]>
Commit | Line | Data |
---|---|---|
d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
01f78473 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
01f78473 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
01f78473 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
01f78473 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
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" |
3ffd4af2 | 30 | #include "fd-util.h" |
7d50b32a | 31 | #include "glob-util.h" |
f8c16f42 | 32 | #include "macro.h" |
07630cea | 33 | #include "mkdir.h" |
3ffd4af2 | 34 | #include "path.h" |
07630cea | 35 | #include "special.h" |
8fcde012 | 36 | #include "stat-util.h" |
8b43440b | 37 | #include "string-table.h" |
07630cea LP |
38 | #include "string-util.h" |
39 | #include "unit-name.h" | |
40 | #include "unit.h" | |
01f78473 LP |
41 | |
42 | static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { | |
43 | [PATH_DEAD] = UNIT_INACTIVE, | |
44 | [PATH_WAITING] = UNIT_ACTIVE, | |
45 | [PATH_RUNNING] = UNIT_ACTIVE, | |
fdf20a31 | 46 | [PATH_FAILED] = UNIT_FAILED |
01f78473 LP |
47 | }; |
48 | ||
718db961 LP |
49 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
50 | ||
51 | int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) { | |
57020a3a | 52 | |
4b562198 MS |
53 | static const int flags_table[_PATH_TYPE_MAX] = { |
54 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
55 | [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
56 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
e9223856 | 57 | [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 |
58 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO |
59 | }; | |
60 | ||
61 | bool exists = false; | |
bc41f93e | 62 | char *slash, *oldslash = NULL; |
4b562198 | 63 | int r; |
0e456f97 | 64 | |
4b562198 | 65 | assert(s); |
718db961 LP |
66 | assert(s->unit); |
67 | assert(handler); | |
0e456f97 | 68 | |
718db961 | 69 | path_spec_unwatch(s); |
4b562198 | 70 | |
f8c16f42 ZJS |
71 | s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
72 | if (s->inotify_fd < 0) { | |
4b562198 MS |
73 | r = -errno; |
74 | goto fail; | |
75 | } | |
76 | ||
151b9b96 | 77 | r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s); |
f8c16f42 | 78 | if (r < 0) |
4b562198 | 79 | goto fail; |
4b562198 | 80 | |
7dfbe2e3 TG |
81 | (void) sd_event_source_set_description(s->event_source, "path"); |
82 | ||
bc41f93e | 83 | /* This assumes the path was passed through path_kill_slashes()! */ |
4b562198 | 84 | |
180d6802 MS |
85 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { |
86 | char *cut = NULL; | |
4b562198 | 87 | int flags; |
bc41f93e ZJS |
88 | char tmp; |
89 | ||
90 | if (slash) { | |
180d6802 MS |
91 | cut = slash + (slash == s->path); |
92 | tmp = *cut; | |
93 | *cut = '\0'; | |
94 | ||
bc41f93e | 95 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; |
180d6802 | 96 | } else |
bc41f93e | 97 | flags = flags_table[s->type]; |
4b562198 | 98 | |
180d6802 | 99 | r = inotify_add_watch(s->inotify_fd, s->path, flags); |
bc41f93e | 100 | if (r < 0) { |
180d6802 MS |
101 | if (errno == EACCES || errno == ENOENT) { |
102 | if (cut) | |
103 | *cut = tmp; | |
bc41f93e | 104 | break; |
180d6802 | 105 | } |
4b562198 | 106 | |
f2341e0a | 107 | r = log_warning_errno(errno, "Failed to add watch on %s: %s", s->path, errno == ENOSPC ? "too many watches" : strerror(-r)); |
180d6802 MS |
108 | if (cut) |
109 | *cut = tmp; | |
28a79bd2 | 110 | goto fail; |
bc41f93e ZJS |
111 | } else { |
112 | exists = true; | |
113 | ||
114 | /* Path exists, we don't need to watch parent | |
115 | too closely. */ | |
116 | if (oldslash) { | |
180d6802 MS |
117 | char *cut2 = oldslash + (oldslash == s->path); |
118 | char tmp2 = *cut2; | |
119 | *cut2 = '\0'; | |
bc41f93e | 120 | |
180d6802 | 121 | inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); |
bc41f93e ZJS |
122 | /* Error is ignored, the worst can happen is |
123 | we get spurious events. */ | |
124 | ||
180d6802 | 125 | *cut2 = tmp2; |
bc41f93e | 126 | } |
28a79bd2 | 127 | } |
bc41f93e | 128 | |
180d6802 MS |
129 | if (cut) |
130 | *cut = tmp; | |
131 | ||
132 | if (slash) | |
bc41f93e | 133 | oldslash = slash; |
180d6802 | 134 | else { |
bc41f93e ZJS |
135 | /* whole path has been iterated over */ |
136 | s->primary_wd = r; | |
137 | break; | |
138 | } | |
139 | } | |
140 | ||
28a79bd2 | 141 | if (!exists) { |
f2341e0a LP |
142 | r = log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", s->path); |
143 | /* either EACCESS or ENOENT */ | |
28a79bd2 ZJS |
144 | goto fail; |
145 | } | |
146 | ||
4b562198 MS |
147 | return 0; |
148 | ||
149 | fail: | |
718db961 | 150 | path_spec_unwatch(s); |
4b562198 | 151 | return r; |
0e456f97 LP |
152 | } |
153 | ||
718db961 LP |
154 | void path_spec_unwatch(PathSpec *s) { |
155 | assert(s); | |
62347bc2 | 156 | |
718db961 | 157 | s->event_source = sd_event_source_unref(s->event_source); |
03e334a1 | 158 | s->inotify_fd = safe_close(s->inotify_fd); |
62347bc2 LP |
159 | } |
160 | ||
718db961 | 161 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { |
0254e944 | 162 | union inotify_event_buffer buffer; |
4b562198 | 163 | struct inotify_event *e; |
f7c1ad4f | 164 | ssize_t l; |
4b562198 MS |
165 | int r = 0; |
166 | ||
718db961 | 167 | if (revents != EPOLLIN) { |
15f55e80 | 168 | log_error("Got invalid poll event on inotify."); |
a163db44 | 169 | return -EINVAL; |
4b562198 MS |
170 | } |
171 | ||
0254e944 | 172 | l = read(s->inotify_fd, &buffer, sizeof(buffer)); |
f7c1ad4f LP |
173 | if (l < 0) { |
174 | if (errno == EAGAIN || errno == EINTR) | |
175 | return 0; | |
4b562198 | 176 | |
4a62c710 | 177 | return log_error_errno(errno, "Failed to read inotify event: %m"); |
f7c1ad4f | 178 | } |
4b562198 | 179 | |
f7c1ad4f | 180 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
714d943f MS |
181 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && |
182 | s->primary_wd == e->wd) | |
4b562198 | 183 | r = 1; |
4b562198 | 184 | } |
a163db44 | 185 | |
4b562198 MS |
186 | return r; |
187 | } | |
188 | ||
57020a3a | 189 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
190 | bool good = false; |
191 | ||
192 | switch (s->type) { | |
193 | ||
194 | case PATH_EXISTS: | |
195 | good = access(s->path, F_OK) >= 0; | |
196 | break; | |
197 | ||
198 | case PATH_EXISTS_GLOB: | |
199 | good = glob_exists(s->path) > 0; | |
200 | break; | |
201 | ||
202 | case PATH_DIRECTORY_NOT_EMPTY: { | |
203 | int k; | |
204 | ||
205 | k = dir_is_empty(s->path); | |
206 | good = !(k == -ENOENT || k > 0); | |
207 | break; | |
208 | } | |
209 | ||
714d943f MS |
210 | case PATH_CHANGED: |
211 | case PATH_MODIFIED: { | |
4b562198 MS |
212 | bool b; |
213 | ||
214 | b = access(s->path, F_OK) >= 0; | |
215 | good = !initial && b != s->previous_exists; | |
216 | s->previous_exists = b; | |
217 | break; | |
218 | } | |
219 | ||
220 | default: | |
221 | ; | |
222 | } | |
223 | ||
224 | return good; | |
225 | } | |
226 | ||
57020a3a | 227 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
228 | int r; |
229 | ||
230 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
231 | return; | |
232 | ||
15f55e80 ZJS |
233 | r = mkdir_p_label(s->path, mode); |
234 | if (r < 0) | |
da927ba9 | 235 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
236 | } |
237 | ||
57020a3a | 238 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
239 | fprintf(f, |
240 | "%s%s: %s\n", | |
241 | prefix, | |
242 | path_type_to_string(s->type), | |
243 | s->path); | |
244 | } | |
245 | ||
57020a3a LP |
246 | void path_spec_done(PathSpec *s) { |
247 | assert(s); | |
4b562198 | 248 | assert(s->inotify_fd == -1); |
57020a3a | 249 | |
4b562198 MS |
250 | free(s->path); |
251 | } | |
252 | ||
253 | static void path_init(Unit *u) { | |
254 | Path *p = PATH(u); | |
255 | ||
256 | assert(u); | |
ac155bb8 | 257 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
258 | |
259 | p->directory_mode = 0755; | |
260 | } | |
261 | ||
74051b9b | 262 | void path_free_specs(Path *p) { |
01f78473 LP |
263 | PathSpec *s; |
264 | ||
265 | assert(p); | |
266 | ||
267 | while ((s = p->specs)) { | |
718db961 | 268 | path_spec_unwatch(s); |
71fda00f | 269 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 270 | path_spec_done(s); |
01f78473 LP |
271 | free(s); |
272 | } | |
273 | } | |
274 | ||
74051b9b LP |
275 | static void path_done(Unit *u) { |
276 | Path *p = PATH(u); | |
277 | ||
278 | assert(p); | |
279 | ||
74051b9b LP |
280 | path_free_specs(p); |
281 | } | |
282 | ||
a57f7e2c | 283 | static int path_add_mount_links(Path *p) { |
01f78473 LP |
284 | PathSpec *s; |
285 | int r; | |
286 | ||
287 | assert(p); | |
01f78473 LP |
288 | |
289 | LIST_FOREACH(spec, s, p->specs) { | |
a57f7e2c | 290 | r = unit_require_mounts_for(UNIT(p), s->path); |
e0207c8d | 291 | if (r < 0) |
01f78473 | 292 | return r; |
e0207c8d | 293 | } |
01f78473 LP |
294 | |
295 | return 0; | |
296 | } | |
297 | ||
298 | static int path_verify(Path *p) { | |
299 | assert(p); | |
300 | ||
1124fe6f | 301 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
302 | return 0; |
303 | ||
304 | if (!p->specs) { | |
f2341e0a | 305 | log_unit_error(UNIT(p), "Path unit lacks path setting. Refusing."); |
01f78473 LP |
306 | return -EINVAL; |
307 | } | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
6c155fe3 LP |
312 | static int path_add_default_dependencies(Path *p) { |
313 | int r; | |
314 | ||
315 | assert(p); | |
316 | ||
e3d84721 LP |
317 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, |
318 | SPECIAL_PATHS_TARGET, NULL, true); | |
319 | if (r < 0) | |
320 | return r; | |
2a77d31d | 321 | |
b2c23da8 | 322 | if (UNIT(p)->manager->running_as == MANAGER_SYSTEM) { |
e0207c8d ZJS |
323 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, |
324 | SPECIAL_SYSINIT_TARGET, NULL, true); | |
325 | if (r < 0) | |
6c155fe3 | 326 | return r; |
2a77d31d | 327 | } |
6c155fe3 | 328 | |
e0207c8d ZJS |
329 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, |
330 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
6c155fe3 LP |
331 | } |
332 | ||
01f78473 LP |
333 | static int path_load(Unit *u) { |
334 | Path *p = PATH(u); | |
335 | int r; | |
336 | ||
337 | assert(u); | |
ac155bb8 | 338 | assert(u->load_state == UNIT_STUB); |
01f78473 | 339 | |
e0207c8d ZJS |
340 | r = unit_load_fragment_and_dropin(u); |
341 | if (r < 0) | |
01f78473 LP |
342 | return r; |
343 | ||
ac155bb8 | 344 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 345 | |
3ecaa09b | 346 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { |
57020a3a LP |
347 | Unit *x; |
348 | ||
349 | r = unit_load_related_unit(u, ".service", &x); | |
350 | if (r < 0) | |
01f78473 LP |
351 | return r; |
352 | ||
3ecaa09b LP |
353 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); |
354 | if (r < 0) | |
355 | return r; | |
57020a3a LP |
356 | } |
357 | ||
e0207c8d ZJS |
358 | r = path_add_mount_links(p); |
359 | if (r < 0) | |
01f78473 | 360 | return r; |
a40eb732 | 361 | |
e0207c8d ZJS |
362 | if (UNIT(p)->default_dependencies) { |
363 | r = path_add_default_dependencies(p); | |
364 | if (r < 0) | |
a40eb732 | 365 | return r; |
e0207c8d | 366 | } |
01f78473 LP |
367 | } |
368 | ||
369 | return path_verify(p); | |
370 | } | |
371 | ||
372 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
373 | Path *p = PATH(u); | |
3ecaa09b | 374 | Unit *trigger; |
01f78473 LP |
375 | PathSpec *s; |
376 | ||
e364ad06 LP |
377 | assert(p); |
378 | assert(f); | |
01f78473 | 379 | |
3ecaa09b LP |
380 | trigger = UNIT_TRIGGER(u); |
381 | ||
01f78473 LP |
382 | fprintf(f, |
383 | "%sPath State: %s\n" | |
cd43ca73 | 384 | "%sResult: %s\n" |
0e456f97 LP |
385 | "%sUnit: %s\n" |
386 | "%sMakeDirectory: %s\n" | |
387 | "%sDirectoryMode: %04o\n", | |
01f78473 | 388 | prefix, path_state_to_string(p->state), |
cd43ca73 | 389 | prefix, path_result_to_string(p->result), |
3ecaa09b | 390 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
391 | prefix, yes_no(p->make_directory), |
392 | prefix, p->directory_mode); | |
01f78473 LP |
393 | |
394 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 395 | path_spec_dump(s, f, prefix); |
01f78473 LP |
396 | } |
397 | ||
398 | static void path_unwatch(Path *p) { | |
399 | PathSpec *s; | |
400 | ||
401 | assert(p); | |
402 | ||
403 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 404 | path_spec_unwatch(s); |
01f78473 LP |
405 | } |
406 | ||
407 | static int path_watch(Path *p) { | |
408 | int r; | |
409 | PathSpec *s; | |
410 | ||
411 | assert(p); | |
412 | ||
e0207c8d | 413 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 414 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 415 | if (r < 0) |
01f78473 | 416 | return r; |
e0207c8d | 417 | } |
01f78473 LP |
418 | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static void path_set_state(Path *p, PathState state) { | |
423 | PathState old_state; | |
424 | assert(p); | |
425 | ||
426 | old_state = p->state; | |
427 | p->state = state; | |
428 | ||
672028dc LP |
429 | if (state != PATH_WAITING && |
430 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
431 | path_unwatch(p); |
432 | ||
433 | if (state != old_state) | |
3541bf1f | 434 | log_unit_debug(UNIT(p), "Changed %s -> %s", path_state_to_string(old_state), path_state_to_string(state)); |
01f78473 | 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: | |
f2341e0a | 493 | log_unit_warning(UNIT(p), "Failed to queue unit startup job: %s", bus_error_message(&error, r)); |
cd43ca73 | 494 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
495 | } |
496 | ||
ac3f50ca | 497 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 498 | PathSpec *s; |
01f78473 LP |
499 | bool good = false; |
500 | ||
ac3f50ca | 501 | assert(p); |
672028dc | 502 | |
01f78473 | 503 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 504 | good = path_spec_check_good(s, initial); |
01f78473 LP |
505 | |
506 | if (good) | |
507 | break; | |
508 | } | |
509 | ||
ac3f50ca LP |
510 | return good; |
511 | } | |
01f78473 | 512 | |
ac3f50ca LP |
513 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
514 | int r; | |
0595f9a1 | 515 | |
ac3f50ca LP |
516 | if (recheck) |
517 | if (path_check_good(p, initial)) { | |
f2341e0a | 518 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
519 | path_enter_running(p); |
520 | return; | |
521 | } | |
522 | ||
e0207c8d ZJS |
523 | r = path_watch(p); |
524 | if (r < 0) | |
ac3f50ca LP |
525 | goto fail; |
526 | ||
527 | /* Hmm, so now we have created inotify watches, but the file | |
528 | * might have appeared/been removed by now, so we must | |
529 | * recheck */ | |
530 | ||
531 | if (recheck) | |
532 | if (path_check_good(p, false)) { | |
f2341e0a | 533 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
534 | path_enter_running(p); |
535 | return; | |
536 | } | |
01f78473 LP |
537 | |
538 | path_set_state(p, PATH_WAITING); | |
539 | return; | |
540 | ||
541 | fail: | |
f2341e0a | 542 | log_unit_warning_errno(UNIT(p), r, "Failed to enter waiting state: %m"); |
cd43ca73 | 543 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
544 | } |
545 | ||
0e456f97 LP |
546 | static void path_mkdir(Path *p) { |
547 | PathSpec *s; | |
548 | ||
549 | assert(p); | |
550 | ||
551 | if (!p->make_directory) | |
552 | return; | |
553 | ||
4b562198 | 554 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 555 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
556 | } |
557 | ||
01f78473 LP |
558 | static int path_start(Unit *u) { |
559 | Path *p = PATH(u); | |
560 | ||
561 | assert(p); | |
fdf20a31 | 562 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 563 | |
3ecaa09b | 564 | if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED) |
01f78473 LP |
565 | return -ENOENT; |
566 | ||
0e456f97 LP |
567 | path_mkdir(p); |
568 | ||
cd43ca73 | 569 | p->result = PATH_SUCCESS; |
ac3f50ca | 570 | path_enter_waiting(p, true, true); |
00dc5d76 | 571 | |
82a2b6bb | 572 | return 1; |
01f78473 LP |
573 | } |
574 | ||
575 | static int path_stop(Unit *u) { | |
576 | Path *p = PATH(u); | |
577 | ||
578 | assert(p); | |
579 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
580 | ||
cd43ca73 | 581 | path_enter_dead(p, PATH_SUCCESS); |
82a2b6bb | 582 | return 1; |
01f78473 LP |
583 | } |
584 | ||
585 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
586 | Path *p = PATH(u); | |
587 | ||
588 | assert(u); | |
589 | assert(f); | |
590 | assert(fds); | |
591 | ||
592 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 593 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
594 | |
595 | return 0; | |
596 | } | |
597 | ||
598 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
599 | Path *p = PATH(u); | |
600 | ||
601 | assert(u); | |
602 | assert(key); | |
603 | assert(value); | |
604 | assert(fds); | |
605 | ||
606 | if (streq(key, "state")) { | |
607 | PathState state; | |
608 | ||
e0207c8d ZJS |
609 | state = path_state_from_string(value); |
610 | if (state < 0) | |
f2341e0a | 611 | log_unit_debug(u, "Failed to parse state value: %s", value); |
01f78473 LP |
612 | else |
613 | p->deserialized_state = state; | |
cd43ca73 LP |
614 | |
615 | } else if (streq(key, "result")) { | |
616 | PathResult f; | |
617 | ||
618 | f = path_result_from_string(value); | |
619 | if (f < 0) | |
f2341e0a | 620 | log_unit_debug(u, "Failed to parse result value: %s", value); |
cd43ca73 LP |
621 | else if (f != PATH_SUCCESS) |
622 | p->result = f; | |
623 | ||
01f78473 | 624 | } else |
f2341e0a | 625 | log_unit_debug(u, "Unknown serialization key: %s", key); |
01f78473 LP |
626 | |
627 | return 0; | |
628 | } | |
629 | ||
44a6b1b6 | 630 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
631 | assert(u); |
632 | ||
633 | return state_translation_table[PATH(u)->state]; | |
634 | } | |
635 | ||
44a6b1b6 | 636 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
637 | assert(u); |
638 | ||
639 | return path_state_to_string(PATH(u)->state); | |
640 | } | |
641 | ||
718db961 LP |
642 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
643 | PathSpec *s = userdata; | |
644 | Path *p; | |
4b562198 | 645 | int changed; |
01f78473 | 646 | |
718db961 LP |
647 | assert(s); |
648 | assert(s->unit); | |
01f78473 LP |
649 | assert(fd >= 0); |
650 | ||
718db961 LP |
651 | p = PATH(s->unit); |
652 | ||
672028dc LP |
653 | if (p->state != PATH_WAITING && |
654 | p->state != PATH_RUNNING) | |
718db961 | 655 | return 0; |
01f78473 | 656 | |
ac155bb8 | 657 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 658 | |
01f78473 | 659 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 660 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
661 | break; |
662 | ||
663 | if (!s) { | |
664 | log_error("Got event on unknown fd."); | |
665 | goto fail; | |
666 | } | |
667 | ||
718db961 | 668 | changed = path_spec_fd_event(s, revents); |
4b562198 | 669 | if (changed < 0) |
01f78473 | 670 | goto fail; |
01f78473 | 671 | |
672028dc LP |
672 | /* If we are already running, then remember that one event was |
673 | * dispatched so that we restart the service only if something | |
674 | * actually changed on disk */ | |
675 | p->inotify_triggered = true; | |
676 | ||
672028dc LP |
677 | if (changed) |
678 | path_enter_running(p); | |
679 | else | |
ac3f50ca | 680 | path_enter_waiting(p, false, true); |
672028dc | 681 | |
718db961 | 682 | return 0; |
01f78473 LP |
683 | |
684 | fail: | |
cd43ca73 | 685 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 686 | return 0; |
01f78473 LP |
687 | } |
688 | ||
3ecaa09b LP |
689 | static void path_trigger_notify(Unit *u, Unit *other) { |
690 | Path *p = PATH(u); | |
01f78473 | 691 | |
3ecaa09b LP |
692 | assert(u); |
693 | assert(other); | |
01f78473 | 694 | |
3ecaa09b LP |
695 | /* Invoked whenever the unit we trigger changes state or gains |
696 | * or loses a job */ | |
01f78473 | 697 | |
3ecaa09b LP |
698 | if (other->load_state != UNIT_LOADED) |
699 | return; | |
01f78473 | 700 | |
3ecaa09b LP |
701 | if (p->state == PATH_RUNNING && |
702 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
f2341e0a | 703 | log_unit_debug(UNIT(p), "Got notified about unit deactivation."); |
672028dc | 704 | |
3ecaa09b LP |
705 | /* Hmm, so inotify was triggered since the |
706 | * last activation, so I guess we need to | |
707 | * recheck what is going on. */ | |
708 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 709 | } |
01f78473 LP |
710 | } |
711 | ||
fdf20a31 | 712 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
713 | Path *p = PATH(u); |
714 | ||
715 | assert(p); | |
716 | ||
fdf20a31 | 717 | if (p->state == PATH_FAILED) |
5632e374 LP |
718 | path_set_state(p, PATH_DEAD); |
719 | ||
cd43ca73 | 720 | p->result = PATH_SUCCESS; |
5632e374 LP |
721 | } |
722 | ||
01f78473 LP |
723 | static const char* const path_type_table[_PATH_TYPE_MAX] = { |
724 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 725 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 726 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 727 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 728 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
729 | }; |
730 | ||
731 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
732 | ||
cd43ca73 LP |
733 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
734 | [PATH_SUCCESS] = "success", | |
2c5859af | 735 | [PATH_FAILURE_RESOURCES] = "resources", |
cd43ca73 LP |
736 | }; |
737 | ||
738 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
739 | ||
01f78473 | 740 | const UnitVTable path_vtable = { |
7d17cfbc | 741 | .object_size = sizeof(Path), |
718db961 | 742 | |
f975e971 LP |
743 | .sections = |
744 | "Unit\0" | |
745 | "Path\0" | |
746 | "Install\0", | |
01f78473 | 747 | |
0e456f97 | 748 | .init = path_init, |
01f78473 LP |
749 | .done = path_done, |
750 | .load = path_load, | |
751 | ||
752 | .coldplug = path_coldplug, | |
753 | ||
754 | .dump = path_dump, | |
755 | ||
756 | .start = path_start, | |
757 | .stop = path_stop, | |
758 | ||
759 | .serialize = path_serialize, | |
760 | .deserialize_item = path_deserialize_item, | |
761 | ||
762 | .active_state = path_active_state, | |
763 | .sub_state_to_string = path_sub_state_to_string, | |
764 | ||
3ecaa09b LP |
765 | .trigger_notify = path_trigger_notify, |
766 | ||
fdf20a31 | 767 | .reset_failed = path_reset_failed, |
5632e374 | 768 | |
aec8de63 | 769 | .bus_vtable = bus_path_vtable |
01f78473 | 770 | }; |