit_ref_set(other->refs, u);
720
721         /* Merge dependencies */
722         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
723                 merge_dependencies(u, other, other_id, d);
724
725         other->load_state = UNIT_MERGED;
726         other->merged_into = u;
727
728         /* If there is still some data attached to the other node, we
729          * don't need it anymore, and can free it. */
730         if (other->load_state != UNIT_STUB)
731                 if (UNIT_VTABLE(other)->done)
732                         UNIT_VTABLE(other)->done(other);
733
734         unit_add_to_dbus_queue(u);
735         unit_add_to_cleanup_queue(other);
736
737         return 0;
738 }
739
740 int unit_merge_by_name(Unit *u, const char *name) {
741         Unit *other;
742         int r;
743         _cleanup_free_ char *s = NULL;
744
745         assert(u);
746         assert(name);
747
748         if (unit_name_is_template(name)) {
749                 if (!u->instance)
750                         return -EINVAL;
751
752                 s = unit_name_replace_instance(name, u->instance);
753                 if (!s)
754                         return -ENOMEM;
755
756                 name = s;
757         }
758
759         other = manager_get_unit(u->manager, name);
760         if (!other)
761                 r = unit_add_name(u, name);
762         else
763                 r = unit_merge(u, other);
764
765         return r;
766 }
767
768 Unit* unit_follow_merge(Unit *u) {
769         assert(u);
770
771         while (u->load_state == UNIT_MERGED)
772                 assert_se(u = u->merged_into);
773
774         return u;
775 }
776
777 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
778         int r;
779
780         assert(u);
781         assert(c);
782
783         if (c->working_directory) {
784                 r = unit_require_mounts_for(u, c->working_directory);
785                 if (r < 0)
786                         return r;
787         }
788
789         if (c->root_directory) {
790                 r = unit_require_mounts_for(u, c->root_directory);
791                 if (r < 0)
792                         return r;
793         }
794
795         if (u->manager->running_as != SYSTEMD_SYSTEM)
796                 return 0;
797
798         if (c->private_tmp) {
799                 r = unit_require_mounts_for(u, "/tmp");
800                 if (r < 0)
801                         return r;
802
803                 r = unit_require_mounts_for(u, "/var/tmp");
804                 if (r < 0)
805                         return r;
806         }
807
808         if (c->std_output != EXEC_OUTPUT_KMSG &&
809             c->std_output != EXEC_OUTPUT_SYSLOG &&
810             c->std_output != EXEC_OUTPUT_JOURNAL &&
811             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
812             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
813             c->std_output != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
814             c->std_error != EXEC_OUTPUT_KMSG &&
815             c->std_error != EXEC_OUTPUT_SYSLOG &&
816             c->std_error != EXEC_OUTPUT_JOURNAL &&
817             c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
818             c->std_error != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
819             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
820                 return 0;
821
822         /* If syslog or kernel logging is requested, make sure our own
823          * logging daemon is run first. */
824
825         r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_JOURNALD_SOCKET, NULL, true);
826         if (r < 0)
827                 return r;
828
829         return 0;
830 }
831
832 const char *unit_description(Unit *u) {
833         assert(u);
834
835         if (u->description)
836                 return u->description;
837
838         return strna(u->id);
839 }
840
841 void unit_dump(Unit *u, FILE *f, const char *prefix) {
842         char *t, **j;
843         UnitDependency d;
844         Iterator i;
845         const char *prefix2;
846         char
847                 timestamp1[FORMAT_TIMESTAMP_MAX],
848                 timestamp2[FORMAT_TIMESTAMP_MAX],
849                 timestamp3[FORMAT_TIMESTAMP_MAX],
850                 timestamp4[FORMAT_TIMESTAMP_MAX],
851                 timespan[FORMAT_TIMESPAN_MAX];
852         Unit *following;
853         _cleanup_set_free_ Set *following_set = NULL;
854         int r;
855
856         assert(u);
857         assert(u->type >= 0);
858
859         prefix = strempty(prefix);
860         prefix2 = strappenda(prefix, "\t");
861
862         fprintf(f,
863                 "%s-> Unit %s:\n"
864                 "%s\tDescription: %s\n"
865                 "%s\tInstance: %s\n"
866                 "%s\tUnit Load State: %s\n"
867                 "%s\tUnit Active State: %s\n"
868                 "%s\tInactive Exit Timestamp: %s\n"
869                 "%s\tActive Enter Timestamp: %s\n"
870                 "%s\tActive Exit Timestamp: %s\n"
871                 "%s\tInactive Enter Timestamp: %s\n"
872                 "%s\tGC Check Good: %s\n"
873                 "%s\tNeed Daemon Reload: %s\n"
874                 "%s\tTransient: %s\n"
875                 "%s\tSlice: %s\n"
876                 "%s\tCGroup: %s\n"
877                 "%s\tCGroup realized: %s\n"
878                 "%s\tCGroup mask: 0x%x\n"
879                 "%s\tCGroup members mask: 0x%x\n",
880                 prefix, u->id,
881                 prefix, unit_description(u),
882                 prefix, strna(u->instance),
883                 prefix, unit_load_state_to_string(u->load_state),
884                 prefix, unit_active_state_to_string(unit_active_state(u)),
885                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->inactive_exit_timestamp.realtime)),
886                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->active_enter_timestamp.realtime)),
887                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->active_exit_timestamp.realtime)),
888                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->inactive_enter_timestamp.realtime)),
889                 prefix, yes_no(unit_check_gc(u)),
890                 prefix, yes_no(unit_need_daemon_reload(u)),
891                 prefix, yes_no(u->transient),
892                 prefix, strna(unit_slice_name(u)),
893                 prefix, strna(u->cgroup_path),
894                 prefix, yes_no(u->cgroup_realized),
895                 prefix, u->cgroup_realized_mask,
896                 prefix, u->cgroup_members_mask);
897
898         SET_FOREACH(t, u->names, i)
899                 fprintf(f, "%s\tName: %s\n", prefix, t);
900
901         STRV_FOREACH(j, u->documentation)
902                 fprintf(f, "%s\tDocumentation: %s\n", prefix, *j);
903
904         following = unit_following(u);
905         if (following)
906                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->id);
907
908         r = unit_following_set(u, &following_set);
909         if (r >= 0) {
910                 Unit *other;
911
912                 SET_FOREACH(other, following_set, i)
913                         fprintf(f, "%s\tFollowing Set Member: %s\n", prefix, other->id);
914         }
915
916         if (u->fragment_path)
917                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->fragment_path);
918
919         if (u->source_path)
920                 fprintf(f, "%s\tSource Path: %s\n", prefix, u->source_path);
921
922         STRV_FOREACH(j, u->dropin_paths)
923                 fprintf(f, "%s\tDropIn Path: %s\n", prefix, *j);
924
925         if (u->job_timeout > 0)
926                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->job_timeout, 0));
927
928         if (u->job_timeout_action != FAILURE_ACTION_NONE)
929                 fprintf(f, "%s\tJob Timeout Action: %s\n", prefix, failure_action_to_string(u->job_timeout_action));
930
931         if (u->job_timeout_reboot_arg)
932                 fprintf(f, "%s\tJob Timeout Reboot Argument: %s\n", prefix, u->job_timeout_reboot_arg);
933
934         condition_dump_list(u->conditions, f, prefix, condition_type_to_string);
935         condition_dump_list(u->asserts, f, prefix, assert_type_to_string);
936
937         if (dual_timestamp_is_set(&u->condition_timestamp))
938                 fprintf(f,
939                         "%s\tCondition Timestamp: %s\n"
940                         "%s\tCondition Result: %s\n",
941                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->condition_timestamp.realtime)),
942                         prefix, yes_no(u->condition_result));
943
944         if (dual_timestamp_is_set(&u->assert_timestamp))
945                 fprintf(f,
946                         "%s\tAssert Timestamp: %s\n"
947                         "%s\tAssert Result: %s\n",
948                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->assert_timestamp.realtime)),
949                         prefix, yes_no(u->assert_result));
950
951         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
952                 Unit *other;
953
954                 SET_FOREACH(other, u->dependencies[d], i)
955                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->id);
956         }
957
958         if (!strv_isempty(u->requires_mounts_for)) {
959                 fprintf(f,
960                         "%s\tRequiresMountsFor:", prefix);
961
962                 STRV_FOREACH(j, u->requires_mounts_for)
963                         fprintf(f, " %s", *j);
964
965                 fputs("\n", f);
966         }
967
968         if (u->load_state == UNIT_LOADED) {
969
970                 fprintf(f,
971                         "%s\tStopWhenUnneeded: %s\n"
972                         "%s\tRefuseManualStart: %s\n"
973                         "%s\tRefuseManualStop: %s\n"
974                         "%s\tDefaultDependencies: %s\n"
975                         "%s\tOnFailureJobMode: %s\n"
976                         "%s\tIgnoreOnIsolate: %s\n"
977                         "%s\tIgnoreOnSnapshot: %s\n",
978                         prefix, yes_no(u->stop_when_unneeded),
979                         prefix, yes_no(u->refuse_manual_start),
980                         prefix, yes_no(u->refuse_manual_stop),
981                         prefix, yes_no(u->default_dependencies),
982                         prefix, job_mode_to_string(u->on_failure_job_mode),
983                         prefix, yes_no(u->ignore_on_isolate),
984                         prefix, yes_no(u->ignore_on_snapshot));
985
986                 if (UNIT_VTABLE(u)->dump)
987                         UNIT_VTABLE(u)->dump(u, f, prefix2);
988
989         } else if (u->load_state == UNIT_MERGED)
990                 fprintf(f,
991                         "%s\tMerged into: %s\n",
992                         prefix, u->merged_into->id);
993         else if (u->load_state == UNIT_ERROR)
994                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->load_error));
995
996
997         if (u->job)
998                 job_dump(u->job, f, prefix2);
999
1000         if (u->nop_job)
1001                 job_dump(u->nop_job, f, prefix2);
1002
1003 }
1004
1005 /* Common implementation for multiple backends */
1006 int unit_load_fragment_and_dropin(Unit *u) {
1007         int r;
1008
1009         assert(u);
1010
1011         /* Load a .{service,socket,...} file */
1012         r = unit_load_fragment(u);
1013         if (r < 0)
1014                 return r;
1015
1016         if (u->load_state == UNIT_STUB)
1017                 return -ENOENT;
1018
1019         /* Load drop-in directory data */
1020         r = unit_load_dropin(unit_follow_merge(u));
1021         if (r < 0)
1022                 return r;
1023
1024         return 0;
1025 }
1026
1027 /* Common implementation for multiple backends */
1028 int unit_load_fragment_and_dropin_optional(Unit *u) {
1029         int r;
1030
1031         assert(u);
1032
1033         /* Same as unit_load_fragment_and_dropin(), but whether
1034          * something can be loaded or not doesn't matter. */
1035
1036         /* Load a .service file */
1037         r = unit_load_fragment(u);
1038         if (r < 0)
1039                 return r;
1040
1041         if (u->load_state == UNIT_STUB)
1042                 u->load_state = UNIT_LOADED;
1043
1044         /* Load drop-in directory data */
1045         r = unit_load_dropin(unit_follow_merge(u));
1046         if (r < 0)
1047                 return r;
1048
1049         return 0;
1050 }
1051
1052 int unit_add_default_target_dependency(Unit *u, Unit *target) {
1053         assert(u);
1054         assert(target);
1055
1056         if (target->type != UNIT_TARGET)
1057                 return 0;
1058
1059         /* Only add the dependency if both units are loaded, so that
1060          * that loop check below is reliable */
1061         if (u->load_state != UNIT_LOADED ||
1062             target->load_state != UNIT_LOADED)
1063                 return 0;
1064
1065         /* If either side wants no automatic dependencies, then let's
1066          * skip this */
1067         if (!u->default_dependencies ||
1068             !target->default_dependencies)
1069                 return 0;
1070
1071         /* Don't create loops */
1072         if (set_get(target->dependencies[UNIT_BEFORE], u))
1073                 return 0;
1074
1075         return unit_add_dependency(target, UNIT_AFTER, u, true);
1076 }
1077
1078 static int unit_add_target_dependencies(Unit *u) {
1079
1080         static const UnitDependency deps[] = {
1081                 UNIT_REQUIRED_BY,
1082                 UNIT_REQUIRED_BY_OVERRIDABLE,
1083                 UNIT_WANTED_BY,
1084                 UNIT_BOUND_BY
1085         };
1086
1087         Unit *target;
1088         Iterator i;
1089         unsigned k;
1090         int r = 0;
1091
1092         assert(u);
1093
1094         for (k = 0; k < ELEMENTSOF(deps); k++)
1095                 SET_FOREACH(target, u->dependencies[deps[k]], i) {
1096                         r = unit_add_default_target_dependency(u, target);
1097                         if (r < 0)
1098                                 return r;
1099                 }
1100
1101         return r;
1102 }
1103
1104 static int unit_add_slice_dependencies(Unit *u) {
1105         assert(u);
1106
1107         if (!unit_get_cgroup_context(u))
1108                 return 0;
1109
1110         if (UNIT_ISSET(u->slice))
1111                 return unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, UNIT_DEREF(u->slice), true);
1112
1113         if (streq(u->id, SPECIAL_ROOT_SLICE))
1114                 return 0;
1115
1116         return unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, SPECIAL_ROOT_SLICE, NULL, true);
1117 }
1118
1119 static int unit_add_mount_dependencies(Unit *u) {
1120         char **i;
1121         int r;
1122
1123         assert(u);
1124
1125         STRV_FOREACH(i, u->requires_mounts_for) {
1126                 char prefix[strlen(*i) + 1];
1127
1128                 PATH_FOREACH_PREFIX_MORE(prefix, *i) {
1129                         Unit *m;
1130
1131                         r = manager_get_unit_by_path(u->manager, prefix, ".mount", &m);
1132                         if (r < 0)
1133                                 return r;
1134                         if (r == 0)
1135                                 continue;
1136                         if (m == u)
1137                                 continue;
1138
1139                         if (m->load_state != UNIT_LOADED)
1140                                 continue;
1141
1142                         r = unit_add_dependency(u, UNIT_AFTER, m, true);
1143                         if (r < 0)
1144                                 return r;
1145
1146                         if (m->fragment_path) {
1147                                 r = unit_add_dependency(u, UNIT_REQUIRES, m, true);
1148                                 if (r < 0)
1149                                         return r;
1150                         }
1151                 }
1152         }
1153
1154         return 0;
1155 }
1156
1157 static int unit_add_startup_units(Unit *u) {
1158         CGroupContext *c;
1159         int r = 0;
1160
1161         c = unit_get_cgroup_context(u);
1162         if (!c)
1163                 return 0;
1164
1165         if (c->startup_cpu_shares == (unsigned long) -1 &&
1166             c->startup_blockio_weight == (unsigned long) -1)
1167                 return 0;
1168
1169         r = set_put(u->manager->startup_units, u);
1170         if (r == -EEXIST)
1171                 return 0;
1172
1173         return r;
1174 }
1175
1176 int unit_load(Unit *u) {
1177         int r;
1178
1179         assert(u);
1180
1181         if (u->in_load_queue) {
1182                 LIST_REMOVE(load_queue, u->manager->load_queue, u);
1183                 u->in_load_queue = false;
1184         }
1185
1186         if (u->type == _UNIT_TYPE_INVALID)
1187                 return -EINVAL;
1188
1189         if (u->load_state != UNIT_STUB)
1190                 return 0;
1191
1192         if (UNIT_VTABLE(u)->load) {
1193                 r = UNIT_VTABLE(u)->load(u);
1194                 if (r < 0)
1195                         goto fail;
1196         }
1197
1198         if (u->load_state == UNIT_STUB) {
1199                 r = -ENOENT;
1200                 goto fail;
1201         }
1202
1203         if (u->load_state == UNIT_LOADED) {
1204
1205                 r = unit_add_target_dependencies(u);
1206                 if (r < 0)
1207                         goto fail;
1208
1209                 r = unit_add_slice_dependencies(u);
1210                 if (r < 0)
1211                         goto fail;
1212
1213                 r = unit_add_mount_dependencies(u);
1214                 if (r < 0)
1215                         goto fail;
1216
1217                 r = unit_add_startup_units(u);
1218                 if (r < 0)
1219                         goto fail;
1220
1221                 if (u->on_failure_job_mode == JOB_ISOLATE && set_size(u->dependencies[UNIT_ON_FAILURE]) > 1) {
1222                         log_unit_error(u->id, "More than one OnFailure= dependencies specified for %s but OnFailureJobMode=isolate set. Refusing.", u->id);
1223                         r = -EINVAL;
1224                         goto fail;
1225                 }
1226
1227                 unit_update_cgroup_members_masks(u);
1228         }
1229
1230         assert((u->load_state != UNIT_MERGED) == !u->merged_into);
1231
1232         unit_add_to_dbus_queue(unit_follow_merge(u));
1233         unit_add_to_gc_queue(u);
1234
1235         return 0;
1236
1237 fail:
1238         u->load_state = u->load_state == UNIT_STUB ? UNIT_NOT_FOUND : UNIT_ERROR;
1239         u->load_error = r;
1240         unit_add_to_dbus_queue(u);
1241         unit_add_to_gc_queue(u);
1242
1243         log_unit_debug(u->id, "Failed to load configuration for %s: %s",
1244                        u->id, strerror(-r));
1245
1246         return r;
1247 }
1248
1249 static bool unit_condition_test_list(Unit *u, Condition *first, const char *(*to_string)(ConditionType t)) {
1250         Condition *c;
1251         int triggered = -1;
1252
1253         assert(u);
1254         assert(to_string);
1255
1256         /* If the condition list is empty, then it is true */
1257         if (!first)
1258                 return true;
1259
1260         /* Otherwise, if all of the non-trigger conditions apply and
1261          * if any of the trigger conditions apply (unless there are
1262          * none) we return true */
1263         LIST_FOREACH(conditions, c, first) {
1264                 int r;
1265
1266                 r = condition_test(c);
1267                 if (r < 0)
1268                         log_unit_warning(u->id,
1269                                          "Couldn't determine result for %s=%s%s%s for %s, assuming failed: %s",
1270                                          to_string(c->type),
1271                                          c->trigger ? "|" : "",
1272                                          c->negate ? "!" : "",
1273                                          c->parameter,
1274                                          u->id,
1275                                          strerror(-r));
1276                 else
1277                         log_unit_debug(u->id,
1278                                        "%s=%s%s%s %s for %s.",
1279                                        to_string(c->type),
1280                                        c->trigger ? "|" : "",
1281                                        c->negate ? "!" : "",
1282                                        c->parameter,
1283                                        condition_result_to_string(c->result),
1284                                        u->id);
1285
1286                 if (!c->trigger && r <= 0)
1287                         return false;
1288
1289                 if (c->trigger && triggered <= 0)
1290                         triggered = r > 0;
1291         }
1292
1293         return triggered != 0;
1294 }
1295
1296 static bool unit_condition_test(Unit *u) {
1297         assert(u);
1298
1299         dual_timestamp_get(&u->condition_timestamp);
1300         u->condition_result = unit_condition_test_list(u, u->conditions, condition_type_to_string);
1301
1302         return u->condition_result;
1303 }
1304
1305 static bool unit_assert_test(Unit *u) {
1306         assert(u);
1307
1308         dual_timestamp_get(&u->assert_timestamp);
1309         u->assert_result = unit_condition_test_list(u, u->asserts, assert_type_to_string);
1310
1311         return u->assert_result;
1312 }
1313
1314 _pure_ static const char* unit_get_status_message_format(Unit *u, JobType t) {
1315         const UnitStatusMessageFormats *format_table;
1316
1317         assert(u);
1318         assert(t >= 0);
1319         assert(t < _JOB_TYPE_MAX);
1320
1321         if (t != JOB_START && t != JOB_STOP)
1322                 return NULL;
1323
1324         format_table = &UNIT_VTABLE(u)->status_message_formats;
1325         if (!format_table)
1326                 return NULL;
1327
1328         return format_table->starting_stopping[t == JOB_STOP];
1329 }
1330
1331 _pure_ static const char *unit_get_status_message_format_try_harder(Unit *u, JobType t) {
1332         const char *format;
1333
1334         assert(u);
1335         assert(t >= 0);
1336         assert(t < _JOB_TYPE_MAX);
1337
1338         format = unit_get_status_message_format(u, t);
1339         if (format)
1340                 return format;
1341
1342         /* Return generic strings */
1343         if (t == JOB_START)
1344                 return "Starting %s.";
1345         else if (t == JOB_STOP)
1346                 return "Stopping %s.";
1347         else if (t == JOB_RELOAD)
1348                 return "Reloading %s.";
1349
1350         return NULL;
1351 }
1352
1353 static void unit_status_print_starting_stopping(Unit *u, JobType t) {
1354         const char *format;
1355
1356         assert(u);
1357
1358         /* We only print status messages for selected units on
1359          * selected operations. */
1360
1361         format = unit_get_status_message_format(u, t);
1362         if (!format)
1363                 return;
1364
1365         DISABLE_WARNING_FORMAT_NONLITERAL;
1366         unit_status_printf(u, "", format);
1367         REENABLE_WARNING;
1368 }
1369
1370 static void unit_status_log_starting_stopping_reloading(Unit *u, JobType t) {
1371         const char *format;
1372         char buf[LINE_MAX];
1373         sd_id128_t mid;
1374
1375         assert(u);
1376
1377         if (t != JOB_START && t != JOB_STOP && t != JOB_RELOAD)
1378                 return;
1379
1380         if (log_on_console())
1381                 return;
1382
1383         /* We log status messages for all units and all operations. */
1384
1385         format = unit_get_status_message_format_try_harder(u, t);
1386         if (!format)
1387                 return;
1388
1389         DISABLE_WARNING_FORMAT_NONLITERAL;
1390         snprintf(buf, sizeof(buf), format, unit_description(u));
1391         char_array_0(buf);
1392         REENABLE_WARNING;
1393
1394         mid = t == JOB_START ? SD_MESSAGE_UNIT_STARTING :
1395               t == JOB_STOP  ? SD_MESSAGE_UNIT_STOPPING :
1396                                SD_MESSAGE_UNIT_RELOADING;
1397
1398         log_unit_struct(u->id,
1399                         LOG_INFO,
1400                         LOG_MESSAGE_ID(mid),
1401                         LOG_MESSAGE("%s", buf),
1402                         NULL);
1403 }
1404
1405 /* Errors:
1406  *         -EBADR:     This unit type does not support starting.
1407  *         -EALREADY:  Unit is already started.
1408  *         -EAGAIN:    An operation is already in progress. Retry later.
1409  *         -ECANCELED: Too many requests for now.
1410  *         -EPROTO:    Assert failed
1411  */
1412 int unit_start(Unit *u) {
1413         UnitActiveState state;
1414         Unit *following;
1415
1416         assert(u);
1417
1418         if (u->load_state != UNIT_LOADED)
1419                 return -EINVAL;
1420
1421         /* If this is already started, then this will succeed. Note
1422          * that this will even succeed if this unit is not startable
1423          * by the user. This is relied on to detect when we need to
1424          * wait for units and when waiting is finished. */
1425         state = unit_active_state(u);
1426         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
1427                 return -EALREADY;
1428
1429         /* If the conditions failed, don't do anything at all. If we
1430          * already are activating this call might still be useful to
1431          * speed up activation in case there is some hold-off time,
1432          * but we don't want to recheck the condition in that case. */
1433         if (state != UNIT_ACTIVATING &&
1434             !unit_condition_test(u)) {
1435                 log_unit_debug(u->id, "Starting of %s requested but condition failed. Not starting unit.", u->id);
1436                 return -EALREADY;
1437         }
1438
1439         /* If the asserts failed, fail the entire job */
1440         if (state != UNIT_ACTIVATING &&
1441             !unit_assert_test(u)) {
1442                 log_unit_debug(u->id, "Starting of %s requested but asserts failed.", u->id);
1443                 return -EPROTO;
1444         }
1445
1446         /* Forward to the main object, if we aren't it. */
1447         following = unit_following(u);
1448         if (following) {
1449                 log_unit_debug(u->id, "Redirecting start request from %s to %s.", u->id, following->id);
1450                 return unit_start(following);
1451         }
1452
1453         unit_status_log_starting_stopping_reloading(u, JOB_START);
1454         unit_status_print_starting_stopping(u, JOB_START);
1455
1456         /* If it is stopped, but we cannot start it, then fail */
1457         if (!UNIT_VTABLE(u)->start)
1458                 return -EBADR;
1459
1460         /* We don't suppress calls to ->start() here when we are
1461          * already starting, to allow this request to be used as a
1462          * "hurry up" call, for example when the unit is in some "auto
1463          * restart" state where it waits for a holdoff timer to elapse
1464          * before it will start again. */
1465
1466         unit_add_to_dbus_queue(u);
1467
1468         return UNIT_VTABLE(u)->start(u);
1469 }
1470
1471 bool unit_can_start(Unit *u) {
1472         assert(u);
1473
1474         return !!UNIT_VTABLE(u)->start;
1475 }
1476
1477 bool unit_can_isolate(Unit *u) {
1478         assert(u);
1479
1480         return unit_can_start(u) &&
1481                 u->allow_isolate;
1482 }
1483
1484 /* Errors:
1485  *         -EBADR:    This unit type does not support stopping.
1486  *         -EALREADY: Unit is already stopped.
1487  *         -EAGAIN:   An operation is already in progress. Retry later.
1488  */
1489 int unit_stop(Unit *u) {
1490         UnitActiveState state;
1491         Unit *following;
1492
1493         assert(u);
1494
1495         state = unit_active_state(u);
1496         if (UNIT_IS_INACTIVE_OR_FAILED(state))
1497                 return -EALREADY;
1498
1499         if ((following = unit_following(u))) {
1500                 log_unit_debug(u->id, "Redirecting stop request from %s to %s.",
1501                                u->id, following->id);
1502                 return unit_stop(following);
1503         }
1504
1505         unit_status_log_starting_stopping_reloading(u, JOB_STOP);
1506         unit_status_print_starting_stopping(u, JOB_STOP);
1507
1508         if (!UNIT_VTABLE(u)->stop)
1509                 return -EBADR;
1510
1511         unit_add_to_dbus_queue(u);
1512
1513         return UNIT_VTABLE(u)->stop(u);
1514 }
1515
1516 /* Errors:
1517  *         -EBADR:    This unit type does not support reloading.
1518  *         -ENOEXEC:  Unit is not started.
1519  *         -EAGAIN:   An operation is already in progress. Retry later.
1520  */
1521 int unit_reload(Unit *u) {
1522         UnitActiveState state;
1523         Unit *following;
1524
1525         assert(u);
1526
1527         if (u->load_state != UNIT_LOADED)
1528                 return -EINVAL;
1529
1530         if (!unit_can_reload(u))
1531                 return -EBADR;
1532
1533         state = unit_active_state(u);
1534         if (state == UNIT_RELOADING)
1535                 return -EALREADY;
1536
1537         if (state != UNIT_ACTIVE) {
1538                 log_unit_warning(u->id, "Unit %s cannot be reloaded because it is inactive.",
1539                                  u->id);
1540                 return -ENOEXEC;
1541         }
1542
1543         following = unit_following(u);
1544         if (following) {
1545                 log_unit_debug(u->id, "Redirecting reload request from %s to %s.",
1546                                u->id, following->id);
1547                 return unit_reload(following);
1548         }
1549
1550         unit_status_log_starting_stopping_reloading(u, JOB_RELOAD);
1551
1552         unit_add_to_dbus_queue(u);
1553         return UNIT_VTABLE(u)->reload(u);
1554 }
1555
1556 bool unit_can_reload(Unit *u) {
1557         assert(u);
1558
1559         if (!UNIT_VTABLE(u)->reload)
1560                 return false;
1561
1562         if (!UNIT_VTABLE(u)->can_reload)
1563                 return true;
1564
1565         return UNIT_VTABLE(u)->can_reload(u);
1566 }
1567
1568 static void unit_check_unneeded(Unit *u) {
1569         Iterator i;
1570         Unit *other;
1571
1572         assert(u);
1573
1574         /* If this service shall be shut down when unneeded then do
1575          * so. */
1576
1577         if (!u->stop_when_unneeded)
1578                 return;
1579
1580         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1581                 return;
1582
1583         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
1584                 if (unit_active_or_pending(other))
1585                         return;
1586
1587         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1588                 if (unit_active_or_pending(other))
1589                         return;
1590
1591         SET_FOREACH(other, u->dependencies[UNIT_WANTED_BY], i)
1592                 if (unit_active_or_pending(other))
1593                         return;
1594
1595         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1596                 if (unit_active_or_pending(other))
1597                         return;
1598
1599         log_unit_info(u->id, "Unit %s is not needed anymore. Stopping.", u->id);
1600
1601         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1602         manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1603 }
1604
1605 static void unit_check_binds_to(Unit *u) {
1606         bool stop = false;
1607         Unit *other;
1608         Iterator i;
1609
1610         assert(u);
1611
1612         if (u->job)
1613                 return;
1614
1615         if (unit_active_state(u) != UNIT_ACTIVE)
1616                 return;
1617
1618         SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i) {
1619                 if (other->job)
1620                         continue;
1621
1622                 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
1623                         continue;
1624
1625                 stop = true;
1626         }
1627
1628         if (!stop)
1629                 return;
1630
1631         log_unit_info(u->id, "Unit %s is bound to inactive service. Stopping, too.", u->id);
1632
1633         /* A unit we need to run is gone. Sniff. Let's stop this. */
1634         manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1635 }
1636
1637 static void retroactively_start_dependencies(Unit *u) {
1638         Iterator i;
1639         Unit *other;
1640
1641         assert(u);
1642         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1643
1644         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1645                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1646                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1647                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1648
1649         SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)
1650                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1651                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1652                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1653
1654         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1655                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1656                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1657                         manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1658
1659         SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1660                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1661                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1662                         manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1663
1664         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTS], i)
1665                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1666                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1667
1668         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
1669                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1670                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1671 }
1672
1673 static void retroactively_stop_dependencies(Unit *u) {
1674         Iterator i;
1675         Unit *other;
1676
1677         assert(u);
1678         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1679
1680         /* Pull down units which are bound to us recursively if enabled */
1681         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1682                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1683                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1684 }
1685
1686 static void check_unneeded_dependencies(Unit *u) {
1687         Iterator i;
1688         Unit *other;
1689
1690         assert(u);
1691         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1692
1693         /* Garbage collect services that might not be needed anymore, if enabled */
1694         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1695                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1696                         unit_check_unneeded(other);
1697         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1698                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1699                         unit_check_unneeded(other);
1700         SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1701                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1702                         unit_check_unneeded(other);
1703         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i)
1704                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1705                         unit_check_unneeded(other);
1706         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1707                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1708                         unit_check_unneeded(other);
1709         SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)
1710                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1711                         unit_check_unneeded(other);
1712 }
1713
1714 void unit_start_on_failure(Unit *u) {
1715         Unit *other;
1716         Iterator i;
1717
1718         assert(u);
1719
1720         if (set_size(u->dependencies[UNIT_ON_FAILURE]) <= 0)
1721                 return;
1722
1723         log_unit_info(u->id, "Triggering OnFailure= dependencies of %s.", u->id);
1724
1725         SET_FOREACH(other, u->dependencies[UNIT_ON_FAILURE], i) {
1726                 int r;
1727
1728                 r = manager_add_job(u->manager, JOB_START, other, u->on_failure_job_mode, true, NULL, NULL);
1729                 if (r < 0)
1730                         log_unit_error_errno(u->id, r, "Failed to enqueue OnFailure= job: %m");
1731         }
1732 }
1733
1734 void unit_trigger_notify(Unit *u) {
1735         Unit *other;
1736         Iterator i;
1737
1738         assert(u);
1739
1740         SET_FOREACH(other, u->dependencies[UNIT_TRIGGERED_BY], i)
1741                 if (UNIT_VTABLE(other)->trigger_notify)
1742                         UNIT_VTABLE(other)->trigger_notify(other, u);
1743 }
1744
1745 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1746         Manager *m;
1747         bool unexpected;
1748
1749         assert(u);
1750         assert(os < _UNIT_ACTIVE_STATE_MAX);
1751         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1752
1753         /* Note that this is called for all low-level state changes,
1754          * even if they might map to the same high-level
1755          * UnitActiveState! That means that ns == os is an expected
1756          * behavior here. For example: if a mount point is remounted
1757          * this function will be called too! */
1758
1759         m = u->manager;
1760
1761         /* Update timestamps for state changes */
1762         if (m->n_reloading <= 0) {
1763                 dual_timestamp ts;
1764
1765                 dual_timestamp_get(&ts);
1766
1767                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1768                         u->inactive_exit_timestamp = ts;
1769                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1770                         u->inactive_enter_timestamp = ts;
1771
1772                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1773                         u->active_enter_timestamp = ts;
1774                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1775                         u->active_exit_timestamp = ts;
1776         }
1777
1778         /* Keep track of failed units */
1779         if (ns == UNIT_FAILED)
1780                 set_put(u->manager->failed_units, u);
1781         else
1782                 set_remove(u->manager->failed_units, u);
1783
1784         /* Make sure the cgroup is always removed when we become inactive */
1785         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1786                 unit_destroy_cgroup_if_empty(u);
1787
1788         /* Note that this doesn't apply to RemainAfterExit services exiting
1789          * successfully, since there's no change of state in that case. Which is
1790          * why it is handled in service_set_state() */
1791         if (UNIT_IS_INACTIVE_OR_FAILED(os) != UNIT_IS_INACTIVE_OR_FAILED(ns)) {
1792                 ExecContext *ec;
1793
1794                 ec = unit_get_exec_context(u);
1795                 if (ec && exec_context_may_touch_console(ec)) {
1796                         if (UNIT_IS_INACTIVE_OR_FAILED(ns)) {
1797                                 m->n_on_console --;
1798
1799                                 if (m->n_on_console == 0)
1800                                         /* unset no_console_output flag, since the console is free */
1801                                         m->no_console_output = false;
1802                         } else
1803                                 m->n_on_console ++;
1804                 }
1805         }
1806
1807         if (u->job) {
1808                 unexpected = false;
1809
1810                 if (u->job->state == JOB_WAITING)
1811
1812                         /* So we reached a different state for this
1813                          * job. Let's see if we can run it now if it
1814                          * failed previously due to EAGAIN. */
1815                         job_add_to_run_queue(u->job);
1816
1817                 /* Let's check whether this state change constitutes a
1818                  * finished job, or maybe contradicts a running job and
1819                  * hence needs to invalidate jobs. */
1820
1821                 switch (u->job->type) {
1822
1823                 case JOB_START:
1824                 case JOB_VERIFY_ACTIVE:
1825
1826                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1827                                 job_finish_and_invalidate(u->job, JOB_DONE, true);
1828                         else if (u->job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1829                                 unexpected = true;
1830
1831                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1832                                         job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);
1833                         }
1834
1835                         break;
1836
1837                 case JOB_RELOAD:
1838                 case JOB_RELOAD_OR_START:
1839
1840                         if (u->job->state == JOB_RUNNING) {
1841                                 if (ns == UNIT_ACTIVE)
1842                                         job_finish_and_invalidate(u->job, reload_success ? JOB_DONE : JOB_FAILED, true);
1843                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1844                                         unexpected = true;
1845
1846                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1847                                                 job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);
1848                                 }
1849                         }
1850
1851                         break;
1852
1853                 case JOB_STOP:
1854                 case JOB_RESTART:
1855                 case JOB_TRY_RESTART:
1856
1857                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1858                                 job_finish_and_invalidate(u->job, JOB_DONE, true);
1859                         else if (u->job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1860                                 unexpected = true;
1861                                 job_finish_and_invalidate(u->job, JOB_FAILED, true);
1862                         }
1863
1864                         break;
1865
1866                 default:
1867                         assert_not_reached("Job type unknown");
1868                 }
1869
1870         } else
1871                 unexpected = true;
1872
1873         if (m->n_reloading <= 0) {
1874
1875                 /* If this state change happened without being
1876                  * requested by a job, then let's retroactively start
1877                  * or stop dependencies. We skip that step when
1878                  * deserializing, since we don't want to create any
1879                  * additional jobs just because something is already
1880                  * activated. */
1881
1882                 if (unexpected) {
1883                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1884                                 retroactively_start_dependencies(u);
1885                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1886                                 retroactively_stop_dependencies(u);
1887                 }
1888
1889                 /* stop unneeded units regardless if going down was expected or not */
1890                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1891                         check_unneeded_dependencies(u);
1892
1893                 if (ns != os && ns == UNIT_FAILED) {
1894                         log_unit_notice(u->id, "Unit %s entered failed state.", u->id);
1895                         unit_start_on_failure(u);
1896                 }
1897         }
1898
1899         /* Some names are special */
1900         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1901
1902                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1903                         /* The bus might have just become available,
1904                          * hence try to connect to it, if we aren't
1905                          * yet connected. */
1906                         bus_init(m, true);
1907
1908                 if (u->type == UNIT_SERVICE &&
1909                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1910                     m->n_reloading <= 0) {
1911                         /* Write audit record if we have just finished starting up */
1912                         manager_send_unit_audit(m, u, AUDIT_SERVICE_START, true);
1913                         u->in_audit = true;
1914                 }
1915
1916                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1917                         manager_send_unit_plymouth(m, u);
1918
1919         } else {
1920
1921                 /* We don't care about D-Bus here, since we'll get an
1922                  * asynchronous notification for it anyway. */
1923
1924                 if (u->type == UNIT_SERVICE &&
1925                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1926                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1927                     m->n_reloading <= 0) {
1928
1929                         /* Hmm, if there was no start record written
1930                          * write it now, so that we always have a nice
1931                          * pair */
1932                         if (!u->in_audit) {
1933                                 manager_send_unit_audit(m, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1934
1935                                 if (ns == UNIT_INACTIVE)
1936                                         manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, true);
1937                         } else
1938                                 /* Write audit record if we have just finished shutting down */
1939                                 manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1940
1941                         u->in_audit = false;
1942                 }
1943         }
1944
1945         manager_recheck_journal(m);
1946         unit_trigger_notify(u);
1947
1948         if (u->manager->n_reloading <= 0) {
1949                 /* Maybe we finished startup and are now ready for
1950                  * being stopped because unneeded? */
1951                 unit_check_unneeded(u);
1952
1953                 /* Maybe we finished startup, but something we needed
1954                  * has vanished? Let's die then. (This happens when
1955                  * something BindsTo= to a Type=oneshot unit, as these
1956                  * units go directly from starting to inactive,
1957                  * without ever entering started.) */
1958                 unit_check_binds_to(u);
1959         }
1960
1961         unit_add_to_dbus_queue(u);
1962         unit_add_to_gc_queue(u);
1963 }
1964
1965 int unit_watch_pid(Unit *u, pid_t pid) {
1966         int q, r;
1967
1968         assert(u);
1969         assert(pid >= 1);
1970
1971         /* Watch a specific PID. We only support one or two units
1972          * watching each PID for now, not more. */
1973
1974         r = set_ensure_allocated(&u->pids, NULL);
1975         if (r < 0)
1976                 return r;
1977
1978         r = hashmap_ensure_allocated(&u->manager->watch_pids1, NULL);
1979         if (r < 0)
1980                 return r;
1981
1982         r = hashmap_put(u->manager->watch_pids1, LONG_TO_PTR(pid), u);
1983         if (r == -EEXIST) {
1984                 r = hashmap_ensure_allocated(&u->manager->watch_pids2, NULL);
1985                 if (r < 0)
1986                         return r;
1987
1988                 r = hashmap_put(u->manager->watch_pids2, LONG_TO_PTR(pid), u);
1989         }
1990
1991         q = set_put(u->pids, LONG_TO_PTR(pid));
1992         if (q < 0)
1993                 return q;
1994
1995         return r;
1996 }
1997
1998 void unit_unwatch_pid(Unit *u, pid_t pid) {
1999         assert(u);
2000         assert(pid >= 1);
2001
2002         hashmap_remove_value(u->manager->watch_pids1, LONG_TO_PTR(pid), u);
2003         hashmap_remove_value(u->manager->watch_pids2, LONG_TO_PTR(pid), u);
2004         set_remove(u->pids, LONG_TO_PTR(pid));
2005 }
2006
2007 void unit_unwatch_all_pids(Unit *u) {
2008         assert(u);
2009
2010         while (!set_isempty(u->pids))
2011                 unit_unwatch_pid(u, PTR_TO_LONG(set_first(u->pids)));
2012
2013         set_free(u->pids);
2014         u->pids = NULL;
2015 }
2016
2017 static int unit_watch_pids_in_path(Unit *u, const char *path) {
2018         _cleanup_closedir_ DIR *d = NULL;
2019         _cleanup_fclose_ FILE *f = NULL;
2020         int ret = 0, r;
2021
2022         assert(u);
2023         assert(path);
2024
2025         /* Adds all PIDs from a specific cgroup path to the set of PIDs we watch. */
2026
2027         r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
2028         if (r >= 0) {
2029                 pid_t pid;
2030
2031                 while ((r = cg_read_pid(f, &pid)) > 0) {
2032                         r = unit_watch_pid(u, pid);
2033                         if (r < 0 && ret >= 0)
2034                                 ret = r;
2035                 }
2036                 if (r < 0 && ret >= 0)
2037                         ret = r;
2038
2039         } else if (ret >= 0)
2040                 ret = r;
2041
2042         r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
2043         if (r >= 0) {
2044                 char *fn;
2045
2046                 while ((r = cg_read_subgroup(d, &fn)) > 0) {
2047                         _cleanup_free_ char *p = NULL;
2048
2049                         p = strjoin(path, "/", fn, NULL);
2050                         free(fn);
2051
2052                         if (!p)
2053                                 return -ENOMEM;
2054
2055                         r = unit_watch_pids_in_path(u, p);
2056                         if (r < 0 && ret >= 0)
2057                                 ret = r;
2058                 }
2059                 if (r < 0 && ret >= 0)
2060                         ret = r;
2061
2062         } else if (ret >= 0)
2063                 ret = r;
2064
2065         return ret;
2066 }
2067
2068 int unit_watch_all_pids(Unit *u) {
2069         assert(u);
2070
2071         /* Adds all PIDs from our cgroup to the set of PIDs we watch */
2072
2073         if (!u->cgroup_path)
2074                 return -ENOENT;
2075
2076         return unit_watch_pids_in_path(u, u->cgroup_path);
2077 }
2078
2079 void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2) {
2080         Iterator i;
2081         void *e;
2082
2083         assert(u);
2084
2085         /* Cleans dead PIDs from our list */
2086
2087         SET_FOREACH(e, u->pids, i) {
2088                 pid_t pid = PTR_TO_LONG(e);
2089
2090                 if (pid == except1 || pid == except2)
2091                         continue;
2092
2093                 if (!pid_is_unwaited(pid))
2094                         unit_unwatch_pid(u, pid);
2095         }
2096 }
2097
2098 bool unit_job_is_applicable(Unit *u, JobType j) {
2099         assert(u);
2100         assert(j >= 0 && j < _JOB_TYPE_MAX);
2101
2102         switch (j) {
2103
2104         case JOB_VERIFY_ACTIVE:
2105         case JOB_START:
2106         case JOB_STOP:
2107         case JOB_NOP:
2108                 return true;
2109
2110         case JOB_RESTART:
2111         case JOB_TRY_RESTART:
2112                 return unit_can_start(u);
2113
2114         case JOB_RELOAD:
2115                 return unit_can_reload(u);
2116
2117         case JOB_RELOAD_OR_START:
2118                 return unit_can_reload(u) && unit_can_start(u);
2119
2120         default:
2121                 assert_not_reached("Invalid job type");
2122         }
2123 }
2124
2125 static int maybe_warn_about_dependency(const char *id, const char *other, UnitDependency dependency) {
2126         assert(id);
2127
2128         switch (dependency) {
2129         case UNIT_REQUIRES:
2130         case UNIT_REQUIRES_OVERRIDABLE:
2131         case UNIT_WANTS:
2132         case UNIT_REQUISITE:
2133         case UNIT_REQUISITE_OVERRIDABLE:
2134         case UNIT_BINDS_TO:
2135         case UNIT_PART_OF:
2136         case UNIT_REQUIRED_BY:
2137         case UNIT_REQUIRED_BY_OVERRIDABLE:
2138         case UNIT_WANTED_BY:
2139         case UNIT_BOUND_BY:
2140         case UNIT_CONSISTS_OF:
2141         case UNIT_REFERENCES:
2142         case UNIT_REFERENCED_BY:
2143         case UNIT_PROPAGATES_RELOAD_TO:
2144         case UNIT_RELOAD_PROPAGATED_FROM:
2145         case UNIT_JOINS_NAMESPACE_OF:
2146                 return 0;
2147
2148         case UNIT_CONFLICTS:
2149         case UNIT_CONFLICTED_BY:
2150         case UNIT_BEFORE:
2151         case UNIT_AFTER:
2152         case UNIT_ON_FAILURE:
2153         case UNIT_TRIGGERS:
2154         case UNIT_TRIGGERED_BY:
2155                 if (streq_ptr(id, other))
2156                         log_unit_warning(id, "Dependency %s=%s dropped from unit %s",
2157                                          unit_dependency_to_string(dependency), id, other);
2158                 else
2159                         log_unit_warning(id, "Dependency %s=%s dropped from unit %s merged into %s",
2160                                          unit_dependency_to_string(dependency), id,
2161                                          strna(other), id);
2162                 return -EINVAL;
2163
2164         case _UNIT_DEPENDENCY_MAX:
2165         case _UNIT_DEPENDENCY_INVALID:
2166                 break;
2167         }
2168
2169         assert_not_reached("Invalid dependency type");
2170 }
2171
2172 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
2173
2174         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
2175                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
2176                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
2177                 [UNIT_WANTS] = UNIT_WANTED_BY,
2178                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
2179                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
2180                 [UNIT_BINDS_TO] = UNIT_BOUND_BY,
2181                 [UNIT_PART_OF] = UNIT_CONSISTS_OF,
2182                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
2183                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
2184                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
2185                 [UNIT_BOUND_BY] = UNIT_BINDS_TO,
2186                 [UNIT_CONSISTS_OF] = UNIT_PART_OF,
2187                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
2188                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
2189                 [UNIT_BEFORE] = UNIT_AFTER,
2190                 [UNIT_AFTER] = UNIT_BEFORE,
2191                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
2192                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
2193                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES,
2194                 [UNIT_TRIGGERS] = UNIT_TRIGGERED_BY,
2195                 [UNIT_TRIGGERED_BY] = UNIT_TRIGGERS,
2196                 [UNIT_PROPAGATES_RELOAD_TO] = UNIT_RELOAD_PROPAGATED_FROM,
2197                 [UNIT_RELOAD_PROPAGATED_FROM] = UNIT_PROPAGATES_RELOAD_TO,
2198                 [UNIT_JOINS_NAMESPACE_OF] = UNIT_JOINS_NAMESPACE_OF,
2199         };
2200         int r, q = 0, v = 0, w = 0;
2201         Unit *orig_u = u, *orig_other = other;
2202
2203         assert(u);
2204         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
2205         assert(other);
2206
2207         u = unit_follow_merge(u);
2208         other = unit_follow_merge(other);
2209
2210         /* We won't allow dependencies on ourselves. We will not
2211          * consider them an error however. */
2212         if (u == other) {
2213                 maybe_warn_about_dependency(orig_u->id, orig_other->id, d);
2214                 return 0;
2215         }
2216
2217         r = set_ensure_allocated(&u->dependencies[d], NULL);
2218         if (r < 0)
2219                 return r;
2220
2221         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID) {
2222                 r = set_ensure_allocated(&other->dependencies[inverse_table[d]], NULL);
2223                 if (r < 0)
2224                         return r;
2225         }
2226
2227         if (add_reference) {
2228                 r = set_ensure_allocated(&u->dependencies[UNIT_REFERENCES], NULL);
2229                 if (r < 0)
2230                         return r;
2231
2232                 r = set_ensure_allocated(&other->dependencies[UNIT_REFERENCED_BY], NULL);
2233                 if (r < 0)
2234                         return r;
2235         }
2236
2237         q = set_put(u->dependencies[d], other);
2238         if (q < 0)
2239                 return q;
2240
2241         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID && inverse_table[d] != d) {
2242                 v = set_put(other->dependencies[inverse_table[d]], u);
2243                 if (v < 0) {
2244                         r = v;
2245                         goto fail;
2246                 }
2247         }
2248
2249         if (add_reference) {
2250                 w = set_put(u->dependencies[UNIT_REFERENCES], other);
2251                 if (w < 0) {
2252                         r = w;
2253                         goto fail;
2254                 }
2255
2256                 r = set_put(other->dependencies[UNIT_REFERENCED_BY], u);
2257                 if (r < 0)
2258                         goto fail;
2259         }
2260
2261         unit_add_to_dbus_queue(u);
2262         return 0;
2263
2264 fail:
2265         if (q > 0)
2266                 set_remove(u->dependencies[d], other);
2267
2268         if (v > 0)
2269                 set_remove(other->dependencies[inverse_table[d]], u);
2270
2271         if (w > 0)
2272                 set_remove(u->dependencies[UNIT_REFERENCES], other);
2273
2274         return r;
2275 }
2276
2277 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
2278         int r;
2279
2280         assert(u);
2281
2282         r = unit_add_dependency(u, d, other, add_reference);
2283         if (r < 0)
2284                 return r;
2285
2286         r = unit_add_dependency(u, e, other, add_reference);
2287         if (r < 0)
2288                 return r;
2289
2290         return 0;
2291 }
2292
2293 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
2294         char *s;
2295
2296         assert(u);
2297         assert(name || path);
2298         assert(p);
2299
2300         if (!name)
2301                 name = basename(path);
2302
2303         if (!unit_name_is_template(name)) {
2304                 *p = NULL;
2305                 return name;
2306         }
2307
2308         if (u->instance)
2309                 s = unit_name_replace_instance(name, u->instance);
2310         else {
2311                 _cleanup_free_ char *i = NULL;
2312
2313                 i = unit_name_to_prefix(u->id);
2314                 if (!i)
2315                         return NULL;
2316
2317                 s = unit_name_replace_instance(name, i);
2318         }
2319
2320         if (!s)
2321                 return NULL;
2322
2323         *p = s;
2324         return s;
2325 }
2326
2327 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
2328         Unit *other;
2329         int r;
2330         _cleanup_free_ char *s = NULL;
2331
2332         assert(u);
2333         assert(name || path);
2334
2335         name = resolve_template(u, name, path, &s);
2336         if (!name)
2337                 return -ENOMEM;
2338
2339         r = manager_load_unit(u->manager, name, path, NULL, &other);
2340         if (r < 0)
2341                 return r;
2342
2343         return unit_add_dependency(u, d, other, add_reference);
2344 }
2345
2346 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
2347         _cleanup_free_ char *s = NULL;
2348         Unit *other;
2349         int r;
2350
2351         assert(u);
2352         assert(name || path);
2353
2354         name = resolve_template(u, name, path, &s);
2355         if (!name)
2356                 return -ENOMEM;
2357
2358         r = manager_load_unit(u->manager, name, path, NULL, &other);
2359         if (r < 0)
2360                 return r;
2361
2362         return unit_add_two_dependencies(u, d, e, other, add_reference);
2363 }
2364
2365 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
2366         Unit *other;
2367         int r;
2368         _cleanup_free_ char *s = NULL;
2369
2370         assert(u);
2371         assert(name || path);
2372
2373         name = resolve_template(u, name, path, &s);
2374         if (!name)
2375                 return -ENOMEM;
2376
2377         r = manager_load_unit(u->manager, name, path, NULL, &other);
2378         if (r < 0)
2379                 return r;
2380
2381         return unit_add_dependency(other, d, u, add_reference);
2382 }
2383
2384 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
2385         Unit *other;
2386         int r;
2387         _cleanup_free_ char *s = NULL;
2388
2389         assert(u);
2390         assert(name || path);
2391
2392         name = resolve_template(u, name, path, &s);
2393         if (!name)
2394                 return -ENOMEM;
2395
2396         r = manager_load_unit(u->manager, name, path, NULL, &other);
2397         if (r < 0)
2398                 return r;
2399
2400         r = unit_add_two_dependencies(other, d, e, u, add_reference);
2401         if (r < 0)
2402                 return r;
2403
2404         return r;
2405 }
2406
2407 int set_unit_path(const char *p) {
2408         /* This is mostly for debug purposes */
2409         if (setenv("SYSTEMD_UNIT_PATH", p, 0) < 0)
2410                 return -errno;
2411
2412         return 0;
2413 }
2414
2415 char *unit_dbus_path(Unit *u) {
2416         assert(u);
2417
2418         if (!u->id)
2419                 return NULL;
2420
2421         return unit_dbus_path_from_name(u->id);
2422 }
2423
2424 char *unit_default_cgroup_path(Unit *u) {
2425         _cleanup_free_ char *escaped = NULL, *slice = NULL;
2426         int r;
2427
2428         assert(u);
2429
2430         if (unit_has_name(u, SPECIAL_ROOT_SLICE))
2431                 return strdup(u->manager->cgroup_root);
2432
2433         if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
2434                 r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
2435                 if (r < 0)
2436                         return NULL;
2437         }
2438
2439         escaped = cg_escape(u->id);
2440         if (!escaped)
2441                 return NULL;
2442
2443         if (slice)
2444                 return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL);
2445         else
2446                 return strjoin(u->manager->cgroup_root, "/", escaped, NULL);
2447 }
2448
2449 int unit_add_default_slice(Unit *u, CGroupContext *c) {
2450         _cleanup_free_ char *b = NULL;
2451         const char *slice_name;
2452         Unit *slice;
2453         int r;
2454
2455         assert(u);
2456         assert(c);
2457
2458         if (UNIT_ISSET(u->slice))
2459                 return 0;
2460
2461         if (u->instance) {
2462                 _cleanup_free_ char *prefix = NULL, *escaped = NULL;
2463
2464                 /* Implicitly place all instantiated units in their
2465                  * own per-template slice */
2466
2467                 prefix = unit_name_to_prefix(u->id);
2468                 if (!prefix)
2469                         return -ENOMEM;
2470
2471                 /* The prefix is already escaped, but it might include
2472                  * "-" which has a special meaning for slice units,
2473                  * hence escape it here extra. */
2474                 escaped = strreplace(prefix, "-", "\\x2d");
2475                 if (!escaped)
2476                         return -ENOMEM;
2477
2478                 if (u->manager->running_as == SYSTEMD_SYSTEM)
2479                         b = strjoin("system-", escaped, ".slice", NULL);
2480                 else
2481                         b = strappend(escaped, ".slice");
2482                 if (!b)
2483                         return -ENOMEM;
2484
2485                 slice_name = b;
2486         } else
2487                 slice_name =
2488                         u->manager->running_as == SYSTEMD_SYSTEM
2489                         ? SPECIAL_SYSTEM_SLICE
2490                         : SPECIAL_ROOT_SLICE;
2491
2492         r = manager_load_unit(u->manager, slice_name, NULL, NULL, &slice);
2493         if (r < 0)
2494                 return r;
2495
2496         unit_ref_set(&u->slice, slice);
2497         return 0;
2498 }
2499
2500 const char *unit_slice_name(Unit *u) {
2501         assert(u);
2502
2503         if (!UNIT_ISSET(u->slice))
2504                 return NULL;
2505
2506         return UNIT_DEREF(u->slice)->id;
2507 }
2508
2509 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
2510         _cleanup_free_ char *t = NULL;
2511         int r;
2512
2513         assert(u);
2514         assert(type);
2515         assert(_found);
2516
2517         t = unit_name_change_suffix(u->id, type);
2518         if (!t)
2519                 return -ENOMEM;
2520
2521         assert(!unit_has_name(u, t));
2522
2523         r = manager_load_unit(u->manager, t, NULL, NULL, _found);
2524         assert(r < 0 || *_found != u);
2525         return r;
2526 }
2527
2528 int unit_watch_bus_name(Unit *u, const char *name) {
2529         assert(u);
2530         assert(name);
2531
2532         /* Watch a specific name on the bus. We only support one unit
2533          * watching each name for now. */
2534
2535         return hashmap_put(u->manager->watch_bus, name, u);
2536 }
2537
2538 void unit_unwatch_bus_name(Unit *u, const char *name) {
2539         assert(u);
2540         assert(name);
2541
2542         hashmap_remove_value(u->manager->watch_bus, name, u);
2543 }
2544
2545 bool unit_can_serialize(Unit *u) {
2546         assert(u);
2547
2548         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2549 }
2550
2551 int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs) {
2552         int r;
2553
2554         assert(u);
2555         assert(f);
2556         assert(fds);
2557
2558         if (unit_can_serialize(u)) {
2559                 ExecRuntime *rt;
2560
2561                 r = UNIT_VTABLE(u)->serialize(u, f, fds);
2562                 if (r < 0)
2563                         return r;
2564
2565                 rt = unit_get_exec_runtime(u);
2566                 if (rt) {
2567                         r = exec_runtime_serialize(rt, u, f, fds);
2568                         if (r < 0)
2569                                 return r;
2570                 }
2571         }
2572
2573         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->inactive_exit_timestamp);
2574         dual_timestamp_serialize(f, "active-enter-timestamp", &u->active_enter_timestamp);
2575         dual_timestamp_serialize(f, "active-exit-timestamp", &u->active_exit_timestamp);
2576         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->inactive_enter_timestamp);
2577         dual_timestamp_serialize(f, "condition-timestamp", &u->condition_timestamp);
2578         dual_timestamp_serialize(f, "assert-timestamp", &u->assert_timestamp);
2579
2580         if (dual_timestamp_is_set(&u->condition_timestamp))
2581                 unit_serialize_item(u, f, "condition-result", yes_no(u->condition_result));
2582
2583         if (dual_timestamp_is_set(&u->assert_timestamp))
2584                 unit_serialize_item(u, f, "assert-result", yes_no(u->assert_result));
2585
2586         unit_serialize_item(u, f, "transient", yes_no(u->transient));
2587
2588         if (u->cgroup_path)
2589                 unit_serialize_item(u, f, "cgroup", u->cgroup_path);
2590
2591         if (serialize_jobs) {
2592                 if (u->job) {
2593                         fprintf(f, "job\n");
2594                         job_serialize(u->job, f, fds);
2595                 }
2596
2597                 if (u->nop_job) {
2598                         fprintf(f, "job\n");
2599                         job_serialize(u->nop_job, f, fds);
2600                 }
2601         }
2602
2603         /* End marker */
2604         fputc('\n', f);
2605         return 0;
2606 }
2607
2608 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2609         va_list ap;
2610
2611         assert(u);
2612         assert(f);
2613         assert(key);
2614         assert(format);
2615
2616         fputs(key, f);
2617         fputc('=', f);
2618
2619         va_start(ap, format);
2620         vfprintf(f, format, ap);
2621         va_end(ap);
2622
2623         fputc('\n', f);
2624 }
2625
2626 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2627         assert(u);
2628         assert(f);
2629         assert(key);
2630         assert(value);
2631
2632         fprintf(f, "%s=%s\n", key, value);
2633 }
2634
2635 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2636         ExecRuntime **rt = NULL;
2637         size_t offset;
2638         int r;
2639
2640         assert(u);
2641         assert(f);
2642         assert(fds);
2643
2644         offset = UNIT_VTABLE(u)->exec_runtime_offset;
2645         if (offset > 0)
2646                 rt = (ExecRuntime**) ((uint8_t*) u + offset);
2647
2648         for (;;) {
2649                 char line[LINE_MAX], *l, *v;
2650                 size_t k;
2651
2652                 if (!fgets(line, sizeof(line), f)) {
2653                         if (feof(f))
2654                                 return 0;
2655                         return -errno;
2656                 }
2657
2658                 char_array_0(line);
2659                 l = strstrip(line);
2660
2661                 /* End marker */
2662                 if (l[0] == 0)
2663                         return 0;
2664
2665                 k = strcspn(l, "=");
2666
2667                 if (l[k] == '=') {
2668                         l[k] = 0;
2669                         v = l+k+1;
2670                 } else
2671                         v = l+k;
2672
2673                 if (streq(l, "job")) {
2674                         if (v[0] == '\0') {
2675                                 /* new-style serialized job */
2676                                 Job *j = job_new_raw(u);
2677                                 if (!j)
2678                                         return -ENOMEM;
2679
2680                                 r = job_deserialize(j, f, fds);
2681                                 if (r < 0) {
2682                                         job_free(j);
2683                                         return r;
2684                                 }
2685
2686                                 r = hashmap_put(u->manager->jobs, UINT32_TO_PTR(j->id), j);
2687                                 if (r < 0) {
2688                                         job_free(j);
2689                                         return r;
2690                                 }
2691
2692                                 r = job_install_deserialized(j);
2693                                 if (r < 0) {
2694                                         hashmap_remove(u->manager->jobs, UINT32_TO_PTR(j->id));
2695                                         job_free(j);
2696                                         return r;
2697                                 }
2698
2699                                 if (j->state == JOB_RUNNING)
2700                                         u->manager->n_running_jobs++;
2701                         } else {
2702                                 /* legacy */
2703                                 JobType type = job_type_from_string(v);
2704                                 if (type < 0)
2705                                         log_debug("Failed to parse job type value %s", v);
2706                                 else
2707                                         u->deserialized_job = type;
2708                         }
2709                         continue;
2710                 } else if (streq(l, "inactive-exit-timestamp")) {
2711                         dual_timestamp_deserialize(v, &u->inactive_exit_timestamp);
2712                         continue;
2713                 } else if (streq(l, "active-enter-timestamp")) {
2714                         dual_timestamp_deserialize(v, &u->active_enter_timestamp);
2715                         continue;
2716                 } else if (streq(l, "active-exit-timestamp")) {
2717                         dual_timestamp_deserialize(v, &u->active_exit_timestamp);
2718                         continue;
2719                 } else if (streq(l, "inactive-enter-timestamp")) {
2720                         dual_timestamp_deserialize(v, &u->inactive_enter_timestamp);
2721                         continue;
2722                 } else if (streq(l, "condition-timestamp")) {
2723                         dual_timestamp_deserialize(v, &u->condition_timestamp);
2724                         continue;
2725                 } else if (streq(l, "assert-timestamp")) {
2726                         dual_timestamp_deserialize(v, &u->assert_timestamp);
2727                         continue;
2728                 } else if (streq(l, "condition-result")) {
2729                         int b;
2730
2731                         b = parse_boolean(v);
2732                         if (b < 0)
2733                                 log_debug("Failed to parse condition result value %s", v);
2734                         else
2735                                 u->condition_result = b;
2736
2737                         continue;
2738
2739                 } else if (streq(l, "assert-result")) {
2740                         int b;
2741
2742                         b = parse_boolean(v);
2743                         if (b < 0)
2744                                 log_debug("Failed to parse assert result value %s", v);
2745                         else
2746                                 u->assert_result = b;
2747
2748                         continue;
2749
2750                 } else if (streq(l, "transient")) {
2751                         int b;
2752
2753                         b = parse_boolean(v);
2754                         if (b < 0)
2755                                 log_debug("Failed to parse transient bool %s", v);
2756                         else
2757                                 u->transient = b;
2758
2759                         continue;
2760                 } else if (streq(l, "cgroup")) {
2761                         char *s;
2762
2763                         s = strdup(v);
2764                         if (!s)
2765                                 return -ENOMEM;
2766
2767                         if (u->cgroup_path) {
2768                                 void *p;
2769
2770                                 p = hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
2771                                 log_info("Removing cgroup_path %s from hashmap (%p)",
2772                                          u->cgroup_path, p);
2773                                 free(u->cgroup_path);
2774                         }
2775
2776                         u->cgroup_path = s;
2777                         assert(hashmap_put(u->manager->cgroup_unit, s, u) == 1);
2778
2779                         continue;
2780                 }
2781
2782                 if (unit_can_serialize(u)) {
2783                         if (rt) {
2784                                 r = exec_runtime_deserialize_item(rt, u, l, v, fds);
2785                                 if (r < 0)
2786                                         return r;
2787                                 if (r > 0)
2788                                         continue;
2789                         }
2790
2791                         r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds);
2792                         if (r < 0)
2793                                 return r;
2794                 }
2795         }
2796 }
2797
2798 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2799         Unit *device;
2800         _cleanup_free_ char *e = NULL;
2801         int r;
2802
2803         assert(u);
2804
2805         if (!what)
2806                 return 0;
2807
2808         /* Adds in links to the device node that this unit is based on */
2809
2810         if (!is_device_path(what))
2811                 return 0;
2812
2813         e = unit_name_from_path(what, ".device");
2814         if (!e)
2815                 return -ENOMEM;
2816
2817         r = manager_load_unit(u->manager, e, NULL, NULL, &device);
2818
2819         if (r < 0)
2820                 return r;
2821
2822         r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BINDS_TO, device, true);
2823         if (r < 0)
2824                 return r;
2825
2826         if (wants) {
2827                 r = unit_add_dependency(device, UNIT_WANTS, u, false);
2828                 if (r < 0)
2829                         return r;
2830         }
2831
2832         return 0;
2833 }
2834
2835 int unit_coldplug(Unit *u) {
2836         int r;
2837
2838         assert(u);
2839
2840         if (UNIT_VTABLE(u)->coldplug)
2841                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2842                         return r;
2843
2844         if (u->job) {
2845                 r = job_coldplug(u->job);
2846                 if (r < 0)
2847                         return r;
2848         } else if (u->deserialized_job >= 0) {
2849                 /* legacy */
2850                 r = manager_add_job(u->manager, u->deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL);
2851                 if (r < 0)
2852                         return r;
2853
2854                 u->deserialized_job = _JOB_TYPE_INVALID;
2855         }
2856
2857         return 0;
2858 }
2859
2860 void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) {
2861         DISABLE_WARNING_FORMAT_NONLITERAL;
2862         manager_status_printf(u->manager, STATUS_TYPE_NORMAL,
2863                               status, unit_status_msg_format, unit_description(u));
2864         REENABLE_WARNING;
2865 }
2866
2867 bool unit_need_daemon_reload(Unit *u) {
2868         _cleanup_strv_free_ char **t = NULL;
2869         char **path;
2870         struct stat st;
2871         unsigned loaded_cnt, current_cnt;
2872
2873         assert(u);
2874
2875         if (u->fragment_path) {
2876                 zero(st);
2877                 if (stat(u->fragment_path, &st) < 0)
2878                         /* What, cannot access this anymore? */
2879                         return true;
2880
2881                 if (u->fragment_mtime > 0 &&
2882                     timespec_load(&st.st_mtim) != u->fragment_mtime)
2883                         return true;
2884         }
2885
2886         if (u->source_path) {
2887                 zero(st);
2888                 if (stat(u->source_path, &st) < 0)
2889                         return true;
2890
2891                 if (u->source_mtime > 0 &&
2892                     timespec_load(&st.st_mtim) != u->source_mtime)
2893                         return true;
2894         }
2895
2896         t = unit_find_dropin_paths(u);
2897         loaded_cnt = strv_length(t);
2898         current_cnt = strv_length(u->dropin_paths);
2899
2900         if (loaded_cnt == current_cnt) {
2901                 if (loaded_cnt == 0)
2902                         return false;
2903
2904                 if (strv_overlap(u->dropin_paths, t)) {
2905                         STRV_FOREACH(path, u->dropin_paths) {
2906                                 zero(st);
2907                                 if (stat(*path, &st) < 0)
2908                                         return true;
2909
2910                                 if (u->dropin_mtime > 0 &&
2911                                     timespec_load(&st.st_mtim) > u->dropin_mtime)
2912                                         return true;
2913                         }
2914
2915                         return false;
2916                 } else
2917                         return true;
2918         } else
2919                 return true;
2920 }
2921
2922 void unit_reset_failed(Unit *u) {
2923         assert(u);
2924
2925         if (UNIT_VTABLE(u)->reset_failed)
2926                 UNIT_VTABLE(u)->reset_failed(u);
2927 }
2928
2929 Unit *unit_following(Unit *u) {
2930         assert(u);
2931
2932         if (UNIT_VTABLE(u)->following)
2933                 return UNIT_VTABLE(u)->following(u);
2934
2935         return NULL;
2936 }
2937
2938 bool unit_stop_pending(Unit *u) {
2939         assert(u);
2940
2941         /* This call does check the current state of the unit. It's
2942          * hence useful to be called from state change calls of the
2943          * unit itself, where the state isn't updated yet. This is
2944          * different from unit_inactive_or_pending() which checks both
2945          * the current state and for a queued job. */
2946
2947         return u->job && u->job->type == JOB_STOP;
2948 }
2949
2950 bool unit_inactive_or_pending(Unit *u) {
2951         assert(u);
2952
2953         /* Returns true if the unit is inactive or going down */
2954
2955         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2956                 return true;
2957
2958         if (unit_stop_pending(u))
2959                 return true;
2960
2961         return false;
2962 }
2963
2964 bool unit_active_or_pending(Unit *u) {
2965         assert(u);
2966
2967         /* Returns true if the unit is active or going up */
2968
2969         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2970                 return true;
2971
2972         if (u->job &&
2973             (u->job->type == JOB_START ||
2974              u->job->type == JOB_RELOAD_OR_START ||
2975              u->job->type == JOB_RESTART))
2976                 return true;
2977
2978         return false;
2979 }
2980
2981 int unit_kill(Unit *u, KillWho w, int signo, sd_bus_error *error) {
2982         assert(u);
2983         assert(w >= 0 && w < _KILL_WHO_MAX);
2984         assert(signo > 0);
2985         assert(signo < _NSIG);
2986
2987         if (!UNIT_VTABLE(u)->kill)
2988                 return -ENOTSUP;
2989
2990         return UNIT_VTABLE(u)->kill(u, w, signo, error);
2991 }
2992
2993 static Set *unit_pid_set(pid_t main_pid, pid_t control_pid) {
2994         Set *pid_set;
2995         int r;
2996
2997         pid_set = set_new(NULL);
2998         if (!pid_set)
2999                 return NULL;
3000
3001         /* Exclude the main/control pids from being killed via the cgroup */
3002         if (main_pid > 0) {
3003                 r = set_put(pid_set, LONG_TO_PTR(main_pid));
3004                 if (r < 0)
3005                         goto fail;
3006         }
3007
3008         if (control_pid > 0) {
3009                 r = set_put(pid_set, LONG_TO_PTR(control_pid));
3010                 if (r < 0)
3011                         goto fail;
3012         }
3013
3014         return pid_set;
3015
3016 fail:
3017         set_free(pid_set);
3018         return NULL;
3019 }
3020
3021 int unit_kill_common(
3022                 Unit *u,
3023                 KillWho who,
3024                 int signo,
3025                 pid_t main_pid,
3026                 pid_t control_pid,
3027                 sd_bus_error *error) {
3028
3029         int r = 0;
3030
3031         if (who == KILL_MAIN && main_pid <= 0) {
3032                 if (main_pid < 0)
3033                         return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_PROCESS, "%s units have no main processes", unit_type_to_string(u->type));
3034                 else
3035                         return sd_bus_error_set_const(error, BUS_ERROR_NO_SUCH_PROCESS, "No main process to kill");
3036         }
3037
3038         if (who == KILL_CONTROL && control_pid <= 0) {
3039                 if (control_pid < 0)
3040                         return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_PROCESS, "%s units have no control processes", unit_type_to_string(u->type));
3041                 else
3042                         return sd_bus_error_set_const(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
3043         }
3044
3045         if (who == KILL_CONTROL || who == KILL_ALL)
3046                 if (control_pid > 0)
3047                         if (kill(control_pid, signo) < 0)
3048                                 r = -errno;
3049
3050         if (who == KILL_MAIN || who == KILL_ALL)
3051                 if (main_pid > 0)
3052                         if (kill(main_pid, signo) < 0)
3053                                 r = -errno;
3054
3055         if (who == KILL_ALL && u->cgroup_path) {
3056                 _cleanup_set_free_ Set *pid_set = NULL;
3057                 int q;
3058
3059                 /* Exclude the main/control pids from being killed via the cgroup */
3060                 pid_set = unit_pid_set(main_pid, control_pid);
3061                 if (!pid_set)
3062                         return -ENOMEM;
3063
3064                 q = cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, signo, false, true, false, pid_set);
3065                 if (q < 0 && q != -EAGAIN && q != -ESRCH && q != -ENOENT)
3066                         r = q;
3067         }
3068
3069         return r;
3070 }
3071
3072 int unit_following_set(Unit *u, Set **s) {
3073         assert(u);
3074         assert(s);
3075
3076         if (UNIT_VTABLE(u)->following_set)
3077                 return UNIT_VTABLE(u)->following_set(u, s);
3078
3079         *s = NULL;
3080         return 0;
3081 }
3082
3083 UnitFileState unit_get_unit_file_state(Unit *u) {
3084         assert(u);
3085
3086         if (u->unit_file_state < 0 && u->fragment_path)
3087                 u->unit_file_state = unit_file_get_state(
3088                                 u->manager->running_as == SYSTEMD_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,
3089                                 NULL, basename(u->fragment_path));
3090
3091         return u->unit_file_state;
3092 }
3093
3094 int unit_get_unit_file_preset(Unit *u) {
3095         assert(u);
3096
3097         if (u->unit_file_preset < 0 && u->fragment_path)
3098                 u->unit_file_preset = unit_file_query_preset(
3099                                 u->manager->running_as == SYSTEMD_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,
3100                                 NULL, basename(u->fragment_path));
3101
3102         return u->unit_file_preset;
3103 }
3104
3105 Unit* unit_ref_set(UnitRef *ref, Unit *u) {
3106         assert(ref);
3107         assert(u);
3108
3109         if (ref->unit)
3110                 unit_ref_unset(ref);
3111
3112         ref->unit = u;
3113         LIST_PREPEND(refs, u->refs, ref);
3114         return u;
3115 }
3116
3117 void unit_ref_unset(UnitRef *ref) {
3118         assert(ref);
3119
3120         if (!ref->unit)
3121                 return;
3122
3123         LIST_REMOVE(refs, ref->unit->refs, ref);
3124         ref->unit = NULL;
3125 }
3126
3127 int unit_patch_contexts(Unit *u) {
3128         CGroupContext *cc;
3129         ExecContext *ec;
3130         unsigned i;
3131         int r;
3132
3133         assert(u);
3134
3135         /* Patch in the manager defaults into the exec and cgroup
3136          * contexts, _after_ the rest of the settings have been
3137          * initialized */
3138
3139         ec = unit_get_exec_context(u);
3140         if (ec) {
3141                 /* This only copies in the ones that need memory */
3142                 for (i = 0; i < _RLIMIT_MAX; i++)
3143                         if (u->manager->rlimit[i] && !ec->rlimit[i]) {
3144                                 ec->rlimit[i] = newdup(struct rlimit, u->manager->rlimit[i], 1);
3145                                 if (!ec->rlimit[i])
3146                                         return -ENOMEM;
3147                         }
3148
3149                 if (u->manager->running_as == SYSTEMD_USER &&
3150                     !ec->working_directory) {
3151
3152                         r = get_home_dir(&ec->working_directory);
3153                         if (r < 0)
3154                                 return r;
3155                 }
3156
3157                 if (u->manager->running_as == SYSTEMD_USER &&
3158                     (ec->syscall_whitelist ||
3159                      !set_isempty(ec->syscall_filter) ||
3160                      !set_isempty(ec->syscall_archs) ||
3161                      ec->address_families_whitelist ||
3162                      !set_isempty(ec->address_families)))
3163                         ec->no_new_privileges = true;
3164
3165                 if (ec->private_devices)
3166                         ec->capability_bounding_set_drop |= (uint64_t) 1ULL << (uint64_t) CAP_MKNOD;
3167         }
3168
3169         cc = unit_get_cgroup_context(u);
3170         if (cc) {
3171
3172                 if (ec &&
3173                     ec->private_devices &&
3174                     cc->device_policy == CGROUP_AUTO)
3175                         cc->device_policy = CGROUP_CLOSED;
3176         }
3177
3178         return 0;
3179 }
3180
3181 ExecContext *unit_get_exec_context(Unit *u) {
3182         size_t offset;
3183         assert(u);
3184
3185         if (u->type < 0)
3186                 return NULL;
3187
3188         offset = UNIT_VTABLE(u)->exec_context_offset;
3189         if (offset <= 0)
3190                 return NULL;
3191
3192         return (ExecContext*) ((uint8_t*) u + offset);
3193 }
3194
3195 KillContext *unit_get_kill_context(Unit *u) {
3196         size_t offset;
3197         assert(u);
3198
3199         if (u->type < 0)
3200                 return NULL;
3201
3202         offset = UNIT_VTABLE(u)->kill_context_offset;
3203         if (offset <= 0)
3204                 return NULL;
3205
3206         return (KillContext*) ((uint8_t*) u + offset);
3207 }
3208
3209 CGroupContext *unit_get_cgroup_context(Unit *u) {
3210         size_t offset;
3211
3212         if (u->type < 0)
3213                 return NULL;
3214
3215         offset = UNIT_VTABLE(u)->cgroup_context_offset;
3216         if (offset <= 0)
3217                 return NULL;
3218
3219         return (CGroupContext*) ((uint8_t*) u + offset);
3220 }
3221
3222 ExecRuntime *unit_get_exec_runtime(Unit *u) {
3223         size_t offset;
3224
3225         if (u->type < 0)
3226                 return NULL;
3227
3228         offset = UNIT_VTABLE(u)->exec_runtime_offset;
3229         if (offset <= 0)
3230                 return NULL;
3231
3232         return *(ExecRuntime**) ((uint8_t*) u + offset);
3233 }
3234
3235 static int unit_drop_in_dir(Unit *u, UnitSetPropertiesMode mode, bool transient, char **dir) {
3236         if (u->manager->running_as == SYSTEMD_USER) {
3237                 int r;
3238
3239                 if (mode == UNIT_PERSISTENT && !transient)
3240                         r = user_config_home(dir);
3241                 else
3242                         r = user_runtime_dir(dir);
3243
3244                 if (r == 0)
3245                         return -ENOENT;
3246                 return r;
3247         }
3248
3249         if (mode == UNIT_PERSISTENT && !transient)
3250                 *dir = strdup("/etc/systemd/system");
3251         else
3252                 *dir = strdup("/run/systemd/system");
3253         if (!*dir)
3254                 return -ENOMEM;
3255
3256         return 0;
3257 }
3258
3259 static int unit_drop_in_file(Unit *u,
3260                              UnitSetPropertiesMode mode, const char *name, char **p, char **q) {
3261         _cleanup_free_ char *dir = NULL;
3262         int r;
3263
3264         assert(u);
3265
3266         r = unit_drop_in_dir(u, mode, u->transient, &dir);
3267         if (r < 0)
3268                 return r;
3269
3270         return drop_in_file(dir, u->id, 50, name, p, q);
3271 }
3272
3273 int unit_write_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data) {
3274
3275         _cleanup_free_ char *dir = NULL;
3276         int r;
3277
3278         assert(u);
3279
3280         if (!IN_SET(mode, UNIT_PERSISTENT, UNIT_RUNTIME))
3281                 return 0;
3282
3283         r = unit_drop_in_dir(u, mode, u->transient, &dir);
3284         if (r < 0)
3285                 return r;
3286
3287         return write_drop_in(dir, u->id, 50, name, data);
3288 }
3289
3290 int unit_write_drop_in_format(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *format, ...) {
3291         _cleanup_free_ char *p = NULL;
3292         va_list ap;
3293         int r;
3294
3295         assert(u);
3296         assert(name);
3297         assert(format);
3298
3299         if (!IN_SET(mode, UNIT_PERSISTENT, UNIT_RUNTIME))
3300                 return 0;
3301
3302         va_start(ap, format);
3303         r = vasprintf(&p, format, ap);
3304         va_end(ap);
3305
3306         if (r < 0)
3307                 return -ENOMEM;
3308
3309         return unit_write_drop_in(u, mode, name, p);
3310 }
3311
3312 int unit_write_drop_in_private(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data) {
3313         _cleanup_free_ char *ndata = NULL;
3314
3315         assert(u);
3316         assert(name);
3317         assert(data);
3318
3319         if (!UNIT_VTABLE(u)->private_section)
3320                 return -EINVAL;
3321
3322         if (!IN_SET(mode, UNIT_PERSISTENT, UNIT_RUNTIME))
3323                 return 0;
3324
3325         ndata = strjoin("[", UNIT_VTABLE(u)->private_section, "]\n", data, NULL);
3326         if (!ndata)
3327                 return -ENOMEM;
3328
3329         return unit_write_drop_in(u, mode, name, ndata);
3330 }
3331
3332 int unit_write_drop_in_private_format(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *format, ...) {
3333         _cleanup_free_ char *p = NULL;
3334         va_list ap;
3335         int r;
3336
3337         assert(u);
3338         assert(name);
3339         assert(format);
3340
3341         if (!IN_SET(mode, UNIT_PERSISTENT, UNIT_RUNTIME))
3342                 return 0;
3343
3344         va_start(ap, format);
3345         r = vasprintf(&p, format, ap);
3346         va_end(ap);
3347
3348         if (r < 0)
3349                 return -ENOMEM;
3350
3351         return unit_write_drop_in_private(u, mode, name, p);
3352 }
3353
3354 int unit_remove_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name) {
3355         _cleanup_free_ char *p = NULL, *q = NULL;
3356         int r;
3357
3358         assert(u);
3359
3360         if (!IN_SET(mode, UNIT_PERSISTENT, UNIT_RUNTIME))
3361                 return 0;
3362
3363         r = unit_drop_in_file(u, mode, name, &p, &q);
3364         if (r < 0)
3365                 return r;
3366
3367         if (unlink(q) < 0)
3368                 r = errno == ENOENT ? 0 : -errno;
3369         else
3370                 r = 1;
3371
3372         rmdir(p);
3373         return r;
3374 }
3375
3376 int unit_make_transient(Unit *u) {
3377         int r;
3378
3379         assert(u);
3380
3381         u->load_state = UNIT_STUB;
3382         u->load_error = 0;
3383         u->transient = true;
3384
3385         free(u->fragment_path);
3386         u->fragment_path = NULL;
3387
3388         if (u->manager->running_as == SYSTEMD_USER) {
3389                 _cleanup_free_ char *c = NULL;
3390
3391                 r = user_runtime_dir(&c);
3392                 if (r < 0)
3393                         return r;
3394                 if (r == 0)
3395                         return -ENOENT;
3396