]>
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" |
9eb977db | 34 | #include "path-util.h" |
f8c16f42 | 35 | #include "macro.h" |
718db961 LP |
36 | #include "bus-util.h" |
37 | #include "bus-error.h" | |
01f78473 LP |
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, | |
fdf20a31 | 43 | [PATH_FAILED] = UNIT_FAILED |
01f78473 LP |
44 | }; |
45 | ||
718db961 LP |
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) { | |
57020a3a | 49 | |
4b562198 MS |
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, | |
e9223856 | 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, |
4b562198 MS |
55 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO |
56 | }; | |
57 | ||
58 | bool exists = false; | |
bc41f93e | 59 | char *slash, *oldslash = NULL; |
4b562198 | 60 | int r; |
0e456f97 | 61 | |
4b562198 | 62 | assert(s); |
718db961 LP |
63 | assert(s->unit); |
64 | assert(handler); | |
0e456f97 | 65 | |
718db961 | 66 | path_spec_unwatch(s); |
4b562198 | 67 | |
f8c16f42 ZJS |
68 | s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
69 | if (s->inotify_fd < 0) { | |
4b562198 MS |
70 | r = -errno; |
71 | goto fail; | |
72 | } | |
73 | ||
151b9b96 | 74 | r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s); |
f8c16f42 | 75 | if (r < 0) |
4b562198 | 76 | goto fail; |
4b562198 | 77 | |
bc41f93e | 78 | /* This assumes the path was passed through path_kill_slashes()! */ |
4b562198 | 79 | |
180d6802 MS |
80 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { |
81 | char *cut = NULL; | |
4b562198 | 82 | int flags; |
bc41f93e ZJS |
83 | char tmp; |
84 | ||
85 | if (slash) { | |
180d6802 MS |
86 | cut = slash + (slash == s->path); |
87 | tmp = *cut; | |
88 | *cut = '\0'; | |
89 | ||
bc41f93e | 90 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; |
180d6802 | 91 | } else |
bc41f93e | 92 | flags = flags_table[s->type]; |
4b562198 | 93 | |
180d6802 | 94 | r = inotify_add_watch(s->inotify_fd, s->path, flags); |
bc41f93e | 95 | if (r < 0) { |
180d6802 MS |
96 | if (errno == EACCES || errno == ENOENT) { |
97 | if (cut) | |
98 | *cut = tmp; | |
bc41f93e | 99 | break; |
180d6802 | 100 | } |
4b562198 | 101 | |
18abe7bd ZJS |
102 | log_warning("Failed to add watch on %s: %s", s->path, |
103 | errno == ENOSPC ? "too many watches" : strerror(-r)); | |
28a79bd2 | 104 | r = -errno; |
180d6802 MS |
105 | if (cut) |
106 | *cut = tmp; | |
28a79bd2 | 107 | goto fail; |
bc41f93e ZJS |
108 | } else { |
109 | exists = true; | |
110 | ||
111 | /* Path exists, we don't need to watch parent | |
112 | too closely. */ | |
113 | if (oldslash) { | |
180d6802 MS |
114 | char *cut2 = oldslash + (oldslash == s->path); |
115 | char tmp2 = *cut2; | |
116 | *cut2 = '\0'; | |
bc41f93e | 117 | |
180d6802 | 118 | inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); |
bc41f93e ZJS |
119 | /* Error is ignored, the worst can happen is |
120 | we get spurious events. */ | |
121 | ||
180d6802 | 122 | *cut2 = tmp2; |
bc41f93e | 123 | } |
28a79bd2 | 124 | } |
bc41f93e | 125 | |
180d6802 MS |
126 | if (cut) |
127 | *cut = tmp; | |
128 | ||
129 | if (slash) | |
bc41f93e | 130 | oldslash = slash; |
180d6802 | 131 | else { |
bc41f93e ZJS |
132 | /* whole path has been iterated over */ |
133 | s->primary_wd = r; | |
134 | break; | |
135 | } | |
136 | } | |
137 | ||
28a79bd2 | 138 | if (!exists) { |
56f64d95 | 139 | log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", |
28a79bd2 | 140 | s->path); |
bc41f93e | 141 | r = -errno; /* either EACCESS or ENOENT */ |
28a79bd2 ZJS |
142 | goto fail; |
143 | } | |
144 | ||
4b562198 MS |
145 | return 0; |
146 | ||
147 | fail: | |
718db961 | 148 | path_spec_unwatch(s); |
4b562198 | 149 | return r; |
0e456f97 LP |
150 | } |
151 | ||
718db961 LP |
152 | void path_spec_unwatch(PathSpec *s) { |
153 | assert(s); | |
62347bc2 | 154 | |
718db961 | 155 | s->event_source = sd_event_source_unref(s->event_source); |
03e334a1 | 156 | s->inotify_fd = safe_close(s->inotify_fd); |
62347bc2 LP |
157 | } |
158 | ||
718db961 | 159 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { |
7fd1b19b | 160 | _cleanup_free_ uint8_t *buf = NULL; |
4b562198 MS |
161 | struct inotify_event *e; |
162 | ssize_t k; | |
163 | int l; | |
164 | int r = 0; | |
165 | ||
718db961 | 166 | if (revents != EPOLLIN) { |
15f55e80 | 167 | log_error("Got invalid poll event on inotify."); |
a163db44 | 168 | return -EINVAL; |
4b562198 MS |
169 | } |
170 | ||
4a62c710 MS |
171 | if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) |
172 | return log_error_errno(errno, "FIONREAD failed: %m"); | |
4b562198 MS |
173 | |
174 | assert(l > 0); | |
175 | ||
15f55e80 | 176 | buf = malloc(l); |
a163db44 ZJS |
177 | if (!buf) |
178 | return log_oom(); | |
4b562198 | 179 | |
15f55e80 | 180 | k = read(s->inotify_fd, buf, l); |
4a62c710 MS |
181 | if (k < 0) |
182 | return log_error_errno(errno, "Failed to read inotify event: %m"); | |
4b562198 MS |
183 | |
184 | e = (struct inotify_event*) buf; | |
185 | ||
186 | while (k > 0) { | |
187 | size_t step; | |
188 | ||
714d943f MS |
189 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && |
190 | s->primary_wd == e->wd) | |
4b562198 MS |
191 | r = 1; |
192 | ||
193 | step = sizeof(struct inotify_event) + e->len; | |
194 | assert(step <= (size_t) k); | |
195 | ||
196 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
197 | k -= step; | |
198 | } | |
a163db44 | 199 | |
4b562198 MS |
200 | return r; |
201 | } | |
202 | ||
57020a3a | 203 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
204 | bool good = false; |
205 | ||
206 | switch (s->type) { | |
207 | ||
208 | case PATH_EXISTS: | |
209 | good = access(s->path, F_OK) >= 0; | |
210 | break; | |
211 | ||
212 | case PATH_EXISTS_GLOB: | |
213 | good = glob_exists(s->path) > 0; | |
214 | break; | |
215 | ||
216 | case PATH_DIRECTORY_NOT_EMPTY: { | |
217 | int k; | |
218 | ||
219 | k = dir_is_empty(s->path); | |
220 | good = !(k == -ENOENT || k > 0); | |
221 | break; | |
222 | } | |
223 | ||
714d943f MS |
224 | case PATH_CHANGED: |
225 | case PATH_MODIFIED: { | |
4b562198 MS |
226 | bool b; |
227 | ||
228 | b = access(s->path, F_OK) >= 0; | |
229 | good = !initial && b != s->previous_exists; | |
230 | s->previous_exists = b; | |
231 | break; | |
232 | } | |
233 | ||
234 | default: | |
235 | ; | |
236 | } | |
237 | ||
238 | return good; | |
239 | } | |
240 | ||
57020a3a | 241 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
242 | int r; |
243 | ||
244 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
245 | return; | |
246 | ||
15f55e80 ZJS |
247 | r = mkdir_p_label(s->path, mode); |
248 | if (r < 0) | |
da927ba9 | 249 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
250 | } |
251 | ||
57020a3a | 252 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
253 | fprintf(f, |
254 | "%s%s: %s\n", | |
255 | prefix, | |
256 | path_type_to_string(s->type), | |
257 | s->path); | |
258 | } | |
259 | ||
57020a3a LP |
260 | void path_spec_done(PathSpec *s) { |
261 | assert(s); | |
4b562198 | 262 | assert(s->inotify_fd == -1); |
57020a3a | 263 | |
4b562198 MS |
264 | free(s->path); |
265 | } | |
266 | ||
267 | static void path_init(Unit *u) { | |
268 | Path *p = PATH(u); | |
269 | ||
270 | assert(u); | |
ac155bb8 | 271 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
272 | |
273 | p->directory_mode = 0755; | |
274 | } | |
275 | ||
74051b9b | 276 | void path_free_specs(Path *p) { |
01f78473 LP |
277 | PathSpec *s; |
278 | ||
279 | assert(p); | |
280 | ||
281 | while ((s = p->specs)) { | |
718db961 | 282 | path_spec_unwatch(s); |
71fda00f | 283 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 284 | path_spec_done(s); |
01f78473 LP |
285 | free(s); |
286 | } | |
287 | } | |
288 | ||
74051b9b LP |
289 | static void path_done(Unit *u) { |
290 | Path *p = PATH(u); | |
291 | ||
292 | assert(p); | |
293 | ||
74051b9b LP |
294 | path_free_specs(p); |
295 | } | |
296 | ||
a57f7e2c | 297 | static int path_add_mount_links(Path *p) { |
01f78473 LP |
298 | PathSpec *s; |
299 | int r; | |
300 | ||
301 | assert(p); | |
01f78473 LP |
302 | |
303 | LIST_FOREACH(spec, s, p->specs) { | |
a57f7e2c | 304 | r = unit_require_mounts_for(UNIT(p), s->path); |
e0207c8d | 305 | if (r < 0) |
01f78473 | 306 | return r; |
e0207c8d | 307 | } |
01f78473 LP |
308 | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static int path_verify(Path *p) { | |
313 | assert(p); | |
314 | ||
1124fe6f | 315 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
316 | return 0; |
317 | ||
318 | if (!p->specs) { | |
79008bdd | 319 | log_unit_error(UNIT(p)->id, |
66870f90 | 320 | "%s lacks path setting. Refusing.", UNIT(p)->id); |
01f78473 LP |
321 | return -EINVAL; |
322 | } | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
6c155fe3 LP |
327 | static int path_add_default_dependencies(Path *p) { |
328 | int r; | |
329 | ||
330 | assert(p); | |
331 | ||
e3d84721 LP |
332 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, |
333 | SPECIAL_PATHS_TARGET, NULL, true); | |
334 | if (r < 0) | |
335 | return r; | |
2a77d31d | 336 | |
e3d84721 | 337 | if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) { |
e0207c8d ZJS |
338 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, |
339 | SPECIAL_SYSINIT_TARGET, NULL, true); | |
340 | if (r < 0) | |
6c155fe3 | 341 | return r; |
2a77d31d | 342 | } |
6c155fe3 | 343 | |
e0207c8d ZJS |
344 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, |
345 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
6c155fe3 LP |
346 | } |
347 | ||
01f78473 LP |
348 | static int path_load(Unit *u) { |
349 | Path *p = PATH(u); | |
350 | int r; | |
351 | ||
352 | assert(u); | |
ac155bb8 | 353 | assert(u->load_state == UNIT_STUB); |
01f78473 | 354 | |
e0207c8d ZJS |
355 | r = unit_load_fragment_and_dropin(u); |
356 | if (r < 0) | |
01f78473 LP |
357 | return r; |
358 | ||
ac155bb8 | 359 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 360 | |
3ecaa09b | 361 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { |
57020a3a LP |
362 | Unit *x; |
363 | ||
364 | r = unit_load_related_unit(u, ".service", &x); | |
365 | if (r < 0) | |
01f78473 LP |
366 | return r; |
367 | ||
3ecaa09b LP |
368 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); |
369 | if (r < 0) | |
370 | return r; | |
57020a3a LP |
371 | } |
372 | ||
e0207c8d ZJS |
373 | r = path_add_mount_links(p); |
374 | if (r < 0) | |
01f78473 | 375 | return r; |
a40eb732 | 376 | |
e0207c8d ZJS |
377 | if (UNIT(p)->default_dependencies) { |
378 | r = path_add_default_dependencies(p); | |
379 | if (r < 0) | |
a40eb732 | 380 | return r; |
e0207c8d | 381 | } |
01f78473 LP |
382 | } |
383 | ||
384 | return path_verify(p); | |
385 | } | |
386 | ||
387 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
388 | Path *p = PATH(u); | |
3ecaa09b | 389 | Unit *trigger; |
01f78473 LP |
390 | PathSpec *s; |
391 | ||
e364ad06 LP |
392 | assert(p); |
393 | assert(f); | |
01f78473 | 394 | |
3ecaa09b LP |
395 | trigger = UNIT_TRIGGER(u); |
396 | ||
01f78473 LP |
397 | fprintf(f, |
398 | "%sPath State: %s\n" | |
cd43ca73 | 399 | "%sResult: %s\n" |
0e456f97 LP |
400 | "%sUnit: %s\n" |
401 | "%sMakeDirectory: %s\n" | |
402 | "%sDirectoryMode: %04o\n", | |
01f78473 | 403 | prefix, path_state_to_string(p->state), |
cd43ca73 | 404 | prefix, path_result_to_string(p->result), |
3ecaa09b | 405 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
406 | prefix, yes_no(p->make_directory), |
407 | prefix, p->directory_mode); | |
01f78473 LP |
408 | |
409 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 410 | path_spec_dump(s, f, prefix); |
01f78473 LP |
411 | } |
412 | ||
413 | static void path_unwatch(Path *p) { | |
414 | PathSpec *s; | |
415 | ||
416 | assert(p); | |
417 | ||
418 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 419 | path_spec_unwatch(s); |
01f78473 LP |
420 | } |
421 | ||
422 | static int path_watch(Path *p) { | |
423 | int r; | |
424 | PathSpec *s; | |
425 | ||
426 | assert(p); | |
427 | ||
e0207c8d | 428 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 429 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 430 | if (r < 0) |
01f78473 | 431 | return r; |
e0207c8d | 432 | } |
01f78473 LP |
433 | |
434 | return 0; | |
435 | } | |
436 | ||
437 | static void path_set_state(Path *p, PathState state) { | |
438 | PathState old_state; | |
439 | assert(p); | |
440 | ||
441 | old_state = p->state; | |
442 | p->state = state; | |
443 | ||
672028dc LP |
444 | if (state != PATH_WAITING && |
445 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
446 | path_unwatch(p); |
447 | ||
448 | if (state != old_state) | |
449 | log_debug("%s changed %s -> %s", | |
1124fe6f | 450 | UNIT(p)->id, |
01f78473 LP |
451 | path_state_to_string(old_state), |
452 | path_state_to_string(state)); | |
453 | ||
e2f3b44c | 454 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
455 | } |
456 | ||
ac3f50ca | 457 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 LP |
458 | |
459 | static int path_coldplug(Unit *u) { | |
460 | Path *p = PATH(u); | |
461 | ||
462 | assert(p); | |
463 | assert(p->state == PATH_DEAD); | |
464 | ||
465 | if (p->deserialized_state != p->state) { | |
466 | ||
467 | if (p->deserialized_state == PATH_WAITING || | |
468 | p->deserialized_state == PATH_RUNNING) | |
ac3f50ca | 469 | path_enter_waiting(p, true, true); |
01f78473 LP |
470 | else |
471 | path_set_state(p, p->deserialized_state); | |
472 | } | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
cd43ca73 | 477 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
478 | assert(p); |
479 | ||
cd43ca73 LP |
480 | if (f != PATH_SUCCESS) |
481 | p->result = f; | |
01f78473 | 482 | |
cd43ca73 | 483 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
484 | } |
485 | ||
486 | static void path_enter_running(Path *p) { | |
718db961 | 487 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
01f78473 | 488 | int r; |
398ef8ba | 489 | |
01f78473 | 490 | assert(p); |
3ecaa09b | 491 | |
ba3e67a7 | 492 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 493 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
494 | return; |
495 | ||
3ecaa09b | 496 | r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)), |
e0207c8d ZJS |
497 | JOB_REPLACE, true, &error, NULL); |
498 | if (r < 0) | |
01f78473 LP |
499 | goto fail; |
500 | ||
672028dc LP |
501 | p->inotify_triggered = false; |
502 | ||
e0207c8d ZJS |
503 | r = path_watch(p); |
504 | if (r < 0) | |
672028dc LP |
505 | goto fail; |
506 | ||
01f78473 LP |
507 | path_set_state(p, PATH_RUNNING); |
508 | return; | |
509 | ||
510 | fail: | |
e0207c8d | 511 | log_warning("%s failed to queue unit startup job: %s", |
718db961 | 512 | UNIT(p)->id, bus_error_message(&error, r)); |
cd43ca73 | 513 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
514 | } |
515 | ||
ac3f50ca | 516 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 517 | PathSpec *s; |
01f78473 LP |
518 | bool good = false; |
519 | ||
ac3f50ca | 520 | assert(p); |
672028dc | 521 | |
01f78473 | 522 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 523 | good = path_spec_check_good(s, initial); |
01f78473 LP |
524 | |
525 | if (good) | |
526 | break; | |
527 | } | |
528 | ||
ac3f50ca LP |
529 | return good; |
530 | } | |
01f78473 | 531 | |
ac3f50ca LP |
532 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
533 | int r; | |
0595f9a1 | 534 | |
ac3f50ca LP |
535 | if (recheck) |
536 | if (path_check_good(p, initial)) { | |
1124fe6f | 537 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
538 | path_enter_running(p); |
539 | return; | |
540 | } | |
541 | ||
e0207c8d ZJS |
542 | r = path_watch(p); |
543 | if (r < 0) | |
ac3f50ca LP |
544 | goto fail; |
545 | ||
546 | /* Hmm, so now we have created inotify watches, but the file | |
547 | * might have appeared/been removed by now, so we must | |
548 | * recheck */ | |
549 | ||
550 | if (recheck) | |
551 | if (path_check_good(p, false)) { | |
1124fe6f | 552 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
553 | path_enter_running(p); |
554 | return; | |
555 | } | |
01f78473 LP |
556 | |
557 | path_set_state(p, PATH_WAITING); | |
558 | return; | |
559 | ||
560 | fail: | |
c33b3297 | 561 | log_warning_errno(r, "%s failed to enter waiting state: %m", UNIT(p)->id); |
cd43ca73 | 562 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
563 | } |
564 | ||
0e456f97 LP |
565 | static void path_mkdir(Path *p) { |
566 | PathSpec *s; | |
567 | ||
568 | assert(p); | |
569 | ||
570 | if (!p->make_directory) | |
571 | return; | |
572 | ||
4b562198 | 573 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 574 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
575 | } |
576 | ||
01f78473 LP |
577 | static int path_start(Unit *u) { |
578 | Path *p = PATH(u); | |
579 | ||
580 | assert(p); | |
fdf20a31 | 581 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 582 | |
3ecaa09b | 583 | if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED) |
01f78473 LP |
584 | return -ENOENT; |
585 | ||
0e456f97 LP |
586 | path_mkdir(p); |
587 | ||
cd43ca73 | 588 | p->result = PATH_SUCCESS; |
ac3f50ca | 589 | path_enter_waiting(p, true, true); |
00dc5d76 | 590 | |
01f78473 LP |
591 | return 0; |
592 | } | |
593 | ||
594 | static int path_stop(Unit *u) { | |
595 | Path *p = PATH(u); | |
596 | ||
597 | assert(p); | |
598 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
599 | ||
cd43ca73 | 600 | path_enter_dead(p, PATH_SUCCESS); |
01f78473 LP |
601 | return 0; |
602 | } | |
603 | ||
604 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
605 | Path *p = PATH(u); | |
606 | ||
607 | assert(u); | |
608 | assert(f); | |
609 | assert(fds); | |
610 | ||
611 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 612 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
613 | |
614 | return 0; | |
615 | } | |
616 | ||
617 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
618 | Path *p = PATH(u); | |
619 | ||
620 | assert(u); | |
621 | assert(key); | |
622 | assert(value); | |
623 | assert(fds); | |
624 | ||
625 | if (streq(key, "state")) { | |
626 | PathState state; | |
627 | ||
e0207c8d ZJS |
628 | state = path_state_from_string(value); |
629 | if (state < 0) | |
01f78473 LP |
630 | log_debug("Failed to parse state value %s", value); |
631 | else | |
632 | p->deserialized_state = state; | |
cd43ca73 LP |
633 | |
634 | } else if (streq(key, "result")) { | |
635 | PathResult f; | |
636 | ||
637 | f = path_result_from_string(value); | |
638 | if (f < 0) | |
639 | log_debug("Failed to parse result value %s", value); | |
640 | else if (f != PATH_SUCCESS) | |
641 | p->result = f; | |
642 | ||
01f78473 LP |
643 | } else |
644 | log_debug("Unknown serialization key '%s'", key); | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
44a6b1b6 | 649 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
650 | assert(u); |
651 | ||
652 | return state_translation_table[PATH(u)->state]; | |
653 | } | |
654 | ||
44a6b1b6 | 655 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
656 | assert(u); |
657 | ||
658 | return path_state_to_string(PATH(u)->state); | |
659 | } | |
660 | ||
718db961 LP |
661 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
662 | PathSpec *s = userdata; | |
663 | Path *p; | |
4b562198 | 664 | int changed; |
01f78473 | 665 | |
718db961 LP |
666 | assert(s); |
667 | assert(s->unit); | |
01f78473 LP |
668 | assert(fd >= 0); |
669 | ||
718db961 LP |
670 | p = PATH(s->unit); |
671 | ||
672028dc LP |
672 | if (p->state != PATH_WAITING && |
673 | p->state != PATH_RUNNING) | |
718db961 | 674 | return 0; |
01f78473 | 675 | |
ac155bb8 | 676 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 677 | |
01f78473 | 678 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 679 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
680 | break; |
681 | ||
682 | if (!s) { | |
683 | log_error("Got event on unknown fd."); | |
684 | goto fail; | |
685 | } | |
686 | ||
718db961 | 687 | changed = path_spec_fd_event(s, revents); |
4b562198 | 688 | if (changed < 0) |
01f78473 | 689 | goto fail; |
01f78473 | 690 | |
672028dc LP |
691 | /* If we are already running, then remember that one event was |
692 | * dispatched so that we restart the service only if something | |
693 | * actually changed on disk */ | |
694 | p->inotify_triggered = true; | |
695 | ||
672028dc LP |
696 | if (changed) |
697 | path_enter_running(p); | |
698 | else | |
ac3f50ca | 699 | path_enter_waiting(p, false, true); |
672028dc | 700 | |
718db961 | 701 | return 0; |
01f78473 LP |
702 | |
703 | fail: | |
cd43ca73 | 704 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 705 | return 0; |
01f78473 LP |
706 | } |
707 | ||
3ecaa09b LP |
708 | static void path_trigger_notify(Unit *u, Unit *other) { |
709 | Path *p = PATH(u); | |
01f78473 | 710 | |
3ecaa09b LP |
711 | assert(u); |
712 | assert(other); | |
01f78473 | 713 | |
3ecaa09b LP |
714 | /* Invoked whenever the unit we trigger changes state or gains |
715 | * or loses a job */ | |
01f78473 | 716 | |
3ecaa09b LP |
717 | if (other->load_state != UNIT_LOADED) |
718 | return; | |
01f78473 | 719 | |
3ecaa09b LP |
720 | if (p->state == PATH_RUNNING && |
721 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
79008bdd | 722 | log_unit_debug(UNIT(p)->id, |
3ecaa09b LP |
723 | "%s got notified about unit deactivation.", |
724 | UNIT(p)->id); | |
672028dc | 725 | |
3ecaa09b LP |
726 | /* Hmm, so inotify was triggered since the |
727 | * last activation, so I guess we need to | |
728 | * recheck what is going on. */ | |
729 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 730 | } |
01f78473 LP |
731 | } |
732 | ||
fdf20a31 | 733 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
734 | Path *p = PATH(u); |
735 | ||
736 | assert(p); | |
737 | ||
fdf20a31 | 738 | if (p->state == PATH_FAILED) |
5632e374 LP |
739 | path_set_state(p, PATH_DEAD); |
740 | ||
cd43ca73 | 741 | p->result = PATH_SUCCESS; |
5632e374 LP |
742 | } |
743 | ||
01f78473 LP |
744 | static const char* const path_state_table[_PATH_STATE_MAX] = { |
745 | [PATH_DEAD] = "dead", | |
746 | [PATH_WAITING] = "waiting", | |
747 | [PATH_RUNNING] = "running", | |
fdf20a31 | 748 | [PATH_FAILED] = "failed" |
01f78473 LP |
749 | }; |
750 | ||
751 | DEFINE_STRING_TABLE_LOOKUP(path_state, PathState); | |
752 | ||
753 | static const char* const path_type_table[_PATH_TYPE_MAX] = { | |
754 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 755 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 756 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 757 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 758 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
759 | }; |
760 | ||
761 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
762 | ||
cd43ca73 LP |
763 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
764 | [PATH_SUCCESS] = "success", | |
2c5859af | 765 | [PATH_FAILURE_RESOURCES] = "resources", |
cd43ca73 LP |
766 | }; |
767 | ||
768 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
769 | ||
01f78473 | 770 | const UnitVTable path_vtable = { |
7d17cfbc | 771 | .object_size = sizeof(Path), |
718db961 | 772 | |
f975e971 LP |
773 | .sections = |
774 | "Unit\0" | |
775 | "Path\0" | |
776 | "Install\0", | |
01f78473 | 777 | |
0e456f97 | 778 | .init = path_init, |
01f78473 LP |
779 | .done = path_done, |
780 | .load = path_load, | |
781 | ||
782 | .coldplug = path_coldplug, | |
783 | ||
784 | .dump = path_dump, | |
785 | ||
786 | .start = path_start, | |
787 | .stop = path_stop, | |
788 | ||
789 | .serialize = path_serialize, | |
790 | .deserialize_item = path_deserialize_item, | |
791 | ||
792 | .active_state = path_active_state, | |
793 | .sub_state_to_string = path_sub_state_to_string, | |
794 | ||
3ecaa09b LP |
795 | .trigger_notify = path_trigger_notify, |
796 | ||
fdf20a31 | 797 | .reset_failed = path_reset_failed, |
5632e374 | 798 | |
c4e2ceae | 799 | .bus_interface = "org.freedesktop.systemd1.Path", |
aec8de63 | 800 | .bus_vtable = bus_path_vtable |
01f78473 | 801 | }; |