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Commit | Line | Data |
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01f78473 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
7 | under the terms of the GNU Lesser General Public License as published by |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
01f78473 LP |
9 | (at your option) any later version. |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 14 | Lesser General Public License for more details. |
01f78473 | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
01f78473 LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
01f78473 | 20 | #include <errno.h> |
07630cea LP |
21 | #include <sys/epoll.h> |
22 | #include <sys/inotify.h> | |
01f78473 LP |
23 | #include <unistd.h> |
24 | ||
07630cea LP |
25 | #include "bus-error.h" |
26 | #include "bus-util.h" | |
01f78473 | 27 | #include "dbus-path.h" |
3ffd4af2 | 28 | #include "fd-util.h" |
77601719 | 29 | #include "fs-util.h" |
7d50b32a | 30 | #include "glob-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 | ||
edfd706d | 113 | /* Path exists, we don't need to watch parent too closely. */ |
bc41f93e | 114 | if (oldslash) { |
180d6802 MS |
115 | char *cut2 = oldslash + (oldslash == s->path); |
116 | char tmp2 = *cut2; | |
117 | *cut2 = '\0'; | |
bc41f93e | 118 | |
edfd706d ZJS |
119 | (void) inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); |
120 | /* Error is ignored, the worst can happen is we get spurious events. */ | |
bc41f93e | 121 | |
180d6802 | 122 | *cut2 = tmp2; |
bc41f93e | 123 | } |
28a79bd2 | 124 | } |
bc41f93e | 125 | |
180d6802 MS |
126 | if (cut) |
127 | *cut = tmp; | |
128 | ||
129 | if (slash) | |
bc41f93e | 130 | oldslash = slash; |
180d6802 | 131 | else { |
bc41f93e ZJS |
132 | /* whole path has been iterated over */ |
133 | s->primary_wd = r; | |
134 | break; | |
135 | } | |
136 | } | |
137 | ||
28a79bd2 | 138 | if (!exists) { |
f2341e0a LP |
139 | r = log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", s->path); |
140 | /* either EACCESS or ENOENT */ | |
28a79bd2 ZJS |
141 | goto fail; |
142 | } | |
143 | ||
4b562198 MS |
144 | return 0; |
145 | ||
146 | fail: | |
718db961 | 147 | path_spec_unwatch(s); |
4b562198 | 148 | return r; |
0e456f97 LP |
149 | } |
150 | ||
718db961 LP |
151 | void path_spec_unwatch(PathSpec *s) { |
152 | assert(s); | |
62347bc2 | 153 | |
718db961 | 154 | s->event_source = sd_event_source_unref(s->event_source); |
03e334a1 | 155 | s->inotify_fd = safe_close(s->inotify_fd); |
62347bc2 LP |
156 | } |
157 | ||
718db961 | 158 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { |
0254e944 | 159 | union inotify_event_buffer buffer; |
4b562198 | 160 | struct inotify_event *e; |
f7c1ad4f | 161 | ssize_t l; |
4b562198 MS |
162 | int r = 0; |
163 | ||
718db961 | 164 | if (revents != EPOLLIN) { |
15f55e80 | 165 | log_error("Got invalid poll event on inotify."); |
a163db44 | 166 | return -EINVAL; |
4b562198 MS |
167 | } |
168 | ||
0254e944 | 169 | l = read(s->inotify_fd, &buffer, sizeof(buffer)); |
f7c1ad4f LP |
170 | if (l < 0) { |
171 | if (errno == EAGAIN || errno == EINTR) | |
172 | return 0; | |
4b562198 | 173 | |
4a62c710 | 174 | return log_error_errno(errno, "Failed to read inotify event: %m"); |
f7c1ad4f | 175 | } |
4b562198 | 176 | |
f7c1ad4f | 177 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
714d943f MS |
178 | if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && |
179 | s->primary_wd == e->wd) | |
4b562198 | 180 | r = 1; |
4b562198 | 181 | } |
a163db44 | 182 | |
4b562198 MS |
183 | return r; |
184 | } | |
185 | ||
57020a3a | 186 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
187 | bool good = false; |
188 | ||
189 | switch (s->type) { | |
190 | ||
191 | case PATH_EXISTS: | |
192 | good = access(s->path, F_OK) >= 0; | |
193 | break; | |
194 | ||
195 | case PATH_EXISTS_GLOB: | |
196 | good = glob_exists(s->path) > 0; | |
197 | break; | |
198 | ||
199 | case PATH_DIRECTORY_NOT_EMPTY: { | |
200 | int k; | |
201 | ||
202 | k = dir_is_empty(s->path); | |
203 | good = !(k == -ENOENT || k > 0); | |
204 | break; | |
205 | } | |
206 | ||
714d943f MS |
207 | case PATH_CHANGED: |
208 | case PATH_MODIFIED: { | |
4b562198 MS |
209 | bool b; |
210 | ||
211 | b = access(s->path, F_OK) >= 0; | |
212 | good = !initial && b != s->previous_exists; | |
213 | s->previous_exists = b; | |
214 | break; | |
215 | } | |
216 | ||
217 | default: | |
218 | ; | |
219 | } | |
220 | ||
221 | return good; | |
222 | } | |
223 | ||
57020a3a | 224 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
225 | int r; |
226 | ||
227 | if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) | |
228 | return; | |
229 | ||
15f55e80 ZJS |
230 | r = mkdir_p_label(s->path, mode); |
231 | if (r < 0) | |
da927ba9 | 232 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
233 | } |
234 | ||
57020a3a | 235 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
236 | fprintf(f, |
237 | "%s%s: %s\n", | |
238 | prefix, | |
239 | path_type_to_string(s->type), | |
240 | s->path); | |
241 | } | |
242 | ||
57020a3a LP |
243 | void path_spec_done(PathSpec *s) { |
244 | assert(s); | |
4b562198 | 245 | assert(s->inotify_fd == -1); |
57020a3a | 246 | |
4b562198 MS |
247 | free(s->path); |
248 | } | |
249 | ||
250 | static void path_init(Unit *u) { | |
251 | Path *p = PATH(u); | |
252 | ||
253 | assert(u); | |
ac155bb8 | 254 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
255 | |
256 | p->directory_mode = 0755; | |
257 | } | |
258 | ||
74051b9b | 259 | void path_free_specs(Path *p) { |
01f78473 LP |
260 | PathSpec *s; |
261 | ||
262 | assert(p); | |
263 | ||
264 | while ((s = p->specs)) { | |
718db961 | 265 | path_spec_unwatch(s); |
71fda00f | 266 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 267 | path_spec_done(s); |
01f78473 LP |
268 | free(s); |
269 | } | |
270 | } | |
271 | ||
74051b9b LP |
272 | static void path_done(Unit *u) { |
273 | Path *p = PATH(u); | |
274 | ||
275 | assert(p); | |
276 | ||
74051b9b LP |
277 | path_free_specs(p); |
278 | } | |
279 | ||
a57f7e2c | 280 | static int path_add_mount_links(Path *p) { |
01f78473 LP |
281 | PathSpec *s; |
282 | int r; | |
283 | ||
284 | assert(p); | |
01f78473 LP |
285 | |
286 | LIST_FOREACH(spec, s, p->specs) { | |
a57f7e2c | 287 | r = unit_require_mounts_for(UNIT(p), s->path); |
e0207c8d | 288 | if (r < 0) |
01f78473 | 289 | return r; |
e0207c8d | 290 | } |
01f78473 LP |
291 | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static int path_verify(Path *p) { | |
296 | assert(p); | |
297 | ||
1124fe6f | 298 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
299 | return 0; |
300 | ||
301 | if (!p->specs) { | |
f2341e0a | 302 | log_unit_error(UNIT(p), "Path unit lacks path setting. Refusing."); |
01f78473 LP |
303 | return -EINVAL; |
304 | } | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
6c155fe3 LP |
309 | static int path_add_default_dependencies(Path *p) { |
310 | int r; | |
311 | ||
312 | assert(p); | |
313 | ||
4c9ea260 LP |
314 | if (!UNIT(p)->default_dependencies) |
315 | return 0; | |
316 | ||
317 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_PATHS_TARGET, NULL, true); | |
e3d84721 LP |
318 | if (r < 0) |
319 | return r; | |
2a77d31d | 320 | |
463d0d15 | 321 | if (MANAGER_IS_SYSTEM(UNIT(p)->manager)) { |
4c9ea260 | 322 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); |
e0207c8d | 323 | if (r < 0) |
6c155fe3 | 324 | return r; |
2a77d31d | 325 | } |
6c155fe3 | 326 | |
4c9ea260 | 327 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); |
6c155fe3 LP |
328 | } |
329 | ||
01f78473 LP |
330 | static int path_load(Unit *u) { |
331 | Path *p = PATH(u); | |
332 | int r; | |
333 | ||
334 | assert(u); | |
ac155bb8 | 335 | assert(u->load_state == UNIT_STUB); |
01f78473 | 336 | |
e0207c8d ZJS |
337 | r = unit_load_fragment_and_dropin(u); |
338 | if (r < 0) | |
01f78473 LP |
339 | return r; |
340 | ||
ac155bb8 | 341 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 342 | |
3ecaa09b | 343 | if (set_isempty(u->dependencies[UNIT_TRIGGERS])) { |
57020a3a LP |
344 | Unit *x; |
345 | ||
346 | r = unit_load_related_unit(u, ".service", &x); | |
347 | if (r < 0) | |
01f78473 LP |
348 | return r; |
349 | ||
3ecaa09b LP |
350 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true); |
351 | if (r < 0) | |
352 | return r; | |
57020a3a LP |
353 | } |
354 | ||
e0207c8d ZJS |
355 | r = path_add_mount_links(p); |
356 | if (r < 0) | |
01f78473 | 357 | return r; |
a40eb732 | 358 | |
4c9ea260 LP |
359 | r = path_add_default_dependencies(p); |
360 | if (r < 0) | |
361 | return r; | |
01f78473 LP |
362 | } |
363 | ||
364 | return path_verify(p); | |
365 | } | |
366 | ||
367 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
368 | Path *p = PATH(u); | |
3ecaa09b | 369 | Unit *trigger; |
01f78473 LP |
370 | PathSpec *s; |
371 | ||
e364ad06 LP |
372 | assert(p); |
373 | assert(f); | |
01f78473 | 374 | |
3ecaa09b LP |
375 | trigger = UNIT_TRIGGER(u); |
376 | ||
01f78473 LP |
377 | fprintf(f, |
378 | "%sPath State: %s\n" | |
cd43ca73 | 379 | "%sResult: %s\n" |
0e456f97 LP |
380 | "%sUnit: %s\n" |
381 | "%sMakeDirectory: %s\n" | |
382 | "%sDirectoryMode: %04o\n", | |
01f78473 | 383 | prefix, path_state_to_string(p->state), |
cd43ca73 | 384 | prefix, path_result_to_string(p->result), |
3ecaa09b | 385 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
386 | prefix, yes_no(p->make_directory), |
387 | prefix, p->directory_mode); | |
01f78473 LP |
388 | |
389 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 390 | path_spec_dump(s, f, prefix); |
01f78473 LP |
391 | } |
392 | ||
393 | static void path_unwatch(Path *p) { | |
394 | PathSpec *s; | |
395 | ||
396 | assert(p); | |
397 | ||
398 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 399 | path_spec_unwatch(s); |
01f78473 LP |
400 | } |
401 | ||
402 | static int path_watch(Path *p) { | |
403 | int r; | |
404 | PathSpec *s; | |
405 | ||
406 | assert(p); | |
407 | ||
e0207c8d | 408 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 409 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 410 | if (r < 0) |
01f78473 | 411 | return r; |
e0207c8d | 412 | } |
01f78473 LP |
413 | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static void path_set_state(Path *p, PathState state) { | |
418 | PathState old_state; | |
419 | assert(p); | |
420 | ||
421 | old_state = p->state; | |
422 | p->state = state; | |
423 | ||
672028dc LP |
424 | if (state != PATH_WAITING && |
425 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
426 | path_unwatch(p); |
427 | ||
428 | if (state != old_state) | |
3541bf1f | 429 | log_unit_debug(UNIT(p), "Changed %s -> %s", path_state_to_string(old_state), path_state_to_string(state)); |
01f78473 | 430 | |
e2f3b44c | 431 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true); |
01f78473 LP |
432 | } |
433 | ||
ac3f50ca | 434 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 | 435 | |
be847e82 | 436 | static int path_coldplug(Unit *u) { |
01f78473 LP |
437 | Path *p = PATH(u); |
438 | ||
439 | assert(p); | |
440 | assert(p->state == PATH_DEAD); | |
441 | ||
442 | if (p->deserialized_state != p->state) { | |
443 | ||
444 | if (p->deserialized_state == PATH_WAITING || | |
be847e82 LP |
445 | p->deserialized_state == PATH_RUNNING) |
446 | path_enter_waiting(p, true, true); | |
447 | else | |
01f78473 LP |
448 | path_set_state(p, p->deserialized_state); |
449 | } | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
cd43ca73 | 454 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
455 | assert(p); |
456 | ||
cd43ca73 LP |
457 | if (f != PATH_SUCCESS) |
458 | p->result = f; | |
01f78473 | 459 | |
cd43ca73 | 460 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
461 | } |
462 | ||
463 | static void path_enter_running(Path *p) { | |
4afd3348 | 464 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
e903182e | 465 | Unit *trigger; |
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 | ||
e903182e LP |
474 | trigger = UNIT_TRIGGER(UNIT(p)); |
475 | if (!trigger) { | |
476 | log_unit_error(UNIT(p), "Unit to trigger vanished."); | |
9e4942ed | 477 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
e903182e LP |
478 | return; |
479 | } | |
480 | ||
481 | r = manager_add_job(UNIT(p)->manager, JOB_START, trigger, JOB_REPLACE, &error, NULL); | |
e0207c8d | 482 | if (r < 0) |
01f78473 LP |
483 | goto fail; |
484 | ||
672028dc LP |
485 | p->inotify_triggered = false; |
486 | ||
e0207c8d ZJS |
487 | r = path_watch(p); |
488 | if (r < 0) | |
672028dc LP |
489 | goto fail; |
490 | ||
01f78473 LP |
491 | path_set_state(p, PATH_RUNNING); |
492 | return; | |
493 | ||
494 | fail: | |
f2341e0a | 495 | log_unit_warning(UNIT(p), "Failed to queue unit startup job: %s", bus_error_message(&error, r)); |
cd43ca73 | 496 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
497 | } |
498 | ||
ac3f50ca | 499 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 500 | PathSpec *s; |
01f78473 LP |
501 | bool good = false; |
502 | ||
ac3f50ca | 503 | assert(p); |
672028dc | 504 | |
01f78473 | 505 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 506 | good = path_spec_check_good(s, initial); |
01f78473 LP |
507 | |
508 | if (good) | |
509 | break; | |
510 | } | |
511 | ||
ac3f50ca LP |
512 | return good; |
513 | } | |
01f78473 | 514 | |
ac3f50ca LP |
515 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
516 | int r; | |
0595f9a1 | 517 | |
ac3f50ca LP |
518 | if (recheck) |
519 | if (path_check_good(p, initial)) { | |
f2341e0a | 520 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
521 | path_enter_running(p); |
522 | return; | |
523 | } | |
524 | ||
e0207c8d ZJS |
525 | r = path_watch(p); |
526 | if (r < 0) | |
ac3f50ca LP |
527 | goto fail; |
528 | ||
529 | /* Hmm, so now we have created inotify watches, but the file | |
530 | * might have appeared/been removed by now, so we must | |
531 | * recheck */ | |
532 | ||
533 | if (recheck) | |
534 | if (path_check_good(p, false)) { | |
f2341e0a | 535 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
536 | path_enter_running(p); |
537 | return; | |
538 | } | |
01f78473 LP |
539 | |
540 | path_set_state(p, PATH_WAITING); | |
541 | return; | |
542 | ||
543 | fail: | |
f2341e0a | 544 | log_unit_warning_errno(UNIT(p), r, "Failed to enter waiting state: %m"); |
cd43ca73 | 545 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
546 | } |
547 | ||
0e456f97 LP |
548 | static void path_mkdir(Path *p) { |
549 | PathSpec *s; | |
550 | ||
551 | assert(p); | |
552 | ||
553 | if (!p->make_directory) | |
554 | return; | |
555 | ||
4b562198 | 556 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 557 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
558 | } |
559 | ||
01f78473 LP |
560 | static int path_start(Unit *u) { |
561 | Path *p = PATH(u); | |
e903182e | 562 | Unit *trigger; |
01f78473 LP |
563 | |
564 | assert(p); | |
fdf20a31 | 565 | assert(p->state == PATH_DEAD || p->state == PATH_FAILED); |
01f78473 | 566 | |
e903182e LP |
567 | trigger = UNIT_TRIGGER(u); |
568 | if (!trigger || trigger->load_state != UNIT_LOADED) { | |
569 | log_unit_error(u, "Refusing to start, unit to trigger not loaded."); | |
01f78473 | 570 | return -ENOENT; |
e903182e | 571 | } |
01f78473 | 572 | |
0e456f97 LP |
573 | path_mkdir(p); |
574 | ||
cd43ca73 | 575 | p->result = PATH_SUCCESS; |
ac3f50ca | 576 | path_enter_waiting(p, true, true); |
00dc5d76 | 577 | |
82a2b6bb | 578 | return 1; |
01f78473 LP |
579 | } |
580 | ||
581 | static int path_stop(Unit *u) { | |
582 | Path *p = PATH(u); | |
583 | ||
584 | assert(p); | |
585 | assert(p->state == PATH_WAITING || p->state == PATH_RUNNING); | |
586 | ||
cd43ca73 | 587 | path_enter_dead(p, PATH_SUCCESS); |
82a2b6bb | 588 | return 1; |
01f78473 LP |
589 | } |
590 | ||
591 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
592 | Path *p = PATH(u); | |
593 | ||
594 | assert(u); | |
595 | assert(f); | |
596 | assert(fds); | |
597 | ||
598 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 599 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
600 | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
605 | Path *p = PATH(u); | |
606 | ||
607 | assert(u); | |
608 | assert(key); | |
609 | assert(value); | |
610 | assert(fds); | |
611 | ||
612 | if (streq(key, "state")) { | |
613 | PathState state; | |
614 | ||
e0207c8d ZJS |
615 | state = path_state_from_string(value); |
616 | if (state < 0) | |
f2341e0a | 617 | log_unit_debug(u, "Failed to parse state value: %s", value); |
01f78473 LP |
618 | else |
619 | p->deserialized_state = state; | |
cd43ca73 LP |
620 | |
621 | } else if (streq(key, "result")) { | |
622 | PathResult f; | |
623 | ||
624 | f = path_result_from_string(value); | |
625 | if (f < 0) | |
f2341e0a | 626 | log_unit_debug(u, "Failed to parse result value: %s", value); |
cd43ca73 LP |
627 | else if (f != PATH_SUCCESS) |
628 | p->result = f; | |
629 | ||
01f78473 | 630 | } else |
f2341e0a | 631 | log_unit_debug(u, "Unknown serialization key: %s", key); |
01f78473 LP |
632 | |
633 | return 0; | |
634 | } | |
635 | ||
44a6b1b6 | 636 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
637 | assert(u); |
638 | ||
639 | return state_translation_table[PATH(u)->state]; | |
640 | } | |
641 | ||
44a6b1b6 | 642 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
643 | assert(u); |
644 | ||
645 | return path_state_to_string(PATH(u)->state); | |
646 | } | |
647 | ||
718db961 LP |
648 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
649 | PathSpec *s = userdata; | |
650 | Path *p; | |
4b562198 | 651 | int changed; |
01f78473 | 652 | |
718db961 LP |
653 | assert(s); |
654 | assert(s->unit); | |
01f78473 LP |
655 | assert(fd >= 0); |
656 | ||
718db961 LP |
657 | p = PATH(s->unit); |
658 | ||
672028dc LP |
659 | if (p->state != PATH_WAITING && |
660 | p->state != PATH_RUNNING) | |
718db961 | 661 | return 0; |
01f78473 | 662 | |
ac155bb8 | 663 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 664 | |
01f78473 | 665 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 666 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
667 | break; |
668 | ||
669 | if (!s) { | |
670 | log_error("Got event on unknown fd."); | |
671 | goto fail; | |
672 | } | |
673 | ||
718db961 | 674 | changed = path_spec_fd_event(s, revents); |
4b562198 | 675 | if (changed < 0) |
01f78473 | 676 | goto fail; |
01f78473 | 677 | |
672028dc LP |
678 | /* If we are already running, then remember that one event was |
679 | * dispatched so that we restart the service only if something | |
680 | * actually changed on disk */ | |
681 | p->inotify_triggered = true; | |
682 | ||
672028dc LP |
683 | if (changed) |
684 | path_enter_running(p); | |
685 | else | |
ac3f50ca | 686 | path_enter_waiting(p, false, true); |
672028dc | 687 | |
718db961 | 688 | return 0; |
01f78473 LP |
689 | |
690 | fail: | |
cd43ca73 | 691 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 692 | return 0; |
01f78473 LP |
693 | } |
694 | ||
3ecaa09b LP |
695 | static void path_trigger_notify(Unit *u, Unit *other) { |
696 | Path *p = PATH(u); | |
01f78473 | 697 | |
3ecaa09b LP |
698 | assert(u); |
699 | assert(other); | |
01f78473 | 700 | |
3ecaa09b LP |
701 | /* Invoked whenever the unit we trigger changes state or gains |
702 | * or loses a job */ | |
01f78473 | 703 | |
3ecaa09b LP |
704 | if (other->load_state != UNIT_LOADED) |
705 | return; | |
01f78473 | 706 | |
3ecaa09b LP |
707 | if (p->state == PATH_RUNNING && |
708 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
f2341e0a | 709 | log_unit_debug(UNIT(p), "Got notified about unit deactivation."); |
672028dc | 710 | |
3ecaa09b LP |
711 | /* Hmm, so inotify was triggered since the |
712 | * last activation, so I guess we need to | |
713 | * recheck what is going on. */ | |
714 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 715 | } |
01f78473 LP |
716 | } |
717 | ||
fdf20a31 | 718 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
719 | Path *p = PATH(u); |
720 | ||
721 | assert(p); | |
722 | ||
fdf20a31 | 723 | if (p->state == PATH_FAILED) |
5632e374 LP |
724 | path_set_state(p, PATH_DEAD); |
725 | ||
cd43ca73 | 726 | p->result = PATH_SUCCESS; |
5632e374 LP |
727 | } |
728 | ||
01f78473 LP |
729 | static const char* const path_type_table[_PATH_TYPE_MAX] = { |
730 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 731 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 732 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 733 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 734 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
735 | }; |
736 | ||
737 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
738 | ||
cd43ca73 LP |
739 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
740 | [PATH_SUCCESS] = "success", | |
2c5859af | 741 | [PATH_FAILURE_RESOURCES] = "resources", |
cd43ca73 LP |
742 | }; |
743 | ||
744 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
745 | ||
01f78473 | 746 | const UnitVTable path_vtable = { |
7d17cfbc | 747 | .object_size = sizeof(Path), |
718db961 | 748 | |
f975e971 LP |
749 | .sections = |
750 | "Unit\0" | |
751 | "Path\0" | |
752 | "Install\0", | |
01f78473 | 753 | |
0e456f97 | 754 | .init = path_init, |
01f78473 LP |
755 | .done = path_done, |
756 | .load = path_load, | |
757 | ||
758 | .coldplug = path_coldplug, | |
759 | ||
760 | .dump = path_dump, | |
761 | ||
762 | .start = path_start, | |
763 | .stop = path_stop, | |
764 | ||
765 | .serialize = path_serialize, | |
766 | .deserialize_item = path_deserialize_item, | |
767 | ||
768 | .active_state = path_active_state, | |
769 | .sub_state_to_string = path_sub_state_to_string, | |
770 | ||
3ecaa09b LP |
771 | .trigger_notify = path_trigger_notify, |
772 | ||
fdf20a31 | 773 | .reset_failed = path_reset_failed, |
5632e374 | 774 | |
aec8de63 | 775 | .bus_vtable = bus_path_vtable |
01f78473 | 776 | }; |