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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
01f78473 | 2 | |
01f78473 | 3 | #include <errno.h> |
07630cea LP |
4 | #include <sys/epoll.h> |
5 | #include <sys/inotify.h> | |
01f78473 LP |
6 | #include <unistd.h> |
7 | ||
07630cea LP |
8 | #include "bus-error.h" |
9 | #include "bus-util.h" | |
01f78473 | 10 | #include "dbus-path.h" |
6fcbec6f | 11 | #include "dbus-unit.h" |
3ffd4af2 | 12 | #include "fd-util.h" |
77601719 | 13 | #include "fs-util.h" |
7d50b32a | 14 | #include "glob-util.h" |
f8c16f42 | 15 | #include "macro.h" |
07630cea | 16 | #include "mkdir.h" |
3ffd4af2 | 17 | #include "path.h" |
d68c645b | 18 | #include "serialize.h" |
07630cea | 19 | #include "special.h" |
8fcde012 | 20 | #include "stat-util.h" |
8b43440b | 21 | #include "string-table.h" |
07630cea LP |
22 | #include "string-util.h" |
23 | #include "unit-name.h" | |
24 | #include "unit.h" | |
01f78473 LP |
25 | |
26 | static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { | |
27 | [PATH_DEAD] = UNIT_INACTIVE, | |
28 | [PATH_WAITING] = UNIT_ACTIVE, | |
29 | [PATH_RUNNING] = UNIT_ACTIVE, | |
fdf20a31 | 30 | [PATH_FAILED] = UNIT_FAILED |
01f78473 LP |
31 | }; |
32 | ||
718db961 LP |
33 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
34 | ||
35 | int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) { | |
57020a3a | 36 | |
4b562198 MS |
37 | static const int flags_table[_PATH_TYPE_MAX] = { |
38 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
39 | [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
40 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
e9223856 | 41 | [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 |
42 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO |
43 | }; | |
44 | ||
45 | bool exists = false; | |
bc41f93e | 46 | char *slash, *oldslash = NULL; |
4b562198 | 47 | int r; |
0e456f97 | 48 | |
4b562198 | 49 | assert(s); |
718db961 LP |
50 | assert(s->unit); |
51 | assert(handler); | |
0e456f97 | 52 | |
718db961 | 53 | path_spec_unwatch(s); |
4b562198 | 54 | |
f8c16f42 ZJS |
55 | s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
56 | if (s->inotify_fd < 0) { | |
4b562198 MS |
57 | r = -errno; |
58 | goto fail; | |
59 | } | |
60 | ||
151b9b96 | 61 | r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s); |
f8c16f42 | 62 | if (r < 0) |
4b562198 | 63 | goto fail; |
4b562198 | 64 | |
7dfbe2e3 TG |
65 | (void) sd_event_source_set_description(s->event_source, "path"); |
66 | ||
858d36c1 | 67 | /* This function assumes the path was passed through path_simplify()! */ |
80127127 | 68 | assert(!strstr(s->path, "//")); |
4b562198 | 69 | |
180d6802 MS |
70 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { |
71 | char *cut = NULL; | |
4b562198 | 72 | int flags; |
bc41f93e ZJS |
73 | char tmp; |
74 | ||
75 | if (slash) { | |
180d6802 MS |
76 | cut = slash + (slash == s->path); |
77 | tmp = *cut; | |
78 | *cut = '\0'; | |
79 | ||
bc41f93e | 80 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; |
180d6802 | 81 | } else |
bc41f93e | 82 | flags = flags_table[s->type]; |
4b562198 | 83 | |
180d6802 | 84 | r = inotify_add_watch(s->inotify_fd, s->path, flags); |
bc41f93e | 85 | if (r < 0) { |
3742095b | 86 | if (IN_SET(errno, EACCES, ENOENT)) { |
180d6802 MS |
87 | if (cut) |
88 | *cut = tmp; | |
bc41f93e | 89 | break; |
180d6802 | 90 | } |
4b562198 | 91 | |
f2341e0a | 92 | r = log_warning_errno(errno, "Failed to add watch on %s: %s", s->path, errno == ENOSPC ? "too many watches" : strerror(-r)); |
180d6802 MS |
93 | if (cut) |
94 | *cut = tmp; | |
28a79bd2 | 95 | goto fail; |
bc41f93e ZJS |
96 | } else { |
97 | exists = true; | |
98 | ||
edfd706d | 99 | /* Path exists, we don't need to watch parent too closely. */ |
bc41f93e | 100 | if (oldslash) { |
180d6802 MS |
101 | char *cut2 = oldslash + (oldslash == s->path); |
102 | char tmp2 = *cut2; | |
103 | *cut2 = '\0'; | |
bc41f93e | 104 | |
edfd706d ZJS |
105 | (void) inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); |
106 | /* Error is ignored, the worst can happen is we get spurious events. */ | |
bc41f93e | 107 | |
180d6802 | 108 | *cut2 = tmp2; |
bc41f93e | 109 | } |
28a79bd2 | 110 | } |
bc41f93e | 111 | |
180d6802 MS |
112 | if (cut) |
113 | *cut = tmp; | |
114 | ||
115 | if (slash) | |
bc41f93e | 116 | oldslash = slash; |
180d6802 | 117 | else { |
bc41f93e ZJS |
118 | /* whole path has been iterated over */ |
119 | s->primary_wd = r; | |
120 | break; | |
121 | } | |
122 | } | |
123 | ||
28a79bd2 | 124 | if (!exists) { |
f2341e0a LP |
125 | r = log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", s->path); |
126 | /* either EACCESS or ENOENT */ | |
28a79bd2 ZJS |
127 | goto fail; |
128 | } | |
129 | ||
4b562198 MS |
130 | return 0; |
131 | ||
132 | fail: | |
718db961 | 133 | path_spec_unwatch(s); |
4b562198 | 134 | return r; |
0e456f97 LP |
135 | } |
136 | ||
718db961 LP |
137 | void path_spec_unwatch(PathSpec *s) { |
138 | assert(s); | |
62347bc2 | 139 | |
718db961 | 140 | s->event_source = sd_event_source_unref(s->event_source); |
03e334a1 | 141 | s->inotify_fd = safe_close(s->inotify_fd); |
62347bc2 LP |
142 | } |
143 | ||
718db961 | 144 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { |
0254e944 | 145 | union inotify_event_buffer buffer; |
4b562198 | 146 | struct inotify_event *e; |
f7c1ad4f | 147 | ssize_t l; |
4b562198 MS |
148 | int r = 0; |
149 | ||
baaa35ad ZJS |
150 | if (revents != EPOLLIN) |
151 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
152 | "Got invalid poll event on inotify."); | |
4b562198 | 153 | |
0254e944 | 154 | l = read(s->inotify_fd, &buffer, sizeof(buffer)); |
f7c1ad4f | 155 | if (l < 0) { |
3742095b | 156 | if (IN_SET(errno, EAGAIN, EINTR)) |
f7c1ad4f | 157 | return 0; |
4b562198 | 158 | |
4a62c710 | 159 | return log_error_errno(errno, "Failed to read inotify event: %m"); |
f7c1ad4f | 160 | } |
4b562198 | 161 | |
f7c1ad4f | 162 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
3742095b | 163 | if (IN_SET(s->type, PATH_CHANGED, PATH_MODIFIED) && |
714d943f | 164 | s->primary_wd == e->wd) |
4b562198 | 165 | r = 1; |
4b562198 | 166 | } |
a163db44 | 167 | |
4b562198 MS |
168 | return r; |
169 | } | |
170 | ||
57020a3a | 171 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
172 | bool good = false; |
173 | ||
174 | switch (s->type) { | |
175 | ||
176 | case PATH_EXISTS: | |
177 | good = access(s->path, F_OK) >= 0; | |
178 | break; | |
179 | ||
180 | case PATH_EXISTS_GLOB: | |
181 | good = glob_exists(s->path) > 0; | |
182 | break; | |
183 | ||
184 | case PATH_DIRECTORY_NOT_EMPTY: { | |
185 | int k; | |
186 | ||
187 | k = dir_is_empty(s->path); | |
188 | good = !(k == -ENOENT || k > 0); | |
189 | break; | |
190 | } | |
191 | ||
714d943f MS |
192 | case PATH_CHANGED: |
193 | case PATH_MODIFIED: { | |
4b562198 MS |
194 | bool b; |
195 | ||
196 | b = access(s->path, F_OK) >= 0; | |
197 | good = !initial && b != s->previous_exists; | |
198 | s->previous_exists = b; | |
199 | break; | |
200 | } | |
201 | ||
202 | default: | |
203 | ; | |
204 | } | |
205 | ||
206 | return good; | |
207 | } | |
208 | ||
57020a3a | 209 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
210 | int r; |
211 | ||
3742095b | 212 | if (IN_SET(s->type, PATH_EXISTS, PATH_EXISTS_GLOB)) |
4b562198 MS |
213 | return; |
214 | ||
15f55e80 ZJS |
215 | r = mkdir_p_label(s->path, mode); |
216 | if (r < 0) | |
da927ba9 | 217 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
218 | } |
219 | ||
57020a3a | 220 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
221 | fprintf(f, |
222 | "%s%s: %s\n", | |
223 | prefix, | |
224 | path_type_to_string(s->type), | |
225 | s->path); | |
226 | } | |
227 | ||
57020a3a LP |
228 | void path_spec_done(PathSpec *s) { |
229 | assert(s); | |
4b562198 | 230 | assert(s->inotify_fd == -1); |
57020a3a | 231 | |
4b562198 MS |
232 | free(s->path); |
233 | } | |
234 | ||
235 | static void path_init(Unit *u) { | |
236 | Path *p = PATH(u); | |
237 | ||
238 | assert(u); | |
ac155bb8 | 239 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
240 | |
241 | p->directory_mode = 0755; | |
242 | } | |
243 | ||
74051b9b | 244 | void path_free_specs(Path *p) { |
01f78473 LP |
245 | PathSpec *s; |
246 | ||
247 | assert(p); | |
248 | ||
249 | while ((s = p->specs)) { | |
718db961 | 250 | path_spec_unwatch(s); |
71fda00f | 251 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 252 | path_spec_done(s); |
01f78473 LP |
253 | free(s); |
254 | } | |
255 | } | |
256 | ||
74051b9b LP |
257 | static void path_done(Unit *u) { |
258 | Path *p = PATH(u); | |
259 | ||
260 | assert(p); | |
261 | ||
74051b9b LP |
262 | path_free_specs(p); |
263 | } | |
264 | ||
eef85c4a | 265 | static int path_add_mount_dependencies(Path *p) { |
01f78473 LP |
266 | PathSpec *s; |
267 | int r; | |
268 | ||
269 | assert(p); | |
01f78473 LP |
270 | |
271 | LIST_FOREACH(spec, s, p->specs) { | |
eef85c4a | 272 | r = unit_require_mounts_for(UNIT(p), s->path, UNIT_DEPENDENCY_FILE); |
e0207c8d | 273 | if (r < 0) |
01f78473 | 274 | return r; |
e0207c8d | 275 | } |
01f78473 LP |
276 | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static int path_verify(Path *p) { | |
281 | assert(p); | |
282 | ||
1124fe6f | 283 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
284 | return 0; |
285 | ||
286 | if (!p->specs) { | |
f2341e0a | 287 | log_unit_error(UNIT(p), "Path unit lacks path setting. Refusing."); |
6f40aa45 | 288 | return -ENOEXEC; |
01f78473 LP |
289 | } |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
6c155fe3 LP |
294 | static int path_add_default_dependencies(Path *p) { |
295 | int r; | |
296 | ||
297 | assert(p); | |
298 | ||
4c9ea260 LP |
299 | if (!UNIT(p)->default_dependencies) |
300 | return 0; | |
301 | ||
35d8c19a | 302 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_PATHS_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
e3d84721 LP |
303 | if (r < 0) |
304 | return r; | |
2a77d31d | 305 | |
463d0d15 | 306 | if (MANAGER_IS_SYSTEM(UNIT(p)->manager)) { |
5a724170 | 307 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
e0207c8d | 308 | if (r < 0) |
6c155fe3 | 309 | return r; |
2a77d31d | 310 | } |
6c155fe3 | 311 | |
5a724170 | 312 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
eef85c4a LP |
313 | } |
314 | ||
315 | static int path_add_trigger_dependencies(Path *p) { | |
316 | Unit *x; | |
317 | int r; | |
318 | ||
319 | assert(p); | |
320 | ||
321 | if (!hashmap_isempty(UNIT(p)->dependencies[UNIT_TRIGGERS])) | |
322 | return 0; | |
323 | ||
324 | r = unit_load_related_unit(UNIT(p), ".service", &x); | |
325 | if (r < 0) | |
326 | return r; | |
327 | ||
328 | return unit_add_two_dependencies(UNIT(p), UNIT_BEFORE, UNIT_TRIGGERS, x, true, UNIT_DEPENDENCY_IMPLICIT); | |
6c155fe3 LP |
329 | } |
330 | ||
01f78473 LP |
331 | static int path_load(Unit *u) { |
332 | Path *p = PATH(u); | |
333 | int r; | |
334 | ||
335 | assert(u); | |
ac155bb8 | 336 | assert(u->load_state == UNIT_STUB); |
01f78473 | 337 | |
e0207c8d ZJS |
338 | r = unit_load_fragment_and_dropin(u); |
339 | if (r < 0) | |
01f78473 LP |
340 | return r; |
341 | ||
ac155bb8 | 342 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 343 | |
eef85c4a LP |
344 | r = path_add_trigger_dependencies(p); |
345 | if (r < 0) | |
346 | return r; | |
57020a3a | 347 | |
eef85c4a | 348 | r = path_add_mount_dependencies(p); |
e0207c8d | 349 | if (r < 0) |
01f78473 | 350 | return r; |
a40eb732 | 351 | |
4c9ea260 LP |
352 | r = path_add_default_dependencies(p); |
353 | if (r < 0) | |
354 | return r; | |
01f78473 LP |
355 | } |
356 | ||
357 | return path_verify(p); | |
358 | } | |
359 | ||
360 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
361 | Path *p = PATH(u); | |
3ecaa09b | 362 | Unit *trigger; |
01f78473 LP |
363 | PathSpec *s; |
364 | ||
e364ad06 LP |
365 | assert(p); |
366 | assert(f); | |
01f78473 | 367 | |
3ecaa09b LP |
368 | trigger = UNIT_TRIGGER(u); |
369 | ||
01f78473 LP |
370 | fprintf(f, |
371 | "%sPath State: %s\n" | |
cd43ca73 | 372 | "%sResult: %s\n" |
0e456f97 LP |
373 | "%sUnit: %s\n" |
374 | "%sMakeDirectory: %s\n" | |
375 | "%sDirectoryMode: %04o\n", | |
01f78473 | 376 | prefix, path_state_to_string(p->state), |
cd43ca73 | 377 | prefix, path_result_to_string(p->result), |
3ecaa09b | 378 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
379 | prefix, yes_no(p->make_directory), |
380 | prefix, p->directory_mode); | |
01f78473 LP |
381 | |
382 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 383 | path_spec_dump(s, f, prefix); |
01f78473 LP |
384 | } |
385 | ||
386 | static void path_unwatch(Path *p) { | |
387 | PathSpec *s; | |
388 | ||
389 | assert(p); | |
390 | ||
391 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 392 | path_spec_unwatch(s); |
01f78473 LP |
393 | } |
394 | ||
395 | static int path_watch(Path *p) { | |
396 | int r; | |
397 | PathSpec *s; | |
398 | ||
399 | assert(p); | |
400 | ||
e0207c8d | 401 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 402 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 403 | if (r < 0) |
01f78473 | 404 | return r; |
e0207c8d | 405 | } |
01f78473 LP |
406 | |
407 | return 0; | |
408 | } | |
409 | ||
410 | static void path_set_state(Path *p, PathState state) { | |
411 | PathState old_state; | |
412 | assert(p); | |
413 | ||
6fcbec6f LP |
414 | if (p->state != state) |
415 | bus_unit_send_pending_change_signal(UNIT(p), false); | |
416 | ||
01f78473 LP |
417 | old_state = p->state; |
418 | p->state = state; | |
419 | ||
672028dc LP |
420 | if (state != PATH_WAITING && |
421 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
422 | path_unwatch(p); |
423 | ||
424 | if (state != old_state) | |
3541bf1f | 425 | log_unit_debug(UNIT(p), "Changed %s -> %s", path_state_to_string(old_state), path_state_to_string(state)); |
01f78473 | 426 | |
2ad2e41a | 427 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], 0); |
01f78473 LP |
428 | } |
429 | ||
ac3f50ca | 430 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 | 431 | |
be847e82 | 432 | static int path_coldplug(Unit *u) { |
01f78473 LP |
433 | Path *p = PATH(u); |
434 | ||
435 | assert(p); | |
436 | assert(p->state == PATH_DEAD); | |
437 | ||
438 | if (p->deserialized_state != p->state) { | |
439 | ||
3742095b | 440 | if (IN_SET(p->deserialized_state, PATH_WAITING, PATH_RUNNING)) |
be847e82 LP |
441 | path_enter_waiting(p, true, true); |
442 | else | |
01f78473 LP |
443 | path_set_state(p, p->deserialized_state); |
444 | } | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
cd43ca73 | 449 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
450 | assert(p); |
451 | ||
a0fef983 | 452 | if (p->result == PATH_SUCCESS) |
cd43ca73 | 453 | p->result = f; |
01f78473 | 454 | |
aac99f30 | 455 | unit_log_result(UNIT(p), p->result == PATH_SUCCESS, path_result_to_string(p->result)); |
cd43ca73 | 456 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
457 | } |
458 | ||
459 | static void path_enter_running(Path *p) { | |
4afd3348 | 460 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
e903182e | 461 | Unit *trigger; |
01f78473 | 462 | int r; |
398ef8ba | 463 | |
01f78473 | 464 | assert(p); |
3ecaa09b | 465 | |
ba3e67a7 | 466 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 467 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
468 | return; |
469 | ||
e903182e LP |
470 | trigger = UNIT_TRIGGER(UNIT(p)); |
471 | if (!trigger) { | |
472 | log_unit_error(UNIT(p), "Unit to trigger vanished."); | |
9e4942ed | 473 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
e903182e LP |
474 | return; |
475 | } | |
476 | ||
477 | r = manager_add_job(UNIT(p)->manager, JOB_START, trigger, JOB_REPLACE, &error, NULL); | |
e0207c8d | 478 | if (r < 0) |
01f78473 LP |
479 | goto fail; |
480 | ||
672028dc LP |
481 | p->inotify_triggered = false; |
482 | ||
e0207c8d ZJS |
483 | r = path_watch(p); |
484 | if (r < 0) | |
672028dc LP |
485 | goto fail; |
486 | ||
01f78473 LP |
487 | path_set_state(p, PATH_RUNNING); |
488 | return; | |
489 | ||
490 | fail: | |
f2341e0a | 491 | log_unit_warning(UNIT(p), "Failed to queue unit startup job: %s", bus_error_message(&error, r)); |
cd43ca73 | 492 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
493 | } |
494 | ||
ac3f50ca | 495 | static bool path_check_good(Path *p, bool initial) { |
01f78473 | 496 | PathSpec *s; |
01f78473 LP |
497 | bool good = false; |
498 | ||
ac3f50ca | 499 | assert(p); |
672028dc | 500 | |
01f78473 | 501 | LIST_FOREACH(spec, s, p->specs) { |
57020a3a | 502 | good = path_spec_check_good(s, initial); |
01f78473 LP |
503 | |
504 | if (good) | |
505 | break; | |
506 | } | |
507 | ||
ac3f50ca LP |
508 | return good; |
509 | } | |
01f78473 | 510 | |
ac3f50ca LP |
511 | static void path_enter_waiting(Path *p, bool initial, bool recheck) { |
512 | int r; | |
0595f9a1 | 513 | |
ac3f50ca LP |
514 | if (recheck) |
515 | if (path_check_good(p, initial)) { | |
f2341e0a | 516 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
517 | path_enter_running(p); |
518 | return; | |
519 | } | |
520 | ||
e0207c8d ZJS |
521 | r = path_watch(p); |
522 | if (r < 0) | |
ac3f50ca LP |
523 | goto fail; |
524 | ||
525 | /* Hmm, so now we have created inotify watches, but the file | |
526 | * might have appeared/been removed by now, so we must | |
527 | * recheck */ | |
528 | ||
529 | if (recheck) | |
530 | if (path_check_good(p, false)) { | |
f2341e0a | 531 | log_unit_debug(UNIT(p), "Got triggered."); |
ac3f50ca LP |
532 | path_enter_running(p); |
533 | return; | |
534 | } | |
01f78473 LP |
535 | |
536 | path_set_state(p, PATH_WAITING); | |
537 | return; | |
538 | ||
539 | fail: | |
f2341e0a | 540 | log_unit_warning_errno(UNIT(p), r, "Failed to enter waiting state: %m"); |
cd43ca73 | 541 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
542 | } |
543 | ||
0e456f97 LP |
544 | static void path_mkdir(Path *p) { |
545 | PathSpec *s; | |
546 | ||
547 | assert(p); | |
548 | ||
549 | if (!p->make_directory) | |
550 | return; | |
551 | ||
4b562198 | 552 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 553 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
554 | } |
555 | ||
01f78473 LP |
556 | static int path_start(Unit *u) { |
557 | Path *p = PATH(u); | |
e903182e | 558 | Unit *trigger; |
07299350 | 559 | int r; |
01f78473 LP |
560 | |
561 | assert(p); | |
3742095b | 562 | assert(IN_SET(p->state, PATH_DEAD, PATH_FAILED)); |
01f78473 | 563 | |
e903182e LP |
564 | trigger = UNIT_TRIGGER(u); |
565 | if (!trigger || trigger->load_state != UNIT_LOADED) { | |
566 | log_unit_error(u, "Refusing to start, unit to trigger not loaded."); | |
01f78473 | 567 | return -ENOENT; |
e903182e | 568 | } |
01f78473 | 569 | |
07299350 LP |
570 | r = unit_start_limit_test(u); |
571 | if (r < 0) { | |
572 | path_enter_dead(p, PATH_FAILURE_START_LIMIT_HIT); | |
573 | return r; | |
574 | } | |
575 | ||
4b58153d LP |
576 | r = unit_acquire_invocation_id(u); |
577 | if (r < 0) | |
578 | return r; | |
579 | ||
0e456f97 LP |
580 | path_mkdir(p); |
581 | ||
cd43ca73 | 582 | p->result = PATH_SUCCESS; |
ac3f50ca | 583 | path_enter_waiting(p, true, true); |
00dc5d76 | 584 | |
82a2b6bb | 585 | return 1; |
01f78473 LP |
586 | } |
587 | ||
588 | static int path_stop(Unit *u) { | |
589 | Path *p = PATH(u); | |
590 | ||
591 | assert(p); | |
3742095b | 592 | assert(IN_SET(p->state, PATH_WAITING, PATH_RUNNING)); |
01f78473 | 593 | |
cd43ca73 | 594 | path_enter_dead(p, PATH_SUCCESS); |
82a2b6bb | 595 | return 1; |
01f78473 LP |
596 | } |
597 | ||
598 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
599 | Path *p = PATH(u); | |
600 | ||
601 | assert(u); | |
602 | assert(f); | |
603 | assert(fds); | |
604 | ||
d68c645b LP |
605 | (void) serialize_item(f, "state", path_state_to_string(p->state)); |
606 | (void) serialize_item(f, "result", path_result_to_string(p->result)); | |
01f78473 LP |
607 | |
608 | return 0; | |
609 | } | |
610 | ||
611 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
612 | Path *p = PATH(u); | |
613 | ||
614 | assert(u); | |
615 | assert(key); | |
616 | assert(value); | |
617 | assert(fds); | |
618 | ||
619 | if (streq(key, "state")) { | |
620 | PathState state; | |
621 | ||
e0207c8d ZJS |
622 | state = path_state_from_string(value); |
623 | if (state < 0) | |
f2341e0a | 624 | log_unit_debug(u, "Failed to parse state value: %s", value); |
01f78473 LP |
625 | else |
626 | p->deserialized_state = state; | |
cd43ca73 LP |
627 | |
628 | } else if (streq(key, "result")) { | |
629 | PathResult f; | |
630 | ||
631 | f = path_result_from_string(value); | |
632 | if (f < 0) | |
f2341e0a | 633 | log_unit_debug(u, "Failed to parse result value: %s", value); |
cd43ca73 LP |
634 | else if (f != PATH_SUCCESS) |
635 | p->result = f; | |
636 | ||
01f78473 | 637 | } else |
f2341e0a | 638 | log_unit_debug(u, "Unknown serialization key: %s", key); |
01f78473 LP |
639 | |
640 | return 0; | |
641 | } | |
642 | ||
44a6b1b6 | 643 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
644 | assert(u); |
645 | ||
646 | return state_translation_table[PATH(u)->state]; | |
647 | } | |
648 | ||
44a6b1b6 | 649 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
650 | assert(u); |
651 | ||
652 | return path_state_to_string(PATH(u)->state); | |
653 | } | |
654 | ||
718db961 LP |
655 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
656 | PathSpec *s = userdata; | |
657 | Path *p; | |
4b562198 | 658 | int changed; |
01f78473 | 659 | |
718db961 LP |
660 | assert(s); |
661 | assert(s->unit); | |
01f78473 LP |
662 | assert(fd >= 0); |
663 | ||
718db961 LP |
664 | p = PATH(s->unit); |
665 | ||
ec2ce0c5 | 666 | if (!IN_SET(p->state, PATH_WAITING, PATH_RUNNING)) |
718db961 | 667 | return 0; |
01f78473 | 668 | |
ac155bb8 | 669 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 670 | |
01f78473 | 671 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 672 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
673 | break; |
674 | ||
675 | if (!s) { | |
676 | log_error("Got event on unknown fd."); | |
677 | goto fail; | |
678 | } | |
679 | ||
718db961 | 680 | changed = path_spec_fd_event(s, revents); |
4b562198 | 681 | if (changed < 0) |
01f78473 | 682 | goto fail; |
01f78473 | 683 | |
672028dc LP |
684 | /* If we are already running, then remember that one event was |
685 | * dispatched so that we restart the service only if something | |
686 | * actually changed on disk */ | |
687 | p->inotify_triggered = true; | |
688 | ||
672028dc LP |
689 | if (changed) |
690 | path_enter_running(p); | |
691 | else | |
ac3f50ca | 692 | path_enter_waiting(p, false, true); |
672028dc | 693 | |
718db961 | 694 | return 0; |
01f78473 LP |
695 | |
696 | fail: | |
cd43ca73 | 697 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 698 | return 0; |
01f78473 LP |
699 | } |
700 | ||
3ecaa09b LP |
701 | static void path_trigger_notify(Unit *u, Unit *other) { |
702 | Path *p = PATH(u); | |
01f78473 | 703 | |
3ecaa09b LP |
704 | assert(u); |
705 | assert(other); | |
01f78473 | 706 | |
3ecaa09b LP |
707 | /* Invoked whenever the unit we trigger changes state or gains |
708 | * or loses a job */ | |
01f78473 | 709 | |
3ecaa09b LP |
710 | if (other->load_state != UNIT_LOADED) |
711 | return; | |
01f78473 | 712 | |
3ecaa09b LP |
713 | if (p->state == PATH_RUNNING && |
714 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
f2341e0a | 715 | log_unit_debug(UNIT(p), "Got notified about unit deactivation."); |
672028dc | 716 | |
3ecaa09b LP |
717 | /* Hmm, so inotify was triggered since the |
718 | * last activation, so I guess we need to | |
719 | * recheck what is going on. */ | |
720 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 721 | } |
01f78473 LP |
722 | } |
723 | ||
fdf20a31 | 724 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
725 | Path *p = PATH(u); |
726 | ||
727 | assert(p); | |
728 | ||
fdf20a31 | 729 | if (p->state == PATH_FAILED) |
5632e374 LP |
730 | path_set_state(p, PATH_DEAD); |
731 | ||
cd43ca73 | 732 | p->result = PATH_SUCCESS; |
5632e374 LP |
733 | } |
734 | ||
01f78473 LP |
735 | static const char* const path_type_table[_PATH_TYPE_MAX] = { |
736 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 737 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 738 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 739 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 740 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
741 | }; |
742 | ||
743 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
744 | ||
cd43ca73 LP |
745 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
746 | [PATH_SUCCESS] = "success", | |
2c5859af | 747 | [PATH_FAILURE_RESOURCES] = "resources", |
07299350 | 748 | [PATH_FAILURE_START_LIMIT_HIT] = "start-limit-hit", |
cd43ca73 LP |
749 | }; |
750 | ||
751 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
752 | ||
01f78473 | 753 | const UnitVTable path_vtable = { |
7d17cfbc | 754 | .object_size = sizeof(Path), |
718db961 | 755 | |
f975e971 LP |
756 | .sections = |
757 | "Unit\0" | |
758 | "Path\0" | |
759 | "Install\0", | |
5b9fbf89 YW |
760 | .private_section = "Path", |
761 | ||
762 | .can_transient = true, | |
01f78473 | 763 | |
0e456f97 | 764 | .init = path_init, |
01f78473 LP |
765 | .done = path_done, |
766 | .load = path_load, | |
767 | ||
768 | .coldplug = path_coldplug, | |
769 | ||
770 | .dump = path_dump, | |
771 | ||
772 | .start = path_start, | |
773 | .stop = path_stop, | |
774 | ||
775 | .serialize = path_serialize, | |
776 | .deserialize_item = path_deserialize_item, | |
777 | ||
778 | .active_state = path_active_state, | |
779 | .sub_state_to_string = path_sub_state_to_string, | |
780 | ||
3ecaa09b LP |
781 | .trigger_notify = path_trigger_notify, |
782 | ||
fdf20a31 | 783 | .reset_failed = path_reset_failed, |
5632e374 | 784 | |
5b9fbf89 YW |
785 | .bus_vtable = bus_path_vtable, |
786 | .bus_set_property = bus_path_set_property, | |
01f78473 | 787 | }; |