unit.c 75.1 KB
Newer Older
1
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
Lennart Poettering's avatar
Lennart Poettering committed
2

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>
30
#include <sys/stat.h>
Lennart Poettering's avatar
Lennart Poettering committed
31
32
33
34
35
36
37
38

#include "set.h"
#include "unit.h"
#include "macro.h"
#include "strv.h"
#include "load-fragment.h"
#include "load-dropin.h"
#include "log.h"
39
40
#include "unit-name.h"
#include "specifier.h"
41
#include "dbus-unit.h"
42
#include "special.h"
43
#include "cgroup-util.h"
44
#include "missing.h"
Lennart Poettering's avatar
Lennart Poettering committed
45
46
47
48
49
50
51
52
53

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
54
        [UNIT_SNAPSHOT] = &snapshot_vtable,
55
56
        [UNIT_SWAP] = &swap_vtable,
        [UNIT_PATH] = &path_vtable
Lennart Poettering's avatar
Lennart Poettering committed
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
};

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;
74
        u->meta.deserialized_job = _JOB_TYPE_INVALID;
75
        u->meta.default_dependencies = true;
76
        u->meta.unit_file_state = _UNIT_FILE_STATE_INVALID;
Lennart Poettering's avatar
Lennart Poettering committed
77
78
79
80

        return u;
}

81
82
83
84
85
86
87
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
88
89
int unit_add_name(Unit *u, const char *text) {
        UnitType t;
90
        char *s, *i = NULL;
Lennart Poettering's avatar
Lennart Poettering committed
91
92
93
94
95
        int r;

        assert(u);
        assert(text);

96
97
98
        if (unit_name_is_template(text)) {
                if (!u->meta.instance)
                        return -EINVAL;
Lennart Poettering's avatar
Lennart Poettering committed
99

100
101
102
                s = unit_name_replace_instance(text, u->meta.instance);
        } else
                s = strdup(text);
Lennart Poettering's avatar
Lennart Poettering committed
103

104
105
        if (!s)
                return -ENOMEM;
Lennart Poettering's avatar
Lennart Poettering committed
106

107
        if (!unit_name_is_valid(s, false)) {
108
109
110
                r = -EINVAL;
                goto fail;
        }
111

112
        assert_se((t = unit_name_to_type(s)) >= 0);
Lennart Poettering's avatar
Lennart Poettering committed
113

114
115
116
117
        if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
                r = -EINVAL;
                goto fail;
        }
Lennart Poettering's avatar
Lennart Poettering committed
118

119
120
        if ((r = unit_name_to_instance(s, &i)) < 0)
                goto fail;
Lennart Poettering's avatar
Lennart Poettering committed
121

122
123
        if (i && unit_vtable[t]->no_instances) {
                r = -EINVAL;
124
                goto fail;
125
        }
126

127
128
129
        /* Ensure that this unit is either instanced or not instanced,
         * but not both. */
        if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
130
131
132
133
134
135
136
137
138
139
140
                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;
        }

141
142
143
144
145
        if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
                r = -E2BIG;
                goto fail;
        }

146
147
148
149
        if ((r = set_put(u->meta.names, s)) < 0) {
                if (r == -EEXIST)
                        r = 0;
                goto fail;
Lennart Poettering's avatar
Lennart Poettering committed
150
151
152
153
        }

        if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
                set_remove(u->meta.names, s);
154
                goto fail;
Lennart Poettering's avatar
Lennart Poettering committed
155
156
        }

157
        if (u->meta.type == _UNIT_TYPE_INVALID) {
Lennart Poettering's avatar
Lennart Poettering committed
158

159
                u->meta.type = t;
160
161
162
                u->meta.id = s;
                u->meta.instance = i;

Lennart Poettering's avatar
Lennart Poettering committed
163
                LIST_PREPEND(Meta, units_by_type, u->meta.manager->units_by_type[t], &u->meta);
164
165
166

                if (UNIT_VTABLE(u)->init)
                        UNIT_VTABLE(u)->init(u);
167
168
        } else
                free(i);
Lennart Poettering's avatar
Lennart Poettering committed
169

170
        unit_add_to_dbus_queue(u);
Lennart Poettering's avatar
Lennart Poettering committed
171
        return 0;
172
173
174
175
176
177

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

        return r;
Lennart Poettering's avatar
Lennart Poettering committed
178
179
}

180
int unit_choose_id(Unit *u, const char *name) {
181
182
        char *s, *t = NULL, *i;
        int r;
183
184
185
186

        assert(u);
        assert(name);

187
188
189
190
191
192
193
194
195
196
197
        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;
        }

198
        /* Selects one of the names of this unit as the id */
199
200
        s = set_get(u->meta.names, (char*) name);
        free(t);
201

202
        if (!s)
203
204
                return -ENOENT;

205
206
207
        if ((r = unit_name_to_instance(s, &i)) < 0)
                return r;

208
        u->meta.id = s;
209
210
211
212

        free(u->meta.instance);
        u->meta.instance = i;

213
        unit_add_to_dbus_queue(u);
214

215
216
217
        return 0;
}

Lennart Poettering's avatar
Lennart Poettering committed
218
219
220
221
222
223
224
225
226
227
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;
228
229

        unit_add_to_dbus_queue(u);
Lennart Poettering's avatar
Lennart Poettering committed
230
231
232
        return 0;
}

233
234
235
bool unit_check_gc(Unit *u) {
        assert(u);

236
237
238
        if (u->meta.load_state == UNIT_STUB)
                return true;

239
240
241
        if (UNIT_VTABLE(u)->no_gc)
                return true;

242
243
244
        if (u->meta.no_gc)
                return true;

245
246
247
248
249
250
251
252
253
254
255
256
257
        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
258
259
void unit_add_to_load_queue(Unit *u) {
        assert(u);
260
        assert(u->meta.type != _UNIT_TYPE_INVALID);
Lennart Poettering's avatar
Lennart Poettering committed
261
262
263
264
265
266
267
268

        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;
}

269
270
271
272
273
274
275
276
277
278
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;
}

279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
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);
}

297
298
void unit_add_to_dbus_queue(Unit *u) {
        assert(u);
299
        assert(u->meta.type != _UNIT_TYPE_INVALID);
300

301
        if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
302
303
                return;

304
305
        /* Shortcut things if nobody cares */
        if (!bus_has_subscriber(u->meta.manager)) {
306
307
308
309
                u->meta.sent_dbus_new_signal = true;
                return;
        }

310
311
312
313
        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
314
315
316
317
318
319
320
321
322
323
324
325
326
327
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);
328
329

                unit_add_to_gc_queue(other);
Lennart Poettering's avatar
Lennart Poettering committed
330
331
332
333
334
335
336
337
338
339
340
341
        }

        set_free(s);
}

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

        assert(u);

342
343
        bus_unit_send_removed_signal(u);

344
345
346
347
        if (u->meta.load_state != UNIT_STUB)
                if (UNIT_VTABLE(u)->done)
                        UNIT_VTABLE(u)->done(u);

Lennart Poettering's avatar
Lennart Poettering committed
348
349
350
        SET_FOREACH(t, u->meta.names, i)
                hashmap_remove_value(u->meta.manager->units, t, u);

351
352
353
354
355
356
        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
357
        if (u->meta.type != _UNIT_TYPE_INVALID)
Lennart Poettering's avatar
Lennart Poettering committed
358
                LIST_REMOVE(Meta, units_by_type, u->meta.manager->units_by_type[u->meta.type], &u->meta);
Lennart Poettering's avatar
Lennart Poettering committed
359

Lennart Poettering's avatar
Lennart Poettering committed
360
361
362
        if (u->meta.in_load_queue)
                LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);

363
364
365
        if (u->meta.in_dbus_queue)
                LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);

366
367
368
        if (u->meta.in_cleanup_queue)
                LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);

369
370
371
372
373
        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--;
        }

374
        cgroup_bonding_free_list(u->meta.cgroup_bondings, u->meta.manager->n_reloading <= 0);
Lennart Poettering's avatar
Lennart Poettering committed
375
376

        free(u->meta.description);
377
        free(u->meta.fragment_path);
Lennart Poettering's avatar
Lennart Poettering committed
378

379
        set_free_free(u->meta.names);
Lennart Poettering's avatar
Lennart Poettering committed
380

381
382
        condition_free_list(u->meta.conditions);

383
        free(u->meta.instance);
Lennart Poettering's avatar
Lennart Poettering committed
384
385
386
387
388
389
        free(u);
}

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

390
391
392
393
394
        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
395
         * shortcut failed loading to UNIT_INACTIVE_FAILED. */
Lennart Poettering's avatar
Lennart Poettering committed
396
397
398
399

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

400
401
402
403
404
405
const char* unit_sub_state_to_string(Unit *u) {
        assert(u);

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

406
407
408
static void complete_move(Set **s, Set **other) {
        assert(s);
        assert(other);
Lennart Poettering's avatar
Lennart Poettering committed
409

410
411
        if (!*other)
                return;
Lennart Poettering's avatar
Lennart Poettering committed
412
413

        if (*s)
414
415
416
417
418
419
                set_move(*s, *other);
        else {
                *s = *other;
                *other = NULL;
        }
}
Lennart Poettering's avatar
Lennart Poettering committed
420

421
422
423
static void merge_names(Unit *u, Unit *other) {
        char *t;
        Iterator i;
Lennart Poettering's avatar
Lennart Poettering committed
424

425
426
427
428
429
        assert(u);
        assert(other);

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

430
        set_free_free(other->meta.names);
431
432
433
434
435
        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
436
437
}

438
439
440
static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
        Iterator i;
        Unit *back;
Lennart Poettering's avatar
Lennart Poettering committed
441
        int r;
442
443
444
445
446

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

447
        /* Fix backwards pointers */
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
        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
468
469
470
471
472
        UnitDependency d;

        assert(u);
        assert(other);
        assert(u->meta.manager == other->meta.manager);
473
        assert(u->meta.type != _UNIT_TYPE_INVALID);
Lennart Poettering's avatar
Lennart Poettering committed
474

475
476
        other = unit_follow_merge(other);

477
478
479
        if (other == u)
                return 0;

480
481
482
        if (u->meta.type != other->meta.type)
                return -EINVAL;

483
        if (!u->meta.instance != !other->meta.instance)
Lennart Poettering's avatar
Lennart Poettering committed
484
485
                return -EINVAL;

486
        if (other->meta.load_state != UNIT_STUB &&
487
            other->meta.load_state != UNIT_ERROR)
488
                return -EEXIST;
Lennart Poettering's avatar
Lennart Poettering committed
489

490
491
492
        if (other->meta.job)
                return -EEXIST;

493
        if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
494
495
                return -EEXIST;

Lennart Poettering's avatar
Lennart Poettering committed
496
        /* Merge names */
497
        merge_names(u, other);
Lennart Poettering's avatar
Lennart Poettering committed
498
499
500

        /* Merge dependencies */
        for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
501
                merge_dependencies(u, other, d);
Lennart Poettering's avatar
Lennart Poettering committed
502

503
504
505
        other->meta.load_state = UNIT_MERGED;
        other->meta.merged_into = u;

506
507
508
509
510
511
512
        /* 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);
513
514
515
516
517
518
519
        unit_add_to_cleanup_queue(other);

        return 0;
}

int unit_merge_by_name(Unit *u, const char *name) {
        Unit *other;
520
521
        int r;
        char *s = NULL;
522
523
524
525

        assert(u);
        assert(name);

526
527
528
529
530
531
532
533
534
535
        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;
        }

536
        if (!(other = manager_get_unit(u->meta.manager, name)))
537
538
539
                r = unit_add_name(u, name);
        else
                r = unit_merge(u, other);
540

541
542
        free(s);
        return r;
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
}

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);

560
561
        if (c->std_output != EXEC_OUTPUT_KMSG &&
            c->std_output != EXEC_OUTPUT_SYSLOG &&
562
563
            c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
            c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
564
            c->std_error != EXEC_OUTPUT_KMSG &&
565
566
567
            c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
            c->std_error != EXEC_OUTPUT_KMSG &&
            c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
568
569
570
571
572
                return 0;

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

573
        if (u->meta.manager->running_as == MANAGER_SYSTEM)
574
                if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
575
576
                        return r;

Lennart Poettering's avatar
Lennart Poettering committed
577
578
579
580
581
582
583
584
585
        return 0;
}

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

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

586
        return strna(u->meta.id);
Lennart Poettering's avatar
Lennart Poettering committed
587
588
589
590
591
592
}

void unit_dump(Unit *u, FILE *f, const char *prefix) {
        char *t;
        UnitDependency d;
        Iterator i;
593
594
        char *p2;
        const char *prefix2;
595
        CGroupBonding *b;
596
597
598
599
        char
                timestamp1[FORMAT_TIMESTAMP_MAX],
                timestamp2[FORMAT_TIMESTAMP_MAX],
                timestamp3[FORMAT_TIMESTAMP_MAX],
600
601
                timestamp4[FORMAT_TIMESTAMP_MAX],
                timespan[FORMAT_TIMESPAN_MAX];
602
        Unit *following;
Lennart Poettering's avatar
Lennart Poettering committed
603
604

        assert(u);
605
        assert(u->meta.type >= 0);
Lennart Poettering's avatar
Lennart Poettering committed
606
607
608

        if (!prefix)
                prefix = "";
609
610
        p2 = strappend(prefix, "\t");
        prefix2 = p2 ? p2 : prefix;
Lennart Poettering's avatar
Lennart Poettering committed
611
612

        fprintf(f,
613
                "%s-> Unit %s:\n"
Lennart Poettering's avatar
Lennart Poettering committed
614
                "%s\tDescription: %s\n"
615
                "%s\tInstance: %s\n"
Lennart Poettering's avatar
Lennart Poettering committed
616
                "%s\tUnit Load State: %s\n"
617
                "%s\tUnit Active State: %s\n"
618
                "%s\tInactive Exit Timestamp: %s\n"
619
                "%s\tActive Enter Timestamp: %s\n"
620
                "%s\tActive Exit Timestamp: %s\n"
621
                "%s\tInactive Enter Timestamp: %s\n"
622
623
                "%s\tGC Check Good: %s\n"
                "%s\tNeed Daemon Reload: %s\n",
624
                prefix, u->meta.id,
Lennart Poettering's avatar
Lennart Poettering committed
625
                prefix, unit_description(u),
626
                prefix, strna(u->meta.instance),
627
                prefix, unit_load_state_to_string(u->meta.load_state),
628
                prefix, unit_active_state_to_string(unit_active_state(u)),
629
630
631
632
                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)),
633
634
                prefix, yes_no(unit_check_gc(u)),
                prefix, yes_no(unit_need_daemon_reload(u)));
635

Lennart Poettering's avatar
Lennart Poettering committed
636
637
638
        SET_FOREACH(t, u->meta.names, i)
                fprintf(f, "%s\tName: %s\n", prefix, t);

639
640
        if ((following = unit_following(u)))
                fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
641

642
643
644
        if (u->meta.fragment_path)
                fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);

645
646
647
        if (u->meta.job_timeout > 0)
                fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));

648
649
        condition_dump_list(u->meta.conditions, f, prefix);

650
651
652
653
654
655
656
        if (dual_timestamp_is_set(&u->meta.condition_timestamp))
                fprintf(f,
                        "%s\tCondition Timestamp: %s\n"
                        "%s\tCondition Result: %s\n",
                        prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.condition_timestamp.realtime)),
                        prefix, yes_no(u->meta.condition_result));

Lennart Poettering's avatar
Lennart Poettering committed
657
658
659
660
        for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
                Unit *other;

                SET_FOREACH(other, u->meta.dependencies[d], i)
661
                        fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
Lennart Poettering's avatar
Lennart Poettering committed
662
663
        }

664
        if (u->meta.load_state == UNIT_LOADED) {
665
                fprintf(f,
666
                        "%s\tStopWhenUnneeded: %s\n"
667
668
                        "%s\tRefuseManualStart: %s\n"
                        "%s\tRefuseManualStop: %s\n"
669
                        "%s\tDefaultDependencies: %s\n"
670
                        "%s\tOnFailureIsolate: %s\n"
671
672
                        "%s\tIgnoreOnIsolate: %s\n"
                        "%s\tIgnoreOnSnapshot: %s\n",
673
                        prefix, yes_no(u->meta.stop_when_unneeded),
674
675
                        prefix, yes_no(u->meta.refuse_manual_start),
                        prefix, yes_no(u->meta.refuse_manual_stop),
676
                        prefix, yes_no(u->meta.default_dependencies),
677
                        prefix, yes_no(u->meta.on_failure_isolate),
678
679
                        prefix, yes_no(u->meta.ignore_on_isolate),
                        prefix, yes_no(u->meta.ignore_on_snapshot));
680

681
682
683
                LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
                        fprintf(f, "%s\tControlGroup: %s:%s\n",
                                prefix, b->controller, b->path);
684

685
686
                if (UNIT_VTABLE(u)->dump)
                        UNIT_VTABLE(u)->dump(u, f, prefix2);
687
688
689
690

        } else if (u->meta.load_state == UNIT_MERGED)
                fprintf(f,
                        "%s\tMerged into: %s\n",
691
                        prefix, u->meta.merged_into->meta.id);
692
        else if (u->meta.load_state == UNIT_ERROR)
693
694
                fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));

Lennart Poettering's avatar
Lennart Poettering committed
695
696
697
698

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

699
        free(p2);
Lennart Poettering's avatar
Lennart Poettering committed
700
701
702
}

/* Common implementation for multiple backends */
703
int unit_load_fragment_and_dropin(Unit *u) {
704
705
706
707
708
        int r;

        assert(u);

        /* Load a .service file */
709
        if ((r = unit_load_fragment(u)) < 0)
710
711
                return r;

712
        if (u->meta.load_state == UNIT_STUB)
713
714
715
716
717
718
719
720
721
722
                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 */
723
int unit_load_fragment_and_dropin_optional(Unit *u) {
724
        int r;
Lennart Poettering's avatar
Lennart Poettering committed
725
726
727

        assert(u);

728
729
730
731
        /* Same as unit_load_fragment_and_dropin(), but whether
         * something can be loaded or not doesn't matter. */

        /* Load a .service file */
732
        if ((r = unit_load_fragment(u)) < 0)
Lennart Poettering's avatar
Lennart Poettering committed
733
734
                return r;

735
736
        if (u->meta.load_state == UNIT_STUB)
                u->meta.load_state = UNIT_LOADED;
737

Lennart Poettering's avatar
Lennart Poettering committed
738
        /* Load drop-in directory data */
739
        if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
Lennart Poettering's avatar
Lennart Poettering committed
740
741
                return r;

742
        return 0;
Lennart Poettering's avatar
Lennart Poettering committed
743
744
}

745
int unit_add_default_target_dependency(Unit *u, Unit *target) {
746
747
748
749
750
751
        assert(u);
        assert(target);

        if (target->meta.type != UNIT_TARGET)
                return 0;

Harald Hoyer's avatar
Harald Hoyer committed
752
        /* Only add the dependency if both units are loaded, so that
753
754
755
756
757
         * that loop check below is reliable */
        if (u->meta.load_state != UNIT_LOADED ||
            target->meta.load_state != UNIT_LOADED)
                return 0;

758
759
760
761
762
763
        /* If either side wants no automatic dependencies, then let's
         * skip this */
        if (!u->meta.default_dependencies ||
            target->meta.default_dependencies)
                return 0;

764
765
766
767
768
769
770
771
        /* Don't create loops */
        if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
                return 0;

        return unit_add_dependency(target, UNIT_AFTER, u, true);
}

static int unit_add_default_dependencies(Unit *u) {
772
773
774
775
776
777
778
        static const UnitDependency deps[] = {
                UNIT_REQUIRED_BY,
                UNIT_REQUIRED_BY_OVERRIDABLE,
                UNIT_WANTED_BY,
                UNIT_BOUND_BY
        };

779
        Unit *target;
780
781
        Iterator i;
        int r;
782
        unsigned k;
783
784
785

        assert(u);

786
787
788
789
        for (k = 0; k < ELEMENTSOF(deps); k++)
                SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
                        if ((r = unit_add_default_target_dependency(u, target)) < 0)
                                return r;
790

791
792
793
        return 0;
}

Lennart Poettering's avatar
Lennart Poettering committed
794
795
796
797
798
799
800
801
802
803
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;
        }

804
805
806
        if (u->meta.type == _UNIT_TYPE_INVALID)
                return -EINVAL;

Lennart Poettering's avatar
Lennart Poettering committed
807
808
809
        if (u->meta.load_state != UNIT_STUB)
                return 0;

810
811
        if (UNIT_VTABLE(u)->load)
                if ((r = UNIT_VTABLE(u)->load(u)) < 0)
Lennart Poettering's avatar
Lennart Poettering committed
812
                        goto fail;
813

814
        if (u->meta.load_state == UNIT_STUB) {
815
816
817
818
                r = -ENOENT;
                goto fail;
        }

819
820
821
822
823
        if (u->meta.load_state == UNIT_LOADED &&
            u->meta.default_dependencies)
                if ((r = unit_add_default_dependencies(u)) < 0)
                        goto fail;

824
825
826
827
828
829
830
831
832
833
        if (u->meta.on_failure_isolate &&
            set_size(u->meta.dependencies[UNIT_ON_FAILURE]) > 1) {

                log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
                          u->meta.id);

                r = -EINVAL;
                goto fail;
        }

834
835
836
        assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);

        unit_add_to_dbus_queue(unit_follow_merge(u));
837
        unit_add_to_gc_queue(u);
Lennart Poettering's avatar
Lennart Poettering committed
838
839
840
841

        return 0;

fail:
842
        u->meta.load_state = UNIT_ERROR;
843
        u->meta.load_error = r;
844
        unit_add_to_dbus_queue(u);
845

846
        log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
847

Lennart Poettering's avatar
Lennart Poettering committed
848
849
850
        return r;
}

851
852
853
854
855
856
857
858
859
bool unit_condition_test(Unit *u) {
        assert(u);

        dual_timestamp_get(&u->meta.condition_timestamp);
        u->meta.condition_result = condition_test_list(u->meta.conditions);

        return u->meta.condition_result;
}

Lennart Poettering's avatar
Lennart Poettering committed
860
/* Errors:
861
862
863
864
 *         -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
865
866
867
 */
int unit_start(Unit *u) {
        UnitActiveState state;
868
        Unit *following;
Lennart Poettering's avatar
Lennart Poettering committed
869
870
871

        assert(u);

872
873
874
        if (u->meta.load_state != UNIT_LOADED)
                return -EINVAL;

875
876
877
878
        /* 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
879
880
881
882
        state = unit_active_state(u);
        if (UNIT_IS_ACTIVE_OR_RELOADING(state))
                return -EALREADY;

883
        /* If the conditions failed, don't do anything at all */
884
        if (!unit_condition_test(u)) {
885
886
887
888
                log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
                return -EALREADY;
        }

889
890
891
892
893
894
895
896
897
898
        /* Forward to the main object, if we aren't it. */
        if ((following = unit_following(u))) {
                log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
                return unit_start(following);
        }

        /* 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
899
900
901
902
903
904
        /* 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. */

905
        unit_add_to_dbus_queue(u);
906
907

        unit_status_printf(u, "Starting %s...\n", unit_description(u));
Lennart Poettering's avatar
Lennart Poettering committed
908
909
910
911
912
913
914
915
916
        return UNIT_VTABLE(u)->start(u);
}

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

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

917
918
919
920
921
922
923
bool unit_can_isolate(Unit *u) {
        assert(u);

        return unit_can_start(u) &&
                u->meta.allow_isolate;
}

Lennart Poettering's avatar
Lennart Poettering committed
924
925
926
927
928
929
930
/* 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;
931
        Unit *following;
Lennart Poettering's avatar
Lennart Poettering committed
932
933
934
935

        assert(u);

        state = unit_active_state(u);
936
        if (UNIT_IS_INACTIVE_OR_FAILED(state))
Lennart Poettering's avatar
Lennart Poettering committed
937
938
                return -EALREADY;

939
940
941
942
943
        if ((following = unit_following(u))) {
                log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
                return unit_stop(following);
        }

944
945
946
        if (!UNIT_VTABLE(u)->stop)
                return -EBADR;

947
        unit_add_to_dbus_queue(u);
948
949

        unit_status_printf(u, "Stopping %s...\n", unit_description(u));
Lennart Poettering's avatar
Lennart Poettering committed
950
951
952
953
954
955
956
957
958
959
        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;
960
        Unit *following;
Lennart Poettering's avatar
Lennart Poettering committed
961
962
963

        assert(u);

964
965
966
        if (u->meta.load_state != UNIT_LOADED)
                return -EINVAL;

Lennart Poettering's avatar
Lennart Poettering committed
967
968
969
970
        if (!unit_can_reload(u))
                return -EBADR;

        state = unit_active_state(u);
971
        if (state == UNIT_RELOADING)
Lennart Poettering's avatar
Lennart Poettering committed
972
973
                return -EALREADY;

974
        if (state != UNIT_ACTIVE)
Lennart Poettering's avatar
Lennart Poettering committed
975
976
                return -ENOEXEC;

977
978
979
980
981
        if ((following = unit_following(u))) {
                log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
                return unit_reload(following);
        }

982
        unit_add_to_dbus_queue(u);
Lennart Poettering's avatar
Lennart Poettering committed
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
        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);
}

998
static void unit_check_unneeded(Unit *u) {
999
1000
        Iterator i;
        Unit *other;