unit.c 59 KB
Newer Older
Lennart Poettering's avatar
Lennart Poettering committed
1
2
/*-*- Mode: C; c-basic-offset: 8 -*-*/

3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

Lennart Poettering's avatar
Lennart Poettering committed
22
23
24
25
26
27
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/timerfd.h>
#include <sys/poll.h>
28
29
#include <stdlib.h>
#include <unistd.h>
Lennart Poettering's avatar
Lennart Poettering committed
30
31
32
33
34
35
36
37

#include "set.h"
#include "unit.h"
#include "macro.h"
#include "strv.h"
#include "load-fragment.h"
#include "load-dropin.h"
#include "log.h"
38
39
#include "unit-name.h"
#include "specifier.h"
40
#include "dbus-unit.h"
41
#include "special.h"
42
#include "cgroup-util.h"
Lennart Poettering's avatar
Lennart Poettering committed
43
44
45
46
47
48
49
50
51

const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
        [UNIT_SERVICE] = &service_vtable,
        [UNIT_TIMER] = &timer_vtable,
        [UNIT_SOCKET] = &socket_vtable,
        [UNIT_TARGET] = &target_vtable,
        [UNIT_DEVICE] = &device_vtable,
        [UNIT_MOUNT] = &mount_vtable,
        [UNIT_AUTOMOUNT] = &automount_vtable,
Maarten Lankhorst's avatar
Maarten Lankhorst committed
52
        [UNIT_SNAPSHOT] = &snapshot_vtable,
53
54
        [UNIT_SWAP] = &swap_vtable,
        [UNIT_PATH] = &path_vtable
Lennart Poettering's avatar
Lennart Poettering committed
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
};

Unit *unit_new(Manager *m) {
        Unit *u;

        assert(m);

        if (!(u = new0(Unit, 1)))
                return NULL;

        if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
                free(u);
                return NULL;
        }

        u->meta.manager = m;
        u->meta.type = _UNIT_TYPE_INVALID;
72
        u->meta.deserialized_job = _JOB_TYPE_INVALID;
73
        u->meta.default_dependencies = true;
Lennart Poettering's avatar
Lennart Poettering committed
74
75
76
77

        return u;
}

78
79
80
81
82
83
84
bool unit_has_name(Unit *u, const char *name) {
        assert(u);
        assert(name);

        return !!set_get(u->meta.names, (char*) name);
}

Lennart Poettering's avatar
Lennart Poettering committed
85
86
int unit_add_name(Unit *u, const char *text) {
        UnitType t;
87
        char *s = NULL, *i = NULL;
Lennart Poettering's avatar
Lennart Poettering committed
88
89
90
91
92
        int r;

        assert(u);
        assert(text);

93
94
95
        if (unit_name_is_template(text)) {
                if (!u->meta.instance)
                        return -EINVAL;
Lennart Poettering's avatar
Lennart Poettering committed
96

97
98
99
                s = unit_name_replace_instance(text, u->meta.instance);
        } else
                s = strdup(text);
Lennart Poettering's avatar
Lennart Poettering committed
100

101
102
        if (!s)
                return -ENOMEM;
Lennart Poettering's avatar
Lennart Poettering committed
103

104
105
106
107
        if (!unit_name_is_valid(s)) {
                r = -EINVAL;
                goto fail;
        }
108

109
        assert_se((t = unit_name_to_type(s)) >= 0);
Lennart Poettering's avatar
Lennart Poettering committed
110

111
112
113
114
        if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
                r = -EINVAL;
                goto fail;
        }
Lennart Poettering's avatar
Lennart Poettering committed
115

116
117
        if ((r = unit_name_to_instance(s, &i)) < 0)
                goto fail;
Lennart Poettering's avatar
Lennart Poettering committed
118

119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
        if (i && unit_vtable[t]->no_instances)
                goto fail;

        if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
                r = -EINVAL;
                goto fail;
        }

        if (unit_vtable[t]->no_alias &&
            !set_isempty(u->meta.names) &&
            !set_get(u->meta.names, s)) {
                r = -EEXIST;
                goto fail;
        }

134
135
136
137
138
        if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
                r = -E2BIG;
                goto fail;
        }

139
140
141
142
        if ((r = set_put(u->meta.names, s)) < 0) {
                if (r == -EEXIST)
                        r = 0;
                goto fail;
Lennart Poettering's avatar
Lennart Poettering committed
143
144
145
146
        }

        if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
                set_remove(u->meta.names, s);
147
                goto fail;
Lennart Poettering's avatar
Lennart Poettering committed
148
149
        }

150
        if (u->meta.type == _UNIT_TYPE_INVALID) {
Lennart Poettering's avatar
Lennart Poettering committed
151

152
                u->meta.type = t;
153
154
155
156
                u->meta.id = s;
                u->meta.instance = i;

                LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
157
158
159

                if (UNIT_VTABLE(u)->init)
                        UNIT_VTABLE(u)->init(u);
160
161
        } else
                free(i);
Lennart Poettering's avatar
Lennart Poettering committed
162

163
        unit_add_to_dbus_queue(u);
Lennart Poettering's avatar
Lennart Poettering committed
164
        return 0;
165
166
167
168
169
170

fail:
        free(s);
        free(i);

        return r;
Lennart Poettering's avatar
Lennart Poettering committed
171
172
}

173
int unit_choose_id(Unit *u, const char *name) {
174
        char *s, *t = NULL;
175
176
177
178

        assert(u);
        assert(name);

179
180
181
182
183
184
185
186
187
188
189
        if (unit_name_is_template(name)) {

                if (!u->meta.instance)
                        return -EINVAL;

                if (!(t = unit_name_replace_instance(name, u->meta.instance)))
                        return -ENOMEM;

                name = t;
        }

190
        /* Selects one of the names of this unit as the id */
191
192
        s = set_get(u->meta.names, (char*) name);
        free(t);
193

194
        if (!s)
195
196
197
                return -ENOENT;

        u->meta.id = s;
198
        unit_add_to_dbus_queue(u);
199

200
201
202
        return 0;
}

Lennart Poettering's avatar
Lennart Poettering committed
203
204
205
206
207
208
209
210
211
212
int unit_set_description(Unit *u, const char *description) {
        char *s;

        assert(u);

        if (!(s = strdup(description)))
                return -ENOMEM;

        free(u->meta.description);
        u->meta.description = s;
213
214

        unit_add_to_dbus_queue(u);
Lennart Poettering's avatar
Lennart Poettering committed
215
216
217
        return 0;
}

218
219
220
bool unit_check_gc(Unit *u) {
        assert(u);

221
222
223
        if (u->meta.load_state == UNIT_STUB)
                return true;

224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
        if (UNIT_VTABLE(u)->no_gc)
                return true;

        if (u->meta.job)
                return true;

        if (unit_active_state(u) != UNIT_INACTIVE)
                return true;

        if (UNIT_VTABLE(u)->check_gc)
                if (UNIT_VTABLE(u)->check_gc(u))
                        return true;

        return false;
}

Lennart Poettering's avatar
Lennart Poettering committed
240
241
void unit_add_to_load_queue(Unit *u) {
        assert(u);
242
        assert(u->meta.type != _UNIT_TYPE_INVALID);
Lennart Poettering's avatar
Lennart Poettering committed
243
244
245
246
247
248
249
250

        if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
                return;

        LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
        u->meta.in_load_queue = true;
}

251
252
253
254
255
256
257
258
259
260
void unit_add_to_cleanup_queue(Unit *u) {
        assert(u);

        if (u->meta.in_cleanup_queue)
                return;

        LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
        u->meta.in_cleanup_queue = true;
}

261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
void unit_add_to_gc_queue(Unit *u) {
        assert(u);

        if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
                return;

        if (unit_check_gc(u))
                return;

        LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
        u->meta.in_gc_queue = true;

        u->meta.manager->n_in_gc_queue ++;

        if (u->meta.manager->gc_queue_timestamp <= 0)
                u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
}

279
280
void unit_add_to_dbus_queue(Unit *u) {
        assert(u);
281
        assert(u->meta.type != _UNIT_TYPE_INVALID);
282

283
        if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
284
285
                return;

286
287
        /* Shortcut things if nobody cares */
        if (!bus_has_subscriber(u->meta.manager)) {
288
289
290
291
                u->meta.sent_dbus_new_signal = true;
                return;
        }

292
293
294
295
        LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
        u->meta.in_dbus_queue = true;
}

Lennart Poettering's avatar
Lennart Poettering committed
296
297
298
299
300
301
302
303
304
305
306
307
308
309
static void bidi_set_free(Unit *u, Set *s) {
        Iterator i;
        Unit *other;

        assert(u);

        /* Frees the set and makes sure we are dropped from the
         * inverse pointers */

        SET_FOREACH(other, s, i) {
                UnitDependency d;

                for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
                        set_remove(other->meta.dependencies[d], u);
310
311

                unit_add_to_gc_queue(other);
Lennart Poettering's avatar
Lennart Poettering committed
312
313
314
315
316
317
318
319
320
321
322
323
        }

        set_free(s);
}

void unit_free(Unit *u) {
        UnitDependency d;
        Iterator i;
        char *t;

        assert(u);

324
325
        bus_unit_send_removed_signal(u);

326
327
328
329
        if (u->meta.load_state != UNIT_STUB)
                if (UNIT_VTABLE(u)->done)
                        UNIT_VTABLE(u)->done(u);

Lennart Poettering's avatar
Lennart Poettering committed
330
331
332
        SET_FOREACH(t, u->meta.names, i)
                hashmap_remove_value(u->meta.manager->units, t, u);

333
334
335
336
337
338
        if (u->meta.job)
                job_free(u->meta.job);

        for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
                bidi_set_free(u, u->meta.dependencies[d]);

Lennart Poettering's avatar
Lennart Poettering committed
339
340
341
        if (u->meta.type != _UNIT_TYPE_INVALID)
                LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);

Lennart Poettering's avatar
Lennart Poettering committed
342
343
344
        if (u->meta.in_load_queue)
                LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);

345
346
347
        if (u->meta.in_dbus_queue)
                LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);

348
349
350
        if (u->meta.in_cleanup_queue)
                LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);

351
352
353
354
355
        if (u->meta.in_gc_queue) {
                LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
                u->meta.manager->n_in_gc_queue--;
        }

356
        cgroup_bonding_free_list(u->meta.cgroup_bondings);
Lennart Poettering's avatar
Lennart Poettering committed
357
358

        free(u->meta.description);
359
        free(u->meta.fragment_path);
Lennart Poettering's avatar
Lennart Poettering committed
360

361
        set_free_free(u->meta.names);
Lennart Poettering's avatar
Lennart Poettering committed
362

363
364
        free(u->meta.instance);

Lennart Poettering's avatar
Lennart Poettering committed
365
366
367
368
369
370
        free(u);
}

UnitActiveState unit_active_state(Unit *u) {
        assert(u);

371
372
373
374
375
376
        if (u->meta.load_state == UNIT_MERGED)
                return unit_active_state(unit_follow_merge(u));

        /* After a reload it might happen that a unit is not correctly
         * loaded but still has a process around. That's why we won't
         * shortcut failed loading to UNIT_INACTIVE_MAINTENANCE. */
Lennart Poettering's avatar
Lennart Poettering committed
377
378
379
380

        return UNIT_VTABLE(u)->active_state(u);
}

381
382
383
384
385
386
const char* unit_sub_state_to_string(Unit *u) {
        assert(u);

        return UNIT_VTABLE(u)->sub_state_to_string(u);
}

387
388
389
static void complete_move(Set **s, Set **other) {
        assert(s);
        assert(other);
Lennart Poettering's avatar
Lennart Poettering committed
390

391
392
        if (!*other)
                return;
Lennart Poettering's avatar
Lennart Poettering committed
393
394

        if (*s)
395
396
397
398
399
400
                set_move(*s, *other);
        else {
                *s = *other;
                *other = NULL;
        }
}
Lennart Poettering's avatar
Lennart Poettering committed
401

402
403
404
static void merge_names(Unit *u, Unit *other) {
        char *t;
        Iterator i;
Lennart Poettering's avatar
Lennart Poettering committed
405

406
407
408
409
410
        assert(u);
        assert(other);

        complete_move(&u->meta.names, &other->meta.names);

411
        set_free_free(other->meta.names);
412
413
414
415
416
        other->meta.names = NULL;
        other->meta.id = NULL;

        SET_FOREACH(t, u->meta.names, i)
                assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
Lennart Poettering's avatar
Lennart Poettering committed
417
418
}

419
420
421
static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
        Iterator i;
        Unit *back;
Lennart Poettering's avatar
Lennart Poettering committed
422
        int r;
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447

        assert(u);
        assert(other);
        assert(d < _UNIT_DEPENDENCY_MAX);

        SET_FOREACH(back, other->meta.dependencies[d], i) {
                UnitDependency k;

                for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
                        if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {

                                if (r == -EEXIST)
                                        set_remove(back->meta.dependencies[k], other);
                                else
                                        assert(r == -ENOENT);
                        }
        }

        complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);

        set_free(other->meta.dependencies[d]);
        other->meta.dependencies[d] = NULL;
}

int unit_merge(Unit *u, Unit *other) {
Lennart Poettering's avatar
Lennart Poettering committed
448
449
450
451
452
        UnitDependency d;

        assert(u);
        assert(other);
        assert(u->meta.manager == other->meta.manager);
453
        assert(u->meta.type != _UNIT_TYPE_INVALID);
Lennart Poettering's avatar
Lennart Poettering committed
454

455
456
        other = unit_follow_merge(other);

457
458
459
        if (other == u)
                return 0;

460
461
462
463
        if (u->meta.type != other->meta.type)
                return -EINVAL;

        if (!streq_ptr(u->meta.instance, other->meta.instance))
Lennart Poettering's avatar
Lennart Poettering committed
464
465
                return -EINVAL;

466
467
        if (other->meta.load_state != UNIT_STUB &&
            other->meta.load_state != UNIT_FAILED)
468
                return -EEXIST;
Lennart Poettering's avatar
Lennart Poettering committed
469

470
471
472
        if (other->meta.job)
                return -EEXIST;

473
        if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(unit_active_state(other)))
474
475
                return -EEXIST;

Lennart Poettering's avatar
Lennart Poettering committed
476
        /* Merge names */
477
        merge_names(u, other);
Lennart Poettering's avatar
Lennart Poettering committed
478
479
480

        /* Merge dependencies */
        for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
481
                merge_dependencies(u, other, d);
Lennart Poettering's avatar
Lennart Poettering committed
482

483
484
485
        other->meta.load_state = UNIT_MERGED;
        other->meta.merged_into = u;

486
487
488
489
490
491
492
        /* If there is still some data attached to the other node, we
         * don't need it anymore, and can free it. */
        if (other->meta.load_state != UNIT_STUB)
                if (UNIT_VTABLE(other)->done)
                        UNIT_VTABLE(other)->done(other);

        unit_add_to_dbus_queue(u);
493
494
495
496
497
498
499
        unit_add_to_cleanup_queue(other);

        return 0;
}

int unit_merge_by_name(Unit *u, const char *name) {
        Unit *other;
500
501
        int r;
        char *s = NULL;
502
503
504
505

        assert(u);
        assert(name);

506
507
508
509
510
511
512
513
514
515
        if (unit_name_is_template(name)) {
                if (!u->meta.instance)
                        return -EINVAL;

                if (!(s = unit_name_replace_instance(name, u->meta.instance)))
                        return -ENOMEM;

                name = s;
        }

516
        if (!(other = manager_get_unit(u->meta.manager, name)))
517
518
519
                r = unit_add_name(u, name);
        else
                r = unit_merge(u, other);
520

521
522
        free(s);
        return r;
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
}

Unit* unit_follow_merge(Unit *u) {
        assert(u);

        while (u->meta.load_state == UNIT_MERGED)
                assert_se(u = u->meta.merged_into);

        return u;
}

int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
        int r;

        assert(u);
        assert(c);

540
541
542
543
        if (c->std_output != EXEC_OUTPUT_KMSG &&
            c->std_output != EXEC_OUTPUT_SYSLOG &&
            c->std_error != EXEC_OUTPUT_KMSG &&
            c->std_error != EXEC_OUTPUT_SYSLOG)
544
545
546
547
548
                return 0;

        /* If syslog or kernel logging is requested, make sure our own
         * logging daemon is run first. */

549
        if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
550
551
                return r;

552
        if (u->meta.manager->running_as == MANAGER_SYSTEM)
553
                if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
554
555
                        return r;

Lennart Poettering's avatar
Lennart Poettering committed
556
557
558
559
560
561
562
563
564
        return 0;
}

const char *unit_description(Unit *u) {
        assert(u);

        if (u->meta.description)
                return u->meta.description;

565
        return u->meta.id;
Lennart Poettering's avatar
Lennart Poettering committed
566
567
568
569
570
571
}

void unit_dump(Unit *u, FILE *f, const char *prefix) {
        char *t;
        UnitDependency d;
        Iterator i;
572
573
        char *p2;
        const char *prefix2;
574
        CGroupBonding *b;
575
576
577
578
579
        char
                timestamp1[FORMAT_TIMESTAMP_MAX],
                timestamp2[FORMAT_TIMESTAMP_MAX],
                timestamp3[FORMAT_TIMESTAMP_MAX],
                timestamp4[FORMAT_TIMESTAMP_MAX];
Lennart Poettering's avatar
Lennart Poettering committed
580
581

        assert(u);
582
        assert(u->meta.type >= 0);
Lennart Poettering's avatar
Lennart Poettering committed
583
584
585

        if (!prefix)
                prefix = "";
586
587
        p2 = strappend(prefix, "\t");
        prefix2 = p2 ? p2 : prefix;
Lennart Poettering's avatar
Lennart Poettering committed
588
589

        fprintf(f,
590
                "%s-> Unit %s:\n"
Lennart Poettering's avatar
Lennart Poettering committed
591
                "%s\tDescription: %s\n"
592
                "%s\tInstance: %s\n"
Lennart Poettering's avatar
Lennart Poettering committed
593
                "%s\tUnit Load State: %s\n"
594
                "%s\tUnit Active State: %s\n"
595
                "%s\tInactive Exit Timestamp: %s\n"
596
                "%s\tActive Enter Timestamp: %s\n"
597
                "%s\tActive Exit Timestamp: %s\n"
598
                "%s\tInactive Enter Timestamp: %s\n"
599
                "%s\tGC Check Good: %s\n",
600
                prefix, u->meta.id,
Lennart Poettering's avatar
Lennart Poettering committed
601
                prefix, unit_description(u),
602
                prefix, strna(u->meta.instance),
603
                prefix, unit_load_state_to_string(u->meta.load_state),
604
                prefix, unit_active_state_to_string(unit_active_state(u)),
605
606
607
608
                prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
                prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
                prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
                prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
609
                prefix, yes_no(unit_check_gc(u)));
610

Lennart Poettering's avatar
Lennart Poettering committed
611
612
613
        SET_FOREACH(t, u->meta.names, i)
                fprintf(f, "%s\tName: %s\n", prefix, t);

614
615
616
        if (u->meta.fragment_path)
                fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);

Lennart Poettering's avatar
Lennart Poettering committed
617
618
619
620
        for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
                Unit *other;

                SET_FOREACH(other, u->meta.dependencies[d], i)
621
                        fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
Lennart Poettering's avatar
Lennart Poettering committed
622
623
        }

624
        if (u->meta.load_state == UNIT_LOADED) {
625
626
                fprintf(f,
                        "%s\tRecursive Stop: %s\n"
627
628
                        "%s\tStopWhenUnneeded: %s\n"
                        "%s\tOnlyByDependency: %s\n"
629
630
                        "%s\tDefaultDependencies: %s\n"
                        "%s\tIgnoreDependencyFailure: %s\n",
631
                        prefix, yes_no(u->meta.recursive_stop),
632
633
                        prefix, yes_no(u->meta.stop_when_unneeded),
                        prefix, yes_no(u->meta.only_by_dependency),
634
635
                        prefix, yes_no(u->meta.default_dependencies),
                        prefix, yes_no(u->meta.ignore_dependency_failure));
636

637
638
639
                LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
                        fprintf(f, "%s\tControlGroup: %s:%s\n",
                                prefix, b->controller, b->path);
640

641
642
                if (UNIT_VTABLE(u)->dump)
                        UNIT_VTABLE(u)->dump(u, f, prefix2);
643
644
645
646

        } else if (u->meta.load_state == UNIT_MERGED)
                fprintf(f,
                        "%s\tMerged into: %s\n",
647
                        prefix, u->meta.merged_into->meta.id);
Lennart Poettering's avatar
Lennart Poettering committed
648
649
650
651

        if (u->meta.job)
                job_dump(u->meta.job, f, prefix2);

652
        free(p2);
Lennart Poettering's avatar
Lennart Poettering committed
653
654
655
}

/* Common implementation for multiple backends */
656
int unit_load_fragment_and_dropin(Unit *u) {
657
658
659
660
661
        int r;

        assert(u);

        /* Load a .service file */
662
        if ((r = unit_load_fragment(u)) < 0)
663
664
                return r;

665
        if (u->meta.load_state == UNIT_STUB)
666
667
668
669
670
671
672
673
674
675
                return -ENOENT;

        /* Load drop-in directory data */
        if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
                return r;

        return 0;
}

/* Common implementation for multiple backends */
676
int unit_load_fragment_and_dropin_optional(Unit *u) {
677
        int r;
Lennart Poettering's avatar
Lennart Poettering committed
678
679
680

        assert(u);

681
682
683
684
        /* Same as unit_load_fragment_and_dropin(), but whether
         * something can be loaded or not doesn't matter. */

        /* Load a .service file */
685
        if ((r = unit_load_fragment(u)) < 0)
Lennart Poettering's avatar
Lennart Poettering committed
686
687
                return r;

688
689
        if (u->meta.load_state == UNIT_STUB)
                u->meta.load_state = UNIT_LOADED;
690

Lennart Poettering's avatar
Lennart Poettering committed
691
        /* Load drop-in directory data */
692
        if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
Lennart Poettering's avatar
Lennart Poettering committed
693
694
                return r;

695
        return 0;
Lennart Poettering's avatar
Lennart Poettering committed
696
697
}

698
699
700
701
702
703
704
705
706
707
/* Common implementation for multiple backends */
int unit_load_nop(Unit *u) {
        assert(u);

        if (u->meta.load_state == UNIT_STUB)
                u->meta.load_state = UNIT_LOADED;

        return 0;
}

Lennart Poettering's avatar
Lennart Poettering committed
708
709
710
711
712
713
714
715
716
717
int unit_load(Unit *u) {
        int r;

        assert(u);

        if (u->meta.in_load_queue) {
                LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
                u->meta.in_load_queue = false;
        }

718
719
720
        if (u->meta.type == _UNIT_TYPE_INVALID)
                return -EINVAL;

Lennart Poettering's avatar
Lennart Poettering committed
721
722
723
        if (u->meta.load_state != UNIT_STUB)
                return 0;

724
725
        if (UNIT_VTABLE(u)->load)
                if ((r = UNIT_VTABLE(u)->load(u)) < 0)
Lennart Poettering's avatar
Lennart Poettering committed
726
                        goto fail;
727

728
        if (u->meta.load_state == UNIT_STUB) {
729
730
731
732
733
734
735
                r = -ENOENT;
                goto fail;
        }

        assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);

        unit_add_to_dbus_queue(unit_follow_merge(u));
736
        unit_add_to_gc_queue(u);
Lennart Poettering's avatar
Lennart Poettering committed
737
738
739
740
741

        return 0;

fail:
        u->meta.load_state = UNIT_FAILED;
742
        unit_add_to_dbus_queue(u);
743

744
        log_notice("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
745

Lennart Poettering's avatar
Lennart Poettering committed
746
747
748
749
        return r;
}

/* Errors:
750
751
752
753
 *         -EBADR:     This unit type does not support starting.
 *         -EALREADY:  Unit is already started.
 *         -EAGAIN:    An operation is already in progress. Retry later.
 *         -ECANCELED: Too many requests for now.
Lennart Poettering's avatar
Lennart Poettering committed
754
755
756
757
758
759
 */
int unit_start(Unit *u) {
        UnitActiveState state;

        assert(u);

760
761
762
        if (u->meta.load_state != UNIT_LOADED)
                return -EINVAL;

763
764
765
766
        /* If this is already (being) started, then this will
         * succeed. Note that this will even succeed if this unit is
         * not startable by the user. This is relied on to detect when
         * we need to wait for units and when waiting is finished. */
Lennart Poettering's avatar
Lennart Poettering committed
767
768
769
770
        state = unit_active_state(u);
        if (UNIT_IS_ACTIVE_OR_RELOADING(state))
                return -EALREADY;

771
772
773
774
        /* If it is stopped, but we cannot start it, then fail */
        if (!UNIT_VTABLE(u)->start)
                return -EBADR;

Lennart Poettering's avatar
Lennart Poettering committed
775
776
777
778
779
780
        /* We don't suppress calls to ->start() here when we are
         * already starting, to allow this request to be used as a
         * "hurry up" call, for example when the unit is in some "auto
         * restart" state where it waits for a holdoff timer to elapse
         * before it will start again. */

781
        unit_add_to_dbus_queue(u);
782
783
784

        unit_status_printf(u, "Starting %s...\n", unit_description(u));

Lennart Poettering's avatar
Lennart Poettering committed
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
        return UNIT_VTABLE(u)->start(u);
}

bool unit_can_start(Unit *u) {
        assert(u);

        return !!UNIT_VTABLE(u)->start;
}

/* Errors:
 *         -EBADR:    This unit type does not support stopping.
 *         -EALREADY: Unit is already stopped.
 *         -EAGAIN:   An operation is already in progress. Retry later.
 */
int unit_stop(Unit *u) {
        UnitActiveState state;

        assert(u);

        state = unit_active_state(u);
805
        if (UNIT_IS_INACTIVE_OR_MAINTENANCE(state))
Lennart Poettering's avatar
Lennart Poettering committed
806
807
                return -EALREADY;

808
809
810
        if (!UNIT_VTABLE(u)->stop)
                return -EBADR;

811
        unit_add_to_dbus_queue(u);
812
813
814

        unit_status_printf(u, "Stopping %s...\n", unit_description(u));

Lennart Poettering's avatar
Lennart Poettering committed
815
816
817
818
819
820
821
822
823
824
825
826
827
        return UNIT_VTABLE(u)->stop(u);
}

/* Errors:
 *         -EBADR:    This unit type does not support reloading.
 *         -ENOEXEC:  Unit is not started.
 *         -EAGAIN:   An operation is already in progress. Retry later.
 */
int unit_reload(Unit *u) {
        UnitActiveState state;

        assert(u);

828
829
830
        if (u->meta.load_state != UNIT_LOADED)
                return -EINVAL;

Lennart Poettering's avatar
Lennart Poettering committed
831
832
833
834
        if (!unit_can_reload(u))
                return -EBADR;

        state = unit_active_state(u);
835
        if (unit_active_state(u) == UNIT_RELOADING)
Lennart Poettering's avatar
Lennart Poettering committed
836
837
838
839
840
                return -EALREADY;

        if (unit_active_state(u) != UNIT_ACTIVE)
                return -ENOEXEC;

841
        unit_add_to_dbus_queue(u);
Lennart Poettering's avatar
Lennart Poettering committed
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
        return UNIT_VTABLE(u)->reload(u);
}

bool unit_can_reload(Unit *u) {
        assert(u);

        if (!UNIT_VTABLE(u)->reload)
                return false;

        if (!UNIT_VTABLE(u)->can_reload)
                return true;

        return UNIT_VTABLE(u)->can_reload(u);
}

857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
static void unit_check_uneeded(Unit *u) {
        Iterator i;
        Unit *other;

        assert(u);

        /* If this service shall be shut down when unneeded then do
         * so. */

        if (!u->meta.stop_when_unneeded)
                return;

        if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
                return;

        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
                        return;

876
        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
877
878
879
880
881
882
883
                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
                        return;

        SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
                        return;

884
        log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
885
886

        /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
887
        manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
888
889
}

Lennart Poettering's avatar
Lennart Poettering committed
890
891
892
893
894
895
896
897
898
static void retroactively_start_dependencies(Unit *u) {
        Iterator i;
        Unit *other;

        assert(u);
        assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));

        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
                if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
899
                        manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
Lennart Poettering's avatar
Lennart Poettering committed
900

901
        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
Lennart Poettering's avatar
Lennart Poettering committed
902
                if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
903
                        manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
Lennart Poettering's avatar
Lennart Poettering committed
904
905
906

        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
                if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
907
                        manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
Lennart Poettering's avatar
Lennart Poettering committed
908
909
910

        SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
                if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
911
                        manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
Lennart Poettering's avatar
Lennart Poettering committed
912
913
914

        SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
                if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
915
                        manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
Lennart Poettering's avatar
Lennart Poettering committed
916
917
918
919
920
921
922
923
924
}

static void retroactively_stop_dependencies(Unit *u) {
        Iterator i;
        Unit *other;

        assert(u);
        assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));

925
926
927
928
        if (u->meta.recursive_stop) {
                /* Pull down units need us recursively if enabled */
                SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
                        if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
929
                                manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
930
931
932
933
        }

        /* Garbage collect services that might not be needed anymore, if enabled */
        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
Lennart Poettering's avatar
Lennart Poettering committed
934
                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
935
                        unit_check_uneeded(other);
936
        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
937
938
939
940
941
942
943
944
                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
                        unit_check_uneeded(other);
        SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
                        unit_check_uneeded(other);
        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
                        unit_check_uneeded(other);
945
        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
946
947
                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
                        unit_check_uneeded(other);
Lennart Poettering's avatar
Lennart Poettering committed
948
949
950
}

void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
951
        dual_timestamp ts;
952
        bool unexpected;
953

Lennart Poettering's avatar
Lennart Poettering committed
954
955
956
957
        assert(u);
        assert(os < _UNIT_ACTIVE_STATE_MAX);
        assert(ns < _UNIT_ACTIVE_STATE_MAX);

958
959
960
961
962
963
        /* Note that this is called for all low-level state changes,
         * even if they might map to the same high-level
         * UnitActiveState! That means that ns == os is OK an expected
         * behaviour here. For example: if a mount point is remounted
         * this function will be called too and the utmp code below
         * relies on that! */
Lennart Poettering's avatar
Lennart Poettering committed
964

965
        dual_timestamp_get(&ts);
966

967
        if (UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && !UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
968
                u->meta.inactive_exit_timestamp = ts;
969
        else if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
970
971
                u->meta.inactive_enter_timestamp = ts;

Lennart Poettering's avatar
Lennart Poettering committed
972
        if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
973
                u->meta.active_enter_timestamp = ts;
Lennart Poettering's avatar
Lennart Poettering committed
974
        else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
975
                u->meta.active_exit_timestamp = ts;
Lennart Poettering's avatar
Lennart Poettering committed
976

977
978
979
        if (ns != os && ns == UNIT_MAINTENANCE)
                log_notice("Unit %s entered maintenance state.", u->meta.id);

980
981
982
        if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
                cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);

983
        timer_unit_notify(u, ns);
984
        path_unit_notify(u, ns);
985

Lennart Poettering's avatar
Lennart Poettering committed
986
        if (u->meta.job) {
987
                unexpected = false;
Lennart Poettering's avatar
Lennart Poettering committed
988
989
990
991
992
993

                if (u->meta.job->state == JOB_WAITING)

                        /* So we reached a different state for this
                         * job. Let's see if we can run it now if it
                         * failed previously due to EAGAIN. */
994
                        job_add_to_run_queue(u->meta.job);
Lennart Poettering's avatar
Lennart Poettering committed
995
996


997
998
999
                /* Let's check whether this state change constitutes a
                 * finished job, or maybe cotradicts a running job and
                 * hence needs to invalidate jobs. */
Lennart Poettering's avatar
Lennart Poettering committed
1000