]>
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" |
f8c16f42 | 31 | #include "macro.h" |
07630cea | 32 | #include "mkdir.h" |
3ffd4af2 | 33 | #include "path.h" |
07630cea | 34 | #include "special.h" |
8fcde012 | 35 | #include "stat-util.h" |
8b43440b | 36 | #include "string-table.h" |
07630cea LP |
37 | #include "string-util.h" |
38 | #include "unit-name.h" | |
39 | #include "unit.h" | |
01f78473 LP |
40 | |
41 | static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { | |
42 | [PATH_DEAD] = UNIT_INACTIVE, | |
43 | [PATH_WAITING] = UNIT_ACTIVE, | |
44 | [PATH_RUNNING] = UNIT_ACTIVE, | |
fdf20a31 | 45 | [PATH_FAILED] = UNIT_FAILED |
01f78473 LP |
46 | }; |
47 | ||
718db961 LP |
48 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
49 | ||
50 | int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) { | |
57020a3a | 51 | |
4b562198 MS |
52 | static const int flags_table[_PATH_TYPE_MAX] = { |
53 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
54 | [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
55 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
e9223856 | 56 | [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 |
57 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO |
58 | }; | |
59 | ||
60 | bool exists = false; | |
bc41f93e | 61 | char *slash, *oldslash = NULL; |
4b562198 | 62 | int r; |
0e456f97 | 63 | |
4b562198 | 64 | assert(s); |
718db961 LP |
65 | assert(s->unit); |
66 | assert(handler); | |
0e456f97 | 67 | |
718db961 | 68 | path_spec_unwatch(s); |
4b562198 | 69 | |
f8c16f42 ZJS |
70 | s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
71 | if (s->inotify_fd < 0) { | |
4b562198 MS |
72 | r = -errno; |
73 | goto fail; | |
74 | } | |
75 | ||
151b9b96 | 76 | r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s); |
f8c16f42 | 77 | if (r < 0) |
4b562198 | 78 | goto fail; |
4b562198 | 79 | |
7dfbe2e3 TG |
80 | (void) sd_event_source_set_description(s->event_source, "path"); |
81 | ||
bc41f93e | 82 | /* This assumes the path was passed through path_kill_slashes()! */ |
4b562198 | 83 | |
180d6802 MS |
84 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { |
85 | char *cut = NULL; | |
4b562198 | 86 | int flags; |
bc41f93e ZJS |
87 | char tmp; |
88 | ||
89 | if (slash) { | |
180d6802 MS |
90 | cut = slash + (slash == s->path); |
91 | tmp = *cut; | |
92 | *cut = '\0'; | |
93 | ||
bc41f93e | 94 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; |
180d6802 | 95 | } else |
bc41f93e | 96 | flags = flags_table[s->type]; |
4b562198 | 97 | |
180d6802 | 98 | r = inotify_add_watch(s->inotify_fd, s->path, flags); |
bc41f93e | 99 | if (r < 0) { |
180d6802 MS |
100 | if (errno == EACCES || errno == ENOENT) { |
101 | if (cut) | |
102 | *cut = tmp; | |
bc41f93e | 103 | break; |
180d6802 | 104 | } |
4b562198 | 105 | |
f2341e0a | 106 | r = log_warning_errno(errno, "Failed to add watch on %s: %s", s->path, errno == ENOSPC ? "too many watches" : strerror(-r)); |
180d6802 MS |
107 | if (cut) |
108 | *cut = tmp; | |
28a79bd2 | 109 | goto fail; |
bc41f93e ZJS |
110 | } else { |
111 | exists = true; | |
112 | ||
113 | /* Path exists, we don't need to watch parent | |
114 | too closely. */ | |
115 | if (oldslash) { | |
180d6802 MS |
116 | char *cut2 = oldslash + (oldslash == s->path); |
117 | char tmp2 = *cut2; | |
118 | *cut2 = '\0'; | |
bc41f93e | 119 | |
180d6802 | 120 | inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); |
bc41f93e ZJS |
121 | /* Error is ignored, the worst can happen is |
122 | we get spurious events. */ | |
123 | ||
180d6802 | 124 | *cut2 = tmp2; |
bc41f93e | 125 | } |
28a79bd2 | 126 | } |
bc41f93e | 127 | |
180d6802 MS |
128 | if (cut) |
129 | *cut = tmp; | |
130 | ||
131 | if (slash) | |
bc41f93e | 132 | oldslash = slash; |
180d6802 | 133 | else { |
bc41f93e ZJS |
134 | /* whole path has been iterated over */ |
135 | s->primary_wd = r; | |
136 | break; | |
137 | } | |
138 | } | |
139 | ||
28a79bd2 | 140 | if (!exists) { |
f2341e0a LP |
141 | r = log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", s->path); |
142 | /* either EACCESS or ENOENT */ | |
28a79bd2 ZJS |
143 | goto fail; |
144 | } | |
145 | ||
4b562198 MS |
146 | return 0; |
147 | ||
148 | fail: | |
718db961 | 149 | path_spec_unwatch(s); |
4b562198 | 150 | return r; |
0e456f97 LP |
151 | } |
152 | ||
718db961 LP |
153 | void path_spec_unwatch(PathSpec *s) { |
154 | assert(s); | |
62347bc2 | 155 | |
718db961 | 156 | s->event_source = sd_event_source_unref(s->event_source); |
03e334a1 | 157 | s->inotify_fd = safe_close(s->inotify_fd); |
62347bc2 LP |
158 | } |
159 | ||
718db961 | 160 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { |
0254e944 | 161 | union inotify_event_buffer buffer; |
4b562198 | 162 | struct inotify_event *e; |
f7c1ad4f | 163 | ssize_t l; |
4b562198 MS |
164 | int r = 0; |
165 | ||
718db961 | 166 | if (revents != EPOLLIN) { |
15f55e80 | 167 | log_error("Got invalid poll event on inotify."); |
a163db44 | 168 | return -EINVAL; |
4b562198 MS |
169 | } |
170 | ||
0254e944 | 171 | l = read(s->inotify_fd, &buffer, sizeof(buffer)); |
f7c1ad4f LP |
172 | if (l < 0) { |
173 | if (errno == EAGAIN || errno == EINTR) | |
174 | return 0; | |
4b562198 | 175 | |
4a62c710 | 176 | return log_error_errno(errno, "Failed to read inotify event: %m"); |
f7c1ad4f | 177 | } |
4b562198 | 178 | |
f7c1ad4f | 179 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
714d943f MS |
180 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && |
181 | s->primary_wd == e->wd) | |
4b562198 | 182 | r = 1; |
4b562198 | 183 | } |
a163db44 | 184 | |
4b562198 MS |
185 | return r; |
186 | } | |
187 | ||
57020a3a | 188 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
189 | bool good = false; |
190 | ||
191 | switch (s->type) { | |
192 | ||
193 | case PATH_EXISTS: | |
194 | good = access(s->path, F_OK) >= 0; | |
195 | break; | |
196 | ||
197 | case PATH_EXISTS_GLOB: | |
198 | good = glob_exists(s->path) > 0; | |
199 | break; | |
200 | ||
201 | case PATH_DIRECTORY_NOT_EMPTY: { | |
202 | int k; | |
203 | ||
204 | k = dir_is_empty(s->path); | |
205 | good = !(k == -ENOENT || k > 0); | |
206 | break; | |
207 | } | |
208 | ||
714d943f MS |
209 | case PATH_CHANGED: |
210 | case PATH_MODIFIED: { | |
4b562198 MS |
211 | bool b; |
212 | ||
213 | b = access(s->path, F_OK) >= 0; | |
214 | good = !initial && b != s->previous_exists; | |
215 | s->previous_exists = b; | |
216 | break; | |
217 | } | |
218 | ||
219 | default: | |
220 | ; | |
221 | } | |
222 | ||
223 | return good; | |
224 | } | |
225 | ||
57020a3a | 226 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
227 | int r; |
228 | ||
229 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
230 | return; | |
231 | ||
15f55e80 ZJS |
232 | r = mkdir_p_label(s->path, mode); |
233 | if (r < 0) | |
da927ba9 | 234 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
235 | } |
236 | ||
57020a3a | 237 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
238 | fprintf(f, |
239 | "%s%s: %s\n", | |
240 | prefix, | |
241 | path_type_to_string(s->type), | |
242 | s->path); | |
243 | } | |
244 | ||
57020a3a LP |
245 | void path_spec_done(PathSpec *s) { |
246 | assert(s); | |
4b562198 | 247 | assert(s->inotify_fd == -1); |
57020a3a | 248 | |
4b562198 MS |
249 | free(s->path); |
250 | } | |
251 | ||
252 | static void path_init(Unit *u) { | |
253 | Path *p = PATH(u); | |
254 | ||
255 | assert(u); | |
ac155bb8 | 256 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
257 | |
258 | p->directory_mode = 0755; | |
259 | } | |
260 | ||
74051b9b | 261 | void path_free_specs(Path *p) { |
01f78473 LP |
262 | PathSpec *s; |
263 | ||
264 | assert(p); | |
265 | ||
266 | while ((s = p->specs)) { | |
718db961 | 267 | path_spec_unwatch(s); |
71fda00f | 268 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 269 | path_spec_done(s); |
01f78473 LP |
270 | free(s); |
271 | } | |
272 | } | |
273 | ||
74051b9b LP |
274 | static void path_done(Unit *u) { |
275 | Path *p = PATH(u); | |
276 | ||
277 | assert(p); | |
278 | ||
74051b9b LP |
279 | path_free_specs(p); |
280 | } | |
281 | ||
a57f7e2c | 282 | static int path_add_mount_links(Path *p) { |
01f78473 LP |
283 | PathSpec *s; |
284 | int r; | |
285 | ||
286 | assert(p); | |
01f78473 LP |
287 | |
288 | LIST_FOREACH(spec, s, p->specs) { | |
a57f7e2c | 289 | r = unit_require_mounts_for(UNIT(p), s->path); |
e0207c8d | 290 | if (r < 0) |
01f78473 | 291 | return r; |
e0207c8d | 292 | } |
01f78473 LP |
293 | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static int path_verify(Path *p) { | |
298 | assert(p); | |
299 | ||
1124fe6f | 300 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
301 | return 0; |
302 | ||
303 | if (!p->specs) { | |
f2341e0a | 304 | log_unit_error(UNIT(p), "Path unit lacks path setting. Refusing."); |
01f78473 LP |
305 | return -EINVAL; |
306 | } | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
6c155fe3 LP |
311 | static int path_add_default_dependencies(Path *p) { |
312 | int r; | |
313 | ||
314 | assert(p); | |
315 | ||
e3d84721 LP |
316 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, |
317 | SPECIAL_PATHS_TARGET, NULL, true); | |
318 | if (r < 0) | |
319 | return r; | |
2a77d31d | 320 | |
b2c23da8 | 321 | if (UNIT(p)->manager->running_as == MANAGER_SYSTEM) { |
e0207c8d ZJS |
322 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, |
323 | SPECIAL_SYSINIT_TARGET, NULL, true); | |
324 | if (r < 0) | |
6c155fe3 | 325 | return r; |
2a77d31d | 326 | } |
6c155fe3 | 327 | |
e0207c8d ZJS |
328 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, |
329 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
6c155fe3 LP |
330 | } |
331 | ||
01f78473 LP |
332 | static int path_load(Unit *u) { |
333 | Path *p = PATH(u); | |
334 | int r; | |
335 | ||
336 | assert(u); | |
ac155bb8 | 337 | assert(u->load_state == UNIT_STUB); |
01f78473 | 338 | |
e0207c8d ZJS |
339 | r = unit_load_fragment_and_dropin(u); |
340 | if (r < 0) | |
01f78473 LP |
341 | return r; |
342 | ||
ac155bb8 | 343 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 344 | |
3ecaa09b | 345 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { |
57020a3a LP |
346 | Unit *x; |
347 | ||
348 | r = unit_load_related_unit(u, ".service", &x); | |
349 | if (r < 0) | |
01f78473 LP |
350 | return r; |
351 | ||
3ecaa09b LP |
352 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); |
353 | if (r < 0) | |
354 | return r; | |
57020a3a LP |
355 | } |
356 | ||
e0207c8d ZJS |
357 | r = path_add_mount_links(p); |
358 | if (r < 0) | |
01f78473 | 359 | return r; |
a40eb732 | 360 | |
e0207c8d ZJS |
361 | if (UNIT(p)->default_dependencies) { |
362 | r = path_add_default_dependencies(p); | |
363 | if (r < 0) | |
a40eb732 | 364 | return r; |
e0207c8d | 365 | } |
01f78473 LP |
366 | } |
367 | ||
368 | return path_verify(p); | |
369 | } | |
370 | ||
371 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
372 | Path *p = PATH(u); | |
3ecaa09b | 373 | Unit *trigger; |
01f78473 LP |
374 | PathSpec *s; |
375 | ||
e364ad06 LP |
376 | assert(p); |
377 | assert(f); | |
01f78473 | 378 | |
3ecaa09b LP |
379 | trigger = UNIT_TRIGGER(u); |
380 | ||
01f78473 LP |
381 | fprintf(f, |
382 | "%sPath State: %s\n" | |
cd43ca73 | 383 | "%sResult: %s\n" |
0e456f97 LP |
384 | "%sUnit: %s\n" |
385 | "%sMakeDirectory: %s\n" | |
386 | "%sDirectoryMode: %04o\n", | |
01f78473 | 387 | prefix, path_state_to_string(p->state), |
cd43ca73 | 388 | prefix, path_result_to_string(p->result), |
3ecaa09b | 389 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
390 | prefix, yes_no(p->make_directory), |
391 | prefix, p->directory_mode); | |
01f78473 LP |
392 | |
393 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 394 | path_spec_dump(s, f, prefix); |
01f78473 LP |
395 | } |
396 | ||
397 | static void path_unwatch(Path *p) { | |
398 | PathSpec *s; | |
399 | ||
400 | assert(p); | |
401 | ||
402 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 403 | path_spec_unwatch(s); |
01f78473 LP |
404 | } |
405 | ||
406 | static int path_watch(Path *p) { | |
407 | int r; | |
408 | PathSpec *s; | |
409 | ||
410 | assert(p); | |
411 | ||
e0207c8d | 412 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 413 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 414 | if (r < 0) |
01f78473 | 415 | return r; |
e0207c8d | 416 | } |
01f78473 LP |
417 | |
418 | return 0; | |
419 | } | |
420 | ||
421 | static void path_set_state(Path *p, PathState state) { | |
422 | PathState old_state; | |
423 | assert(p); | |
424 | ||
425 | old_state = p->state; | |
426 | p->state = state; | |
427 | ||
672028dc LP |
428 | if (state != PATH_WAITING && |
429 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
430 | path_unwatch(p); |
431 | ||
432 | if (state != old_state) | |
3541bf1f | 433 | log_unit_debug(UNIT(p), "Changed %s -> %s", path_state_to_string(old_state), path_state_to_string(state)); |
01f78473 | 434 | |
e2f3b44c | 435 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
436 | } |
437 | ||
ac3f50ca | 438 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 | 439 | |
be847e82 | 440 | static int path_coldplug(Unit *u) { |
01f78473 LP |
441 | Path *p = PATH(u); |
442 | ||
443 | assert(p); | |
444 | assert(p->state == PATH_DEAD); | |
445 | ||
446 | if (p->deserialized_state != p->state) { | |
447 | ||
448 | if (p->deserialized_state == PATH_WAITING || | |
be847e82 LP |
449 | p->deserialized_state == PATH_RUNNING) |
450 | path_enter_waiting(p, true, true); | |
451 | else | |
01f78473 LP |
452 | path_set_state(p, p->deserialized_state); |
453 | } | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
cd43ca73 | 458 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
459 | assert(p); |
460 | ||
cd43ca73 LP |
461 | if (f != PATH_SUCCESS) |
462 | p->result = f; | |
01f78473 | 463 | |
cd43ca73 | 464 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
465 | } |
466 | ||
467 | static void path_enter_running(Path *p) { | |
718db961 | 468 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
01f78473 | 469 | int r; |
398ef8ba | 470 | |
01f78473 | 471 | assert(p); |
3ecaa09b | 472 | |
ba3e67a7 | 473 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 474 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
475 | return; |
476 | ||
3ecaa09b | 477 | r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)), |
e0207c8d ZJS |
478 | JOB_REPLACE, true, &error, NULL); |
479 | if (r < 0) | |
01f78473 LP |
480 | goto fail; |
481 | ||
672028dc LP |
482 | p->inotify_triggered = false; |
483 | ||
e0207c8d ZJS |
484 | r = path_watch(p); |
485 | if (r < 0) | |
672028dc LP |
486 | goto fail; |
487 | ||
01f78473 LP |
488 | path_set_state(p, PATH_RUNNING); |
489 | return; | |
490 | ||
491 | fail: | |
f2341e0a | 492 | log_unit_warning(UNIT(p), "Failed to queue unit startup job: %s", bus_error_message(&error, r)); |
cd43ca73 | 493 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
494 | } |
495 | ||
ac3f50ca | 496 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 497 | PathSpec *s; |
01f78473 LP |
498 | bool good = false; |
499 | ||
ac3f50ca | 500 | assert(p); |
672028dc | 501 | |
01f78473 | 502 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 503 | good = path_spec_check_good(s, initial); |
01f78473 LP |
504 | |
505 | if (good) | |
506 | break; | |
507 | } | |
508 | ||
ac3f50ca LP |
509 | return good; |
510 | } | |
01f78473 | 511 | |
ac3f50ca LP |
512 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
513 | int r; | |
0595f9a1 | 514 | |
ac3f50ca LP |
515 | if (recheck) |
516 | if (path_check_good(p, initial)) { | |
f2341e0a | 517 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
518 | path_enter_running(p); |
519 | return; | |
520 | } | |
521 | ||
e0207c8d ZJS |
522 | r = path_watch(p); |
523 | if (r < 0) | |
ac3f50ca LP |
524 | goto fail; |
525 | ||
526 | /* Hmm, so now we have created inotify watches, but the file | |
527 | * might have appeared/been removed by now, so we must | |
528 | * recheck */ | |
529 | ||
530 | if (recheck) | |
531 | if (path_check_good(p, false)) { | |
f2341e0a | 532 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
533 | path_enter_running(p); |
534 | return; | |
535 | } | |
01f78473 LP |
536 | |
537 | path_set_state(p, PATH_WAITING); | |
538 | return; | |
539 | ||
540 | fail: | |
f2341e0a | 541 | log_unit_warning_errno(UNIT(p), r, "Failed to enter waiting state: %m"); |
cd43ca73 | 542 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
543 | } |
544 | ||
0e456f97 LP |
545 | static void path_mkdir(Path *p) { |
546 | PathSpec *s; | |
547 | ||
548 | assert(p); | |
549 | ||
550 | if (!p->make_directory) | |
551 | return; | |
552 | ||
4b562198 | 553 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 554 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
555 | } |
556 | ||
01f78473 LP |
557 | static int path_start(Unit *u) { |
558 | Path *p = PATH(u); | |
559 | ||
560 | assert(p); | |
fdf20a31 | 561 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 562 | |
3ecaa09b | 563 | if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED) |
01f78473 LP |
564 | return -ENOENT; |
565 | ||
0e456f97 LP |
566 | path_mkdir(p); |
567 | ||
cd43ca73 | 568 | p->result = PATH_SUCCESS; |
ac3f50ca | 569 | path_enter_waiting(p, true, true); |
00dc5d76 | 570 | |
82a2b6bb | 571 | return 1; |
01f78473 LP |
572 | } |
573 | ||
574 | static int path_stop(Unit *u) { | |
575 | Path *p = PATH(u); | |
576 | ||
577 | assert(p); | |
578 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
579 | ||
cd43ca73 | 580 | path_enter_dead(p, PATH_SUCCESS); |
82a2b6bb | 581 | return 1; |
01f78473 LP |
582 | } |
583 | ||
584 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
585 | Path *p = PATH(u); | |
586 | ||
587 | assert(u); | |
588 | assert(f); | |
589 | assert(fds); | |
590 | ||
591 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 592 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
593 | |
594 | return 0; | |
595 | } | |
596 | ||
597 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
598 | Path *p = PATH(u); | |
599 | ||
600 | assert(u); | |
601 | assert(key); | |
602 | assert(value); | |
603 | assert(fds); | |
604 | ||
605 | if (streq(key, "state")) { | |
606 | PathState state; | |
607 | ||
e0207c8d ZJS |
608 | state = path_state_from_string(value); |
609 | if (state < 0) | |
f2341e0a | 610 | log_unit_debug(u, "Failed to parse state value: %s", value); |
01f78473 LP |
611 | else |
612 | p->deserialized_state = state; | |
cd43ca73 LP |
613 | |
614 | } else if (streq(key, "result")) { | |
615 | PathResult f; | |
616 | ||
617 | f = path_result_from_string(value); | |
618 | if (f < 0) | |
f2341e0a | 619 | log_unit_debug(u, "Failed to parse result value: %s", value); |
cd43ca73 LP |
620 | else if (f != PATH_SUCCESS) |
621 | p->result = f; | |
622 | ||
01f78473 | 623 | } else |
f2341e0a | 624 | log_unit_debug(u, "Unknown serialization key: %s", key); |
01f78473 LP |
625 | |
626 | return 0; | |
627 | } | |
628 | ||
44a6b1b6 | 629 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
630 | assert(u); |
631 | ||
632 | return state_translation_table[PATH(u)->state]; | |
633 | } | |
634 | ||
44a6b1b6 | 635 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
636 | assert(u); |
637 | ||
638 | return path_state_to_string(PATH(u)->state); | |
639 | } | |
640 | ||
718db961 LP |
641 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
642 | PathSpec *s = userdata; | |
643 | Path *p; | |
4b562198 | 644 | int changed; |
01f78473 | 645 | |
718db961 LP |
646 | assert(s); |
647 | assert(s->unit); | |
01f78473 LP |
648 | assert(fd >= 0); |
649 | ||
718db961 LP |
650 | p = PATH(s->unit); |
651 | ||
672028dc LP |
652 | if (p->state != PATH_WAITING && |
653 | p->state != PATH_RUNNING) | |
718db961 | 654 | return 0; |
01f78473 | 655 | |
ac155bb8 | 656 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 657 | |
01f78473 | 658 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 659 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
660 | break; |
661 | ||
662 | if (!s) { | |
663 | log_error("Got event on unknown fd."); | |
664 | goto fail; | |
665 | } | |
666 | ||
718db961 | 667 | changed = path_spec_fd_event(s, revents); |
4b562198 | 668 | if (changed < 0) |
01f78473 | 669 | goto fail; |
01f78473 | 670 | |
672028dc LP |
671 | /* If we are already running, then remember that one event was |
672 | * dispatched so that we restart the service only if something | |
673 | * actually changed on disk */ | |
674 | p->inotify_triggered = true; | |
675 | ||
672028dc LP |
676 | if (changed) |
677 | path_enter_running(p); | |
678 | else | |
ac3f50ca | 679 | path_enter_waiting(p, false, true); |
672028dc | 680 | |
718db961 | 681 | return 0; |
01f78473 LP |
682 | |
683 | fail: | |
cd43ca73 | 684 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 685 | return 0; |
01f78473 LP |
686 | } |
687 | ||
3ecaa09b LP |
688 | static void path_trigger_notify(Unit *u, Unit *other) { |
689 | Path *p = PATH(u); | |
01f78473 | 690 | |
3ecaa09b LP |
691 | assert(u); |
692 | assert(other); | |
01f78473 | 693 | |
3ecaa09b LP |
694 | /* Invoked whenever the unit we trigger changes state or gains |
695 | * or loses a job */ | |
01f78473 | 696 | |
3ecaa09b LP |
697 | if (other->load_state != UNIT_LOADED) |
698 | return; | |
01f78473 | 699 | |
3ecaa09b LP |
700 | if (p->state == PATH_RUNNING && |
701 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
f2341e0a | 702 | log_unit_debug(UNIT(p), "Got notified about unit deactivation."); |
672028dc | 703 | |
3ecaa09b LP |
704 | /* Hmm, so inotify was triggered since the |
705 | * last activation, so I guess we need to | |
706 | * recheck what is going on. */ | |
707 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 708 | } |
01f78473 LP |
709 | } |
710 | ||
fdf20a31 | 711 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
712 | Path *p = PATH(u); |
713 | ||
714 | assert(p); | |
715 | ||
fdf20a31 | 716 | if (p->state == PATH_FAILED) |
5632e374 LP |
717 | path_set_state(p, PATH_DEAD); |
718 | ||
cd43ca73 | 719 | p->result = PATH_SUCCESS; |
5632e374 LP |
720 | } |
721 | ||
01f78473 LP |
722 | static const char* const path_type_table[_PATH_TYPE_MAX] = { |
723 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 724 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 725 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 726 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 727 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
728 | }; |
729 | ||
730 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
731 | ||
cd43ca73 LP |
732 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
733 | [PATH_SUCCESS] = "success", | |
2c5859af | 734 | [PATH_FAILURE_RESOURCES] = "resources", |
cd43ca73 LP |
735 | }; |
736 | ||
737 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
738 | ||
01f78473 | 739 | const UnitVTable path_vtable = { |
7d17cfbc | 740 | .object_size = sizeof(Path), |
718db961 | 741 | |
f975e971 LP |
742 | .sections = |
743 | "Unit\0" | |
744 | "Path\0" | |
745 | "Install\0", | |
01f78473 | 746 | |
0e456f97 | 747 | .init = path_init, |
01f78473 LP |
748 | .done = path_done, |
749 | .load = path_load, | |
750 | ||
751 | .coldplug = path_coldplug, | |
752 | ||
753 | .dump = path_dump, | |
754 | ||
755 | .start = path_start, | |
756 | .stop = path_stop, | |
757 | ||
758 | .serialize = path_serialize, | |
759 | .deserialize_item = path_deserialize_item, | |
760 | ||
761 | .active_state = path_active_state, | |
762 | .sub_state_to_string = path_sub_state_to_string, | |
763 | ||
3ecaa09b LP |
764 | .trigger_notify = path_trigger_notify, |
765 | ||
fdf20a31 | 766 | .reset_failed = path_reset_failed, |
5632e374 | 767 | |
aec8de63 | 768 | .bus_vtable = bus_path_vtable |
01f78473 | 769 | }; |