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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 | ||
01f78473 LP |
251 | static void path_done(Unit *u) { |
252 | Path *p = PATH(u); | |
253 | PathSpec *s; | |
254 | ||
255 | assert(p); | |
256 | ||
57020a3a LP |
257 | unit_ref_unset(&p->unit); |
258 | ||
01f78473 | 259 | while ((s = p->specs)) { |
57020a3a | 260 | path_spec_unwatch(s, u); |
01f78473 | 261 | LIST_REMOVE(PathSpec, spec, p->specs, s); |
57020a3a | 262 | path_spec_done(s); |
01f78473 LP |
263 | free(s); |
264 | } | |
265 | } | |
266 | ||
267 | int path_add_one_mount_link(Path *p, Mount *m) { | |
268 | PathSpec *s; | |
269 | int r; | |
270 | ||
271 | assert(p); | |
272 | assert(m); | |
273 | ||
1124fe6f MS |
274 | if (UNIT(p)->load_state != UNIT_LOADED || |
275 | UNIT(m)->load_state != UNIT_LOADED) | |
01f78473 LP |
276 | return 0; |
277 | ||
278 | LIST_FOREACH(spec, s, p->specs) { | |
279 | ||
57020a3a | 280 | if (!path_spec_startswith(s, m->where)) |
01f78473 LP |
281 | continue; |
282 | ||
2c966c03 | 283 | if ((r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
01f78473 LP |
284 | return r; |
285 | } | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | static int path_add_mount_links(Path *p) { | |
ac155bb8 | 291 | Unit *other; |
01f78473 LP |
292 | int r; |
293 | ||
294 | assert(p); | |
295 | ||
1124fe6f | 296 | LIST_FOREACH(units_by_type, other, UNIT(p)->manager->units_by_type[UNIT_MOUNT]) |
595ed347 | 297 | if ((r = path_add_one_mount_link(p, MOUNT(other))) < 0) |
01f78473 LP |
298 | return r; |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static int path_verify(Path *p) { | |
304 | assert(p); | |
305 | ||
1124fe6f | 306 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
307 | return 0; |
308 | ||
309 | if (!p->specs) { | |
1124fe6f | 310 | log_error("%s lacks path setting. Refusing.", UNIT(p)->id); |
01f78473 LP |
311 | return -EINVAL; |
312 | } | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
6c155fe3 LP |
317 | static int path_add_default_dependencies(Path *p) { |
318 | int r; | |
319 | ||
320 | assert(p); | |
321 | ||
67445f4e | 322 | if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) { |
2a77d31d LP |
323 | if ((r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0) |
324 | return r; | |
325 | ||
6c155fe3 LP |
326 | if ((r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0) |
327 | return r; | |
2a77d31d | 328 | } |
6c155fe3 | 329 | |
ead8e478 | 330 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); |
6c155fe3 LP |
331 | } |
332 | ||
01f78473 LP |
333 | static int path_load(Unit *u) { |
334 | Path *p = PATH(u); | |
335 | int r; | |
336 | ||
337 | assert(u); | |
ac155bb8 | 338 | assert(u->load_state == UNIT_STUB); |
01f78473 LP |
339 | |
340 | if ((r = unit_load_fragment_and_dropin(u)) < 0) | |
341 | return r; | |
342 | ||
ac155bb8 | 343 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 344 | |
57020a3a LP |
345 | if (!UNIT_DEREF(p->unit)) { |
346 | Unit *x; | |
347 | ||
348 | r = unit_load_related_unit(u, ".service", &x); | |
349 | if (r < 0) | |
01f78473 LP |
350 | return r; |
351 | ||
57020a3a LP |
352 | unit_ref_set(&p->unit, x); |
353 | } | |
354 | ||
355 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(p->unit), true); | |
356 | if (r < 0) | |
01f78473 LP |
357 | return r; |
358 | ||
359 | if ((r = path_add_mount_links(p)) < 0) | |
360 | return r; | |
a40eb732 | 361 | |
1124fe6f | 362 | if (UNIT(p)->default_dependencies) |
6c155fe3 | 363 | if ((r = path_add_default_dependencies(p)) < 0) |
a40eb732 | 364 | return r; |
01f78473 LP |
365 | } |
366 | ||
367 | return path_verify(p); | |
368 | } | |
369 | ||
370 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
371 | Path *p = PATH(u); | |
01f78473 LP |
372 | PathSpec *s; |
373 | ||
e364ad06 LP |
374 | assert(p); |
375 | assert(f); | |
01f78473 LP |
376 | |
377 | fprintf(f, | |
378 | "%sPath State: %s\n" | |
cd43ca73 | 379 | "%sResult: %s\n" |
0e456f97 LP |
380 | "%sUnit: %s\n" |
381 | "%sMakeDirectory: %s\n" | |
382 | "%sDirectoryMode: %04o\n", | |
01f78473 | 383 | prefix, path_state_to_string(p->state), |
cd43ca73 | 384 | prefix, path_result_to_string(p->result), |
ac155bb8 | 385 | prefix, UNIT_DEREF(p->unit)->id, |
0e456f97 LP |
386 | prefix, yes_no(p->make_directory), |
387 | prefix, p->directory_mode); | |
01f78473 LP |
388 | |
389 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 390 | path_spec_dump(s, f, prefix); |
01f78473 LP |
391 | } |
392 | ||
393 | static void path_unwatch(Path *p) { | |
394 | PathSpec *s; | |
395 | ||
396 | assert(p); | |
397 | ||
398 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 399 | path_spec_unwatch(s, UNIT(p)); |
01f78473 LP |
400 | } |
401 | ||
402 | static int path_watch(Path *p) { | |
403 | int r; | |
404 | PathSpec *s; | |
405 | ||
406 | assert(p); | |
407 | ||
408 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 409 | if ((r = path_spec_watch(s, UNIT(p))) < 0) |
01f78473 LP |
410 | return r; |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | static void path_set_state(Path *p, PathState state) { | |
416 | PathState old_state; | |
417 | assert(p); | |
418 | ||
419 | old_state = p->state; | |
420 | p->state = state; | |
421 | ||
672028dc LP |
422 | if (state != PATH_WAITING && |
423 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
424 | path_unwatch(p); |
425 | ||
426 | if (state != old_state) | |
427 | log_debug("%s changed %s -> %s", | |
1124fe6f | 428 | UNIT(p)->id, |
01f78473 LP |
429 | path_state_to_string(old_state), |
430 | path_state_to_string(state)); | |
431 | ||
e2f3b44c | 432 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
433 | } |
434 | ||
ac3f50ca | 435 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 LP |
436 | |
437 | static int path_coldplug(Unit *u) { | |
438 | Path *p = PATH(u); | |
439 | ||
440 | assert(p); | |
441 | assert(p->state == PATH_DEAD); | |
442 | ||
443 | if (p->deserialized_state != p->state) { | |
444 | ||
445 | if (p->deserialized_state == PATH_WAITING || | |
446 | p->deserialized_state == PATH_RUNNING) | |
ac3f50ca | 447 | path_enter_waiting(p, true, true); |
01f78473 LP |
448 | else |
449 | path_set_state(p, p->deserialized_state); | |
450 | } | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
cd43ca73 | 455 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
456 | assert(p); |
457 | ||
cd43ca73 LP |
458 | if (f != PATH_SUCCESS) |
459 | p->result = f; | |
01f78473 | 460 | |
cd43ca73 | 461 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
462 | } |
463 | ||
464 | static void path_enter_running(Path *p) { | |
465 | int r; | |
398ef8ba LP |
466 | DBusError error; |
467 | ||
01f78473 | 468 | assert(p); |
398ef8ba | 469 | dbus_error_init(&error); |
01f78473 | 470 | |
ba3e67a7 | 471 | /* Don't start job if we are supposed to go down */ |
1124fe6f | 472 | if (UNIT(p)->job && UNIT(p)->job->type == JOB_STOP) |
ba3e67a7 LP |
473 | return; |
474 | ||
1124fe6f | 475 | if ((r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_DEREF(p->unit), JOB_REPLACE, true, &error, NULL)) < 0) |
01f78473 LP |
476 | goto fail; |
477 | ||
672028dc LP |
478 | p->inotify_triggered = false; |
479 | ||
480 | if ((r = path_watch(p)) < 0) | |
481 | goto fail; | |
482 | ||
01f78473 LP |
483 | path_set_state(p, PATH_RUNNING); |
484 | return; | |
485 | ||
486 | fail: | |
1124fe6f | 487 | log_warning("%s failed to queue unit startup job: %s", UNIT(p)->id, bus_error(&error, r)); |
cd43ca73 | 488 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
398ef8ba LP |
489 | |
490 | dbus_error_free(&error); | |
01f78473 LP |
491 | } |
492 | ||
ac3f50ca | 493 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 494 | PathSpec *s; |
01f78473 LP |
495 | bool good = false; |
496 | ||
ac3f50ca | 497 | assert(p); |
672028dc | 498 | |
01f78473 | 499 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 500 | good = path_spec_check_good(s, initial); |
01f78473 LP |
501 | |
502 | if (good) | |
503 | break; | |
504 | } | |
505 | ||
ac3f50ca LP |
506 | return good; |
507 | } | |
01f78473 | 508 | |
ac3f50ca LP |
509 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
510 | int r; | |
0595f9a1 | 511 | |
ac3f50ca LP |
512 | if (recheck) |
513 | if (path_check_good(p, initial)) { | |
1124fe6f | 514 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
515 | path_enter_running(p); |
516 | return; | |
517 | } | |
518 | ||
519 | if ((r = path_watch(p)) < 0) | |
520 | goto fail; | |
521 | ||
522 | /* Hmm, so now we have created inotify watches, but the file | |
523 | * might have appeared/been removed by now, so we must | |
524 | * recheck */ | |
525 | ||
526 | if (recheck) | |
527 | if (path_check_good(p, false)) { | |
1124fe6f | 528 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
529 | path_enter_running(p); |
530 | return; | |
531 | } | |
01f78473 LP |
532 | |
533 | path_set_state(p, PATH_WAITING); | |
534 | return; | |
535 | ||
536 | fail: | |
1124fe6f | 537 | log_warning("%s failed to enter waiting state: %s", UNIT(p)->id, strerror(-r)); |
cd43ca73 | 538 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
539 | } |
540 | ||
0e456f97 LP |
541 | static void path_mkdir(Path *p) { |
542 | PathSpec *s; | |
543 | ||
544 | assert(p); | |
545 | ||
546 | if (!p->make_directory) | |
547 | return; | |
548 | ||
4b562198 | 549 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 550 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
551 | } |
552 | ||
01f78473 LP |
553 | static int path_start(Unit *u) { |
554 | Path *p = PATH(u); | |
555 | ||
556 | assert(p); | |
fdf20a31 | 557 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 558 | |
ac155bb8 | 559 | if (UNIT_DEREF(p->unit)->load_state != UNIT_LOADED) |
01f78473 LP |
560 | return -ENOENT; |
561 | ||
0e456f97 LP |
562 | path_mkdir(p); |
563 | ||
cd43ca73 | 564 | p->result = PATH_SUCCESS; |
ac3f50ca | 565 | path_enter_waiting(p, true, true); |
00dc5d76 | 566 | |
01f78473 LP |
567 | return 0; |
568 | } | |
569 | ||
570 | static int path_stop(Unit *u) { | |
571 | Path *p = PATH(u); | |
572 | ||
573 | assert(p); | |
574 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
575 | ||
cd43ca73 | 576 | path_enter_dead(p, PATH_SUCCESS); |
01f78473 LP |
577 | return 0; |
578 | } | |
579 | ||
580 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
581 | Path *p = PATH(u); | |
582 | ||
583 | assert(u); | |
584 | assert(f); | |
585 | assert(fds); | |
586 | ||
587 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 588 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
589 | |
590 | return 0; | |
591 | } | |
592 | ||
593 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
594 | Path *p = PATH(u); | |
595 | ||
596 | assert(u); | |
597 | assert(key); | |
598 | assert(value); | |
599 | assert(fds); | |
600 | ||
601 | if (streq(key, "state")) { | |
602 | PathState state; | |
603 | ||
604 | if ((state = path_state_from_string(value)) < 0) | |
605 | log_debug("Failed to parse state value %s", value); | |
606 | else | |
607 | p->deserialized_state = state; | |
cd43ca73 LP |
608 | |
609 | } else if (streq(key, "result")) { | |
610 | PathResult f; | |
611 | ||
612 | f = path_result_from_string(value); | |
613 | if (f < 0) | |
614 | log_debug("Failed to parse result value %s", value); | |
615 | else if (f != PATH_SUCCESS) | |
616 | p->result = f; | |
617 | ||
01f78473 LP |
618 | } else |
619 | log_debug("Unknown serialization key '%s'", key); | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | static UnitActiveState path_active_state(Unit *u) { | |
625 | assert(u); | |
626 | ||
627 | return state_translation_table[PATH(u)->state]; | |
628 | } | |
629 | ||
630 | static const char *path_sub_state_to_string(Unit *u) { | |
631 | assert(u); | |
632 | ||
633 | return path_state_to_string(PATH(u)->state); | |
634 | } | |
635 | ||
636 | static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { | |
637 | Path *p = PATH(u); | |
01f78473 | 638 | PathSpec *s; |
4b562198 | 639 | int changed; |
01f78473 LP |
640 | |
641 | assert(p); | |
642 | assert(fd >= 0); | |
643 | ||
672028dc LP |
644 | if (p->state != PATH_WAITING && |
645 | p->state != PATH_RUNNING) | |
01f78473 LP |
646 | return; |
647 | ||
ac155bb8 | 648 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 649 | |
01f78473 | 650 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 651 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
652 | break; |
653 | ||
654 | if (!s) { | |
655 | log_error("Got event on unknown fd."); | |
656 | goto fail; | |
657 | } | |
658 | ||
57020a3a | 659 | changed = path_spec_fd_event(s, events); |
4b562198 | 660 | if (changed < 0) |
01f78473 | 661 | goto fail; |
01f78473 | 662 | |
672028dc LP |
663 | /* If we are already running, then remember that one event was |
664 | * dispatched so that we restart the service only if something | |
665 | * actually changed on disk */ | |
666 | p->inotify_triggered = true; | |
667 | ||
672028dc LP |
668 | if (changed) |
669 | path_enter_running(p); | |
670 | else | |
ac3f50ca | 671 | path_enter_waiting(p, false, true); |
672028dc | 672 | |
01f78473 LP |
673 | return; |
674 | ||
675 | fail: | |
cd43ca73 | 676 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
677 | } |
678 | ||
679 | void path_unit_notify(Unit *u, UnitActiveState new_state) { | |
01f78473 | 680 | Iterator i; |
57020a3a | 681 | Unit *k; |
01f78473 | 682 | |
ac155bb8 | 683 | if (u->type == UNIT_PATH) |
01f78473 LP |
684 | return; |
685 | ||
ac155bb8 | 686 | SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) { |
01f78473 LP |
687 | Path *p; |
688 | ||
ac155bb8 | 689 | if (k->type != UNIT_PATH) |
01f78473 LP |
690 | continue; |
691 | ||
ac155bb8 | 692 | if (k->load_state != UNIT_LOADED) |
01f78473 LP |
693 | continue; |
694 | ||
57020a3a | 695 | p = PATH(k); |
01f78473 LP |
696 | |
697 | if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) { | |
1124fe6f | 698 | log_debug("%s got notified about unit deactivation.", UNIT(p)->id); |
672028dc LP |
699 | |
700 | /* Hmm, so inotify was triggered since the | |
701 | * last activation, so I guess we need to | |
702 | * recheck what is going on. */ | |
ac3f50ca | 703 | path_enter_waiting(p, false, p->inotify_triggered); |
01f78473 LP |
704 | } |
705 | } | |
01f78473 LP |
706 | } |
707 | ||
fdf20a31 | 708 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
709 | Path *p = PATH(u); |
710 | ||
711 | assert(p); | |
712 | ||
fdf20a31 | 713 | if (p->state == PATH_FAILED) |
5632e374 LP |
714 | path_set_state(p, PATH_DEAD); |
715 | ||
cd43ca73 | 716 | p->result = PATH_SUCCESS; |
5632e374 LP |
717 | } |
718 | ||
01f78473 LP |
719 | static const char* const path_state_table[_PATH_STATE_MAX] = { |
720 | [PATH_DEAD] = "dead", | |
721 | [PATH_WAITING] = "waiting", | |
722 | [PATH_RUNNING] = "running", | |
fdf20a31 | 723 | [PATH_FAILED] = "failed" |
01f78473 LP |
724 | }; |
725 | ||
726 | DEFINE_STRING_TABLE_LOOKUP(path_state, PathState); | |
727 | ||
728 | static const char* const path_type_table[_PATH_TYPE_MAX] = { | |
729 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 730 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
01f78473 | 731 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 732 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
733 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty" |
734 | }; | |
735 | ||
736 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
737 | ||
cd43ca73 LP |
738 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
739 | [PATH_SUCCESS] = "success", | |
740 | [PATH_FAILURE_RESOURCES] = "resources" | |
741 | }; | |
742 | ||
743 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
744 | ||
01f78473 | 745 | const UnitVTable path_vtable = { |
7d17cfbc | 746 | .object_size = sizeof(Path), |
f975e971 LP |
747 | .sections = |
748 | "Unit\0" | |
749 | "Path\0" | |
750 | "Install\0", | |
01f78473 | 751 | |
0e456f97 | 752 | .init = path_init, |
01f78473 LP |
753 | .done = path_done, |
754 | .load = path_load, | |
755 | ||
756 | .coldplug = path_coldplug, | |
757 | ||
758 | .dump = path_dump, | |
759 | ||
760 | .start = path_start, | |
761 | .stop = path_stop, | |
762 | ||
763 | .serialize = path_serialize, | |
764 | .deserialize_item = path_deserialize_item, | |
765 | ||
766 | .active_state = path_active_state, | |
767 | .sub_state_to_string = path_sub_state_to_string, | |
768 | ||
769 | .fd_event = path_fd_event, | |
770 | ||
fdf20a31 | 771 | .reset_failed = path_reset_failed, |
5632e374 | 772 | |
c4e2ceae | 773 | .bus_interface = "org.freedesktop.systemd1.Path", |
cd43ca73 LP |
774 | .bus_message_handler = bus_path_message_handler, |
775 | .bus_invalidating_properties = bus_path_invalidating_properties | |
01f78473 | 776 | }; |