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