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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 | ||
01f78473 | 22 | #include <errno.h> |
07630cea LP |
23 | #include <sys/epoll.h> |
24 | #include <sys/inotify.h> | |
01f78473 LP |
25 | #include <unistd.h> |
26 | ||
07630cea LP |
27 | #include "bus-error.h" |
28 | #include "bus-util.h" | |
01f78473 | 29 | #include "dbus-path.h" |
f8c16f42 | 30 | #include "macro.h" |
07630cea LP |
31 | #include "mkdir.h" |
32 | #include "special.h" | |
33 | #include "string-util.h" | |
34 | #include "unit-name.h" | |
35 | #include "unit.h" | |
36 | #include "path.h" | |
01f78473 LP |
37 | |
38 | static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { | |
39 | [PATH_DEAD] = UNIT_INACTIVE, | |
40 | [PATH_WAITING] = UNIT_ACTIVE, | |
41 | [PATH_RUNNING] = UNIT_ACTIVE, | |
fdf20a31 | 42 | [PATH_FAILED] = UNIT_FAILED |
01f78473 LP |
43 | }; |
44 | ||
718db961 LP |
45 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
46 | ||
47 | int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) { | |
57020a3a | 48 | |
4b562198 MS |
49 | static const int flags_table[_PATH_TYPE_MAX] = { |
50 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
51 | [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
52 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
e9223856 | 53 | [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 |
54 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO |
55 | }; | |
56 | ||
57 | bool exists = false; | |
bc41f93e | 58 | char *slash, *oldslash = NULL; |
4b562198 | 59 | int r; |
0e456f97 | 60 | |
4b562198 | 61 | assert(s); |
718db961 LP |
62 | assert(s->unit); |
63 | assert(handler); | |
0e456f97 | 64 | |
718db961 | 65 | path_spec_unwatch(s); |
4b562198 | 66 | |
f8c16f42 ZJS |
67 | s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
68 | if (s->inotify_fd < 0) { | |
4b562198 MS |
69 | r = -errno; |
70 | goto fail; | |
71 | } | |
72 | ||
151b9b96 | 73 | r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s); |
f8c16f42 | 74 | if (r < 0) |
4b562198 | 75 | goto fail; |
4b562198 | 76 | |
7dfbe2e3 TG |
77 | (void) sd_event_source_set_description(s->event_source, "path"); |
78 | ||
bc41f93e | 79 | /* This assumes the path was passed through path_kill_slashes()! */ |
4b562198 | 80 | |
180d6802 MS |
81 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { |
82 | char *cut = NULL; | |
4b562198 | 83 | int flags; |
bc41f93e ZJS |
84 | char tmp; |
85 | ||
86 | if (slash) { | |
180d6802 MS |
87 | cut = slash + (slash == s->path); |
88 | tmp = *cut; | |
89 | *cut = '\0'; | |
90 | ||
bc41f93e | 91 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; |
180d6802 | 92 | } else |
bc41f93e | 93 | flags = flags_table[s->type]; |
4b562198 | 94 | |
180d6802 | 95 | r = inotify_add_watch(s->inotify_fd, s->path, flags); |
bc41f93e | 96 | if (r < 0) { |
180d6802 MS |
97 | if (errno == EACCES || errno == ENOENT) { |
98 | if (cut) | |
99 | *cut = tmp; | |
bc41f93e | 100 | break; |
180d6802 | 101 | } |
4b562198 | 102 | |
f2341e0a | 103 | r = log_warning_errno(errno, "Failed to add watch on %s: %s", s->path, errno == ENOSPC ? "too many watches" : strerror(-r)); |
180d6802 MS |
104 | if (cut) |
105 | *cut = tmp; | |
28a79bd2 | 106 | goto fail; |
bc41f93e ZJS |
107 | } else { |
108 | exists = true; | |
109 | ||
110 | /* Path exists, we don't need to watch parent | |
111 | too closely. */ | |
112 | if (oldslash) { | |
180d6802 MS |
113 | char *cut2 = oldslash + (oldslash == s->path); |
114 | char tmp2 = *cut2; | |
115 | *cut2 = '\0'; | |
bc41f93e | 116 | |
180d6802 | 117 | inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); |
bc41f93e ZJS |
118 | /* Error is ignored, the worst can happen is |
119 | we get spurious events. */ | |
120 | ||
180d6802 | 121 | *cut2 = tmp2; |
bc41f93e | 122 | } |
28a79bd2 | 123 | } |
bc41f93e | 124 | |
180d6802 MS |
125 | if (cut) |
126 | *cut = tmp; | |
127 | ||
128 | if (slash) | |
bc41f93e | 129 | oldslash = slash; |
180d6802 | 130 | else { |
bc41f93e ZJS |
131 | /* whole path has been iterated over */ |
132 | s->primary_wd = r; | |
133 | break; | |
134 | } | |
135 | } | |
136 | ||
28a79bd2 | 137 | if (!exists) { |
f2341e0a LP |
138 | r = log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", s->path); |
139 | /* 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) { | |
f2341e0a | 301 | log_unit_error(UNIT(p), "Path unit lacks path setting. Refusing."); |
01f78473 LP |
302 | return -EINVAL; |
303 | } | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
6c155fe3 LP |
308 | static int path_add_default_dependencies(Path *p) { |
309 | int r; | |
310 | ||
311 | assert(p); | |
312 | ||
e3d84721 LP |
313 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, |
314 | SPECIAL_PATHS_TARGET, NULL, true); | |
315 | if (r < 0) | |
316 | return r; | |
2a77d31d | 317 | |
b2c23da8 | 318 | if (UNIT(p)->manager->running_as == MANAGER_SYSTEM) { |
e0207c8d ZJS |
319 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, |
320 | SPECIAL_SYSINIT_TARGET, NULL, true); | |
321 | if (r < 0) | |
6c155fe3 | 322 | return r; |
2a77d31d | 323 | } |
6c155fe3 | 324 | |
e0207c8d ZJS |
325 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, |
326 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
6c155fe3 LP |
327 | } |
328 | ||
01f78473 LP |
329 | static int path_load(Unit *u) { |
330 | Path *p = PATH(u); | |
331 | int r; | |
332 | ||
333 | assert(u); | |
ac155bb8 | 334 | assert(u->load_state == UNIT_STUB); |
01f78473 | 335 | |
e0207c8d ZJS |
336 | r = unit_load_fragment_and_dropin(u); |
337 | if (r < 0) | |
01f78473 LP |
338 | return r; |
339 | ||
ac155bb8 | 340 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 341 | |
3ecaa09b | 342 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { |
57020a3a LP |
343 | Unit *x; |
344 | ||
345 | r = unit_load_related_unit(u, ".service", &x); | |
346 | if (r < 0) | |
01f78473 LP |
347 | return r; |
348 | ||
3ecaa09b LP |
349 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); |
350 | if (r < 0) | |
351 | return r; | |
57020a3a LP |
352 | } |
353 | ||
e0207c8d ZJS |
354 | r = path_add_mount_links(p); |
355 | if (r < 0) | |
01f78473 | 356 | return r; |
a40eb732 | 357 | |
e0207c8d ZJS |
358 | if (UNIT(p)->default_dependencies) { |
359 | r = path_add_default_dependencies(p); | |
360 | if (r < 0) | |
a40eb732 | 361 | return r; |
e0207c8d | 362 | } |
01f78473 LP |
363 | } |
364 | ||
365 | return path_verify(p); | |
366 | } | |
367 | ||
368 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
369 | Path *p = PATH(u); | |
3ecaa09b | 370 | Unit *trigger; |
01f78473 LP |
371 | PathSpec *s; |
372 | ||
e364ad06 LP |
373 | assert(p); |
374 | assert(f); | |
01f78473 | 375 | |
3ecaa09b LP |
376 | trigger = UNIT_TRIGGER(u); |
377 | ||
01f78473 LP |
378 | fprintf(f, |
379 | "%sPath State: %s\n" | |
cd43ca73 | 380 | "%sResult: %s\n" |
0e456f97 LP |
381 | "%sUnit: %s\n" |
382 | "%sMakeDirectory: %s\n" | |
383 | "%sDirectoryMode: %04o\n", | |
01f78473 | 384 | prefix, path_state_to_string(p->state), |
cd43ca73 | 385 | prefix, path_result_to_string(p->result), |
3ecaa09b | 386 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
387 | prefix, yes_no(p->make_directory), |
388 | prefix, p->directory_mode); | |
01f78473 LP |
389 | |
390 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 391 | path_spec_dump(s, f, prefix); |
01f78473 LP |
392 | } |
393 | ||
394 | static void path_unwatch(Path *p) { | |
395 | PathSpec *s; | |
396 | ||
397 | assert(p); | |
398 | ||
399 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 400 | path_spec_unwatch(s); |
01f78473 LP |
401 | } |
402 | ||
403 | static int path_watch(Path *p) { | |
404 | int r; | |
405 | PathSpec *s; | |
406 | ||
407 | assert(p); | |
408 | ||
e0207c8d | 409 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 410 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 411 | if (r < 0) |
01f78473 | 412 | return r; |
e0207c8d | 413 | } |
01f78473 LP |
414 | |
415 | return 0; | |
416 | } | |
417 | ||
418 | static void path_set_state(Path *p, PathState state) { | |
419 | PathState old_state; | |
420 | assert(p); | |
421 | ||
422 | old_state = p->state; | |
423 | p->state = state; | |
424 | ||
672028dc LP |
425 | if (state != PATH_WAITING && |
426 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
427 | path_unwatch(p); |
428 | ||
429 | if (state != old_state) | |
3541bf1f | 430 | log_unit_debug(UNIT(p), "Changed %s -> %s", path_state_to_string(old_state), path_state_to_string(state)); |
01f78473 | 431 | |
e2f3b44c | 432 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
433 | } |
434 | ||
ac3f50ca | 435 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 | 436 | |
be847e82 | 437 | static int path_coldplug(Unit *u) { |
01f78473 LP |
438 | Path *p = PATH(u); |
439 | ||
440 | assert(p); | |
441 | assert(p->state == PATH_DEAD); | |
442 | ||
443 | if (p->deserialized_state != p->state) { | |
444 | ||
445 | if (p->deserialized_state == PATH_WAITING || | |
be847e82 LP |
446 | p->deserialized_state == PATH_RUNNING) |
447 | path_enter_waiting(p, true, true); | |
448 | else | |
01f78473 LP |
449 | path_set_state(p, p->deserialized_state); |
450 | } | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
cd43ca73 | 455 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
456 | assert(p); |
457 | ||
cd43ca73 LP |
458 | if (f != PATH_SUCCESS) |
459 | p->result = f; | |
01f78473 | 460 | |
cd43ca73 | 461 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
462 | } |
463 | ||
464 | static void path_enter_running(Path *p) { | |
718db961 | 465 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
01f78473 | 466 | int r; |
398ef8ba | 467 | |
01f78473 | 468 | assert(p); |
3ecaa09b | 469 | |
ba3e67a7 | 470 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 471 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
472 | return; |
473 | ||
3ecaa09b | 474 | r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)), |
e0207c8d ZJS |
475 | JOB_REPLACE, true, &error, NULL); |
476 | if (r < 0) | |
01f78473 LP |
477 | goto fail; |
478 | ||
672028dc LP |
479 | p->inotify_triggered = false; |
480 | ||
e0207c8d ZJS |
481 | r = path_watch(p); |
482 | if (r < 0) | |
672028dc LP |
483 | goto fail; |
484 | ||
01f78473 LP |
485 | path_set_state(p, PATH_RUNNING); |
486 | return; | |
487 | ||
488 | fail: | |
f2341e0a | 489 | log_unit_warning(UNIT(p), "Failed to queue unit startup job: %s", bus_error_message(&error, r)); |
cd43ca73 | 490 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
491 | } |
492 | ||
ac3f50ca | 493 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 494 | PathSpec *s; |
01f78473 LP |
495 | bool good = false; |
496 | ||
ac3f50ca | 497 | assert(p); |
672028dc | 498 | |
01f78473 | 499 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 500 | good = path_spec_check_good(s, initial); |
01f78473 LP |
501 | |
502 | if (good) | |
503 | break; | |
504 | } | |
505 | ||
ac3f50ca LP |
506 | return good; |
507 | } | |
01f78473 | 508 | |
ac3f50ca LP |
509 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
510 | int r; | |
0595f9a1 | 511 | |
ac3f50ca LP |
512 | if (recheck) |
513 | if (path_check_good(p, initial)) { | |
f2341e0a | 514 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
515 | path_enter_running(p); |
516 | return; | |
517 | } | |
518 | ||
e0207c8d ZJS |
519 | r = path_watch(p); |
520 | if (r < 0) | |
ac3f50ca LP |
521 | goto fail; |
522 | ||
523 | /* Hmm, so now we have created inotify watches, but the file | |
524 | * might have appeared/been removed by now, so we must | |
525 | * recheck */ | |
526 | ||
527 | if (recheck) | |
528 | if (path_check_good(p, false)) { | |
f2341e0a | 529 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
530 | path_enter_running(p); |
531 | return; | |
532 | } | |
01f78473 LP |
533 | |
534 | path_set_state(p, PATH_WAITING); | |
535 | return; | |
536 | ||
537 | fail: | |
f2341e0a | 538 | log_unit_warning_errno(UNIT(p), r, "Failed to enter waiting state: %m"); |
cd43ca73 | 539 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
540 | } |
541 | ||
0e456f97 LP |
542 | static void path_mkdir(Path *p) { |
543 | PathSpec *s; | |
544 | ||
545 | assert(p); | |
546 | ||
547 | if (!p->make_directory) | |
548 | return; | |
549 | ||
4b562198 | 550 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 551 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
552 | } |
553 | ||
01f78473 LP |
554 | static int path_start(Unit *u) { |
555 | Path *p = PATH(u); | |
556 | ||
557 | assert(p); | |
fdf20a31 | 558 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 559 | |
3ecaa09b | 560 | if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED) |
01f78473 LP |
561 | return -ENOENT; |
562 | ||
0e456f97 LP |
563 | path_mkdir(p); |
564 | ||
cd43ca73 | 565 | p->result = PATH_SUCCESS; |
ac3f50ca | 566 | path_enter_waiting(p, true, true); |
00dc5d76 | 567 | |
82a2b6bb | 568 | return 1; |
01f78473 LP |
569 | } |
570 | ||
571 | static int path_stop(Unit *u) { | |
572 | Path *p = PATH(u); | |
573 | ||
574 | assert(p); | |
575 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
576 | ||
cd43ca73 | 577 | path_enter_dead(p, PATH_SUCCESS); |
82a2b6bb | 578 | return 1; |
01f78473 LP |
579 | } |
580 | ||
581 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
582 | Path *p = PATH(u); | |
583 | ||
584 | assert(u); | |
585 | assert(f); | |
586 | assert(fds); | |
587 | ||
588 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 589 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
590 | |
591 | return 0; | |
592 | } | |
593 | ||
594 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
595 | Path *p = PATH(u); | |
596 | ||
597 | assert(u); | |
598 | assert(key); | |
599 | assert(value); | |
600 | assert(fds); | |
601 | ||
602 | if (streq(key, "state")) { | |
603 | PathState state; | |
604 | ||
e0207c8d ZJS |
605 | state = path_state_from_string(value); |
606 | if (state < 0) | |
f2341e0a | 607 | log_unit_debug(u, "Failed to parse state value: %s", value); |
01f78473 LP |
608 | else |
609 | p->deserialized_state = state; | |
cd43ca73 LP |
610 | |
611 | } else if (streq(key, "result")) { | |
612 | PathResult f; | |
613 | ||
614 | f = path_result_from_string(value); | |
615 | if (f < 0) | |
f2341e0a | 616 | log_unit_debug(u, "Failed to parse result value: %s", value); |
cd43ca73 LP |
617 | else if (f != PATH_SUCCESS) |
618 | p->result = f; | |
619 | ||
01f78473 | 620 | } else |
f2341e0a | 621 | log_unit_debug(u, "Unknown serialization key: %s", key); |
01f78473 LP |
622 | |
623 | return 0; | |
624 | } | |
625 | ||
44a6b1b6 | 626 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
627 | assert(u); |
628 | ||
629 | return state_translation_table[PATH(u)->state]; | |
630 | } | |
631 | ||
44a6b1b6 | 632 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
633 | assert(u); |
634 | ||
635 | return path_state_to_string(PATH(u)->state); | |
636 | } | |
637 | ||
718db961 LP |
638 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
639 | PathSpec *s = userdata; | |
640 | Path *p; | |
4b562198 | 641 | int changed; |
01f78473 | 642 | |
718db961 LP |
643 | assert(s); |
644 | assert(s->unit); | |
01f78473 LP |
645 | assert(fd >= 0); |
646 | ||
718db961 LP |
647 | p = PATH(s->unit); |
648 | ||
672028dc LP |
649 | if (p->state != PATH_WAITING && |
650 | p->state != PATH_RUNNING) | |
718db961 | 651 | return 0; |
01f78473 | 652 | |
ac155bb8 | 653 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 654 | |
01f78473 | 655 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 656 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
657 | break; |
658 | ||
659 | if (!s) { | |
660 | log_error("Got event on unknown fd."); | |
661 | goto fail; | |
662 | } | |
663 | ||
718db961 | 664 | changed = path_spec_fd_event(s, revents); |
4b562198 | 665 | if (changed < 0) |
01f78473 | 666 | goto fail; |
01f78473 | 667 | |
672028dc LP |
668 | /* If we are already running, then remember that one event was |
669 | * dispatched so that we restart the service only if something | |
670 | * actually changed on disk */ | |
671 | p->inotify_triggered = true; | |
672 | ||
672028dc LP |
673 | if (changed) |
674 | path_enter_running(p); | |
675 | else | |
ac3f50ca | 676 | path_enter_waiting(p, false, true); |
672028dc | 677 | |
718db961 | 678 | return 0; |
01f78473 LP |
679 | |
680 | fail: | |
cd43ca73 | 681 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 682 | return 0; |
01f78473 LP |
683 | } |
684 | ||
3ecaa09b LP |
685 | static void path_trigger_notify(Unit *u, Unit *other) { |
686 | Path *p = PATH(u); | |
01f78473 | 687 | |
3ecaa09b LP |
688 | assert(u); |
689 | assert(other); | |
01f78473 | 690 | |
3ecaa09b LP |
691 | /* Invoked whenever the unit we trigger changes state or gains |
692 | * or loses a job */ | |
01f78473 | 693 | |
3ecaa09b LP |
694 | if (other->load_state != UNIT_LOADED) |
695 | return; | |
01f78473 | 696 | |
3ecaa09b LP |
697 | if (p->state == PATH_RUNNING && |
698 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
f2341e0a | 699 | log_unit_debug(UNIT(p), "Got notified about unit deactivation."); |
672028dc | 700 | |
3ecaa09b LP |
701 | /* Hmm, so inotify was triggered since the |
702 | * last activation, so I guess we need to | |
703 | * recheck what is going on. */ | |
704 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 705 | } |
01f78473 LP |
706 | } |
707 | ||
fdf20a31 | 708 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
709 | Path *p = PATH(u); |
710 | ||
711 | assert(p); | |
712 | ||
fdf20a31 | 713 | if (p->state == PATH_FAILED) |
5632e374 LP |
714 | path_set_state(p, PATH_DEAD); |
715 | ||
cd43ca73 | 716 | p->result = PATH_SUCCESS; |
5632e374 LP |
717 | } |
718 | ||
01f78473 LP |
719 | static const char* const path_type_table[_PATH_TYPE_MAX] = { |
720 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 721 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 722 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 723 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 724 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
725 | }; |
726 | ||
727 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
728 | ||
cd43ca73 LP |
729 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
730 | [PATH_SUCCESS] = "success", | |
2c5859af | 731 | [PATH_FAILURE_RESOURCES] = "resources", |
cd43ca73 LP |
732 | }; |
733 | ||
734 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
735 | ||
01f78473 | 736 | const UnitVTable path_vtable = { |
7d17cfbc | 737 | .object_size = sizeof(Path), |
718db961 | 738 | |
f975e971 LP |
739 | .sections = |
740 | "Unit\0" | |
741 | "Path\0" | |
742 | "Install\0", | |
01f78473 | 743 | |
0e456f97 | 744 | .init = path_init, |
01f78473 LP |
745 | .done = path_done, |
746 | .load = path_load, | |
747 | ||
748 | .coldplug = path_coldplug, | |
749 | ||
750 | .dump = path_dump, | |
751 | ||
752 | .start = path_start, | |
753 | .stop = path_stop, | |
754 | ||
755 | .serialize = path_serialize, | |
756 | .deserialize_item = path_deserialize_item, | |
757 | ||
758 | .active_state = path_active_state, | |
759 | .sub_state_to_string = path_sub_state_to_string, | |
760 | ||
3ecaa09b LP |
761 | .trigger_notify = path_trigger_notify, |
762 | ||
fdf20a31 | 763 | .reset_failed = path_reset_failed, |
5632e374 | 764 | |
aec8de63 | 765 | .bus_vtable = bus_path_vtable |
01f78473 | 766 | }; |