]>
Commit | Line | Data |
---|---|---|
d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
01f78473 LP |
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 | |
5430f7f2 LP |
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 | |
01f78473 LP |
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
01f78473 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
01f78473 LP |
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" | |
49e942b2 | 31 | #include "mkdir.h" |
01f78473 | 32 | #include "dbus-path.h" |
a40eb732 | 33 | #include "special.h" |
398ef8ba | 34 | #include "bus-errors.h" |
9eb977db | 35 | #include "path-util.h" |
01f78473 LP |
36 | |
37 | static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { | |
38 | [PATH_DEAD] = UNIT_INACTIVE, | |
39 | [PATH_WAITING] = UNIT_ACTIVE, | |
40 | [PATH_RUNNING] = UNIT_ACTIVE, | |
fdf20a31 | 41 | [PATH_FAILED] = UNIT_FAILED |
01f78473 LP |
42 | }; |
43 | ||
57020a3a LP |
44 | int path_spec_watch(PathSpec *s, Unit *u) { |
45 | ||
4b562198 MS |
46 | static const int flags_table[_PATH_TYPE_MAX] = { |
47 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
48 | [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
49 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
e9223856 | 50 | [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, |
4b562198 MS |
51 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO |
52 | }; | |
53 | ||
54 | bool exists = false; | |
55 | char *k, *slash; | |
56 | int r; | |
0e456f97 LP |
57 | |
58 | assert(u); | |
4b562198 | 59 | assert(s); |
0e456f97 | 60 | |
57020a3a | 61 | path_spec_unwatch(s, u); |
4b562198 MS |
62 | |
63 | if (!(k = strdup(s->path))) | |
64 | return -ENOMEM; | |
65 | ||
66 | if ((s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC)) < 0) { | |
67 | r = -errno; | |
68 | goto fail; | |
69 | } | |
70 | ||
71 | if (unit_watch_fd(u, s->inotify_fd, EPOLLIN, &s->watch) < 0) { | |
72 | r = -errno; | |
73 | goto fail; | |
74 | } | |
75 | ||
7ceba241 LP |
76 | s->primary_wd = inotify_add_watch(s->inotify_fd, k, flags_table[s->type]); |
77 | if (s->primary_wd >= 0) | |
4b562198 MS |
78 | exists = true; |
79 | ||
80 | do { | |
81 | int flags; | |
82 | ||
83 | /* This assumes the path was passed through path_kill_slashes()! */ | |
7ceba241 LP |
84 | slash = strrchr(k, '/'); |
85 | if (!slash) | |
4b562198 MS |
86 | break; |
87 | ||
88 | /* Trim the path at the last slash. Keep the slash if it's the root dir. */ | |
89 | slash[slash == k] = 0; | |
90 | ||
91 | flags = IN_MOVE_SELF; | |
92 | if (!exists) | |
93 | flags |= IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; | |
94 | ||
95 | if (inotify_add_watch(s->inotify_fd, k, flags) >= 0) | |
96 | exists = true; | |
97 | } while (slash != k); | |
98 | ||
99 | return 0; | |
100 | ||
101 | fail: | |
102 | free(k); | |
103 | ||
57020a3a | 104 | path_spec_unwatch(s, u); |
4b562198 | 105 | return r; |
0e456f97 LP |
106 | } |
107 | ||
57020a3a | 108 | void path_spec_unwatch(PathSpec *s, Unit *u) { |
62347bc2 LP |
109 | |
110 | if (s->inotify_fd < 0) | |
111 | return; | |
112 | ||
4b562198 | 113 | unit_unwatch_fd(u, &s->watch); |
62347bc2 LP |
114 | |
115 | close_nointr_nofail(s->inotify_fd); | |
116 | s->inotify_fd = -1; | |
117 | } | |
118 | ||
57020a3a | 119 | int path_spec_fd_event(PathSpec *s, uint32_t events) { |
4b562198 MS |
120 | uint8_t *buf = NULL; |
121 | struct inotify_event *e; | |
122 | ssize_t k; | |
123 | int l; | |
124 | int r = 0; | |
125 | ||
126 | if (events != EPOLLIN) { | |
15f55e80 | 127 | log_error("Got invalid poll event on inotify."); |
4b562198 MS |
128 | r = -EINVAL; |
129 | goto out; | |
130 | } | |
131 | ||
132 | if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) { | |
133 | log_error("FIONREAD failed: %m"); | |
134 | r = -errno; | |
135 | goto out; | |
136 | } | |
137 | ||
138 | assert(l > 0); | |
139 | ||
15f55e80 ZJS |
140 | buf = malloc(l); |
141 | if (!buf) { | |
4b562198 MS |
142 | log_error("Failed to allocate buffer: %m"); |
143 | r = -errno; | |
144 | goto out; | |
145 | } | |
146 | ||
15f55e80 ZJS |
147 | k = read(s->inotify_fd, buf, l); |
148 | if (k < 0) { | |
4b562198 MS |
149 | log_error("Failed to read inotify event: %m"); |
150 | r = -errno; | |
151 | goto out; | |
152 | } | |
153 | ||
154 | e = (struct inotify_event*) buf; | |
155 | ||
156 | while (k > 0) { | |
157 | size_t step; | |
158 | ||
714d943f MS |
159 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && |
160 | s->primary_wd == e->wd) | |
4b562198 MS |
161 | r = 1; |
162 | ||
163 | step = sizeof(struct inotify_event) + e->len; | |
164 | assert(step <= (size_t) k); | |
165 | ||
166 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
167 | k -= step; | |
168 | } | |
169 | out: | |
170 | free(buf); | |
171 | return r; | |
172 | } | |
173 | ||
57020a3a | 174 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
175 | bool good = false; |
176 | ||
177 | switch (s->type) { | |
178 | ||
179 | case PATH_EXISTS: | |
180 | good = access(s->path, F_OK) >= 0; | |
181 | break; | |
182 | ||
183 | case PATH_EXISTS_GLOB: | |
184 | good = glob_exists(s->path) > 0; | |
185 | break; | |
186 | ||
187 | case PATH_DIRECTORY_NOT_EMPTY: { | |
188 | int k; | |
189 | ||
190 | k = dir_is_empty(s->path); | |
191 | good = !(k == -ENOENT || k > 0); | |
192 | break; | |
193 | } | |
194 | ||
714d943f MS |
195 | case PATH_CHANGED: |
196 | case PATH_MODIFIED: { | |
4b562198 MS |
197 | bool b; |
198 | ||
199 | b = access(s->path, F_OK) >= 0; | |
200 | good = !initial && b != s->previous_exists; | |
201 | s->previous_exists = b; | |
202 | break; | |
203 | } | |
204 | ||
205 | default: | |
206 | ; | |
207 | } | |
208 | ||
209 | return good; | |
210 | } | |
211 | ||
57020a3a | 212 | static bool path_spec_startswith(PathSpec *s, const char *what) { |
4b562198 MS |
213 | return path_startswith(s->path, what); |
214 | } | |
215 | ||
57020a3a | 216 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
217 | int r; |
218 | ||
219 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
220 | return; | |
221 | ||
15f55e80 ZJS |
222 | r = mkdir_p_label(s->path, mode); |
223 | if (r < 0) | |
4b562198 MS |
224 | log_warning("mkdir(%s) failed: %s", s->path, strerror(-r)); |
225 | } | |
226 | ||
57020a3a | 227 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
228 | fprintf(f, |
229 | "%s%s: %s\n", | |
230 | prefix, | |
231 | path_type_to_string(s->type), | |
232 | s->path); | |
233 | } | |
234 | ||
57020a3a LP |
235 | void path_spec_done(PathSpec *s) { |
236 | assert(s); | |
4b562198 | 237 | assert(s->inotify_fd == -1); |
57020a3a | 238 | |
4b562198 MS |
239 | free(s->path); |
240 | } | |
241 | ||
242 | static void path_init(Unit *u) { | |
243 | Path *p = PATH(u); | |
244 | ||
245 | assert(u); | |
ac155bb8 | 246 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
247 | |
248 | p->directory_mode = 0755; | |
249 | } | |
250 | ||
74051b9b | 251 | void path_free_specs(Path *p) { |
01f78473 LP |
252 | PathSpec *s; |
253 | ||
254 | assert(p); | |
255 | ||
256 | while ((s = p->specs)) { | |
74051b9b | 257 | path_spec_unwatch(s, UNIT(p)); |
01f78473 | 258 | LIST_REMOVE(PathSpec, spec, p->specs, s); |
57020a3a | 259 | path_spec_done(s); |
01f78473 LP |
260 | free(s); |
261 | } | |
262 | } | |
263 | ||
74051b9b LP |
264 | static void path_done(Unit *u) { |
265 | Path *p = PATH(u); | |
266 | ||
267 | assert(p); | |
268 | ||
269 | unit_ref_unset(&p->unit); | |
270 | path_free_specs(p); | |
271 | } | |
272 | ||
01f78473 LP |
273 | int path_add_one_mount_link(Path *p, Mount *m) { |
274 | PathSpec *s; | |
275 | int r; | |
276 | ||
277 | assert(p); | |
278 | assert(m); | |
279 | ||
1124fe6f MS |
280 | if (UNIT(p)->load_state != UNIT_LOADED || |
281 | UNIT(m)->load_state != UNIT_LOADED) | |
01f78473 LP |
282 | return 0; |
283 | ||
284 | LIST_FOREACH(spec, s, p->specs) { | |
285 | ||
57020a3a | 286 | if (!path_spec_startswith(s, m->where)) |
01f78473 LP |
287 | continue; |
288 | ||
2c966c03 | 289 | if ((r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
01f78473 LP |
290 | return r; |
291 | } | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static int path_add_mount_links(Path *p) { | |
ac155bb8 | 297 | Unit *other; |
01f78473 LP |
298 | int r; |
299 | ||
300 | assert(p); | |
301 | ||
1124fe6f | 302 | LIST_FOREACH(units_by_type, other, UNIT(p)->manager->units_by_type[UNIT_MOUNT]) |
595ed347 | 303 | if ((r = path_add_one_mount_link(p, MOUNT(other))) < 0) |
01f78473 LP |
304 | return r; |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static int path_verify(Path *p) { | |
310 | assert(p); | |
311 | ||
1124fe6f | 312 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
313 | return 0; |
314 | ||
315 | if (!p->specs) { | |
66870f90 ZJS |
316 | log_error_unit(UNIT(p)->id, |
317 | "%s lacks path setting. Refusing.", UNIT(p)->id); | |
01f78473 LP |
318 | return -EINVAL; |
319 | } | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
6c155fe3 LP |
324 | static int path_add_default_dependencies(Path *p) { |
325 | int r; | |
326 | ||
327 | assert(p); | |
328 | ||
67445f4e | 329 | if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) { |
2a77d31d LP |
330 | if ((r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0) |
331 | return r; | |
332 | ||
6c155fe3 LP |
333 | if ((r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0) |
334 | return r; | |
2a77d31d | 335 | } |
6c155fe3 | 336 | |
ead8e478 | 337 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); |
6c155fe3 LP |
338 | } |
339 | ||
01f78473 LP |
340 | static int path_load(Unit *u) { |
341 | Path *p = PATH(u); | |
342 | int r; | |
343 | ||
344 | assert(u); | |
ac155bb8 | 345 | assert(u->load_state == UNIT_STUB); |
01f78473 LP |
346 | |
347 | if ((r = unit_load_fragment_and_dropin(u)) < 0) | |
348 | return r; | |
349 | ||
ac155bb8 | 350 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 351 | |
57020a3a LP |
352 | if (!UNIT_DEREF(p->unit)) { |
353 | Unit *x; | |
354 | ||
355 | r = unit_load_related_unit(u, ".service", &x); | |
356 | if (r < 0) | |
01f78473 LP |
357 | return r; |
358 | ||
57020a3a LP |
359 | unit_ref_set(&p->unit, x); |
360 | } | |
361 | ||
362 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(p->unit), true); | |
363 | if (r < 0) | |
01f78473 LP |
364 | return r; |
365 | ||
366 | if ((r = path_add_mount_links(p)) < 0) | |
367 | return r; | |
a40eb732 | 368 | |
1124fe6f | 369 | if (UNIT(p)->default_dependencies) |
6c155fe3 | 370 | if ((r = path_add_default_dependencies(p)) < 0) |
a40eb732 | 371 | return r; |
01f78473 LP |
372 | } |
373 | ||
374 | return path_verify(p); | |
375 | } | |
376 | ||
377 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
378 | Path *p = PATH(u); | |
01f78473 LP |
379 | PathSpec *s; |
380 | ||
e364ad06 LP |
381 | assert(p); |
382 | assert(f); | |
01f78473 LP |
383 | |
384 | fprintf(f, | |
385 | "%sPath State: %s\n" | |
cd43ca73 | 386 | "%sResult: %s\n" |
0e456f97 LP |
387 | "%sUnit: %s\n" |
388 | "%sMakeDirectory: %s\n" | |
389 | "%sDirectoryMode: %04o\n", | |
01f78473 | 390 | prefix, path_state_to_string(p->state), |
cd43ca73 | 391 | prefix, path_result_to_string(p->result), |
ac155bb8 | 392 | prefix, UNIT_DEREF(p->unit)->id, |
0e456f97 LP |
393 | prefix, yes_no(p->make_directory), |
394 | prefix, p->directory_mode); | |
01f78473 LP |
395 | |
396 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 397 | path_spec_dump(s, f, prefix); |
01f78473 LP |
398 | } |
399 | ||
400 | static void path_unwatch(Path *p) { | |
401 | PathSpec *s; | |
402 | ||
403 | assert(p); | |
404 | ||
405 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 406 | path_spec_unwatch(s, UNIT(p)); |
01f78473 LP |
407 | } |
408 | ||
409 | static int path_watch(Path *p) { | |
410 | int r; | |
411 | PathSpec *s; | |
412 | ||
413 | assert(p); | |
414 | ||
415 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 416 | if ((r = path_spec_watch(s, UNIT(p))) < 0) |
01f78473 LP |
417 | return r; |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | static void path_set_state(Path *p, PathState state) { | |
423 | PathState old_state; | |
424 | assert(p); | |
425 | ||
426 | old_state = p->state; | |
427 | p->state = state; | |
428 | ||
672028dc LP |
429 | if (state != PATH_WAITING && |
430 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
431 | path_unwatch(p); |
432 | ||
433 | if (state != old_state) | |
434 | log_debug("%s changed %s -> %s", | |
1124fe6f | 435 | UNIT(p)->id, |
01f78473 LP |
436 | path_state_to_string(old_state), |
437 | path_state_to_string(state)); | |
438 | ||
e2f3b44c | 439 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
440 | } |
441 | ||
ac3f50ca | 442 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 LP |
443 | |
444 | static int path_coldplug(Unit *u) { | |
445 | Path *p = PATH(u); | |
446 | ||
447 | assert(p); | |
448 | assert(p->state == PATH_DEAD); | |
449 | ||
450 | if (p->deserialized_state != p->state) { | |
451 | ||
452 | if (p->deserialized_state == PATH_WAITING || | |
453 | p->deserialized_state == PATH_RUNNING) | |
ac3f50ca | 454 | path_enter_waiting(p, true, true); |
01f78473 LP |
455 | else |
456 | path_set_state(p, p->deserialized_state); | |
457 | } | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
cd43ca73 | 462 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
463 | assert(p); |
464 | ||
cd43ca73 LP |
465 | if (f != PATH_SUCCESS) |
466 | p->result = f; | |
01f78473 | 467 | |
cd43ca73 | 468 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
469 | } |
470 | ||
471 | static void path_enter_running(Path *p) { | |
472 | int r; | |
398ef8ba LP |
473 | DBusError error; |
474 | ||
01f78473 | 475 | assert(p); |
398ef8ba | 476 | dbus_error_init(&error); |
01f78473 | 477 | |
ba3e67a7 | 478 | /* Don't start job if we are supposed to go down */ |
1124fe6f | 479 | if (UNIT(p)->job && UNIT(p)->job->type == JOB_STOP) |
ba3e67a7 LP |
480 | return; |
481 | ||
1124fe6f | 482 | if ((r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_DEREF(p->unit), JOB_REPLACE, true, &error, NULL)) < 0) |
01f78473 LP |
483 | goto fail; |
484 | ||
672028dc LP |
485 | p->inotify_triggered = false; |
486 | ||
487 | if ((r = path_watch(p)) < 0) | |
488 | goto fail; | |
489 | ||
01f78473 LP |
490 | path_set_state(p, PATH_RUNNING); |
491 | return; | |
492 | ||
493 | fail: | |
1124fe6f | 494 | log_warning("%s failed to queue unit startup job: %s", UNIT(p)->id, bus_error(&error, r)); |
cd43ca73 | 495 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
398ef8ba LP |
496 | |
497 | dbus_error_free(&error); | |
01f78473 LP |
498 | } |
499 | ||
ac3f50ca | 500 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 501 | PathSpec *s; |
01f78473 LP |
502 | bool good = false; |
503 | ||
ac3f50ca | 504 | assert(p); |
672028dc | 505 | |
01f78473 | 506 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 507 | good = path_spec_check_good(s, initial); |
01f78473 LP |
508 | |
509 | if (good) | |
510 | break; | |
511 | } | |
512 | ||
ac3f50ca LP |
513 | return good; |
514 | } | |
01f78473 | 515 | |
ac3f50ca LP |
516 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
517 | int r; | |
0595f9a1 | 518 | |
ac3f50ca LP |
519 | if (recheck) |
520 | if (path_check_good(p, initial)) { | |
1124fe6f | 521 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
522 | path_enter_running(p); |
523 | return; | |
524 | } | |
525 | ||
526 | if ((r = path_watch(p)) < 0) | |
527 | goto fail; | |
528 | ||
529 | /* Hmm, so now we have created inotify watches, but the file | |
530 | * might have appeared/been removed by now, so we must | |
531 | * recheck */ | |
532 | ||
533 | if (recheck) | |
534 | if (path_check_good(p, false)) { | |
1124fe6f | 535 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
536 | path_enter_running(p); |
537 | return; | |
538 | } | |
01f78473 LP |
539 | |
540 | path_set_state(p, PATH_WAITING); | |
541 | return; | |
542 | ||
543 | fail: | |
1124fe6f | 544 | log_warning("%s failed to enter waiting state: %s", UNIT(p)->id, strerror(-r)); |
cd43ca73 | 545 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
546 | } |
547 | ||
0e456f97 LP |
548 | static void path_mkdir(Path *p) { |
549 | PathSpec *s; | |
550 | ||
551 | assert(p); | |
552 | ||
553 | if (!p->make_directory) | |
554 | return; | |
555 | ||
4b562198 | 556 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 557 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
558 | } |
559 | ||
01f78473 LP |
560 | static int path_start(Unit *u) { |
561 | Path *p = PATH(u); | |
562 | ||
563 | assert(p); | |
fdf20a31 | 564 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 565 | |
ac155bb8 | 566 | if (UNIT_DEREF(p->unit)->load_state != UNIT_LOADED) |
01f78473 LP |
567 | return -ENOENT; |
568 | ||
0e456f97 LP |
569 | path_mkdir(p); |
570 | ||
cd43ca73 | 571 | p->result = PATH_SUCCESS; |
ac3f50ca | 572 | path_enter_waiting(p, true, true); |
00dc5d76 | 573 | |
01f78473 LP |
574 | return 0; |
575 | } | |
576 | ||
577 | static int path_stop(Unit *u) { | |
578 | Path *p = PATH(u); | |
579 | ||
580 | assert(p); | |
581 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
582 | ||
cd43ca73 | 583 | path_enter_dead(p, PATH_SUCCESS); |
01f78473 LP |
584 | return 0; |
585 | } | |
586 | ||
587 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
588 | Path *p = PATH(u); | |
589 | ||
590 | assert(u); | |
591 | assert(f); | |
592 | assert(fds); | |
593 | ||
594 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 595 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
596 | |
597 | return 0; | |
598 | } | |
599 | ||
600 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
601 | Path *p = PATH(u); | |
602 | ||
603 | assert(u); | |
604 | assert(key); | |
605 | assert(value); | |
606 | assert(fds); | |
607 | ||
608 | if (streq(key, "state")) { | |
609 | PathState state; | |
610 | ||
611 | if ((state = path_state_from_string(value)) < 0) | |
612 | log_debug("Failed to parse state value %s", value); | |
613 | else | |
614 | p->deserialized_state = state; | |
cd43ca73 LP |
615 | |
616 | } else if (streq(key, "result")) { | |
617 | PathResult f; | |
618 | ||
619 | f = path_result_from_string(value); | |
620 | if (f < 0) | |
621 | log_debug("Failed to parse result value %s", value); | |
622 | else if (f != PATH_SUCCESS) | |
623 | p->result = f; | |
624 | ||
01f78473 LP |
625 | } else |
626 | log_debug("Unknown serialization key '%s'", key); | |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
631 | static UnitActiveState path_active_state(Unit *u) { | |
632 | assert(u); | |
633 | ||
634 | return state_translation_table[PATH(u)->state]; | |
635 | } | |
636 | ||
637 | static const char *path_sub_state_to_string(Unit *u) { | |
638 | assert(u); | |
639 | ||
640 | return path_state_to_string(PATH(u)->state); | |
641 | } | |
642 | ||
643 | static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { | |
644 | Path *p = PATH(u); | |
01f78473 | 645 | PathSpec *s; |
4b562198 | 646 | int changed; |
01f78473 LP |
647 | |
648 | assert(p); | |
649 | assert(fd >= 0); | |
650 | ||
672028dc LP |
651 | if (p->state != PATH_WAITING && |
652 | p->state != PATH_RUNNING) | |
01f78473 LP |
653 | return; |
654 | ||
ac155bb8 | 655 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 656 | |
01f78473 | 657 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 658 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
659 | break; |
660 | ||
661 | if (!s) { | |
662 | log_error("Got event on unknown fd."); | |
663 | goto fail; | |
664 | } | |
665 | ||
57020a3a | 666 | changed = path_spec_fd_event(s, events); |
4b562198 | 667 | if (changed < 0) |
01f78473 | 668 | goto fail; |
01f78473 | 669 | |
672028dc LP |
670 | /* If we are already running, then remember that one event was |
671 | * dispatched so that we restart the service only if something | |
672 | * actually changed on disk */ | |
673 | p->inotify_triggered = true; | |
674 | ||
672028dc LP |
675 | if (changed) |
676 | path_enter_running(p); | |
677 | else | |
ac3f50ca | 678 | path_enter_waiting(p, false, true); |
672028dc | 679 | |
01f78473 LP |
680 | return; |
681 | ||
682 | fail: | |
cd43ca73 | 683 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
684 | } |
685 | ||
686 | void path_unit_notify(Unit *u, UnitActiveState new_state) { | |
01f78473 | 687 | Iterator i; |
57020a3a | 688 | Unit *k; |
01f78473 | 689 | |
ac155bb8 | 690 | if (u->type == UNIT_PATH) |
01f78473 LP |
691 | return; |
692 | ||
ac155bb8 | 693 | SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) { |
01f78473 LP |
694 | Path *p; |
695 | ||
ac155bb8 | 696 | if (k->type != UNIT_PATH) |
01f78473 LP |
697 | continue; |
698 | ||
ac155bb8 | 699 | if (k->load_state != UNIT_LOADED) |
01f78473 LP |
700 | continue; |
701 | ||
57020a3a | 702 | p = PATH(k); |
01f78473 LP |
703 | |
704 | if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) { | |
1124fe6f | 705 | log_debug("%s got notified about unit deactivation.", UNIT(p)->id); |
672028dc LP |
706 | |
707 | /* Hmm, so inotify was triggered since the | |
708 | * last activation, so I guess we need to | |
709 | * recheck what is going on. */ | |
ac3f50ca | 710 | path_enter_waiting(p, false, p->inotify_triggered); |
01f78473 LP |
711 | } |
712 | } | |
01f78473 LP |
713 | } |
714 | ||
fdf20a31 | 715 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
716 | Path *p = PATH(u); |
717 | ||
718 | assert(p); | |
719 | ||
fdf20a31 | 720 | if (p->state == PATH_FAILED) |
5632e374 LP |
721 | path_set_state(p, PATH_DEAD); |
722 | ||
cd43ca73 | 723 | p->result = PATH_SUCCESS; |
5632e374 LP |
724 | } |
725 | ||
01f78473 LP |
726 | static const char* const path_state_table[_PATH_STATE_MAX] = { |
727 | [PATH_DEAD] = "dead", | |
728 | [PATH_WAITING] = "waiting", | |
729 | [PATH_RUNNING] = "running", | |
fdf20a31 | 730 | [PATH_FAILED] = "failed" |
01f78473 LP |
731 | }; |
732 | ||
733 | DEFINE_STRING_TABLE_LOOKUP(path_state, PathState); | |
734 | ||
735 | static const char* const path_type_table[_PATH_TYPE_MAX] = { | |
736 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 737 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
01f78473 | 738 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 739 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
740 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty" |
741 | }; | |
742 | ||
743 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
744 | ||
cd43ca73 LP |
745 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
746 | [PATH_SUCCESS] = "success", | |
747 | [PATH_FAILURE_RESOURCES] = "resources" | |
748 | }; | |
749 | ||
750 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
751 | ||
01f78473 | 752 | const UnitVTable path_vtable = { |
7d17cfbc | 753 | .object_size = sizeof(Path), |
f975e971 LP |
754 | .sections = |
755 | "Unit\0" | |
756 | "Path\0" | |
757 | "Install\0", | |
01f78473 | 758 | |
0e456f97 | 759 | .init = path_init, |
01f78473 LP |
760 | .done = path_done, |
761 | .load = path_load, | |
762 | ||
763 | .coldplug = path_coldplug, | |
764 | ||
765 | .dump = path_dump, | |
766 | ||
767 | .start = path_start, | |
768 | .stop = path_stop, | |
769 | ||
770 | .serialize = path_serialize, | |
771 | .deserialize_item = path_deserialize_item, | |
772 | ||
773 | .active_state = path_active_state, | |
774 | .sub_state_to_string = path_sub_state_to_string, | |
775 | ||
776 | .fd_event = path_fd_event, | |
777 | ||
fdf20a31 | 778 | .reset_failed = path_reset_failed, |
5632e374 | 779 | |
c4e2ceae | 780 | .bus_interface = "org.freedesktop.systemd1.Path", |
cd43ca73 LP |
781 | .bus_message_handler = bus_path_message_handler, |
782 | .bus_invalidating_properties = bus_path_invalidating_properties | |
01f78473 | 783 | }; |