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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 <sys/inotify.h> | |
23 | #include <sys/epoll.h> | |
24 | #include <sys/ioctl.h> | |
25 | #include <errno.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | #include "unit.h" | |
29 | #include "unit-name.h" | |
30 | #include "path.h" | |
31 | #include "mkdir.h" | |
32 | #include "dbus-path.h" | |
33 | #include "special.h" | |
34 | #include "path-util.h" | |
35 | #include "macro.h" | |
36 | #include "bus-util.h" | |
37 | #include "bus-error.h" | |
38 | ||
39 | static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { | |
40 | [PATH_DEAD] = UNIT_INACTIVE, | |
41 | [PATH_WAITING] = UNIT_ACTIVE, | |
42 | [PATH_RUNNING] = UNIT_ACTIVE, | |
43 | [PATH_FAILED] = UNIT_FAILED | |
44 | }; | |
45 | ||
46 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
47 | ||
48 | int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) { | |
49 | ||
50 | static const int flags_table[_PATH_TYPE_MAX] = { | |
51 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
52 | [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
53 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
54 | [PATH_MODIFIED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO|IN_MODIFY, | |
55 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO | |
56 | }; | |
57 | ||
58 | bool exists = false; | |
59 | char *slash, *oldslash = NULL; | |
60 | int r; | |
61 | ||
62 | assert(s); | |
63 | assert(s->unit); | |
64 | assert(handler); | |
65 | ||
66 | path_spec_unwatch(s); | |
67 | ||
68 | s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
69 | if (s->inotify_fd < 0) { | |
70 | r = -errno; | |
71 | goto fail; | |
72 | } | |
73 | ||
74 | r = sd_event_add_io(s->unit->manager->event, s->inotify_fd, EPOLLIN, handler, s, &s->event_source); | |
75 | if (r < 0) | |
76 | goto fail; | |
77 | ||
78 | /* This assumes the path was passed through path_kill_slashes()! */ | |
79 | ||
80 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { | |
81 | char *cut = NULL; | |
82 | int flags; | |
83 | char tmp; | |
84 | ||
85 | if (slash) { | |
86 | cut = slash + (slash == s->path); | |
87 | tmp = *cut; | |
88 | *cut = '\0'; | |
89 | ||
90 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; | |
91 | } else | |
92 | flags = flags_table[s->type]; | |
93 | ||
94 | r = inotify_add_watch(s->inotify_fd, s->path, flags); | |
95 | if (r < 0) { | |
96 | if (errno == EACCES || errno == ENOENT) { | |
97 | if (cut) | |
98 | *cut = tmp; | |
99 | break; | |
100 | } | |
101 | ||
102 | log_warning("Failed to add watch on %s: %m", s->path); | |
103 | r = -errno; | |
104 | if (cut) | |
105 | *cut = tmp; | |
106 | goto fail; | |
107 | } else { | |
108 | exists = true; | |
109 | ||
110 | /* Path exists, we don't need to watch parent | |
111 | too closely. */ | |
112 | if (oldslash) { | |
113 | char *cut2 = oldslash + (oldslash == s->path); | |
114 | char tmp2 = *cut2; | |
115 | *cut2 = '\0'; | |
116 | ||
117 | inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); | |
118 | /* Error is ignored, the worst can happen is | |
119 | we get spurious events. */ | |
120 | ||
121 | *cut2 = tmp2; | |
122 | } | |
123 | } | |
124 | ||
125 | if (cut) | |
126 | *cut = tmp; | |
127 | ||
128 | if (slash) | |
129 | oldslash = slash; | |
130 | else { | |
131 | /* whole path has been iterated over */ | |
132 | s->primary_wd = r; | |
133 | break; | |
134 | } | |
135 | } | |
136 | ||
137 | if (!exists) { | |
138 | log_error("Failed to add watch on any of the components of %s: %m", | |
139 | s->path); | |
140 | r = -errno; /* either EACCESS or ENOENT */ | |
141 | goto fail; | |
142 | } | |
143 | ||
144 | return 0; | |
145 | ||
146 | fail: | |
147 | path_spec_unwatch(s); | |
148 | return r; | |
149 | } | |
150 | ||
151 | void path_spec_unwatch(PathSpec *s) { | |
152 | assert(s); | |
153 | ||
154 | s->event_source = sd_event_source_unref(s->event_source); | |
155 | ||
156 | if (s->inotify_fd >= 0) { | |
157 | close_nointr_nofail(s->inotify_fd); | |
158 | s->inotify_fd = -1; | |
159 | } | |
160 | } | |
161 | ||
162 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { | |
163 | _cleanup_free_ uint8_t *buf = NULL; | |
164 | struct inotify_event *e; | |
165 | ssize_t k; | |
166 | int l; | |
167 | int r = 0; | |
168 | ||
169 | if (revents != EPOLLIN) { | |
170 | log_error("Got invalid poll event on inotify."); | |
171 | return -EINVAL; | |
172 | } | |
173 | ||
174 | if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) { | |
175 | log_error("FIONREAD failed: %m"); | |
176 | return -errno; | |
177 | } | |
178 | ||
179 | assert(l > 0); | |
180 | ||
181 | buf = malloc(l); | |
182 | if (!buf) | |
183 | return log_oom(); | |
184 | ||
185 | k = read(s->inotify_fd, buf, l); | |
186 | if (k < 0) { | |
187 | log_error("Failed to read inotify event: %m"); | |
188 | return -errno; | |
189 | } | |
190 | ||
191 | e = (struct inotify_event*) buf; | |
192 | ||
193 | while (k > 0) { | |
194 | size_t step; | |
195 | ||
196 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && | |
197 | s->primary_wd == e->wd) | |
198 | r = 1; | |
199 | ||
200 | step = sizeof(struct inotify_event) + e->len; | |
201 | assert(step <= (size_t) k); | |
202 | ||
203 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
204 | k -= step; | |
205 | } | |
206 | ||
207 | return r; | |
208 | } | |
209 | ||
210 | static bool path_spec_check_good(PathSpec *s, bool initial) { | |
211 | bool good = false; | |
212 | ||
213 | switch (s->type) { | |
214 | ||
215 | case PATH_EXISTS: | |
216 | good = access(s->path, F_OK) >= 0; | |
217 | break; | |
218 | ||
219 | case PATH_EXISTS_GLOB: | |
220 | good = glob_exists(s->path) > 0; | |
221 | break; | |
222 | ||
223 | case PATH_DIRECTORY_NOT_EMPTY: { | |
224 | int k; | |
225 | ||
226 | k = dir_is_empty(s->path); | |
227 | good = !(k == -ENOENT || k > 0); | |
228 | break; | |
229 | } | |
230 | ||
231 | case PATH_CHANGED: | |
232 | case PATH_MODIFIED: { | |
233 | bool b; | |
234 | ||
235 | b = access(s->path, F_OK) >= 0; | |
236 | good = !initial && b != s->previous_exists; | |
237 | s->previous_exists = b; | |
238 | break; | |
239 | } | |
240 | ||
241 | default: | |
242 | ; | |
243 | } | |
244 | ||
245 | return good; | |
246 | } | |
247 | ||
248 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { | |
249 | int r; | |
250 | ||
251 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
252 | return; | |
253 | ||
254 | r = mkdir_p_label(s->path, mode); | |
255 | if (r < 0) | |
256 | log_warning("mkdir(%s) failed: %s", s->path, strerror(-r)); | |
257 | } | |
258 | ||
259 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { | |
260 | fprintf(f, | |
261 | "%s%s: %s\n", | |
262 | prefix, | |
263 | path_type_to_string(s->type), | |
264 | s->path); | |
265 | } | |
266 | ||
267 | void path_spec_done(PathSpec *s) { | |
268 | assert(s); | |
269 | assert(s->inotify_fd == -1); | |
270 | ||
271 | free(s->path); | |
272 | } | |
273 | ||
274 | static void path_init(Unit *u) { | |
275 | Path *p = PATH(u); | |
276 | ||
277 | assert(u); | |
278 | assert(u->load_state == UNIT_STUB); | |
279 | ||
280 | p->directory_mode = 0755; | |
281 | } | |
282 | ||
283 | void path_free_specs(Path *p) { | |
284 | PathSpec *s; | |
285 | ||
286 | assert(p); | |
287 | ||
288 | while ((s = p->specs)) { | |
289 | path_spec_unwatch(s); | |
290 | LIST_REMOVE(spec, p->specs, s); | |
291 | path_spec_done(s); | |
292 | free(s); | |
293 | } | |
294 | } | |
295 | ||
296 | static void path_done(Unit *u) { | |
297 | Path *p = PATH(u); | |
298 | ||
299 | assert(p); | |
300 | ||
301 | path_free_specs(p); | |
302 | } | |
303 | ||
304 | static int path_add_mount_links(Path *p) { | |
305 | PathSpec *s; | |
306 | int r; | |
307 | ||
308 | assert(p); | |
309 | ||
310 | LIST_FOREACH(spec, s, p->specs) { | |
311 | r = unit_require_mounts_for(UNIT(p), s->path); | |
312 | if (r < 0) | |
313 | return r; | |
314 | } | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int path_verify(Path *p) { | |
320 | assert(p); | |
321 | ||
322 | if (UNIT(p)->load_state != UNIT_LOADED) | |
323 | return 0; | |
324 | ||
325 | if (!p->specs) { | |
326 | log_error_unit(UNIT(p)->id, | |
327 | "%s lacks path setting. Refusing.", UNIT(p)->id); | |
328 | return -EINVAL; | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static int path_add_default_dependencies(Path *p) { | |
335 | int r; | |
336 | ||
337 | assert(p); | |
338 | ||
339 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, | |
340 | SPECIAL_PATHS_TARGET, NULL, true); | |
341 | if (r < 0) | |
342 | return r; | |
343 | ||
344 | if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) { | |
345 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, | |
346 | SPECIAL_SYSINIT_TARGET, NULL, true); | |
347 | if (r < 0) | |
348 | return r; | |
349 | } | |
350 | ||
351 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, | |
352 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
353 | } | |
354 | ||
355 | static int path_load(Unit *u) { | |
356 | Path *p = PATH(u); | |
357 | int r; | |
358 | ||
359 | assert(u); | |
360 | assert(u->load_state == UNIT_STUB); | |
361 | ||
362 | r = unit_load_fragment_and_dropin(u); | |
363 | if (r < 0) | |
364 | return r; | |
365 | ||
366 | if (u->load_state == UNIT_LOADED) { | |
367 | ||
368 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { | |
369 | Unit *x; | |
370 | ||
371 | r = unit_load_related_unit(u, ".service", &x); | |
372 | if (r < 0) | |
373 | return r; | |
374 | ||
375 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); | |
376 | if (r < 0) | |
377 | return r; | |
378 | } | |
379 | ||
380 | r = path_add_mount_links(p); | |
381 | if (r < 0) | |
382 | return r; | |
383 | ||
384 | if (UNIT(p)->default_dependencies) { | |
385 | r = path_add_default_dependencies(p); | |
386 | if (r < 0) | |
387 | return r; | |
388 | } | |
389 | } | |
390 | ||
391 | return path_verify(p); | |
392 | } | |
393 | ||
394 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
395 | Path *p = PATH(u); | |
396 | Unit *trigger; | |
397 | PathSpec *s; | |
398 | ||
399 | assert(p); | |
400 | assert(f); | |
401 | ||
402 | trigger = UNIT_TRIGGER(u); | |
403 | ||
404 | fprintf(f, | |
405 | "%sPath State: %s\n" | |
406 | "%sResult: %s\n" | |
407 | "%sUnit: %s\n" | |
408 | "%sMakeDirectory: %s\n" | |
409 | "%sDirectoryMode: %04o\n", | |
410 | prefix, path_state_to_string(p->state), | |
411 | prefix, path_result_to_string(p->result), | |
412 | prefix, trigger ? trigger->id : "n/a", | |
413 | prefix, yes_no(p->make_directory), | |
414 | prefix, p->directory_mode); | |
415 | ||
416 | LIST_FOREACH(spec, s, p->specs) | |
417 | path_spec_dump(s, f, prefix); | |
418 | } | |
419 | ||
420 | static void path_unwatch(Path *p) { | |
421 | PathSpec *s; | |
422 | ||
423 | assert(p); | |
424 | ||
425 | LIST_FOREACH(spec, s, p->specs) | |
426 | path_spec_unwatch(s); | |
427 | } | |
428 | ||
429 | static int path_watch(Path *p) { | |
430 | int r; | |
431 | PathSpec *s; | |
432 | ||
433 | assert(p); | |
434 | ||
435 | LIST_FOREACH(spec, s, p->specs) { | |
436 | r = path_spec_watch(s, path_dispatch_io); | |
437 | if (r < 0) | |
438 | return r; | |
439 | } | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static void path_set_state(Path *p, PathState state) { | |
445 | PathState old_state; | |
446 | assert(p); | |
447 | ||
448 | old_state = p->state; | |
449 | p->state = state; | |
450 | ||
451 | if (state != PATH_WAITING && | |
452 | (state != PATH_RUNNING || p->inotify_triggered)) | |
453 | path_unwatch(p); | |
454 | ||
455 | if (state != old_state) | |
456 | log_debug("%s changed %s -> %s", | |
457 | UNIT(p)->id, | |
458 | path_state_to_string(old_state), | |
459 | path_state_to_string(state)); | |
460 | ||
461 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); | |
462 | } | |
463 | ||
464 | static void path_enter_waiting(Path *p, bool initial, bool recheck); | |
465 | ||
466 | static int path_coldplug(Unit *u) { | |
467 | Path *p = PATH(u); | |
468 | ||
469 | assert(p); | |
470 | assert(p->state == PATH_DEAD); | |
471 | ||
472 | if (p->deserialized_state != p->state) { | |
473 | ||
474 | if (p->deserialized_state == PATH_WAITING || | |
475 | p->deserialized_state == PATH_RUNNING) | |
476 | path_enter_waiting(p, true, true); | |
477 | else | |
478 | path_set_state(p, p->deserialized_state); | |
479 | } | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | static void path_enter_dead(Path *p, PathResult f) { | |
485 | assert(p); | |
486 | ||
487 | if (f != PATH_SUCCESS) | |
488 | p->result = f; | |
489 | ||
490 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); | |
491 | } | |
492 | ||
493 | static void path_enter_running(Path *p) { | |
494 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
495 | int r; | |
496 | ||
497 | assert(p); | |
498 | ||
499 | /* Don't start job if we are supposed to go down */ | |
500 | if (unit_stop_pending(UNIT(p))) | |
501 | return; | |
502 | ||
503 | r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)), | |
504 | JOB_REPLACE, true, &error, NULL); | |
505 | if (r < 0) | |
506 | goto fail; | |
507 | ||
508 | p->inotify_triggered = false; | |
509 | ||
510 | r = path_watch(p); | |
511 | if (r < 0) | |
512 | goto fail; | |
513 | ||
514 | path_set_state(p, PATH_RUNNING); | |
515 | return; | |
516 | ||
517 | fail: | |
518 | log_warning("%s failed to queue unit startup job: %s", | |
519 | UNIT(p)->id, bus_error_message(&error, r)); | |
520 | path_enter_dead(p, PATH_FAILURE_RESOURCES); | |
521 | } | |
522 | ||
523 | static bool path_check_good(Path *p, bool initial) { | |
524 | PathSpec *s; | |
525 | bool good = false; | |
526 | ||
527 | assert(p); | |
528 | ||
529 | LIST_FOREACH(spec, s, p->specs) { | |
530 | good = path_spec_check_good(s, initial); | |
531 | ||
532 | if (good) | |
533 | break; | |
534 | } | |
535 | ||
536 | return good; | |
537 | } | |
538 | ||
539 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { | |
540 | int r; | |
541 | ||
542 | if (recheck) | |
543 | if (path_check_good(p, initial)) { | |
544 | log_debug("%s got triggered.", UNIT(p)->id); | |
545 | path_enter_running(p); | |
546 | return; | |
547 | } | |
548 | ||
549 | r = path_watch(p); | |
550 | if (r < 0) | |
551 | goto fail; | |
552 | ||
553 | /* Hmm, so now we have created inotify watches, but the file | |
554 | * might have appeared/been removed by now, so we must | |
555 | * recheck */ | |
556 | ||
557 | if (recheck) | |
558 | if (path_check_good(p, false)) { | |
559 | log_debug("%s got triggered.", UNIT(p)->id); | |
560 | path_enter_running(p); | |
561 | return; | |
562 | } | |
563 | ||
564 | path_set_state(p, PATH_WAITING); | |
565 | return; | |
566 | ||
567 | fail: | |
568 | log_warning("%s failed to enter waiting state: %s", | |
569 | UNIT(p)->id, strerror(-r)); | |
570 | path_enter_dead(p, PATH_FAILURE_RESOURCES); | |
571 | } | |
572 | ||
573 | static void path_mkdir(Path *p) { | |
574 | PathSpec *s; | |
575 | ||
576 | assert(p); | |
577 | ||
578 | if (!p->make_directory) | |
579 | return; | |
580 | ||
581 | LIST_FOREACH(spec, s, p->specs) | |
582 | path_spec_mkdir(s, p->directory_mode); | |
583 | } | |
584 | ||
585 | static int path_start(Unit *u) { | |
586 | Path *p = PATH(u); | |
587 | ||
588 | assert(p); | |
589 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); | |
590 | ||
591 | if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED) | |
592 | return -ENOENT; | |
593 | ||
594 | path_mkdir(p); | |
595 | ||
596 | p->result = PATH_SUCCESS; | |
597 | path_enter_waiting(p, true, true); | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
602 | static int path_stop(Unit *u) { | |
603 | Path *p = PATH(u); | |
604 | ||
605 | assert(p); | |
606 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
607 | ||
608 | path_enter_dead(p, PATH_SUCCESS); | |
609 | return 0; | |
610 | } | |
611 | ||
612 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
613 | Path *p = PATH(u); | |
614 | ||
615 | assert(u); | |
616 | assert(f); | |
617 | assert(fds); | |
618 | ||
619 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
620 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
625 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
626 | Path *p = PATH(u); | |
627 | ||
628 | assert(u); | |
629 | assert(key); | |
630 | assert(value); | |
631 | assert(fds); | |
632 | ||
633 | if (streq(key, "state")) { | |
634 | PathState state; | |
635 | ||
636 | state = path_state_from_string(value); | |
637 | if (state < 0) | |
638 | log_debug("Failed to parse state value %s", value); | |
639 | else | |
640 | p->deserialized_state = state; | |
641 | ||
642 | } else if (streq(key, "result")) { | |
643 | PathResult f; | |
644 | ||
645 | f = path_result_from_string(value); | |
646 | if (f < 0) | |
647 | log_debug("Failed to parse result value %s", value); | |
648 | else if (f != PATH_SUCCESS) | |
649 | p->result = f; | |
650 | ||
651 | } else | |
652 | log_debug("Unknown serialization key '%s'", key); | |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
657 | _pure_ static UnitActiveState path_active_state(Unit *u) { | |
658 | assert(u); | |
659 | ||
660 | return state_translation_table[PATH(u)->state]; | |
661 | } | |
662 | ||
663 | _pure_ static const char *path_sub_state_to_string(Unit *u) { | |
664 | assert(u); | |
665 | ||
666 | return path_state_to_string(PATH(u)->state); | |
667 | } | |
668 | ||
669 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
670 | PathSpec *s = userdata; | |
671 | Path *p; | |
672 | int changed; | |
673 | ||
674 | assert(s); | |
675 | assert(s->unit); | |
676 | assert(fd >= 0); | |
677 | ||
678 | p = PATH(s->unit); | |
679 | ||
680 | if (p->state != PATH_WAITING && | |
681 | p->state != PATH_RUNNING) | |
682 | return 0; | |
683 | ||
684 | /* log_debug("inotify wakeup on %s.", u->id); */ | |
685 | ||
686 | LIST_FOREACH(spec, s, p->specs) | |
687 | if (path_spec_owns_inotify_fd(s, fd)) | |
688 | break; | |
689 | ||
690 | if (!s) { | |
691 | log_error("Got event on unknown fd."); | |
692 | goto fail; | |
693 | } | |
694 | ||
695 | changed = path_spec_fd_event(s, revents); | |
696 | if (changed < 0) | |
697 | goto fail; | |
698 | ||
699 | /* If we are already running, then remember that one event was | |
700 | * dispatched so that we restart the service only if something | |
701 | * actually changed on disk */ | |
702 | p->inotify_triggered = true; | |
703 | ||
704 | if (changed) | |
705 | path_enter_running(p); | |
706 | else | |
707 | path_enter_waiting(p, false, true); | |
708 | ||
709 | return 0; | |
710 | ||
711 | fail: | |
712 | path_enter_dead(p, PATH_FAILURE_RESOURCES); | |
713 | return 0; | |
714 | } | |
715 | ||
716 | static void path_trigger_notify(Unit *u, Unit *other) { | |
717 | Path *p = PATH(u); | |
718 | ||
719 | assert(u); | |
720 | assert(other); | |
721 | ||
722 | /* Invoked whenever the unit we trigger changes state or gains | |
723 | * or loses a job */ | |
724 | ||
725 | if (other->load_state != UNIT_LOADED) | |
726 | return; | |
727 | ||
728 | if (p->state == PATH_RUNNING && | |
729 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
730 | log_debug_unit(UNIT(p)->id, | |
731 | "%s got notified about unit deactivation.", | |
732 | UNIT(p)->id); | |
733 | ||
734 | /* Hmm, so inotify was triggered since the | |
735 | * last activation, so I guess we need to | |
736 | * recheck what is going on. */ | |
737 | path_enter_waiting(p, false, p->inotify_triggered); | |
738 | } | |
739 | } | |
740 | ||
741 | static void path_reset_failed(Unit *u) { | |
742 | Path *p = PATH(u); | |
743 | ||
744 | assert(p); | |
745 | ||
746 | if (p->state == PATH_FAILED) | |
747 | path_set_state(p, PATH_DEAD); | |
748 | ||
749 | p->result = PATH_SUCCESS; | |
750 | } | |
751 | ||
752 | static const char* const path_state_table[_PATH_STATE_MAX] = { | |
753 | [PATH_DEAD] = "dead", | |
754 | [PATH_WAITING] = "waiting", | |
755 | [PATH_RUNNING] = "running", | |
756 | [PATH_FAILED] = "failed" | |
757 | }; | |
758 | ||
759 | DEFINE_STRING_TABLE_LOOKUP(path_state, PathState); | |
760 | ||
761 | static const char* const path_type_table[_PATH_TYPE_MAX] = { | |
762 | [PATH_EXISTS] = "PathExists", | |
763 | [PATH_EXISTS_GLOB] = "PathExistsGlob", | |
764 | [PATH_CHANGED] = "PathChanged", | |
765 | [PATH_MODIFIED] = "PathModified", | |
766 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty" | |
767 | }; | |
768 | ||
769 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
770 | ||
771 | static const char* const path_result_table[_PATH_RESULT_MAX] = { | |
772 | [PATH_SUCCESS] = "success", | |
773 | [PATH_FAILURE_RESOURCES] = "resources" | |
774 | }; | |
775 | ||
776 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
777 | ||
778 | const UnitVTable path_vtable = { | |
779 | .object_size = sizeof(Path), | |
780 | ||
781 | .sections = | |
782 | "Unit\0" | |
783 | "Path\0" | |
784 | "Install\0", | |
785 | ||
786 | .init = path_init, | |
787 | .done = path_done, | |
788 | .load = path_load, | |
789 | ||
790 | .coldplug = path_coldplug, | |
791 | ||
792 | .dump = path_dump, | |
793 | ||
794 | .start = path_start, | |
795 | .stop = path_stop, | |
796 | ||
797 | .serialize = path_serialize, | |
798 | .deserialize_item = path_deserialize_item, | |
799 | ||
800 | .active_state = path_active_state, | |
801 | .sub_state_to_string = path_sub_state_to_string, | |
802 | ||
803 | .trigger_notify = path_trigger_notify, | |
804 | ||
805 | .reset_failed = path_reset_failed, | |
806 | ||
807 | .bus_interface = "org.freedesktop.systemd1.Path", | |
808 | .bus_vtable = bus_path_vtable | |
809 | }; |