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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 | |
7dfbe2e3 TG |
76 | (void) sd_event_source_set_description(s->event_source, "path"); |
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 | |
f2341e0a | 102 | r = log_warning_errno(errno, "Failed to add watch on %s: %s", s->path, errno == ENOSPC ? "too many watches" : strerror(-r)); |
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) { |
f2341e0a LP |
137 | r = log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", s->path); |
138 | /* either EACCESS or ENOENT */ | |
28a79bd2 ZJS |
139 | goto fail; |
140 | } | |
141 | ||
4b562198 MS |
142 | return 0; |
143 | ||
144 | fail: | |
718db961 | 145 | path_spec_unwatch(s); |
4b562198 | 146 | return r; |
0e456f97 LP |
147 | } |
148 | ||
718db961 LP |
149 | void path_spec_unwatch(PathSpec *s) { |
150 | assert(s); | |
62347bc2 | 151 | |
718db961 | 152 | s->event_source = sd_event_source_unref(s->event_source); |
03e334a1 | 153 | s->inotify_fd = safe_close(s->inotify_fd); |
62347bc2 LP |
154 | } |
155 | ||
718db961 | 156 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { |
0254e944 | 157 | union inotify_event_buffer buffer; |
4b562198 | 158 | struct inotify_event *e; |
f7c1ad4f | 159 | ssize_t l; |
4b562198 MS |
160 | int r = 0; |
161 | ||
718db961 | 162 | if (revents != EPOLLIN) { |
15f55e80 | 163 | log_error("Got invalid poll event on inotify."); |
a163db44 | 164 | return -EINVAL; |
4b562198 MS |
165 | } |
166 | ||
0254e944 | 167 | l = read(s->inotify_fd, &buffer, sizeof(buffer)); |
f7c1ad4f LP |
168 | if (l < 0) { |
169 | if (errno == EAGAIN || errno == EINTR) | |
170 | return 0; | |
4b562198 | 171 | |
4a62c710 | 172 | return log_error_errno(errno, "Failed to read inotify event: %m"); |
f7c1ad4f | 173 | } |
4b562198 | 174 | |
f7c1ad4f | 175 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
714d943f MS |
176 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && |
177 | s->primary_wd == e->wd) | |
4b562198 | 178 | r = 1; |
4b562198 | 179 | } |
a163db44 | 180 | |
4b562198 MS |
181 | return r; |
182 | } | |
183 | ||
57020a3a | 184 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
185 | bool good = false; |
186 | ||
187 | switch (s->type) { | |
188 | ||
189 | case PATH_EXISTS: | |
190 | good = access(s->path, F_OK) >= 0; | |
191 | break; | |
192 | ||
193 | case PATH_EXISTS_GLOB: | |
194 | good = glob_exists(s->path) > 0; | |
195 | break; | |
196 | ||
197 | case PATH_DIRECTORY_NOT_EMPTY: { | |
198 | int k; | |
199 | ||
200 | k = dir_is_empty(s->path); | |
201 | good = !(k == -ENOENT || k > 0); | |
202 | break; | |
203 | } | |
204 | ||
714d943f MS |
205 | case PATH_CHANGED: |
206 | case PATH_MODIFIED: { | |
4b562198 MS |
207 | bool b; |
208 | ||
209 | b = access(s->path, F_OK) >= 0; | |
210 | good = !initial && b != s->previous_exists; | |
211 | s->previous_exists = b; | |
212 | break; | |
213 | } | |
214 | ||
215 | default: | |
216 | ; | |
217 | } | |
218 | ||
219 | return good; | |
220 | } | |
221 | ||
57020a3a | 222 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
223 | int r; |
224 | ||
225 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
226 | return; | |
227 | ||
15f55e80 ZJS |
228 | r = mkdir_p_label(s->path, mode); |
229 | if (r < 0) | |
da927ba9 | 230 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
231 | } |
232 | ||
57020a3a | 233 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
234 | fprintf(f, |
235 | "%s%s: %s\n", | |
236 | prefix, | |
237 | path_type_to_string(s->type), | |
238 | s->path); | |
239 | } | |
240 | ||
57020a3a LP |
241 | void path_spec_done(PathSpec *s) { |
242 | assert(s); | |
4b562198 | 243 | assert(s->inotify_fd == -1); |
57020a3a | 244 | |
4b562198 MS |
245 | free(s->path); |
246 | } | |
247 | ||
248 | static void path_init(Unit *u) { | |
249 | Path *p = PATH(u); | |
250 | ||
251 | assert(u); | |
ac155bb8 | 252 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
253 | |
254 | p->directory_mode = 0755; | |
255 | } | |
256 | ||
74051b9b | 257 | void path_free_specs(Path *p) { |
01f78473 LP |
258 | PathSpec *s; |
259 | ||
260 | assert(p); | |
261 | ||
262 | while ((s = p->specs)) { | |
718db961 | 263 | path_spec_unwatch(s); |
71fda00f | 264 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 265 | path_spec_done(s); |
01f78473 LP |
266 | free(s); |
267 | } | |
268 | } | |
269 | ||
74051b9b LP |
270 | static void path_done(Unit *u) { |
271 | Path *p = PATH(u); | |
272 | ||
273 | assert(p); | |
274 | ||
74051b9b LP |
275 | path_free_specs(p); |
276 | } | |
277 | ||
a57f7e2c | 278 | static int path_add_mount_links(Path *p) { |
01f78473 LP |
279 | PathSpec *s; |
280 | int r; | |
281 | ||
282 | assert(p); | |
01f78473 LP |
283 | |
284 | LIST_FOREACH(spec, s, p->specs) { | |
a57f7e2c | 285 | r = unit_require_mounts_for(UNIT(p), s->path); |
e0207c8d | 286 | if (r < 0) |
01f78473 | 287 | return r; |
e0207c8d | 288 | } |
01f78473 LP |
289 | |
290 | return 0; | |
291 | } | |
292 | ||
293 | static int path_verify(Path *p) { | |
294 | assert(p); | |
295 | ||
1124fe6f | 296 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
297 | return 0; |
298 | ||
299 | if (!p->specs) { | |
f2341e0a | 300 | log_unit_error(UNIT(p), "Path unit lacks path setting. Refusing."); |
01f78473 LP |
301 | return -EINVAL; |
302 | } | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
6c155fe3 LP |
307 | static int path_add_default_dependencies(Path *p) { |
308 | int r; | |
309 | ||
310 | assert(p); | |
311 | ||
e3d84721 LP |
312 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, |
313 | SPECIAL_PATHS_TARGET, NULL, true); | |
314 | if (r < 0) | |
315 | return r; | |
2a77d31d | 316 | |
b2c23da8 | 317 | if (UNIT(p)->manager->running_as == MANAGER_SYSTEM) { |
e0207c8d ZJS |
318 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, |
319 | SPECIAL_SYSINIT_TARGET, NULL, true); | |
320 | if (r < 0) | |
6c155fe3 | 321 | return r; |
2a77d31d | 322 | } |
6c155fe3 | 323 | |
e0207c8d ZJS |
324 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, |
325 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
6c155fe3 LP |
326 | } |
327 | ||
01f78473 LP |
328 | static int path_load(Unit *u) { |
329 | Path *p = PATH(u); | |
330 | int r; | |
331 | ||
332 | assert(u); | |
ac155bb8 | 333 | assert(u->load_state == UNIT_STUB); |
01f78473 | 334 | |
e0207c8d ZJS |
335 | r = unit_load_fragment_and_dropin(u); |
336 | if (r < 0) | |
01f78473 LP |
337 | return r; |
338 | ||
ac155bb8 | 339 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 340 | |
3ecaa09b | 341 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { |
57020a3a LP |
342 | Unit *x; |
343 | ||
344 | r = unit_load_related_unit(u, ".service", &x); | |
345 | if (r < 0) | |
01f78473 LP |
346 | return r; |
347 | ||
3ecaa09b LP |
348 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); |
349 | if (r < 0) | |
350 | return r; | |
57020a3a LP |
351 | } |
352 | ||
e0207c8d ZJS |
353 | r = path_add_mount_links(p); |
354 | if (r < 0) | |
01f78473 | 355 | return r; |
a40eb732 | 356 | |
e0207c8d ZJS |
357 | if (UNIT(p)->default_dependencies) { |
358 | r = path_add_default_dependencies(p); | |
359 | if (r < 0) | |
a40eb732 | 360 | return r; |
e0207c8d | 361 | } |
01f78473 LP |
362 | } |
363 | ||
364 | return path_verify(p); | |
365 | } | |
366 | ||
367 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
368 | Path *p = PATH(u); | |
3ecaa09b | 369 | Unit *trigger; |
01f78473 LP |
370 | PathSpec *s; |
371 | ||
e364ad06 LP |
372 | assert(p); |
373 | assert(f); | |
01f78473 | 374 | |
3ecaa09b LP |
375 | trigger = UNIT_TRIGGER(u); |
376 | ||
01f78473 LP |
377 | fprintf(f, |
378 | "%sPath State: %s\n" | |
cd43ca73 | 379 | "%sResult: %s\n" |
0e456f97 LP |
380 | "%sUnit: %s\n" |
381 | "%sMakeDirectory: %s\n" | |
382 | "%sDirectoryMode: %04o\n", | |
01f78473 | 383 | prefix, path_state_to_string(p->state), |
cd43ca73 | 384 | prefix, path_result_to_string(p->result), |
3ecaa09b | 385 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
386 | prefix, yes_no(p->make_directory), |
387 | prefix, p->directory_mode); | |
01f78473 LP |
388 | |
389 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 390 | path_spec_dump(s, f, prefix); |
01f78473 LP |
391 | } |
392 | ||
393 | static void path_unwatch(Path *p) { | |
394 | PathSpec *s; | |
395 | ||
396 | assert(p); | |
397 | ||
398 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 399 | path_spec_unwatch(s); |
01f78473 LP |
400 | } |
401 | ||
402 | static int path_watch(Path *p) { | |
403 | int r; | |
404 | PathSpec *s; | |
405 | ||
406 | assert(p); | |
407 | ||
e0207c8d | 408 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 409 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 410 | if (r < 0) |
01f78473 | 411 | return r; |
e0207c8d | 412 | } |
01f78473 LP |
413 | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static void path_set_state(Path *p, PathState state) { | |
418 | PathState old_state; | |
419 | assert(p); | |
420 | ||
421 | old_state = p->state; | |
422 | p->state = state; | |
423 | ||
672028dc LP |
424 | if (state != PATH_WAITING && |
425 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
426 | path_unwatch(p); |
427 | ||
428 | if (state != old_state) | |
3541bf1f | 429 | log_unit_debug(UNIT(p), "Changed %s -> %s", path_state_to_string(old_state), path_state_to_string(state)); |
01f78473 | 430 | |
e2f3b44c | 431 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
432 | } |
433 | ||
ac3f50ca | 434 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 | 435 | |
be847e82 | 436 | static int path_coldplug(Unit *u) { |
01f78473 LP |
437 | Path *p = PATH(u); |
438 | ||
439 | assert(p); | |
440 | assert(p->state == PATH_DEAD); | |
441 | ||
442 | if (p->deserialized_state != p->state) { | |
443 | ||
444 | if (p->deserialized_state == PATH_WAITING || | |
be847e82 LP |
445 | p->deserialized_state == PATH_RUNNING) |
446 | path_enter_waiting(p, true, true); | |
447 | else | |
01f78473 LP |
448 | path_set_state(p, p->deserialized_state); |
449 | } | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
cd43ca73 | 454 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
455 | assert(p); |
456 | ||
cd43ca73 LP |
457 | if (f != PATH_SUCCESS) |
458 | p->result = f; | |
01f78473 | 459 | |
cd43ca73 | 460 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
461 | } |
462 | ||
463 | static void path_enter_running(Path *p) { | |
718db961 | 464 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
01f78473 | 465 | int r; |
398ef8ba | 466 | |
01f78473 | 467 | assert(p); |
3ecaa09b | 468 | |
ba3e67a7 | 469 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 470 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
471 | return; |
472 | ||
3ecaa09b | 473 | r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)), |
e0207c8d ZJS |
474 | JOB_REPLACE, true, &error, NULL); |
475 | if (r < 0) | |
01f78473 LP |
476 | goto fail; |
477 | ||
672028dc LP |
478 | p->inotify_triggered = false; |
479 | ||
e0207c8d ZJS |
480 | r = path_watch(p); |
481 | if (r < 0) | |
672028dc LP |
482 | goto fail; |
483 | ||
01f78473 LP |
484 | path_set_state(p, PATH_RUNNING); |
485 | return; | |
486 | ||
487 | fail: | |
f2341e0a | 488 | log_unit_warning(UNIT(p), "Failed to queue unit startup job: %s", bus_error_message(&error, r)); |
cd43ca73 | 489 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
490 | } |
491 | ||
ac3f50ca | 492 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 493 | PathSpec *s; |
01f78473 LP |
494 | bool good = false; |
495 | ||
ac3f50ca | 496 | assert(p); |
672028dc | 497 | |
01f78473 | 498 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 499 | good = path_spec_check_good(s, initial); |
01f78473 LP |
500 | |
501 | if (good) | |
502 | break; | |
503 | } | |
504 | ||
ac3f50ca LP |
505 | return good; |
506 | } | |
01f78473 | 507 | |
ac3f50ca LP |
508 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
509 | int r; | |
0595f9a1 | 510 | |
ac3f50ca LP |
511 | if (recheck) |
512 | if (path_check_good(p, initial)) { | |
f2341e0a | 513 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
514 | path_enter_running(p); |
515 | return; | |
516 | } | |
517 | ||
e0207c8d ZJS |
518 | r = path_watch(p); |
519 | if (r < 0) | |
ac3f50ca LP |
520 | goto fail; |
521 | ||
522 | /* Hmm, so now we have created inotify watches, but the file | |
523 | * might have appeared/been removed by now, so we must | |
524 | * recheck */ | |
525 | ||
526 | if (recheck) | |
527 | if (path_check_good(p, false)) { | |
f2341e0a | 528 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
529 | path_enter_running(p); |
530 | return; | |
531 | } | |
01f78473 LP |
532 | |
533 | path_set_state(p, PATH_WAITING); | |
534 | return; | |
535 | ||
536 | fail: | |
f2341e0a | 537 | log_unit_warning_errno(UNIT(p), r, "Failed to enter waiting state: %m"); |
cd43ca73 | 538 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
539 | } |
540 | ||
0e456f97 LP |
541 | static void path_mkdir(Path *p) { |
542 | PathSpec *s; | |
543 | ||
544 | assert(p); | |
545 | ||
546 | if (!p->make_directory) | |
547 | return; | |
548 | ||
4b562198 | 549 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 550 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
551 | } |
552 | ||
01f78473 LP |
553 | static int path_start(Unit *u) { |
554 | Path *p = PATH(u); | |
555 | ||
556 | assert(p); | |
fdf20a31 | 557 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 558 | |
3ecaa09b | 559 | if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED) |
01f78473 LP |
560 | return -ENOENT; |
561 | ||
0e456f97 LP |
562 | path_mkdir(p); |
563 | ||
cd43ca73 | 564 | p->result = PATH_SUCCESS; |
ac3f50ca | 565 | path_enter_waiting(p, true, true); |
00dc5d76 | 566 | |
82a2b6bb | 567 | return 1; |
01f78473 LP |
568 | } |
569 | ||
570 | static int path_stop(Unit *u) { | |
571 | Path *p = PATH(u); | |
572 | ||
573 | assert(p); | |
574 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
575 | ||
cd43ca73 | 576 | path_enter_dead(p, PATH_SUCCESS); |
82a2b6bb | 577 | return 1; |
01f78473 LP |
578 | } |
579 | ||
580 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
581 | Path *p = PATH(u); | |
582 | ||
583 | assert(u); | |
584 | assert(f); | |
585 | assert(fds); | |
586 | ||
587 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 588 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
589 | |
590 | return 0; | |
591 | } | |
592 | ||
593 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
594 | Path *p = PATH(u); | |
595 | ||
596 | assert(u); | |
597 | assert(key); | |
598 | assert(value); | |
599 | assert(fds); | |
600 | ||
601 | if (streq(key, "state")) { | |
602 | PathState state; | |
603 | ||
e0207c8d ZJS |
604 | state = path_state_from_string(value); |
605 | if (state < 0) | |
f2341e0a | 606 | log_unit_debug(u, "Failed to parse state value: %s", value); |
01f78473 LP |
607 | else |
608 | p->deserialized_state = state; | |
cd43ca73 LP |
609 | |
610 | } else if (streq(key, "result")) { | |
611 | PathResult f; | |
612 | ||
613 | f = path_result_from_string(value); | |
614 | if (f < 0) | |
f2341e0a | 615 | log_unit_debug(u, "Failed to parse result value: %s", value); |
cd43ca73 LP |
616 | else if (f != PATH_SUCCESS) |
617 | p->result = f; | |
618 | ||
01f78473 | 619 | } else |
f2341e0a | 620 | log_unit_debug(u, "Unknown serialization key: %s", key); |
01f78473 LP |
621 | |
622 | return 0; | |
623 | } | |
624 | ||
44a6b1b6 | 625 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
626 | assert(u); |
627 | ||
628 | return state_translation_table[PATH(u)->state]; | |
629 | } | |
630 | ||
44a6b1b6 | 631 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
632 | assert(u); |
633 | ||
634 | return path_state_to_string(PATH(u)->state); | |
635 | } | |
636 | ||
718db961 LP |
637 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
638 | PathSpec *s = userdata; | |
639 | Path *p; | |
4b562198 | 640 | int changed; |
01f78473 | 641 | |
718db961 LP |
642 | assert(s); |
643 | assert(s->unit); | |
01f78473 LP |
644 | assert(fd >= 0); |
645 | ||
718db961 LP |
646 | p = PATH(s->unit); |
647 | ||
672028dc LP |
648 | if (p->state != PATH_WAITING && |
649 | p->state != PATH_RUNNING) | |
718db961 | 650 | return 0; |
01f78473 | 651 | |
ac155bb8 | 652 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 653 | |
01f78473 | 654 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 655 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
656 | break; |
657 | ||
658 | if (!s) { | |
659 | log_error("Got event on unknown fd."); | |
660 | goto fail; | |
661 | } | |
662 | ||
718db961 | 663 | changed = path_spec_fd_event(s, revents); |
4b562198 | 664 | if (changed < 0) |
01f78473 | 665 | goto fail; |
01f78473 | 666 | |
672028dc LP |
667 | /* If we are already running, then remember that one event was |
668 | * dispatched so that we restart the service only if something | |
669 | * actually changed on disk */ | |
670 | p->inotify_triggered = true; | |
671 | ||
672028dc LP |
672 | if (changed) |
673 | path_enter_running(p); | |
674 | else | |
ac3f50ca | 675 | path_enter_waiting(p, false, true); |
672028dc | 676 | |
718db961 | 677 | return 0; |
01f78473 LP |
678 | |
679 | fail: | |
cd43ca73 | 680 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 681 | return 0; |
01f78473 LP |
682 | } |
683 | ||
3ecaa09b LP |
684 | static void path_trigger_notify(Unit *u, Unit *other) { |
685 | Path *p = PATH(u); | |
01f78473 | 686 | |
3ecaa09b LP |
687 | assert(u); |
688 | assert(other); | |
01f78473 | 689 | |
3ecaa09b LP |
690 | /* Invoked whenever the unit we trigger changes state or gains |
691 | * or loses a job */ | |
01f78473 | 692 | |
3ecaa09b LP |
693 | if (other->load_state != UNIT_LOADED) |
694 | return; | |
01f78473 | 695 | |
3ecaa09b LP |
696 | if (p->state == PATH_RUNNING && |
697 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
f2341e0a | 698 | log_unit_debug(UNIT(p), "Got notified about unit deactivation."); |
672028dc | 699 | |
3ecaa09b LP |
700 | /* Hmm, so inotify was triggered since the |
701 | * last activation, so I guess we need to | |
702 | * recheck what is going on. */ | |
703 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 704 | } |
01f78473 LP |
705 | } |
706 | ||
fdf20a31 | 707 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
708 | Path *p = PATH(u); |
709 | ||
710 | assert(p); | |
711 | ||
fdf20a31 | 712 | if (p->state == PATH_FAILED) |
5632e374 LP |
713 | path_set_state(p, PATH_DEAD); |
714 | ||
cd43ca73 | 715 | p->result = PATH_SUCCESS; |
5632e374 LP |
716 | } |
717 | ||
01f78473 LP |
718 | static const char* const path_type_table[_PATH_TYPE_MAX] = { |
719 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 720 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 721 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 722 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 723 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
724 | }; |
725 | ||
726 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
727 | ||
cd43ca73 LP |
728 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
729 | [PATH_SUCCESS] = "success", | |
2c5859af | 730 | [PATH_FAILURE_RESOURCES] = "resources", |
cd43ca73 LP |
731 | }; |
732 | ||
733 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
734 | ||
01f78473 | 735 | const UnitVTable path_vtable = { |
7d17cfbc | 736 | .object_size = sizeof(Path), |
718db961 | 737 | |
f975e971 LP |
738 | .sections = |
739 | "Unit\0" | |
740 | "Path\0" | |
741 | "Install\0", | |
01f78473 | 742 | |
0e456f97 | 743 | .init = path_init, |
01f78473 LP |
744 | .done = path_done, |
745 | .load = path_load, | |
746 | ||
747 | .coldplug = path_coldplug, | |
748 | ||
749 | .dump = path_dump, | |
750 | ||
751 | .start = path_start, | |
752 | .stop = path_stop, | |
753 | ||
754 | .serialize = path_serialize, | |
755 | .deserialize_item = path_deserialize_item, | |
756 | ||
757 | .active_state = path_active_state, | |
758 | .sub_state_to_string = path_sub_state_to_string, | |
759 | ||
3ecaa09b LP |
760 | .trigger_notify = path_trigger_notify, |
761 | ||
fdf20a31 | 762 | .reset_failed = path_reset_failed, |
5632e374 | 763 | |
aec8de63 | 764 | .bus_vtable = bus_path_vtable |
01f78473 | 765 | }; |