1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
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 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 #include "load-fragment.h"
30 #include "load-dropin.h"
34 Job* job_new(Manager *m, JobType type, Unit *unit) {
38 assert(type < _JOB_TYPE_MAX);
41 if (!(j = new0(Job, 1)))
45 j->id = m->current_job_id++;
49 /* We don't link it here, that's what job_dependency() is for */
54 void job_free(Job *j) {
57 /* Detach from next 'bigger' objects */
59 bus_job_send_removed_signal(j);
61 if (j->unit->meta.job == j)
62 j->unit->meta.job = NULL;
64 hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
68 /* Detach from next 'smaller' objects */
69 manager_transaction_unlink_job(j->manager, j, true);
72 LIST_REMOVE(Job, run_queue, j->manager->run_queue, j);
75 LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j);
80 JobDependency* job_dependency_new(Job *subject, Job *object, bool matters) {
85 /* Adds a new job link, which encodes that the 'subject' job
86 * needs the 'object' job in some way. If 'subject' is NULL
87 * this means the 'anchor' job (i.e. the one the user
88 * explcitily asked for) is the requester. */
90 if (!(l = new0(JobDependency, 1)))
98 LIST_PREPEND(JobDependency, subject, subject->subject_list, l);
100 LIST_PREPEND(JobDependency, subject, object->manager->transaction_anchor, l);
102 LIST_PREPEND(JobDependency, object, object->object_list, l);
107 void job_dependency_free(JobDependency *l) {
111 LIST_REMOVE(JobDependency, subject, l->subject->subject_list, l);
113 LIST_REMOVE(JobDependency, subject, l->object->manager->transaction_anchor, l);
115 LIST_REMOVE(JobDependency, object, l->object->object_list, l);
120 void job_dependency_delete(Job *subject, Job *object, bool *matters) {
125 LIST_FOREACH(object, l, object->object_list) {
126 assert(l->object == object);
128 if (l->subject == subject)
139 *matters = l->matters;
141 job_dependency_free(l);
144 void job_dump(Job *j, FILE*f, const char *prefix) {
152 "%s\tAction: %s ā %s\n"
156 prefix, j->unit->meta.id, job_type_to_string(j->type),
157 prefix, job_state_to_string(j->state),
158 prefix, yes_no(j->override));
161 bool job_is_anchor(Job *j) {
166 LIST_FOREACH(object, l, j->object_list)
173 static bool types_match(JobType a, JobType b, JobType c, JobType d) {
175 (a == c && b == d) ||
179 int job_type_merge(JobType *a, JobType b) {
183 /* Merging is associative! a merged with b merged with c is
184 * the same as a merged with c merged with b. */
186 /* Mergeability is transitive! if a can be merged with b and b
187 * with c then a also with c */
189 /* Also, if a merged with b cannot be merged with c, then
190 * either a or b cannot be merged with c either */
192 if (types_match(*a, b, JOB_START, JOB_VERIFY_ACTIVE))
194 else if (types_match(*a, b, JOB_START, JOB_RELOAD) ||
195 types_match(*a, b, JOB_START, JOB_RELOAD_OR_START) ||
196 types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD_OR_START) ||
197 types_match(*a, b, JOB_RELOAD, JOB_RELOAD_OR_START))
198 *a = JOB_RELOAD_OR_START;
199 else if (types_match(*a, b, JOB_START, JOB_RESTART) ||
200 types_match(*a, b, JOB_START, JOB_TRY_RESTART) ||
201 types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RESTART) ||
202 types_match(*a, b, JOB_RELOAD, JOB_RESTART) ||
203 types_match(*a, b, JOB_RELOAD_OR_START, JOB_RESTART) ||
204 types_match(*a, b, JOB_RELOAD_OR_START, JOB_TRY_RESTART) ||
205 types_match(*a, b, JOB_RESTART, JOB_TRY_RESTART))
207 else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD))
209 else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_TRY_RESTART) ||
210 types_match(*a, b, JOB_RELOAD, JOB_TRY_RESTART))
211 *a = JOB_TRY_RESTART;
218 bool job_type_is_mergeable(JobType a, JobType b) {
219 return job_type_merge(&a, b) >= 0;
222 bool job_type_is_superset(JobType a, JobType b) {
224 /* Checks whether operation a is a "superset" of b in its
232 return b == JOB_VERIFY_ACTIVE;
236 b == JOB_VERIFY_ACTIVE;
238 case JOB_RELOAD_OR_START:
242 b == JOB_VERIFY_ACTIVE;
247 b == JOB_VERIFY_ACTIVE ||
249 b == JOB_RELOAD_OR_START ||
250 b == JOB_TRY_RESTART;
252 case JOB_TRY_RESTART:
254 b == JOB_VERIFY_ACTIVE ||
262 bool job_type_is_conflicting(JobType a, JobType b) {
263 assert(a >= 0 && a < _JOB_TYPE_MAX);
264 assert(b >= 0 && b < _JOB_TYPE_MAX);
266 return (a == JOB_STOP) != (b == JOB_STOP);
269 bool job_type_is_redundant(JobType a, UnitActiveState b) {
275 b == UNIT_ACTIVE_RELOADING;
281 case JOB_VERIFY_ACTIVE:
284 b == UNIT_ACTIVE_RELOADING;
288 b == UNIT_ACTIVE_RELOADING;
290 case JOB_RELOAD_OR_START:
292 b == UNIT_ACTIVATING ||
293 b == UNIT_ACTIVE_RELOADING;
297 b == UNIT_ACTIVATING;
299 case JOB_TRY_RESTART:
301 b == UNIT_ACTIVATING;
304 assert_not_reached("Invalid job type");
308 bool job_is_runnable(Job *j) {
313 assert(j->installed);
315 /* Checks whether there is any job running for the units this
316 * job needs to be running after (in the case of a 'positive'
317 * job type) or before (in the case of a 'negative' job type
320 if (j->type == JOB_START ||
321 j->type == JOB_VERIFY_ACTIVE ||
322 j->type == JOB_RELOAD ||
323 j->type == JOB_RELOAD_OR_START) {
325 /* Immediate result is that the job is or might be
326 * started. In this case lets wait for the
327 * dependencies, regardless whether they are
328 * starting or stopping something. */
330 SET_FOREACH(other, j->unit->meta.dependencies[UNIT_AFTER], i)
335 /* Also, if something else is being stopped and we should
336 * change state after it, then lets wait. */
338 SET_FOREACH(other, j->unit->meta.dependencies[UNIT_BEFORE], i)
339 if (other->meta.job &&
340 (other->meta.job->type == JOB_STOP ||
341 other->meta.job->type == JOB_RESTART ||
342 other->meta.job->type == JOB_TRY_RESTART))
345 /* This means that for a service a and a service b where b
346 * shall be started after a:
348 * start a + start b ā 1st step start a, 2nd step start b
349 * start a + stop b ā 1st step stop b, 2nd step start a
350 * stop a + start b ā 1st step stop a, 2nd step start b
351 * stop a + stop b ā 1st step stop b, 2nd step stop a
353 * This has the side effect that restarts are properly
354 * synchronized too. */
359 int job_run_and_invalidate(Job *j) {
363 assert(j->installed);
365 if (j->in_run_queue) {
366 LIST_REMOVE(Job, run_queue, j->manager->run_queue, j);
367 j->in_run_queue = false;
370 if (j->state != JOB_WAITING)
373 if (!job_is_runnable(j))
376 j->state = JOB_RUNNING;
377 job_add_to_dbus_queue(j);
382 r = unit_start(j->unit);
387 case JOB_VERIFY_ACTIVE: {
388 UnitActiveState t = unit_active_state(j->unit);
389 if (UNIT_IS_ACTIVE_OR_RELOADING(t))
391 else if (t == UNIT_ACTIVATING)
399 r = unit_stop(j->unit);
403 r = unit_reload(j->unit);
406 case JOB_RELOAD_OR_START:
407 if (unit_active_state(j->unit) == UNIT_ACTIVE)
408 r = unit_reload(j->unit);
410 r = unit_start(j->unit);
414 UnitActiveState t = unit_active_state(j->unit);
415 if (t == UNIT_INACTIVE || t == UNIT_ACTIVATING) {
417 r = unit_start(j->unit);
419 r = unit_stop(j->unit);
423 case JOB_TRY_RESTART: {
424 UnitActiveState t = unit_active_state(j->unit);
425 if (t == UNIT_INACTIVE || t == UNIT_DEACTIVATING)
427 else if (t == UNIT_ACTIVATING) {
429 r = unit_start(j->unit);
431 r = unit_stop(j->unit);
436 assert_not_reached("Unknown job type");
440 r = job_finish_and_invalidate(j, true);
441 else if (r == -EAGAIN) {
442 j->state = JOB_WAITING;
445 r = job_finish_and_invalidate(j, false);
450 int job_finish_and_invalidate(Job *j, bool success) {
457 assert(j->installed);
459 log_debug("Job %s/%s finished, success=%s", j->unit->meta.id, job_type_to_string(j->type), yes_no(success));
460 job_add_to_dbus_queue(j);
462 /* Patch restart jobs so that they become normal start jobs */
463 if (success && (j->type == JOB_RESTART || j->type == JOB_TRY_RESTART)) {
465 log_debug("Converting job %s/%s ā %s/%s",
466 j->unit->meta.id, job_type_to_string(j->type),
467 j->unit->meta.id, job_type_to_string(JOB_START));
469 j->state = JOB_RUNNING;
472 job_add_to_run_queue(j);
480 /* Fail depending jobs on failure */
483 if (t == JOB_START ||
484 t == JOB_VERIFY_ACTIVE ||
485 t == JOB_RELOAD_OR_START) {
487 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
488 if (other->meta.job &&
489 (other->meta.job->type == JOB_START ||
490 other->meta.job->type == JOB_VERIFY_ACTIVE ||
491 other->meta.job->type == JOB_RELOAD_OR_START))
492 job_finish_and_invalidate(other->meta.job, false);
494 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
495 if (other->meta.job &&
496 !other->meta.job->override &&
497 (other->meta.job->type == JOB_START ||
498 other->meta.job->type == JOB_VERIFY_ACTIVE ||
499 other->meta.job->type == JOB_RELOAD_OR_START))
500 job_finish_and_invalidate(other->meta.job, false);
502 } else if (t == JOB_STOP) {
504 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
505 if (other->meta.job &&
506 (other->meta.job->type == JOB_START ||
507 other->meta.job->type == JOB_VERIFY_ACTIVE ||
508 other->meta.job->type == JOB_RELOAD_OR_START))
509 job_finish_and_invalidate(other->meta.job, false);
513 /* Try to start the next jobs that can be started */
514 SET_FOREACH(other, u->meta.dependencies[UNIT_AFTER], i)
516 job_add_to_run_queue(other->meta.job);
517 SET_FOREACH(other, u->meta.dependencies[UNIT_BEFORE], i)
519 job_add_to_run_queue(other->meta.job);
524 void job_add_to_run_queue(Job *j) {
526 assert(j->installed);
531 LIST_PREPEND(Job, run_queue, j->manager->run_queue, j);
532 j->in_run_queue = true;
535 void job_add_to_dbus_queue(Job *j) {
537 assert(j->installed);
539 if (j->in_dbus_queue)
542 LIST_PREPEND(Job, dbus_queue, j->manager->dbus_job_queue, j);
543 j->in_dbus_queue = true;
546 char *job_dbus_path(Job *j) {
551 if (asprintf(&p, "/org/freedesktop/systemd1/job/%lu", (unsigned long) j->id) < 0)
557 static const char* const job_state_table[_JOB_STATE_MAX] = {
558 [JOB_WAITING] = "waiting",
559 [JOB_RUNNING] = "running"
562 DEFINE_STRING_TABLE_LOOKUP(job_state, JobState);
564 static const char* const job_type_table[_JOB_TYPE_MAX] = {
565 [JOB_START] = "start",
566 [JOB_VERIFY_ACTIVE] = "verify-active",
568 [JOB_RELOAD] = "reload",
569 [JOB_RELOAD_OR_START] = "reload-or-start",
570 [JOB_RESTART] = "restart",
571 [JOB_TRY_RESTART] = "try-restart",
574 DEFINE_STRING_TABLE_LOOKUP(job_type, JobType);
576 static const char* const job_mode_table[_JOB_MODE_MAX] = {
578 [JOB_REPLACE] = "replace"
581 DEFINE_STRING_TABLE_LOOKUP(job_mode, JobMode);