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01f78473 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
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 General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
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 "dbus-path.h" | |
a40eb732 | 32 | #include "special.h" |
398ef8ba | 33 | #include "bus-errors.h" |
01f78473 LP |
34 | |
35 | static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { | |
36 | [PATH_DEAD] = UNIT_INACTIVE, | |
37 | [PATH_WAITING] = UNIT_ACTIVE, | |
38 | [PATH_RUNNING] = UNIT_ACTIVE, | |
032ff4af | 39 | [PATH_MAINTENANCE] = UNIT_MAINTENANCE |
01f78473 LP |
40 | }; |
41 | ||
42 | static void path_done(Unit *u) { | |
43 | Path *p = PATH(u); | |
44 | PathSpec *s; | |
45 | ||
46 | assert(p); | |
47 | ||
48 | while ((s = p->specs)) { | |
49 | LIST_REMOVE(PathSpec, spec, p->specs, s); | |
50 | free(s); | |
51 | } | |
52 | } | |
53 | ||
54 | int path_add_one_mount_link(Path *p, Mount *m) { | |
55 | PathSpec *s; | |
56 | int r; | |
57 | ||
58 | assert(p); | |
59 | assert(m); | |
60 | ||
61 | if (p->meta.load_state != UNIT_LOADED || | |
62 | m->meta.load_state != UNIT_LOADED) | |
63 | return 0; | |
64 | ||
65 | LIST_FOREACH(spec, s, p->specs) { | |
66 | ||
67 | if (!path_startswith(s->path, m->where)) | |
68 | continue; | |
69 | ||
2c966c03 | 70 | if ((r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
01f78473 LP |
71 | return r; |
72 | } | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static int path_add_mount_links(Path *p) { | |
78 | Meta *other; | |
79 | int r; | |
80 | ||
81 | assert(p); | |
82 | ||
83 | LIST_FOREACH(units_per_type, other, p->meta.manager->units_per_type[UNIT_MOUNT]) | |
84 | if ((r = path_add_one_mount_link(p, (Mount*) other)) < 0) | |
85 | return r; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static int path_verify(Path *p) { | |
91 | assert(p); | |
92 | ||
4cd1fbcc | 93 | if (p->meta.load_state != UNIT_LOADED) |
01f78473 LP |
94 | return 0; |
95 | ||
96 | if (!p->specs) { | |
97 | log_error("%s lacks path setting. Refusing.", p->meta.id); | |
98 | return -EINVAL; | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int path_load(Unit *u) { | |
105 | Path *p = PATH(u); | |
106 | int r; | |
107 | ||
108 | assert(u); | |
109 | assert(u->meta.load_state == UNIT_STUB); | |
110 | ||
111 | if ((r = unit_load_fragment_and_dropin(u)) < 0) | |
112 | return r; | |
113 | ||
114 | if (u->meta.load_state == UNIT_LOADED) { | |
115 | ||
116 | if (!p->unit) | |
117 | if ((r = unit_load_related_unit(u, ".service", &p->unit))) | |
118 | return r; | |
119 | ||
120 | if ((r = unit_add_dependency(u, UNIT_BEFORE, p->unit, true)) < 0) | |
121 | return r; | |
122 | ||
123 | if ((r = path_add_mount_links(p)) < 0) | |
124 | return r; | |
a40eb732 LP |
125 | |
126 | /* Path units shouldn't stay around on shutdown */ | |
127 | if (p->meta.default_dependencies) | |
128 | if ((r = unit_add_two_dependencies_by_name(u, UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true)) < 0) | |
129 | return r; | |
01f78473 LP |
130 | } |
131 | ||
132 | return path_verify(p); | |
133 | } | |
134 | ||
135 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
136 | Path *p = PATH(u); | |
137 | const char *prefix2; | |
138 | char *p2; | |
139 | PathSpec *s; | |
140 | ||
141 | p2 = strappend(prefix, "\t"); | |
142 | prefix2 = p2 ? p2 : prefix; | |
143 | ||
144 | fprintf(f, | |
145 | "%sPath State: %s\n" | |
146 | "%sUnit: %s\n", | |
147 | prefix, path_state_to_string(p->state), | |
148 | prefix, p->unit->meta.id); | |
149 | ||
150 | LIST_FOREACH(spec, s, p->specs) | |
151 | fprintf(f, | |
152 | "%s%s: %s\n", | |
153 | prefix, | |
154 | path_type_to_string(s->type), | |
155 | s->path); | |
156 | ||
157 | free(p2); | |
158 | } | |
159 | ||
160 | static void path_unwatch_one(Path *p, PathSpec *s) { | |
161 | ||
162 | if (s->inotify_fd < 0) | |
163 | return; | |
164 | ||
165 | unit_unwatch_fd(UNIT(p), &s->watch); | |
166 | ||
167 | close_nointr_nofail(s->inotify_fd); | |
168 | s->inotify_fd = -1; | |
169 | } | |
170 | ||
171 | static int path_watch_one(Path *p, PathSpec *s) { | |
172 | static const int flags_table[_PATH_TYPE_MAX] = { | |
173 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF, | |
174 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
175 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_CREATE|IN_MOVED_TO | |
176 | }; | |
177 | ||
178 | bool exists = false; | |
179 | char *k; | |
180 | int r; | |
181 | ||
182 | assert(p); | |
183 | assert(s); | |
184 | ||
185 | path_unwatch_one(p, s); | |
186 | ||
187 | if (!(k = strdup(s->path))) | |
188 | return -ENOMEM; | |
189 | ||
190 | if ((s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC)) < 0) { | |
191 | r = -errno; | |
192 | goto fail; | |
193 | } | |
194 | ||
195 | if (unit_watch_fd(UNIT(p), s->inotify_fd, EPOLLIN, &s->watch) < 0) { | |
196 | r = -errno; | |
197 | goto fail; | |
198 | } | |
199 | ||
200 | if ((s->primary_wd = inotify_add_watch(s->inotify_fd, k, flags_table[s->type])) >= 0) | |
201 | exists = true; | |
202 | ||
203 | for (;;) { | |
204 | int flags; | |
205 | char *slash; | |
206 | ||
207 | /* This assumes the path was passed through path_kill_slashes()! */ | |
208 | if (!(slash = strrchr(k, '/'))) | |
209 | break; | |
210 | ||
211 | *slash = 0; | |
212 | ||
213 | flags = IN_DELETE_SELF|IN_MOVE_SELF; | |
214 | if (!exists) | |
215 | flags |= IN_CREATE | IN_MOVED_TO | IN_ATTRIB; | |
216 | ||
217 | if (inotify_add_watch(s->inotify_fd, k, flags) >= 0) | |
218 | exists = true; | |
219 | } | |
220 | ||
221 | return 0; | |
222 | ||
223 | fail: | |
224 | free(k); | |
225 | ||
226 | path_unwatch_one(p, s); | |
227 | return r; | |
228 | } | |
229 | ||
230 | static void path_unwatch(Path *p) { | |
231 | PathSpec *s; | |
232 | ||
233 | assert(p); | |
234 | ||
235 | LIST_FOREACH(spec, s, p->specs) | |
236 | path_unwatch_one(p, s); | |
237 | } | |
238 | ||
239 | static int path_watch(Path *p) { | |
240 | int r; | |
241 | PathSpec *s; | |
242 | ||
243 | assert(p); | |
244 | ||
245 | LIST_FOREACH(spec, s, p->specs) | |
246 | if ((r = path_watch_one(p, s)) < 0) | |
247 | return r; | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | static void path_set_state(Path *p, PathState state) { | |
253 | PathState old_state; | |
254 | assert(p); | |
255 | ||
256 | old_state = p->state; | |
257 | p->state = state; | |
258 | ||
259 | if (state != PATH_WAITING) | |
260 | path_unwatch(p); | |
261 | ||
262 | if (state != old_state) | |
263 | log_debug("%s changed %s -> %s", | |
264 | p->meta.id, | |
265 | path_state_to_string(old_state), | |
266 | path_state_to_string(state)); | |
267 | ||
268 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state]); | |
269 | } | |
270 | ||
271 | static void path_enter_waiting(Path *p, bool initial); | |
272 | ||
273 | static int path_coldplug(Unit *u) { | |
274 | Path *p = PATH(u); | |
275 | ||
276 | assert(p); | |
277 | assert(p->state == PATH_DEAD); | |
278 | ||
279 | if (p->deserialized_state != p->state) { | |
280 | ||
281 | if (p->deserialized_state == PATH_WAITING || | |
282 | p->deserialized_state == PATH_RUNNING) | |
283 | path_enter_waiting(p, true); | |
284 | else | |
285 | path_set_state(p, p->deserialized_state); | |
286 | } | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static void path_enter_dead(Path *p, bool success) { | |
292 | assert(p); | |
293 | ||
294 | if (!success) | |
295 | p->failure = true; | |
296 | ||
18c78fb1 | 297 | path_set_state(p, p->failure ? PATH_MAINTENANCE : PATH_DEAD); |
01f78473 LP |
298 | } |
299 | ||
300 | static void path_enter_running(Path *p) { | |
301 | int r; | |
398ef8ba LP |
302 | DBusError error; |
303 | ||
01f78473 | 304 | assert(p); |
398ef8ba | 305 | dbus_error_init(&error); |
01f78473 | 306 | |
398ef8ba | 307 | if ((r = manager_add_job(p->meta.manager, JOB_START, p->unit, JOB_REPLACE, true, &error, NULL)) < 0) |
01f78473 LP |
308 | goto fail; |
309 | ||
310 | path_set_state(p, PATH_RUNNING); | |
311 | return; | |
312 | ||
313 | fail: | |
398ef8ba | 314 | log_warning("%s failed to queue unit startup job: %s", p->meta.id, bus_error(&error, r)); |
01f78473 | 315 | path_enter_dead(p, false); |
398ef8ba LP |
316 | |
317 | dbus_error_free(&error); | |
01f78473 LP |
318 | } |
319 | ||
320 | ||
321 | static void path_enter_waiting(Path *p, bool initial) { | |
322 | PathSpec *s; | |
323 | int r; | |
324 | bool good = false; | |
325 | ||
326 | LIST_FOREACH(spec, s, p->specs) { | |
327 | ||
328 | switch (s->type) { | |
329 | ||
330 | case PATH_EXISTS: | |
331 | good = access(s->path, F_OK) >= 0; | |
332 | break; | |
333 | ||
334 | case PATH_DIRECTORY_NOT_EMPTY: | |
335 | good = dir_is_empty(s->path) == 0; | |
336 | break; | |
337 | ||
338 | case PATH_CHANGED: { | |
339 | bool b; | |
340 | ||
341 | b = access(s->path, F_OK) >= 0; | |
342 | good = !initial && b != s->previous_exists; | |
343 | s->previous_exists = b; | |
344 | break; | |
345 | } | |
346 | ||
347 | default: | |
348 | ; | |
349 | } | |
350 | ||
351 | if (good) | |
352 | break; | |
353 | } | |
354 | ||
355 | if (good) { | |
356 | path_enter_running(p); | |
357 | return; | |
358 | } | |
359 | ||
360 | if ((r = path_watch(p)) < 0) | |
361 | goto fail; | |
362 | ||
363 | path_set_state(p, PATH_WAITING); | |
364 | return; | |
365 | ||
366 | fail: | |
367 | log_warning("%s failed to enter waiting state: %s", p->meta.id, strerror(-r)); | |
368 | path_enter_dead(p, false); | |
369 | } | |
370 | ||
371 | static int path_start(Unit *u) { | |
372 | Path *p = PATH(u); | |
373 | ||
374 | assert(p); | |
18c78fb1 | 375 | assert(p->state == PATH_DEAD || p->state == PATH_MAINTENANCE); |
01f78473 LP |
376 | |
377 | if (p->unit->meta.load_state != UNIT_LOADED) | |
378 | return -ENOENT; | |
379 | ||
380 | p->failure = false; | |
381 | path_enter_waiting(p, true); | |
382 | return 0; | |
383 | } | |
384 | ||
385 | static int path_stop(Unit *u) { | |
386 | Path *p = PATH(u); | |
387 | ||
388 | assert(p); | |
389 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
390 | ||
391 | path_enter_dead(p, true); | |
392 | return 0; | |
393 | } | |
394 | ||
395 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
396 | Path *p = PATH(u); | |
397 | ||
398 | assert(u); | |
399 | assert(f); | |
400 | assert(fds); | |
401 | ||
402 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
408 | Path *p = PATH(u); | |
409 | ||
410 | assert(u); | |
411 | assert(key); | |
412 | assert(value); | |
413 | assert(fds); | |
414 | ||
415 | if (streq(key, "state")) { | |
416 | PathState state; | |
417 | ||
418 | if ((state = path_state_from_string(value)) < 0) | |
419 | log_debug("Failed to parse state value %s", value); | |
420 | else | |
421 | p->deserialized_state = state; | |
422 | } else | |
423 | log_debug("Unknown serialization key '%s'", key); | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
428 | static UnitActiveState path_active_state(Unit *u) { | |
429 | assert(u); | |
430 | ||
431 | return state_translation_table[PATH(u)->state]; | |
432 | } | |
433 | ||
434 | static const char *path_sub_state_to_string(Unit *u) { | |
435 | assert(u); | |
436 | ||
437 | return path_state_to_string(PATH(u)->state); | |
438 | } | |
439 | ||
440 | static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { | |
441 | Path *p = PATH(u); | |
442 | int l; | |
443 | ssize_t k; | |
444 | struct inotify_event *buf = NULL; | |
445 | PathSpec *s; | |
446 | ||
447 | assert(p); | |
448 | assert(fd >= 0); | |
449 | ||
450 | if (p->state != PATH_WAITING) | |
451 | return; | |
452 | ||
453 | log_debug("inotify wakeup on %s.", u->meta.id); | |
454 | ||
455 | if (events != EPOLLIN) { | |
456 | log_error("Got Invalid poll event on inotify."); | |
457 | goto fail; | |
458 | } | |
459 | ||
460 | LIST_FOREACH(spec, s, p->specs) | |
461 | if (s->inotify_fd == fd) | |
462 | break; | |
463 | ||
464 | if (!s) { | |
465 | log_error("Got event on unknown fd."); | |
466 | goto fail; | |
467 | } | |
468 | ||
469 | if (ioctl(fd, FIONREAD, &l) < 0) { | |
470 | log_error("FIONREAD failed: %s", strerror(errno)); | |
471 | goto fail; | |
472 | } | |
473 | ||
474 | if (!(buf = malloc(l))) { | |
475 | log_error("Failed to allocate buffer: %s", strerror(-ENOMEM)); | |
476 | goto fail; | |
477 | } | |
478 | ||
479 | if ((k = read(fd, buf, l)) < 0) { | |
480 | log_error("Failed to read inotify event: %s", strerror(-errno)); | |
481 | goto fail; | |
482 | } | |
483 | ||
484 | if ((size_t) k < sizeof(struct inotify_event) || | |
485 | (size_t) k < sizeof(struct inotify_event) + buf->len) { | |
486 | log_error("inotify event too small."); | |
487 | goto fail; | |
488 | } | |
489 | ||
490 | if (s->type == PATH_CHANGED && s->primary_wd == buf->wd) | |
491 | path_enter_running(p); | |
492 | else | |
493 | path_enter_waiting(p, false); | |
494 | ||
495 | free(buf); | |
496 | ||
497 | return; | |
498 | ||
499 | fail: | |
500 | free(buf); | |
501 | path_enter_dead(p, false); | |
502 | } | |
503 | ||
504 | void path_unit_notify(Unit *u, UnitActiveState new_state) { | |
505 | char *n; | |
506 | int r; | |
507 | Iterator i; | |
508 | ||
509 | if (u->meta.type == UNIT_PATH) | |
510 | return; | |
511 | ||
512 | SET_FOREACH(n, u->meta.names, i) { | |
513 | char *k; | |
514 | Unit *t; | |
515 | Path *p; | |
516 | ||
517 | if (!(k = unit_name_change_suffix(n, ".path"))) { | |
518 | r = -ENOMEM; | |
519 | goto fail; | |
520 | } | |
521 | ||
522 | t = manager_get_unit(u->meta.manager, k); | |
523 | free(k); | |
524 | ||
525 | if (!t) | |
526 | continue; | |
527 | ||
528 | if (t->meta.load_state != UNIT_LOADED) | |
529 | continue; | |
530 | ||
531 | p = PATH(t); | |
532 | ||
533 | if (p->unit != u) | |
534 | continue; | |
535 | ||
536 | if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) { | |
537 | log_debug("%s got notified about unit deactivation.", p->meta.id); | |
538 | path_enter_waiting(p, false); | |
539 | } | |
540 | } | |
541 | ||
542 | return; | |
543 | ||
544 | fail: | |
545 | log_error("Failed find path unit: %s", strerror(-r)); | |
546 | } | |
547 | ||
548 | static const char* const path_state_table[_PATH_STATE_MAX] = { | |
549 | [PATH_DEAD] = "dead", | |
550 | [PATH_WAITING] = "waiting", | |
551 | [PATH_RUNNING] = "running", | |
18c78fb1 | 552 | [PATH_MAINTENANCE] = "maintenance" |
01f78473 LP |
553 | }; |
554 | ||
555 | DEFINE_STRING_TABLE_LOOKUP(path_state, PathState); | |
556 | ||
557 | static const char* const path_type_table[_PATH_TYPE_MAX] = { | |
558 | [PATH_EXISTS] = "PathExists", | |
559 | [PATH_CHANGED] = "PathChanged", | |
560 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty" | |
561 | }; | |
562 | ||
563 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
564 | ||
565 | const UnitVTable path_vtable = { | |
566 | .suffix = ".path", | |
567 | ||
568 | .done = path_done, | |
569 | .load = path_load, | |
570 | ||
571 | .coldplug = path_coldplug, | |
572 | ||
573 | .dump = path_dump, | |
574 | ||
575 | .start = path_start, | |
576 | .stop = path_stop, | |
577 | ||
578 | .serialize = path_serialize, | |
579 | .deserialize_item = path_deserialize_item, | |
580 | ||
581 | .active_state = path_active_state, | |
582 | .sub_state_to_string = path_sub_state_to_string, | |
583 | ||
584 | .fd_event = path_fd_event, | |
585 | ||
586 | .bus_message_handler = bus_path_message_handler | |
587 | }; |