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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" |
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 | ||
171 | if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) { | |
56f64d95 | 172 | log_error_errno(errno, "FIONREAD failed: %m"); |
a163db44 | 173 | return -errno; |
4b562198 MS |
174 | } |
175 | ||
176 | assert(l > 0); | |
177 | ||
15f55e80 | 178 | buf = malloc(l); |
a163db44 ZJS |
179 | if (!buf) |
180 | return log_oom(); | |
4b562198 | 181 | |
15f55e80 ZJS |
182 | k = read(s->inotify_fd, buf, l); |
183 | if (k < 0) { | |
56f64d95 | 184 | log_error_errno(errno, "Failed to read inotify event: %m"); |
a163db44 | 185 | return -errno; |
4b562198 MS |
186 | } |
187 | ||
188 | e = (struct inotify_event*) buf; | |
189 | ||
190 | while (k > 0) { | |
191 | size_t step; | |
192 | ||
714d943f MS |
193 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && |
194 | s->primary_wd == e->wd) | |
4b562198 MS |
195 | r = 1; |
196 | ||
197 | step = sizeof(struct inotify_event) + e->len; | |
198 | assert(step <= (size_t) k); | |
199 | ||
200 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
201 | k -= step; | |
202 | } | |
a163db44 | 203 | |
4b562198 MS |
204 | return r; |
205 | } | |
206 | ||
57020a3a | 207 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
208 | bool good = false; |
209 | ||
210 | switch (s->type) { | |
211 | ||
212 | case PATH_EXISTS: | |
213 | good = access(s->path, F_OK) >= 0; | |
214 | break; | |
215 | ||
216 | case PATH_EXISTS_GLOB: | |
217 | good = glob_exists(s->path) > 0; | |
218 | break; | |
219 | ||
220 | case PATH_DIRECTORY_NOT_EMPTY: { | |
221 | int k; | |
222 | ||
223 | k = dir_is_empty(s->path); | |
224 | good = !(k == -ENOENT || k > 0); | |
225 | break; | |
226 | } | |
227 | ||
714d943f MS |
228 | case PATH_CHANGED: |
229 | case PATH_MODIFIED: { | |
4b562198 MS |
230 | bool b; |
231 | ||
232 | b = access(s->path, F_OK) >= 0; | |
233 | good = !initial && b != s->previous_exists; | |
234 | s->previous_exists = b; | |
235 | break; | |
236 | } | |
237 | ||
238 | default: | |
239 | ; | |
240 | } | |
241 | ||
242 | return good; | |
243 | } | |
244 | ||
57020a3a | 245 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
246 | int r; |
247 | ||
248 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
249 | return; | |
250 | ||
15f55e80 ZJS |
251 | r = mkdir_p_label(s->path, mode); |
252 | if (r < 0) | |
da927ba9 | 253 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
254 | } |
255 | ||
57020a3a | 256 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
257 | fprintf(f, |
258 | "%s%s: %s\n", | |
259 | prefix, | |
260 | path_type_to_string(s->type), | |
261 | s->path); | |
262 | } | |
263 | ||
57020a3a LP |
264 | void path_spec_done(PathSpec *s) { |
265 | assert(s); | |
4b562198 | 266 | assert(s->inotify_fd == -1); |
57020a3a | 267 | |
4b562198 MS |
268 | free(s->path); |
269 | } | |
270 | ||
271 | static void path_init(Unit *u) { | |
272 | Path *p = PATH(u); | |
273 | ||
274 | assert(u); | |
ac155bb8 | 275 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
276 | |
277 | p->directory_mode = 0755; | |
278 | } | |
279 | ||
74051b9b | 280 | void path_free_specs(Path *p) { |
01f78473 LP |
281 | PathSpec *s; |
282 | ||
283 | assert(p); | |
284 | ||
285 | while ((s = p->specs)) { | |
718db961 | 286 | path_spec_unwatch(s); |
71fda00f | 287 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 288 | path_spec_done(s); |
01f78473 LP |
289 | free(s); |
290 | } | |
291 | } | |
292 | ||
74051b9b LP |
293 | static void path_done(Unit *u) { |
294 | Path *p = PATH(u); | |
295 | ||
296 | assert(p); | |
297 | ||
74051b9b LP |
298 | path_free_specs(p); |
299 | } | |
300 | ||
a57f7e2c | 301 | static int path_add_mount_links(Path *p) { |
01f78473 LP |
302 | PathSpec *s; |
303 | int r; | |
304 | ||
305 | assert(p); | |
01f78473 LP |
306 | |
307 | LIST_FOREACH(spec, s, p->specs) { | |
a57f7e2c | 308 | r = unit_require_mounts_for(UNIT(p), s->path); |
e0207c8d | 309 | if (r < 0) |
01f78473 | 310 | return r; |
e0207c8d | 311 | } |
01f78473 LP |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static int path_verify(Path *p) { | |
317 | assert(p); | |
318 | ||
1124fe6f | 319 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
320 | return 0; |
321 | ||
322 | if (!p->specs) { | |
79008bdd | 323 | log_unit_error(UNIT(p)->id, |
66870f90 | 324 | "%s lacks path setting. Refusing.", UNIT(p)->id); |
01f78473 LP |
325 | return -EINVAL; |
326 | } | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
6c155fe3 LP |
331 | static int path_add_default_dependencies(Path *p) { |
332 | int r; | |
333 | ||
334 | assert(p); | |
335 | ||
e3d84721 LP |
336 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, |
337 | SPECIAL_PATHS_TARGET, NULL, true); | |
338 | if (r < 0) | |
339 | return r; | |
2a77d31d | 340 | |
e3d84721 | 341 | if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) { |
e0207c8d ZJS |
342 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, |
343 | SPECIAL_SYSINIT_TARGET, NULL, true); | |
344 | if (r < 0) | |
6c155fe3 | 345 | return r; |
2a77d31d | 346 | } |
6c155fe3 | 347 | |
e0207c8d ZJS |
348 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, |
349 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
6c155fe3 LP |
350 | } |
351 | ||
01f78473 LP |
352 | static int path_load(Unit *u) { |
353 | Path *p = PATH(u); | |
354 | int r; | |
355 | ||
356 | assert(u); | |
ac155bb8 | 357 | assert(u->load_state == UNIT_STUB); |
01f78473 | 358 | |
e0207c8d ZJS |
359 | r = unit_load_fragment_and_dropin(u); |
360 | if (r < 0) | |
01f78473 LP |
361 | return r; |
362 | ||
ac155bb8 | 363 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 364 | |
3ecaa09b | 365 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { |
57020a3a LP |
366 | Unit *x; |
367 | ||
368 | r = unit_load_related_unit(u, ".service", &x); | |
369 | if (r < 0) | |
01f78473 LP |
370 | return r; |
371 | ||
3ecaa09b LP |
372 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); |
373 | if (r < 0) | |
374 | return r; | |
57020a3a LP |
375 | } |
376 | ||
e0207c8d ZJS |
377 | r = path_add_mount_links(p); |
378 | if (r < 0) | |
01f78473 | 379 | return r; |
a40eb732 | 380 | |
e0207c8d ZJS |
381 | if (UNIT(p)->default_dependencies) { |
382 | r = path_add_default_dependencies(p); | |
383 | if (r < 0) | |
a40eb732 | 384 | return r; |
e0207c8d | 385 | } |
01f78473 LP |
386 | } |
387 | ||
388 | return path_verify(p); | |
389 | } | |
390 | ||
391 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
392 | Path *p = PATH(u); | |
3ecaa09b | 393 | Unit *trigger; |
01f78473 LP |
394 | PathSpec *s; |
395 | ||
e364ad06 LP |
396 | assert(p); |
397 | assert(f); | |
01f78473 | 398 | |
3ecaa09b LP |
399 | trigger = UNIT_TRIGGER(u); |
400 | ||
01f78473 LP |
401 | fprintf(f, |
402 | "%sPath State: %s\n" | |
cd43ca73 | 403 | "%sResult: %s\n" |
0e456f97 LP |
404 | "%sUnit: %s\n" |
405 | "%sMakeDirectory: %s\n" | |
406 | "%sDirectoryMode: %04o\n", | |
01f78473 | 407 | prefix, path_state_to_string(p->state), |
cd43ca73 | 408 | prefix, path_result_to_string(p->result), |
3ecaa09b | 409 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
410 | prefix, yes_no(p->make_directory), |
411 | prefix, p->directory_mode); | |
01f78473 LP |
412 | |
413 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 414 | path_spec_dump(s, f, prefix); |
01f78473 LP |
415 | } |
416 | ||
417 | static void path_unwatch(Path *p) { | |
418 | PathSpec *s; | |
419 | ||
420 | assert(p); | |
421 | ||
422 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 423 | path_spec_unwatch(s); |
01f78473 LP |
424 | } |
425 | ||
426 | static int path_watch(Path *p) { | |
427 | int r; | |
428 | PathSpec *s; | |
429 | ||
430 | assert(p); | |
431 | ||
e0207c8d | 432 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 433 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 434 | if (r < 0) |
01f78473 | 435 | return r; |
e0207c8d | 436 | } |
01f78473 LP |
437 | |
438 | return 0; | |
439 | } | |
440 | ||
441 | static void path_set_state(Path *p, PathState state) { | |
442 | PathState old_state; | |
443 | assert(p); | |
444 | ||
445 | old_state = p->state; | |
446 | p->state = state; | |
447 | ||
672028dc LP |
448 | if (state != PATH_WAITING && |
449 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
450 | path_unwatch(p); |
451 | ||
452 | if (state != old_state) | |
453 | log_debug("%s changed %s -> %s", | |
1124fe6f | 454 | UNIT(p)->id, |
01f78473 LP |
455 | path_state_to_string(old_state), |
456 | path_state_to_string(state)); | |
457 | ||
e2f3b44c | 458 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
459 | } |
460 | ||
ac3f50ca | 461 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 LP |
462 | |
463 | static int path_coldplug(Unit *u) { | |
464 | Path *p = PATH(u); | |
465 | ||
466 | assert(p); | |
467 | assert(p->state == PATH_DEAD); | |
468 | ||
469 | if (p->deserialized_state != p->state) { | |
470 | ||
471 | if (p->deserialized_state == PATH_WAITING || | |
472 | p->deserialized_state == PATH_RUNNING) | |
ac3f50ca | 473 | path_enter_waiting(p, true, true); |
01f78473 LP |
474 | else |
475 | path_set_state(p, p->deserialized_state); | |
476 | } | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
cd43ca73 | 481 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
482 | assert(p); |
483 | ||
cd43ca73 LP |
484 | if (f != PATH_SUCCESS) |
485 | p->result = f; | |
01f78473 | 486 | |
cd43ca73 | 487 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
488 | } |
489 | ||
490 | static void path_enter_running(Path *p) { | |
718db961 | 491 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
01f78473 | 492 | int r; |
398ef8ba | 493 | |
01f78473 | 494 | assert(p); |
3ecaa09b | 495 | |
ba3e67a7 | 496 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 497 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
498 | return; |
499 | ||
3ecaa09b | 500 | r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)), |
e0207c8d ZJS |
501 | JOB_REPLACE, true, &error, NULL); |
502 | if (r < 0) | |
01f78473 LP |
503 | goto fail; |
504 | ||
672028dc LP |
505 | p->inotify_triggered = false; |
506 | ||
e0207c8d ZJS |
507 | r = path_watch(p); |
508 | if (r < 0) | |
672028dc LP |
509 | goto fail; |
510 | ||
01f78473 LP |
511 | path_set_state(p, PATH_RUNNING); |
512 | return; | |
513 | ||
514 | fail: | |
e0207c8d | 515 | log_warning("%s failed to queue unit startup job: %s", |
718db961 | 516 | UNIT(p)->id, bus_error_message(&error, r)); |
cd43ca73 | 517 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
518 | } |
519 | ||
ac3f50ca | 520 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 521 | PathSpec *s; |
01f78473 LP |
522 | bool good = false; |
523 | ||
ac3f50ca | 524 | assert(p); |
672028dc | 525 | |
01f78473 | 526 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 527 | good = path_spec_check_good(s, initial); |
01f78473 LP |
528 | |
529 | if (good) | |
530 | break; | |
531 | } | |
532 | ||
ac3f50ca LP |
533 | return good; |
534 | } | |
01f78473 | 535 | |
ac3f50ca LP |
536 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
537 | int r; | |
0595f9a1 | 538 | |
ac3f50ca LP |
539 | if (recheck) |
540 | if (path_check_good(p, initial)) { | |
1124fe6f | 541 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
542 | path_enter_running(p); |
543 | return; | |
544 | } | |
545 | ||
e0207c8d ZJS |
546 | r = path_watch(p); |
547 | if (r < 0) | |
ac3f50ca LP |
548 | goto fail; |
549 | ||
550 | /* Hmm, so now we have created inotify watches, but the file | |
551 | * might have appeared/been removed by now, so we must | |
552 | * recheck */ | |
553 | ||
554 | if (recheck) | |
555 | if (path_check_good(p, false)) { | |
1124fe6f | 556 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
557 | path_enter_running(p); |
558 | return; | |
559 | } | |
01f78473 LP |
560 | |
561 | path_set_state(p, PATH_WAITING); | |
562 | return; | |
563 | ||
564 | fail: | |
c33b3297 | 565 | log_warning_errno(r, "%s failed to enter waiting state: %m", UNIT(p)->id); |
cd43ca73 | 566 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
567 | } |
568 | ||
0e456f97 LP |
569 | static void path_mkdir(Path *p) { |
570 | PathSpec *s; | |
571 | ||
572 | assert(p); | |
573 | ||
574 | if (!p->make_directory) | |
575 | return; | |
576 | ||
4b562198 | 577 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 578 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
579 | } |
580 | ||
01f78473 LP |
581 | static int path_start(Unit *u) { |
582 | Path *p = PATH(u); | |
583 | ||
584 | assert(p); | |
fdf20a31 | 585 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 586 | |
3ecaa09b | 587 | if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED) |
01f78473 LP |
588 | return -ENOENT; |
589 | ||
0e456f97 LP |
590 | path_mkdir(p); |
591 | ||
cd43ca73 | 592 | p->result = PATH_SUCCESS; |
ac3f50ca | 593 | path_enter_waiting(p, true, true); |
00dc5d76 | 594 | |
01f78473 LP |
595 | return 0; |
596 | } | |
597 | ||
598 | static int path_stop(Unit *u) { | |
599 | Path *p = PATH(u); | |
600 | ||
601 | assert(p); | |
602 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
603 | ||
cd43ca73 | 604 | path_enter_dead(p, PATH_SUCCESS); |
01f78473 LP |
605 | return 0; |
606 | } | |
607 | ||
608 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
609 | Path *p = PATH(u); | |
610 | ||
611 | assert(u); | |
612 | assert(f); | |
613 | assert(fds); | |
614 | ||
615 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 616 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
617 | |
618 | return 0; | |
619 | } | |
620 | ||
621 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
622 | Path *p = PATH(u); | |
623 | ||
624 | assert(u); | |
625 | assert(key); | |
626 | assert(value); | |
627 | assert(fds); | |
628 | ||
629 | if (streq(key, "state")) { | |
630 | PathState state; | |
631 | ||
e0207c8d ZJS |
632 | state = path_state_from_string(value); |
633 | if (state < 0) | |
01f78473 LP |
634 | log_debug("Failed to parse state value %s", value); |
635 | else | |
636 | p->deserialized_state = state; | |
cd43ca73 LP |
637 | |
638 | } else if (streq(key, "result")) { | |
639 | PathResult f; | |
640 | ||
641 | f = path_result_from_string(value); | |
642 | if (f < 0) | |
643 | log_debug("Failed to parse result value %s", value); | |
644 | else if (f != PATH_SUCCESS) | |
645 | p->result = f; | |
646 | ||
01f78473 LP |
647 | } else |
648 | log_debug("Unknown serialization key '%s'", key); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
44a6b1b6 | 653 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
654 | assert(u); |
655 | ||
656 | return state_translation_table[PATH(u)->state]; | |
657 | } | |
658 | ||
44a6b1b6 | 659 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
660 | assert(u); |
661 | ||
662 | return path_state_to_string(PATH(u)->state); | |
663 | } | |
664 | ||
718db961 LP |
665 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
666 | PathSpec *s = userdata; | |
667 | Path *p; | |
4b562198 | 668 | int changed; |
01f78473 | 669 | |
718db961 LP |
670 | assert(s); |
671 | assert(s->unit); | |
01f78473 LP |
672 | assert(fd >= 0); |
673 | ||
718db961 LP |
674 | p = PATH(s->unit); |
675 | ||
672028dc LP |
676 | if (p->state != PATH_WAITING && |
677 | p->state != PATH_RUNNING) | |
718db961 | 678 | return 0; |
01f78473 | 679 | |
ac155bb8 | 680 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 681 | |
01f78473 | 682 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 683 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
684 | break; |
685 | ||
686 | if (!s) { | |
687 | log_error("Got event on unknown fd."); | |
688 | goto fail; | |
689 | } | |
690 | ||
718db961 | 691 | changed = path_spec_fd_event(s, revents); |
4b562198 | 692 | if (changed < 0) |
01f78473 | 693 | goto fail; |
01f78473 | 694 | |
672028dc LP |
695 | /* If we are already running, then remember that one event was |
696 | * dispatched so that we restart the service only if something | |
697 | * actually changed on disk */ | |
698 | p->inotify_triggered = true; | |
699 | ||
672028dc LP |
700 | if (changed) |
701 | path_enter_running(p); | |
702 | else | |
ac3f50ca | 703 | path_enter_waiting(p, false, true); |
672028dc | 704 | |
718db961 | 705 | return 0; |
01f78473 LP |
706 | |
707 | fail: | |
cd43ca73 | 708 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 709 | return 0; |
01f78473 LP |
710 | } |
711 | ||
3ecaa09b LP |
712 | static void path_trigger_notify(Unit *u, Unit *other) { |
713 | Path *p = PATH(u); | |
01f78473 | 714 | |
3ecaa09b LP |
715 | assert(u); |
716 | assert(other); | |
01f78473 | 717 | |
3ecaa09b LP |
718 | /* Invoked whenever the unit we trigger changes state or gains |
719 | * or loses a job */ | |
01f78473 | 720 | |
3ecaa09b LP |
721 | if (other->load_state != UNIT_LOADED) |
722 | return; | |
01f78473 | 723 | |
3ecaa09b LP |
724 | if (p->state == PATH_RUNNING && |
725 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
79008bdd | 726 | log_unit_debug(UNIT(p)->id, |
3ecaa09b LP |
727 | "%s got notified about unit deactivation.", |
728 | UNIT(p)->id); | |
672028dc | 729 | |
3ecaa09b LP |
730 | /* Hmm, so inotify was triggered since the |
731 | * last activation, so I guess we need to | |
732 | * recheck what is going on. */ | |
733 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 734 | } |
01f78473 LP |
735 | } |
736 | ||
fdf20a31 | 737 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
738 | Path *p = PATH(u); |
739 | ||
740 | assert(p); | |
741 | ||
fdf20a31 | 742 | if (p->state == PATH_FAILED) |
5632e374 LP |
743 | path_set_state(p, PATH_DEAD); |
744 | ||
cd43ca73 | 745 | p->result = PATH_SUCCESS; |
5632e374 LP |
746 | } |
747 | ||
01f78473 LP |
748 | static const char* const path_state_table[_PATH_STATE_MAX] = { |
749 | [PATH_DEAD] = "dead", | |
750 | [PATH_WAITING] = "waiting", | |
751 | [PATH_RUNNING] = "running", | |
fdf20a31 | 752 | [PATH_FAILED] = "failed" |
01f78473 LP |
753 | }; |
754 | ||
755 | DEFINE_STRING_TABLE_LOOKUP(path_state, PathState); | |
756 | ||
757 | static const char* const path_type_table[_PATH_TYPE_MAX] = { | |
758 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 759 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 760 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 761 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 762 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
763 | }; |
764 | ||
765 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
766 | ||
cd43ca73 LP |
767 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
768 | [PATH_SUCCESS] = "success", | |
2c5859af | 769 | [PATH_FAILURE_RESOURCES] = "resources", |
cd43ca73 LP |
770 | }; |
771 | ||
772 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
773 | ||
01f78473 | 774 | const UnitVTable path_vtable = { |
7d17cfbc | 775 | .object_size = sizeof(Path), |
718db961 | 776 | |
f975e971 LP |
777 | .sections = |
778 | "Unit\0" | |
779 | "Path\0" | |
780 | "Install\0", | |
01f78473 | 781 | |
0e456f97 | 782 | .init = path_init, |
01f78473 LP |
783 | .done = path_done, |
784 | .load = path_load, | |
785 | ||
786 | .coldplug = path_coldplug, | |
787 | ||
788 | .dump = path_dump, | |
789 | ||
790 | .start = path_start, | |
791 | .stop = path_stop, | |
792 | ||
793 | .serialize = path_serialize, | |
794 | .deserialize_item = path_deserialize_item, | |
795 | ||
796 | .active_state = path_active_state, | |
797 | .sub_state_to_string = path_sub_state_to_string, | |
798 | ||
3ecaa09b LP |
799 | .trigger_notify = path_trigger_notify, |
800 | ||
fdf20a31 | 801 | .reset_failed = path_reset_failed, |
5632e374 | 802 | |
c4e2ceae | 803 | .bus_interface = "org.freedesktop.systemd1.Path", |
aec8de63 | 804 | .bus_vtable = bus_path_vtable |
01f78473 | 805 | }; |