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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> | |
24 | #include <sys/ioctl.h> | |
25 | #include <errno.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | #include "unit.h" | |
29 | #include "unit-name.h" | |
30 | #include "path.h" | |
49e942b2 | 31 | #include "mkdir.h" |
01f78473 | 32 | #include "dbus-path.h" |
a40eb732 | 33 | #include "special.h" |
449101fc | 34 | #include "dbus-common.h" |
9eb977db | 35 | #include "path-util.h" |
f8c16f42 | 36 | #include "macro.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 | ||
57020a3a LP |
45 | int path_spec_watch(PathSpec *s, Unit *u) { |
46 | ||
4b562198 MS |
47 | static const int flags_table[_PATH_TYPE_MAX] = { |
48 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
49 | [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
50 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
e9223856 | 51 | [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 |
52 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO |
53 | }; | |
54 | ||
55 | bool exists = false; | |
bc41f93e | 56 | char *slash, *oldslash = NULL; |
4b562198 | 57 | int r; |
0e456f97 LP |
58 | |
59 | assert(u); | |
4b562198 | 60 | assert(s); |
0e456f97 | 61 | |
57020a3a | 62 | path_spec_unwatch(s, u); |
4b562198 | 63 | |
f8c16f42 ZJS |
64 | s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
65 | if (s->inotify_fd < 0) { | |
4b562198 MS |
66 | r = -errno; |
67 | goto fail; | |
68 | } | |
69 | ||
f8c16f42 ZJS |
70 | r = unit_watch_fd(u, s->inotify_fd, EPOLLIN, &s->watch); |
71 | if (r < 0) | |
4b562198 | 72 | goto fail; |
4b562198 | 73 | |
bc41f93e | 74 | /* This assumes the path was passed through path_kill_slashes()! */ |
4b562198 | 75 | |
180d6802 MS |
76 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { |
77 | char *cut = NULL; | |
4b562198 | 78 | int flags; |
bc41f93e ZJS |
79 | char tmp; |
80 | ||
81 | if (slash) { | |
180d6802 MS |
82 | cut = slash + (slash == s->path); |
83 | tmp = *cut; | |
84 | *cut = '\0'; | |
85 | ||
bc41f93e | 86 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; |
180d6802 | 87 | } else |
bc41f93e | 88 | flags = flags_table[s->type]; |
4b562198 | 89 | |
180d6802 | 90 | r = inotify_add_watch(s->inotify_fd, s->path, flags); |
bc41f93e | 91 | if (r < 0) { |
180d6802 MS |
92 | if (errno == EACCES || errno == ENOENT) { |
93 | if (cut) | |
94 | *cut = tmp; | |
bc41f93e | 95 | break; |
180d6802 | 96 | } |
4b562198 | 97 | |
180d6802 | 98 | log_warning("Failed to add watch on %s: %m", s->path); |
28a79bd2 | 99 | r = -errno; |
180d6802 MS |
100 | if (cut) |
101 | *cut = tmp; | |
28a79bd2 | 102 | goto fail; |
bc41f93e ZJS |
103 | } else { |
104 | exists = true; | |
105 | ||
106 | /* Path exists, we don't need to watch parent | |
107 | too closely. */ | |
108 | if (oldslash) { | |
180d6802 MS |
109 | char *cut2 = oldslash + (oldslash == s->path); |
110 | char tmp2 = *cut2; | |
111 | *cut2 = '\0'; | |
bc41f93e | 112 | |
180d6802 | 113 | inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); |
bc41f93e ZJS |
114 | /* Error is ignored, the worst can happen is |
115 | we get spurious events. */ | |
116 | ||
180d6802 | 117 | *cut2 = tmp2; |
bc41f93e | 118 | } |
28a79bd2 | 119 | } |
bc41f93e | 120 | |
180d6802 MS |
121 | if (cut) |
122 | *cut = tmp; | |
123 | ||
124 | if (slash) | |
bc41f93e | 125 | oldslash = slash; |
180d6802 | 126 | else { |
bc41f93e ZJS |
127 | /* whole path has been iterated over */ |
128 | s->primary_wd = r; | |
129 | break; | |
130 | } | |
131 | } | |
132 | ||
28a79bd2 ZJS |
133 | if (!exists) { |
134 | log_error("Failed to add watch on any of the components of %s: %m", | |
135 | s->path); | |
bc41f93e | 136 | r = -errno; /* either EACCESS or ENOENT */ |
28a79bd2 ZJS |
137 | goto fail; |
138 | } | |
139 | ||
4b562198 MS |
140 | return 0; |
141 | ||
142 | fail: | |
57020a3a | 143 | path_spec_unwatch(s, u); |
4b562198 | 144 | return r; |
0e456f97 LP |
145 | } |
146 | ||
57020a3a | 147 | void path_spec_unwatch(PathSpec *s, Unit *u) { |
62347bc2 LP |
148 | |
149 | if (s->inotify_fd < 0) | |
150 | return; | |
151 | ||
4b562198 | 152 | unit_unwatch_fd(u, &s->watch); |
62347bc2 LP |
153 | |
154 | close_nointr_nofail(s->inotify_fd); | |
155 | s->inotify_fd = -1; | |
156 | } | |
157 | ||
57020a3a | 158 | int path_spec_fd_event(PathSpec *s, uint32_t events) { |
7fd1b19b | 159 | _cleanup_free_ uint8_t *buf = NULL; |
4b562198 MS |
160 | struct inotify_event *e; |
161 | ssize_t k; | |
162 | int l; | |
163 | int r = 0; | |
164 | ||
165 | if (events != EPOLLIN) { | |
15f55e80 | 166 | log_error("Got invalid poll event on inotify."); |
a163db44 | 167 | return -EINVAL; |
4b562198 MS |
168 | } |
169 | ||
170 | if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) { | |
171 | log_error("FIONREAD failed: %m"); | |
a163db44 | 172 | return -errno; |
4b562198 MS |
173 | } |
174 | ||
175 | assert(l > 0); | |
176 | ||
15f55e80 | 177 | buf = malloc(l); |
a163db44 ZJS |
178 | if (!buf) |
179 | return log_oom(); | |
4b562198 | 180 | |
15f55e80 ZJS |
181 | k = read(s->inotify_fd, buf, l); |
182 | if (k < 0) { | |
4b562198 | 183 | log_error("Failed to read inotify event: %m"); |
a163db44 | 184 | return -errno; |
4b562198 MS |
185 | } |
186 | ||
187 | e = (struct inotify_event*) buf; | |
188 | ||
189 | while (k > 0) { | |
190 | size_t step; | |
191 | ||
714d943f MS |
192 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && |
193 | s->primary_wd == e->wd) | |
4b562198 MS |
194 | r = 1; |
195 | ||
196 | step = sizeof(struct inotify_event) + e->len; | |
197 | assert(step <= (size_t) k); | |
198 | ||
199 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
200 | k -= step; | |
201 | } | |
a163db44 | 202 | |
4b562198 MS |
203 | return r; |
204 | } | |
205 | ||
57020a3a | 206 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
207 | bool good = false; |
208 | ||
209 | switch (s->type) { | |
210 | ||
211 | case PATH_EXISTS: | |
212 | good = access(s->path, F_OK) >= 0; | |
213 | break; | |
214 | ||
215 | case PATH_EXISTS_GLOB: | |
216 | good = glob_exists(s->path) > 0; | |
217 | break; | |
218 | ||
219 | case PATH_DIRECTORY_NOT_EMPTY: { | |
220 | int k; | |
221 | ||
222 | k = dir_is_empty(s->path); | |
223 | good = !(k == -ENOENT || k > 0); | |
224 | break; | |
225 | } | |
226 | ||
714d943f MS |
227 | case PATH_CHANGED: |
228 | case PATH_MODIFIED: { | |
4b562198 MS |
229 | bool b; |
230 | ||
231 | b = access(s->path, F_OK) >= 0; | |
232 | good = !initial && b != s->previous_exists; | |
233 | s->previous_exists = b; | |
234 | break; | |
235 | } | |
236 | ||
237 | default: | |
238 | ; | |
239 | } | |
240 | ||
241 | return good; | |
242 | } | |
243 | ||
57020a3a | 244 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
245 | int r; |
246 | ||
247 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
248 | return; | |
249 | ||
15f55e80 ZJS |
250 | r = mkdir_p_label(s->path, mode); |
251 | if (r < 0) | |
4b562198 MS |
252 | log_warning("mkdir(%s) failed: %s", s->path, strerror(-r)); |
253 | } | |
254 | ||
57020a3a | 255 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
256 | fprintf(f, |
257 | "%s%s: %s\n", | |
258 | prefix, | |
259 | path_type_to_string(s->type), | |
260 | s->path); | |
261 | } | |
262 | ||
57020a3a LP |
263 | void path_spec_done(PathSpec *s) { |
264 | assert(s); | |
4b562198 | 265 | assert(s->inotify_fd == -1); |
57020a3a | 266 | |
4b562198 MS |
267 | free(s->path); |
268 | } | |
269 | ||
270 | static void path_init(Unit *u) { | |
271 | Path *p = PATH(u); | |
272 | ||
273 | assert(u); | |
ac155bb8 | 274 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
275 | |
276 | p->directory_mode = 0755; | |
277 | } | |
278 | ||
74051b9b | 279 | void path_free_specs(Path *p) { |
01f78473 LP |
280 | PathSpec *s; |
281 | ||
282 | assert(p); | |
283 | ||
284 | while ((s = p->specs)) { | |
74051b9b | 285 | path_spec_unwatch(s, UNIT(p)); |
71fda00f | 286 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 287 | path_spec_done(s); |
01f78473 LP |
288 | free(s); |
289 | } | |
290 | } | |
291 | ||
74051b9b LP |
292 | static void path_done(Unit *u) { |
293 | Path *p = PATH(u); | |
294 | ||
295 | assert(p); | |
296 | ||
74051b9b LP |
297 | path_free_specs(p); |
298 | } | |
299 | ||
a57f7e2c | 300 | static int path_add_mount_links(Path *p) { |
01f78473 LP |
301 | PathSpec *s; |
302 | int r; | |
303 | ||
304 | assert(p); | |
01f78473 LP |
305 | |
306 | LIST_FOREACH(spec, s, p->specs) { | |
a57f7e2c | 307 | r = unit_require_mounts_for(UNIT(p), s->path); |
e0207c8d | 308 | if (r < 0) |
01f78473 | 309 | return r; |
e0207c8d | 310 | } |
01f78473 LP |
311 | |
312 | return 0; | |
313 | } | |
314 | ||
315 | static int path_verify(Path *p) { | |
316 | assert(p); | |
317 | ||
1124fe6f | 318 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
319 | return 0; |
320 | ||
321 | if (!p->specs) { | |
66870f90 ZJS |
322 | log_error_unit(UNIT(p)->id, |
323 | "%s lacks path setting. Refusing.", UNIT(p)->id); | |
01f78473 LP |
324 | return -EINVAL; |
325 | } | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
6c155fe3 LP |
330 | static int path_add_default_dependencies(Path *p) { |
331 | int r; | |
332 | ||
333 | assert(p); | |
334 | ||
e3d84721 LP |
335 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, |
336 | SPECIAL_PATHS_TARGET, NULL, true); | |
337 | if (r < 0) | |
338 | return r; | |
2a77d31d | 339 | |
e3d84721 | 340 | if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) { |
e0207c8d ZJS |
341 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, |
342 | SPECIAL_SYSINIT_TARGET, NULL, true); | |
343 | if (r < 0) | |
6c155fe3 | 344 | return r; |
2a77d31d | 345 | } |
6c155fe3 | 346 | |
e0207c8d ZJS |
347 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, |
348 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
6c155fe3 LP |
349 | } |
350 | ||
01f78473 LP |
351 | static int path_load(Unit *u) { |
352 | Path *p = PATH(u); | |
353 | int r; | |
354 | ||
355 | assert(u); | |
ac155bb8 | 356 | assert(u->load_state == UNIT_STUB); |
01f78473 | 357 | |
e0207c8d ZJS |
358 | r = unit_load_fragment_and_dropin(u); |
359 | if (r < 0) | |
01f78473 LP |
360 | return r; |
361 | ||
ac155bb8 | 362 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 363 | |
3ecaa09b | 364 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { |
57020a3a LP |
365 | Unit *x; |
366 | ||
367 | r = unit_load_related_unit(u, ".service", &x); | |
368 | if (r < 0) | |
01f78473 LP |
369 | return r; |
370 | ||
3ecaa09b LP |
371 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); |
372 | if (r < 0) | |
373 | return r; | |
57020a3a LP |
374 | } |
375 | ||
e0207c8d ZJS |
376 | r = path_add_mount_links(p); |
377 | if (r < 0) | |
01f78473 | 378 | return r; |
a40eb732 | 379 | |
e0207c8d ZJS |
380 | if (UNIT(p)->default_dependencies) { |
381 | r = path_add_default_dependencies(p); | |
382 | if (r < 0) | |
a40eb732 | 383 | return r; |
e0207c8d | 384 | } |
01f78473 LP |
385 | } |
386 | ||
387 | return path_verify(p); | |
388 | } | |
389 | ||
390 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
391 | Path *p = PATH(u); | |
3ecaa09b | 392 | Unit *trigger; |
01f78473 LP |
393 | PathSpec *s; |
394 | ||
e364ad06 LP |
395 | assert(p); |
396 | assert(f); | |
01f78473 | 397 | |
3ecaa09b LP |
398 | trigger = UNIT_TRIGGER(u); |
399 | ||
01f78473 LP |
400 | fprintf(f, |
401 | "%sPath State: %s\n" | |
cd43ca73 | 402 | "%sResult: %s\n" |
0e456f97 LP |
403 | "%sUnit: %s\n" |
404 | "%sMakeDirectory: %s\n" | |
405 | "%sDirectoryMode: %04o\n", | |
01f78473 | 406 | prefix, path_state_to_string(p->state), |
cd43ca73 | 407 | prefix, path_result_to_string(p->result), |
3ecaa09b | 408 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
409 | prefix, yes_no(p->make_directory), |
410 | prefix, p->directory_mode); | |
01f78473 LP |
411 | |
412 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 413 | path_spec_dump(s, f, prefix); |
01f78473 LP |
414 | } |
415 | ||
416 | static void path_unwatch(Path *p) { | |
417 | PathSpec *s; | |
418 | ||
419 | assert(p); | |
420 | ||
421 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 422 | path_spec_unwatch(s, UNIT(p)); |
01f78473 LP |
423 | } |
424 | ||
425 | static int path_watch(Path *p) { | |
426 | int r; | |
427 | PathSpec *s; | |
428 | ||
429 | assert(p); | |
430 | ||
e0207c8d ZJS |
431 | LIST_FOREACH(spec, s, p->specs) { |
432 | r = path_spec_watch(s, UNIT(p)); | |
433 | if (r < 0) | |
01f78473 | 434 | return r; |
e0207c8d | 435 | } |
01f78473 LP |
436 | |
437 | return 0; | |
438 | } | |
439 | ||
440 | static void path_set_state(Path *p, PathState state) { | |
441 | PathState old_state; | |
442 | assert(p); | |
443 | ||
444 | old_state = p->state; | |
445 | p->state = state; | |
446 | ||
672028dc LP |
447 | if (state != PATH_WAITING && |
448 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
449 | path_unwatch(p); |
450 | ||
451 | if (state != old_state) | |
452 | log_debug("%s changed %s -> %s", | |
1124fe6f | 453 | UNIT(p)->id, |
01f78473 LP |
454 | path_state_to_string(old_state), |
455 | path_state_to_string(state)); | |
456 | ||
e2f3b44c | 457 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
458 | } |
459 | ||
ac3f50ca | 460 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 LP |
461 | |
462 | static int path_coldplug(Unit *u) { | |
463 | Path *p = PATH(u); | |
464 | ||
465 | assert(p); | |
466 | assert(p->state == PATH_DEAD); | |
467 | ||
468 | if (p->deserialized_state != p->state) { | |
469 | ||
470 | if (p->deserialized_state == PATH_WAITING || | |
471 | p->deserialized_state == PATH_RUNNING) | |
ac3f50ca | 472 | path_enter_waiting(p, true, true); |
01f78473 LP |
473 | else |
474 | path_set_state(p, p->deserialized_state); | |
475 | } | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
cd43ca73 | 480 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
481 | assert(p); |
482 | ||
cd43ca73 LP |
483 | if (f != PATH_SUCCESS) |
484 | p->result = f; | |
01f78473 | 485 | |
cd43ca73 | 486 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
487 | } |
488 | ||
489 | static void path_enter_running(Path *p) { | |
3ecaa09b | 490 | _cleanup_dbus_error_free_ DBusError error; |
01f78473 | 491 | int r; |
398ef8ba | 492 | |
01f78473 | 493 | assert(p); |
3ecaa09b | 494 | |
398ef8ba | 495 | dbus_error_init(&error); |
01f78473 | 496 | |
ba3e67a7 | 497 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 498 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
499 | return; |
500 | ||
3ecaa09b | 501 | r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)), |
e0207c8d ZJS |
502 | JOB_REPLACE, true, &error, NULL); |
503 | if (r < 0) | |
01f78473 LP |
504 | goto fail; |
505 | ||
672028dc LP |
506 | p->inotify_triggered = false; |
507 | ||
e0207c8d ZJS |
508 | r = path_watch(p); |
509 | if (r < 0) | |
672028dc LP |
510 | goto fail; |
511 | ||
01f78473 LP |
512 | path_set_state(p, PATH_RUNNING); |
513 | return; | |
514 | ||
515 | fail: | |
e0207c8d ZJS |
516 | log_warning("%s failed to queue unit startup job: %s", |
517 | UNIT(p)->id, bus_error(&error, r)); | |
cd43ca73 | 518 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
519 | } |
520 | ||
ac3f50ca | 521 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 522 | PathSpec *s; |
01f78473 LP |
523 | bool good = false; |
524 | ||
ac3f50ca | 525 | assert(p); |
672028dc | 526 | |
01f78473 | 527 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 528 | good = path_spec_check_good(s, initial); |
01f78473 LP |
529 | |
530 | if (good) | |
531 | break; | |
532 | } | |
533 | ||
ac3f50ca LP |
534 | return good; |
535 | } | |
01f78473 | 536 | |
ac3f50ca LP |
537 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
538 | int r; | |
0595f9a1 | 539 | |
ac3f50ca LP |
540 | if (recheck) |
541 | if (path_check_good(p, initial)) { | |
1124fe6f | 542 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
543 | path_enter_running(p); |
544 | return; | |
545 | } | |
546 | ||
e0207c8d ZJS |
547 | r = path_watch(p); |
548 | if (r < 0) | |
ac3f50ca LP |
549 | goto fail; |
550 | ||
551 | /* Hmm, so now we have created inotify watches, but the file | |
552 | * might have appeared/been removed by now, so we must | |
553 | * recheck */ | |
554 | ||
555 | if (recheck) | |
556 | if (path_check_good(p, false)) { | |
1124fe6f | 557 | log_debug("%s got triggered.", UNIT(p)->id); |
ac3f50ca LP |
558 | path_enter_running(p); |
559 | return; | |
560 | } | |
01f78473 LP |
561 | |
562 | path_set_state(p, PATH_WAITING); | |
563 | return; | |
564 | ||
565 | fail: | |
e0207c8d ZJS |
566 | log_warning("%s failed to enter waiting state: %s", |
567 | UNIT(p)->id, strerror(-r)); | |
cd43ca73 | 568 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
569 | } |
570 | ||
0e456f97 LP |
571 | static void path_mkdir(Path *p) { |
572 | PathSpec *s; | |
573 | ||
574 | assert(p); | |
575 | ||
576 | if (!p->make_directory) | |
577 | return; | |
578 | ||
4b562198 | 579 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 580 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
581 | } |
582 | ||
01f78473 LP |
583 | static int path_start(Unit *u) { |
584 | Path *p = PATH(u); | |
585 | ||
586 | assert(p); | |
fdf20a31 | 587 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 588 | |
3ecaa09b | 589 | if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED) |
01f78473 LP |
590 | return -ENOENT; |
591 | ||
0e456f97 LP |
592 | path_mkdir(p); |
593 | ||
cd43ca73 | 594 | p->result = PATH_SUCCESS; |
ac3f50ca | 595 | path_enter_waiting(p, true, true); |
00dc5d76 | 596 | |
01f78473 LP |
597 | return 0; |
598 | } | |
599 | ||
600 | static int path_stop(Unit *u) { | |
601 | Path *p = PATH(u); | |
602 | ||
603 | assert(p); | |
604 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
605 | ||
cd43ca73 | 606 | path_enter_dead(p, PATH_SUCCESS); |
01f78473 LP |
607 | return 0; |
608 | } | |
609 | ||
610 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
611 | Path *p = PATH(u); | |
612 | ||
613 | assert(u); | |
614 | assert(f); | |
615 | assert(fds); | |
616 | ||
617 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 618 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
619 | |
620 | return 0; | |
621 | } | |
622 | ||
623 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
624 | Path *p = PATH(u); | |
625 | ||
626 | assert(u); | |
627 | assert(key); | |
628 | assert(value); | |
629 | assert(fds); | |
630 | ||
631 | if (streq(key, "state")) { | |
632 | PathState state; | |
633 | ||
e0207c8d ZJS |
634 | state = path_state_from_string(value); |
635 | if (state < 0) | |
01f78473 LP |
636 | log_debug("Failed to parse state value %s", value); |
637 | else | |
638 | p->deserialized_state = state; | |
cd43ca73 LP |
639 | |
640 | } else if (streq(key, "result")) { | |
641 | PathResult f; | |
642 | ||
643 | f = path_result_from_string(value); | |
644 | if (f < 0) | |
645 | log_debug("Failed to parse result value %s", value); | |
646 | else if (f != PATH_SUCCESS) | |
647 | p->result = f; | |
648 | ||
01f78473 LP |
649 | } else |
650 | log_debug("Unknown serialization key '%s'", key); | |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
44a6b1b6 | 655 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
656 | assert(u); |
657 | ||
658 | return state_translation_table[PATH(u)->state]; | |
659 | } | |
660 | ||
44a6b1b6 | 661 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
662 | assert(u); |
663 | ||
664 | return path_state_to_string(PATH(u)->state); | |
665 | } | |
666 | ||
667 | static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { | |
668 | Path *p = PATH(u); | |
01f78473 | 669 | PathSpec *s; |
4b562198 | 670 | int changed; |
01f78473 LP |
671 | |
672 | assert(p); | |
673 | assert(fd >= 0); | |
674 | ||
672028dc LP |
675 | if (p->state != PATH_WAITING && |
676 | p->state != PATH_RUNNING) | |
01f78473 LP |
677 | return; |
678 | ||
ac155bb8 | 679 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 680 | |
01f78473 | 681 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 682 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
683 | break; |
684 | ||
685 | if (!s) { | |
686 | log_error("Got event on unknown fd."); | |
687 | goto fail; | |
688 | } | |
689 | ||
57020a3a | 690 | changed = path_spec_fd_event(s, events); |
4b562198 | 691 | if (changed < 0) |
01f78473 | 692 | goto fail; |
01f78473 | 693 | |
672028dc LP |
694 | /* If we are already running, then remember that one event was |
695 | * dispatched so that we restart the service only if something | |
696 | * actually changed on disk */ | |
697 | p->inotify_triggered = true; | |
698 | ||
672028dc LP |
699 | if (changed) |
700 | path_enter_running(p); | |
701 | else | |
ac3f50ca | 702 | path_enter_waiting(p, false, true); |
672028dc | 703 | |
01f78473 LP |
704 | return; |
705 | ||
706 | fail: | |
cd43ca73 | 707 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
708 | } |
709 | ||
3ecaa09b LP |
710 | static void path_trigger_notify(Unit *u, Unit *other) { |
711 | Path *p = PATH(u); | |
01f78473 | 712 | |
3ecaa09b LP |
713 | assert(u); |
714 | assert(other); | |
01f78473 | 715 | |
3ecaa09b LP |
716 | /* Invoked whenever the unit we trigger changes state or gains |
717 | * or loses a job */ | |
01f78473 | 718 | |
3ecaa09b LP |
719 | if (other->load_state != UNIT_LOADED) |
720 | return; | |
01f78473 | 721 | |
3ecaa09b LP |
722 | if (p->state == PATH_RUNNING && |
723 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
724 | log_debug_unit(UNIT(p)->id, | |
725 | "%s got notified about unit deactivation.", | |
726 | UNIT(p)->id); | |
672028dc | 727 | |
3ecaa09b LP |
728 | /* Hmm, so inotify was triggered since the |
729 | * last activation, so I guess we need to | |
730 | * recheck what is going on. */ | |
731 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 732 | } |
01f78473 LP |
733 | } |
734 | ||
fdf20a31 | 735 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
736 | Path *p = PATH(u); |
737 | ||
738 | assert(p); | |
739 | ||
fdf20a31 | 740 | if (p->state == PATH_FAILED) |
5632e374 LP |
741 | path_set_state(p, PATH_DEAD); |
742 | ||
cd43ca73 | 743 | p->result = PATH_SUCCESS; |
5632e374 LP |
744 | } |
745 | ||
01f78473 LP |
746 | static const char* const path_state_table[_PATH_STATE_MAX] = { |
747 | [PATH_DEAD] = "dead", | |
748 | [PATH_WAITING] = "waiting", | |
749 | [PATH_RUNNING] = "running", | |
fdf20a31 | 750 | [PATH_FAILED] = "failed" |
01f78473 LP |
751 | }; |
752 | ||
753 | DEFINE_STRING_TABLE_LOOKUP(path_state, PathState); | |
754 | ||
755 | static const char* const path_type_table[_PATH_TYPE_MAX] = { | |
756 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 757 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
01f78473 | 758 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 759 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
760 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty" |
761 | }; | |
762 | ||
763 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
764 | ||
cd43ca73 LP |
765 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
766 | [PATH_SUCCESS] = "success", | |
767 | [PATH_FAILURE_RESOURCES] = "resources" | |
768 | }; | |
769 | ||
770 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
771 | ||
01f78473 | 772 | const UnitVTable path_vtable = { |
7d17cfbc | 773 | .object_size = sizeof(Path), |
f975e971 LP |
774 | .sections = |
775 | "Unit\0" | |
776 | "Path\0" | |
777 | "Install\0", | |
01f78473 | 778 | |
0e456f97 | 779 | .init = path_init, |
01f78473 LP |
780 | .done = path_done, |
781 | .load = path_load, | |
782 | ||
783 | .coldplug = path_coldplug, | |
784 | ||
785 | .dump = path_dump, | |
786 | ||
787 | .start = path_start, | |
788 | .stop = path_stop, | |
789 | ||
790 | .serialize = path_serialize, | |
791 | .deserialize_item = path_deserialize_item, | |
792 | ||
793 | .active_state = path_active_state, | |
794 | .sub_state_to_string = path_sub_state_to_string, | |
795 | ||
796 | .fd_event = path_fd_event, | |
797 | ||
3ecaa09b LP |
798 | .trigger_notify = path_trigger_notify, |
799 | ||
fdf20a31 | 800 | .reset_failed = path_reset_failed, |
5632e374 | 801 | |
c4e2ceae | 802 | .bus_interface = "org.freedesktop.systemd1.Path", |
cd43ca73 LP |
803 | .bus_message_handler = bus_path_message_handler, |
804 | .bus_invalidating_properties = bus_path_invalidating_properties | |
01f78473 | 805 | }; |