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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> | |
01f78473 LP |
24 | #include <errno.h> |
25 | #include <unistd.h> | |
26 | ||
27 | #include "unit.h" | |
28 | #include "unit-name.h" | |
29 | #include "path.h" | |
49e942b2 | 30 | #include "mkdir.h" |
01f78473 | 31 | #include "dbus-path.h" |
a40eb732 | 32 | #include "special.h" |
f8c16f42 | 33 | #include "macro.h" |
718db961 LP |
34 | #include "bus-util.h" |
35 | #include "bus-error.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 | ||
718db961 LP |
44 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
45 | ||
46 | int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) { | |
57020a3a | 47 | |
4b562198 MS |
48 | static const int flags_table[_PATH_TYPE_MAX] = { |
49 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
50 | [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
51 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
e9223856 | 52 | [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 |
53 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO |
54 | }; | |
55 | ||
56 | bool exists = false; | |
bc41f93e | 57 | char *slash, *oldslash = NULL; |
4b562198 | 58 | int r; |
0e456f97 | 59 | |
4b562198 | 60 | assert(s); |
718db961 LP |
61 | assert(s->unit); |
62 | assert(handler); | |
0e456f97 | 63 | |
718db961 | 64 | path_spec_unwatch(s); |
4b562198 | 65 | |
f8c16f42 ZJS |
66 | s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
67 | if (s->inotify_fd < 0) { | |
4b562198 MS |
68 | r = -errno; |
69 | goto fail; | |
70 | } | |
71 | ||
151b9b96 | 72 | r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s); |
f8c16f42 | 73 | if (r < 0) |
4b562198 | 74 | goto fail; |
4b562198 | 75 | |
bc41f93e | 76 | /* This assumes the path was passed through path_kill_slashes()! */ |
4b562198 | 77 | |
180d6802 MS |
78 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { |
79 | char *cut = NULL; | |
4b562198 | 80 | int flags; |
bc41f93e ZJS |
81 | char tmp; |
82 | ||
83 | if (slash) { | |
180d6802 MS |
84 | cut = slash + (slash == s->path); |
85 | tmp = *cut; | |
86 | *cut = '\0'; | |
87 | ||
bc41f93e | 88 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; |
180d6802 | 89 | } else |
bc41f93e | 90 | flags = flags_table[s->type]; |
4b562198 | 91 | |
180d6802 | 92 | r = inotify_add_watch(s->inotify_fd, s->path, flags); |
bc41f93e | 93 | if (r < 0) { |
180d6802 MS |
94 | if (errno == EACCES || errno == ENOENT) { |
95 | if (cut) | |
96 | *cut = tmp; | |
bc41f93e | 97 | break; |
180d6802 | 98 | } |
4b562198 | 99 | |
18abe7bd ZJS |
100 | log_warning("Failed to add watch on %s: %s", s->path, |
101 | errno == ENOSPC ? "too many watches" : strerror(-r)); | |
28a79bd2 | 102 | r = -errno; |
180d6802 MS |
103 | if (cut) |
104 | *cut = tmp; | |
28a79bd2 | 105 | goto fail; |
bc41f93e ZJS |
106 | } else { |
107 | exists = true; | |
108 | ||
109 | /* Path exists, we don't need to watch parent | |
110 | too closely. */ | |
111 | if (oldslash) { | |
180d6802 MS |
112 | char *cut2 = oldslash + (oldslash == s->path); |
113 | char tmp2 = *cut2; | |
114 | *cut2 = '\0'; | |
bc41f93e | 115 | |
180d6802 | 116 | inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); |
bc41f93e ZJS |
117 | /* Error is ignored, the worst can happen is |
118 | we get spurious events. */ | |
119 | ||
180d6802 | 120 | *cut2 = tmp2; |
bc41f93e | 121 | } |
28a79bd2 | 122 | } |
bc41f93e | 123 | |
180d6802 MS |
124 | if (cut) |
125 | *cut = tmp; | |
126 | ||
127 | if (slash) | |
bc41f93e | 128 | oldslash = slash; |
180d6802 | 129 | else { |
bc41f93e ZJS |
130 | /* whole path has been iterated over */ |
131 | s->primary_wd = r; | |
132 | break; | |
133 | } | |
134 | } | |
135 | ||
28a79bd2 | 136 | if (!exists) { |
56f64d95 | 137 | log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", |
28a79bd2 | 138 | s->path); |
bc41f93e | 139 | r = -errno; /* either EACCESS or ENOENT */ |
28a79bd2 ZJS |
140 | goto fail; |
141 | } | |
142 | ||
4b562198 MS |
143 | return 0; |
144 | ||
145 | fail: | |
718db961 | 146 | path_spec_unwatch(s); |
4b562198 | 147 | return r; |
0e456f97 LP |
148 | } |
149 | ||
718db961 LP |
150 | void path_spec_unwatch(PathSpec *s) { |
151 | assert(s); | |
62347bc2 | 152 | |
718db961 | 153 | s->event_source = sd_event_source_unref(s->event_source); |
03e334a1 | 154 | s->inotify_fd = safe_close(s->inotify_fd); |
62347bc2 LP |
155 | } |
156 | ||
718db961 | 157 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { |
0254e944 | 158 | union inotify_event_buffer buffer; |
4b562198 | 159 | struct inotify_event *e; |
f7c1ad4f | 160 | ssize_t l; |
4b562198 MS |
161 | int r = 0; |
162 | ||
718db961 | 163 | if (revents != EPOLLIN) { |
15f55e80 | 164 | log_error("Got invalid poll event on inotify."); |
a163db44 | 165 | return -EINVAL; |
4b562198 MS |
166 | } |
167 | ||
0254e944 | 168 | l = read(s->inotify_fd, &buffer, sizeof(buffer)); |
f7c1ad4f LP |
169 | if (l < 0) { |
170 | if (errno == EAGAIN || errno == EINTR) | |
171 | return 0; | |
4b562198 | 172 | |
4a62c710 | 173 | return log_error_errno(errno, "Failed to read inotify event: %m"); |
f7c1ad4f | 174 | } |
4b562198 | 175 | |
f7c1ad4f | 176 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
714d943f MS |
177 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && |
178 | s->primary_wd == e->wd) | |
4b562198 | 179 | r = 1; |
4b562198 | 180 | } |
a163db44 | 181 | |
4b562198 MS |
182 | return r; |
183 | } | |
184 | ||
57020a3a | 185 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
186 | bool good = false; |
187 | ||
188 | switch (s->type) { | |
189 | ||
190 | case PATH_EXISTS: | |
191 | good = access(s->path, F_OK) >= 0; | |
192 | break; | |
193 | ||
194 | case PATH_EXISTS_GLOB: | |
195 | good = glob_exists(s->path) > 0; | |
196 | break; | |
197 | ||
198 | case PATH_DIRECTORY_NOT_EMPTY: { | |
199 | int k; | |
200 | ||
201 | k = dir_is_empty(s->path); | |
202 | good = !(k == -ENOENT || k > 0); | |
203 | break; | |
204 | } | |
205 | ||
714d943f MS |
206 | case PATH_CHANGED: |
207 | case PATH_MODIFIED: { | |
4b562198 MS |
208 | bool b; |
209 | ||
210 | b = access(s->path, F_OK) >= 0; | |
211 | good = !initial && b != s->previous_exists; | |
212 | s->previous_exists = b; | |
213 | break; | |
214 | } | |
215 | ||
216 | default: | |
217 | ; | |
218 | } | |
219 | ||
220 | return good; | |
221 | } | |
222 | ||
57020a3a | 223 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
224 | int r; |
225 | ||
226 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
227 | return; | |
228 | ||
15f55e80 ZJS |
229 | r = mkdir_p_label(s->path, mode); |
230 | if (r < 0) | |
da927ba9 | 231 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
232 | } |
233 | ||
57020a3a | 234 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
235 | fprintf(f, |
236 | "%s%s: %s\n", | |
237 | prefix, | |
238 | path_type_to_string(s->type), | |
239 | s->path); | |
240 | } | |
241 | ||
57020a3a LP |
242 | void path_spec_done(PathSpec *s) { |
243 | assert(s); | |
4b562198 | 244 | assert(s->inotify_fd == -1); |
57020a3a | 245 | |
4b562198 MS |
246 | free(s->path); |
247 | } | |
248 | ||
249 | static void path_init(Unit *u) { | |
250 | Path *p = PATH(u); | |
251 | ||
252 | assert(u); | |
ac155bb8 | 253 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
254 | |
255 | p->directory_mode = 0755; | |
256 | } | |
257 | ||
74051b9b | 258 | void path_free_specs(Path *p) { |
01f78473 LP |
259 | PathSpec *s; |
260 | ||
261 | assert(p); | |
262 | ||
263 | while ((s = p->specs)) { | |
718db961 | 264 | path_spec_unwatch(s); |
71fda00f | 265 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 266 | path_spec_done(s); |
01f78473 LP |
267 | free(s); |
268 | } | |
269 | } | |
270 | ||
74051b9b LP |
271 | static void path_done(Unit *u) { |
272 | Path *p = PATH(u); | |
273 | ||
274 | assert(p); | |
275 | ||
74051b9b LP |
276 | path_free_specs(p); |
277 | } | |
278 | ||
a57f7e2c | 279 | static int path_add_mount_links(Path *p) { |
01f78473 LP |
280 | PathSpec *s; |
281 | int r; | |
282 | ||
283 | assert(p); | |
01f78473 LP |
284 | |
285 | LIST_FOREACH(spec, s, p->specs) { | |
a57f7e2c | 286 | r = unit_require_mounts_for(UNIT(p), s->path); |
e0207c8d | 287 | if (r < 0) |
01f78473 | 288 | return r; |
e0207c8d | 289 | } |
01f78473 LP |
290 | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static int path_verify(Path *p) { | |
295 | assert(p); | |
296 | ||
1124fe6f | 297 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
298 | return 0; |
299 | ||
300 | if (!p->specs) { | |
79008bdd | 301 | log_unit_error(UNIT(p)->id, |
66870f90 | 302 | "%s lacks path setting. Refusing.", UNIT(p)->id); |
01f78473 LP |
303 | return -EINVAL; |
304 | } | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
6c155fe3 LP |
309 | static int path_add_default_dependencies(Path *p) { |
310 | int r; | |
311 | ||
312 | assert(p); | |
313 | ||
e3d84721 LP |
314 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, |
315 | SPECIAL_PATHS_TARGET, NULL, true); | |
316 | if (r < 0) | |
317 | return r; | |
2a77d31d | 318 | |
e3d84721 | 319 | if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) { |
e0207c8d ZJS |
320 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, |
321 | SPECIAL_SYSINIT_TARGET, NULL, true); | |
322 | if (r < 0) | |
6c155fe3 | 323 | return r; |
2a77d31d | 324 | } |
6c155fe3 | 325 | |
e0207c8d ZJS |
326 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, |
327 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
6c155fe3 LP |
328 | } |
329 | ||
01f78473 LP |
330 | static int path_load(Unit *u) { |
331 | Path *p = PATH(u); | |
332 | int r; | |
333 | ||
334 | assert(u); | |
ac155bb8 | 335 | assert(u->load_state == UNIT_STUB); |
01f78473 | 336 | |
e0207c8d ZJS |
337 | r = unit_load_fragment_and_dropin(u); |
338 | if (r < 0) | |
01f78473 LP |
339 | return r; |
340 | ||
ac155bb8 | 341 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 342 | |
3ecaa09b | 343 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { |
57020a3a LP |
344 | Unit *x; |
345 | ||
346 | r = unit_load_related_unit(u, ".service", &x); | |
347 | if (r < 0) | |
01f78473 LP |
348 | return r; |
349 | ||
3ecaa09b LP |
350 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); |
351 | if (r < 0) | |
352 | return r; | |
57020a3a LP |
353 | } |
354 | ||
e0207c8d ZJS |
355 | r = path_add_mount_links(p); |
356 | if (r < 0) | |
01f78473 | 357 | return r; |
a40eb732 | 358 | |
e0207c8d ZJS |
359 | if (UNIT(p)->default_dependencies) { |
360 | r = path_add_default_dependencies(p); | |
361 | if (r < 0) | |
a40eb732 | 362 | return r; |
e0207c8d | 363 | } |
01f78473 LP |
364 | } |
365 | ||
366 | return path_verify(p); | |
367 | } | |
368 | ||
369 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
370 | Path *p = PATH(u); | |
3ecaa09b | 371 | Unit *trigger; |
01f78473 LP |
372 | PathSpec *s; |
373 | ||
e364ad06 LP |
374 | assert(p); |
375 | assert(f); | |
01f78473 | 376 | |
3ecaa09b LP |
377 | trigger = UNIT_TRIGGER(u); |
378 | ||
01f78473 LP |
379 | fprintf(f, |
380 | "%sPath State: %s\n" | |
cd43ca73 | 381 | "%sResult: %s\n" |
0e456f97 LP |
382 | "%sUnit: %s\n" |
383 | "%sMakeDirectory: %s\n" | |
384 | "%sDirectoryMode: %04o\n", | |
01f78473 | 385 | prefix, path_state_to_string(p->state), |
cd43ca73 | 386 | prefix, path_result_to_string(p->result), |
3ecaa09b | 387 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
388 | prefix, yes_no(p->make_directory), |
389 | prefix, p->directory_mode); | |
01f78473 LP |
390 | |
391 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 392 | path_spec_dump(s, f, prefix); |
01f78473 LP |
393 | } |
394 | ||
395 | static void path_unwatch(Path *p) { | |
396 | PathSpec *s; | |
397 | ||
398 | assert(p); | |
399 | ||
400 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 401 | path_spec_unwatch(s); |
01f78473 LP |
402 | } |
403 | ||
404 | static int path_watch(Path *p) { | |
405 | int r; | |
406 | PathSpec *s; | |
407 | ||
408 | assert(p); | |
409 | ||
e0207c8d | 410 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 411 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 412 | if (r < 0) |
01f78473 | 413 | return r; |
e0207c8d | 414 | } |
01f78473 LP |
415 | |
416 | return 0; | |
417 | } | |
418 | ||
419 | static void path_set_state(Path *p, PathState state) { | |
420 | PathState old_state; | |
421 | assert(p); | |
422 | ||
423 | old_state = p->state; | |
424 | p->state = state; | |
425 | ||
672028dc LP |
426 | if (state != PATH_WAITING && |
427 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
428 | path_unwatch(p); |
429 | ||
430 | if (state != old_state) | |
431 | log_debug("%s changed %s -> %s", | |
1124fe6f | 432 | UNIT(p)->id, |
01f78473 LP |
433 | path_state_to_string(old_state), |
434 | path_state_to_string(state)); | |
435 | ||
e2f3b44c | 436 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
437 | } |
438 | ||
ac3f50ca | 439 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 | 440 | |
be847e82 | 441 | static int path_coldplug(Unit *u) { |
01f78473 LP |
442 | Path *p = PATH(u); |
443 | ||
444 | assert(p); | |
445 | assert(p->state == PATH_DEAD); | |
446 | ||
447 | if (p->deserialized_state != p->state) { | |
448 | ||
449 | if (p->deserialized_state == PATH_WAITING || | |
be847e82 LP |
450 | p->deserialized_state == PATH_RUNNING) |
451 | path_enter_waiting(p, true, true); | |
452 | else | |
01f78473 LP |
453 | path_set_state(p, p->deserialized_state); |
454 | } | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
cd43ca73 | 459 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
460 | assert(p); |
461 | ||
cd43ca73 LP |
462 | if (f != PATH_SUCCESS) |
463 | p->result = f; | |
01f78473 | 464 | |
cd43ca73 | 465 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
466 | } |
467 | ||
468 | static void path_enter_running(Path *p) { | |
718db961 | 469 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
01f78473 | 470 | int r; |
398ef8ba | 471 | |
01f78473 | 472 | assert(p); |
3ecaa09b | 473 | |
ba3e67a7 | 474 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 475 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
476 | return; |
477 | ||
3ecaa09b | 478 | r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)), |
e0207c8d ZJS |
479 | JOB_REPLACE, true, &error, NULL); |
480 | if (r < 0) | |
01f78473 LP |
481 | goto fail; |
482 | ||
672028dc LP |
483 | p->inotify_triggered = false; |
484 | ||
e0207c8d ZJS |
485 | r = path_watch(p); |
486 | if (r < 0) | |
672028dc LP |
487 | goto fail; |
488 | ||
01f78473 LP |
489 | path_set_state(p, PATH_RUNNING); |
490 | return; | |
491 | ||
492 | fail: | |
e0207c8d | 493 | log_warning("%s failed to queue unit startup job: %s", |
718db961 | 494 | UNIT(p)->id, bus_error_message(&error, r)); |
cd43ca73 | 495 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
496 | } |
497 | ||
ac3f50ca | 498 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 499 | PathSpec *s; |
01f78473 LP |
500 | bool good = false; |
501 | ||
ac3f50ca | 502 | assert(p); |
672028dc | 503 | |
01f78473 | 504 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 505 | good = path_spec_check_good(s, initial); |
01f78473 LP |
506 | |
507 | if (good) | |
508 | break; | |
509 | } | |
510 | ||
ac3f50ca LP |
511 | return good; |
512 | } | |
01f78473 | 513 | |
ac3f50ca LP |
514 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
515 | int r; | |
0595f9a1 | 516 | |
ac3f50ca LP |
517 | if (recheck) |
518 | if (path_check_good(p, initial)) { | |
1124fe6f | 519 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
520 | path_enter_running(p); |
521 | return; | |
522 | } | |
523 | ||
e0207c8d ZJS |
524 | r = path_watch(p); |
525 | if (r < 0) | |
ac3f50ca LP |
526 | goto fail; |
527 | ||
528 | /* Hmm, so now we have created inotify watches, but the file | |
529 | * might have appeared/been removed by now, so we must | |
530 | * recheck */ | |
531 | ||
532 | if (recheck) | |
533 | if (path_check_good(p, false)) { | |
1124fe6f | 534 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
535 | path_enter_running(p); |
536 | return; | |
537 | } | |
01f78473 LP |
538 | |
539 | path_set_state(p, PATH_WAITING); | |
540 | return; | |
541 | ||
542 | fail: | |
c33b3297 | 543 | log_warning_errno(r, "%s failed to enter waiting state: %m", UNIT(p)->id); |
cd43ca73 | 544 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
545 | } |
546 | ||
0e456f97 LP |
547 | static void path_mkdir(Path *p) { |
548 | PathSpec *s; | |
549 | ||
550 | assert(p); | |
551 | ||
552 | if (!p->make_directory) | |
553 | return; | |
554 | ||
4b562198 | 555 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 556 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
557 | } |
558 | ||
01f78473 LP |
559 | static int path_start(Unit *u) { |
560 | Path *p = PATH(u); | |
561 | ||
562 | assert(p); | |
fdf20a31 | 563 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 564 | |
3ecaa09b | 565 | if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED) |
01f78473 LP |
566 | return -ENOENT; |
567 | ||
0e456f97 LP |
568 | path_mkdir(p); |
569 | ||
cd43ca73 | 570 | p->result = PATH_SUCCESS; |
ac3f50ca | 571 | path_enter_waiting(p, true, true); |
00dc5d76 | 572 | |
82a2b6bb | 573 | return 1; |
01f78473 LP |
574 | } |
575 | ||
576 | static int path_stop(Unit *u) { | |
577 | Path *p = PATH(u); | |
578 | ||
579 | assert(p); | |
580 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
581 | ||
cd43ca73 | 582 | path_enter_dead(p, PATH_SUCCESS); |
82a2b6bb | 583 | return 1; |
01f78473 LP |
584 | } |
585 | ||
586 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
587 | Path *p = PATH(u); | |
588 | ||
589 | assert(u); | |
590 | assert(f); | |
591 | assert(fds); | |
592 | ||
593 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 594 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
595 | |
596 | return 0; | |
597 | } | |
598 | ||
599 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
600 | Path *p = PATH(u); | |
601 | ||
602 | assert(u); | |
603 | assert(key); | |
604 | assert(value); | |
605 | assert(fds); | |
606 | ||
607 | if (streq(key, "state")) { | |
608 | PathState state; | |
609 | ||
e0207c8d ZJS |
610 | state = path_state_from_string(value); |
611 | if (state < 0) | |
01f78473 LP |
612 | log_debug("Failed to parse state value %s", value); |
613 | else | |
614 | p->deserialized_state = state; | |
cd43ca73 LP |
615 | |
616 | } else if (streq(key, "result")) { | |
617 | PathResult f; | |
618 | ||
619 | f = path_result_from_string(value); | |
620 | if (f < 0) | |
621 | log_debug("Failed to parse result value %s", value); | |
622 | else if (f != PATH_SUCCESS) | |
623 | p->result = f; | |
624 | ||
01f78473 LP |
625 | } else |
626 | log_debug("Unknown serialization key '%s'", key); | |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
44a6b1b6 | 631 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
632 | assert(u); |
633 | ||
634 | return state_translation_table[PATH(u)->state]; | |
635 | } | |
636 | ||
44a6b1b6 | 637 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
638 | assert(u); |
639 | ||
640 | return path_state_to_string(PATH(u)->state); | |
641 | } | |
642 | ||
718db961 LP |
643 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
644 | PathSpec *s = userdata; | |
645 | Path *p; | |
4b562198 | 646 | int changed; |
01f78473 | 647 | |
718db961 LP |
648 | assert(s); |
649 | assert(s->unit); | |
01f78473 LP |
650 | assert(fd >= 0); |
651 | ||
718db961 LP |
652 | p = PATH(s->unit); |
653 | ||
672028dc LP |
654 | if (p->state != PATH_WAITING && |
655 | p->state != PATH_RUNNING) | |
718db961 | 656 | return 0; |
01f78473 | 657 | |
ac155bb8 | 658 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 659 | |
01f78473 | 660 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 661 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
662 | break; |
663 | ||
664 | if (!s) { | |
665 | log_error("Got event on unknown fd."); | |
666 | goto fail; | |
667 | } | |
668 | ||
718db961 | 669 | changed = path_spec_fd_event(s, revents); |
4b562198 | 670 | if (changed < 0) |
01f78473 | 671 | goto fail; |
01f78473 | 672 | |
672028dc LP |
673 | /* If we are already running, then remember that one event was |
674 | * dispatched so that we restart the service only if something | |
675 | * actually changed on disk */ | |
676 | p->inotify_triggered = true; | |
677 | ||
672028dc LP |
678 | if (changed) |
679 | path_enter_running(p); | |
680 | else | |
ac3f50ca | 681 | path_enter_waiting(p, false, true); |
672028dc | 682 | |
718db961 | 683 | return 0; |
01f78473 LP |
684 | |
685 | fail: | |
cd43ca73 | 686 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 687 | return 0; |
01f78473 LP |
688 | } |
689 | ||
3ecaa09b LP |
690 | static void path_trigger_notify(Unit *u, Unit *other) { |
691 | Path *p = PATH(u); | |
01f78473 | 692 | |
3ecaa09b LP |
693 | assert(u); |
694 | assert(other); | |
01f78473 | 695 | |
3ecaa09b LP |
696 | /* Invoked whenever the unit we trigger changes state or gains |
697 | * or loses a job */ | |
01f78473 | 698 | |
3ecaa09b LP |
699 | if (other->load_state != UNIT_LOADED) |
700 | return; | |
01f78473 | 701 | |
3ecaa09b LP |
702 | if (p->state == PATH_RUNNING && |
703 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
79008bdd | 704 | log_unit_debug(UNIT(p)->id, |
3ecaa09b LP |
705 | "%s got notified about unit deactivation.", |
706 | UNIT(p)->id); | |
672028dc | 707 | |
3ecaa09b LP |
708 | /* Hmm, so inotify was triggered since the |
709 | * last activation, so I guess we need to | |
710 | * recheck what is going on. */ | |
711 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 712 | } |
01f78473 LP |
713 | } |
714 | ||
fdf20a31 | 715 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
716 | Path *p = PATH(u); |
717 | ||
718 | assert(p); | |
719 | ||
fdf20a31 | 720 | if (p->state == PATH_FAILED) |
5632e374 LP |
721 | path_set_state(p, PATH_DEAD); |
722 | ||
cd43ca73 | 723 | p->result = PATH_SUCCESS; |
5632e374 LP |
724 | } |
725 | ||
01f78473 LP |
726 | static const char* const path_state_table[_PATH_STATE_MAX] = { |
727 | [PATH_DEAD] = "dead", | |
728 | [PATH_WAITING] = "waiting", | |
729 | [PATH_RUNNING] = "running", | |
fdf20a31 | 730 | [PATH_FAILED] = "failed" |
01f78473 LP |
731 | }; |
732 | ||
733 | DEFINE_STRING_TABLE_LOOKUP(path_state, PathState); | |
734 | ||
735 | static const char* const path_type_table[_PATH_TYPE_MAX] = { | |
736 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 737 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 738 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 739 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 740 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
741 | }; |
742 | ||
743 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
744 | ||
cd43ca73 LP |
745 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
746 | [PATH_SUCCESS] = "success", | |
2c5859af | 747 | [PATH_FAILURE_RESOURCES] = "resources", |
cd43ca73 LP |
748 | }; |
749 | ||
750 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
751 | ||
01f78473 | 752 | const UnitVTable path_vtable = { |
7d17cfbc | 753 | .object_size = sizeof(Path), |
718db961 | 754 | |
f975e971 LP |
755 | .sections = |
756 | "Unit\0" | |
757 | "Path\0" | |
758 | "Install\0", | |
01f78473 | 759 | |
0e456f97 | 760 | .init = path_init, |
01f78473 LP |
761 | .done = path_done, |
762 | .load = path_load, | |
763 | ||
764 | .coldplug = path_coldplug, | |
765 | ||
766 | .dump = path_dump, | |
767 | ||
768 | .start = path_start, | |
769 | .stop = path_stop, | |
770 | ||
771 | .serialize = path_serialize, | |
772 | .deserialize_item = path_deserialize_item, | |
773 | ||
774 | .active_state = path_active_state, | |
775 | .sub_state_to_string = path_sub_state_to_string, | |
776 | ||
3ecaa09b LP |
777 | .trigger_notify = path_trigger_notify, |
778 | ||
fdf20a31 | 779 | .reset_failed = path_reset_failed, |
5632e374 | 780 | |
c4e2ceae | 781 | .bus_interface = "org.freedesktop.systemd1.Path", |
aec8de63 | 782 | .bus_vtable = bus_path_vtable |
01f78473 | 783 | }; |