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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
01f78473 | 2 | /*** |
01f78473 | 3 | Copyright 2010 Lennart Poettering |
01f78473 LP |
4 | ***/ |
5 | ||
01f78473 | 6 | #include <errno.h> |
07630cea LP |
7 | #include <sys/epoll.h> |
8 | #include <sys/inotify.h> | |
01f78473 LP |
9 | #include <unistd.h> |
10 | ||
07630cea LP |
11 | #include "bus-error.h" |
12 | #include "bus-util.h" | |
01f78473 | 13 | #include "dbus-path.h" |
3ffd4af2 | 14 | #include "fd-util.h" |
77601719 | 15 | #include "fs-util.h" |
7d50b32a | 16 | #include "glob-util.h" |
f8c16f42 | 17 | #include "macro.h" |
07630cea | 18 | #include "mkdir.h" |
3ffd4af2 | 19 | #include "path.h" |
07630cea | 20 | #include "special.h" |
8fcde012 | 21 | #include "stat-util.h" |
8b43440b | 22 | #include "string-table.h" |
07630cea LP |
23 | #include "string-util.h" |
24 | #include "unit-name.h" | |
25 | #include "unit.h" | |
01f78473 LP |
26 | |
27 | static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { | |
28 | [PATH_DEAD] = UNIT_INACTIVE, | |
29 | [PATH_WAITING] = UNIT_ACTIVE, | |
30 | [PATH_RUNNING] = UNIT_ACTIVE, | |
fdf20a31 | 31 | [PATH_FAILED] = UNIT_FAILED |
01f78473 LP |
32 | }; |
33 | ||
718db961 LP |
34 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
35 | ||
36 | int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) { | |
57020a3a | 37 | |
4b562198 MS |
38 | static const int flags_table[_PATH_TYPE_MAX] = { |
39 | [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
40 | [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB, | |
41 | [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO, | |
e9223856 | 42 | [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 |
43 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO |
44 | }; | |
45 | ||
46 | bool exists = false; | |
bc41f93e | 47 | char *slash, *oldslash = NULL; |
4b562198 | 48 | int r; |
0e456f97 | 49 | |
4b562198 | 50 | assert(s); |
718db961 LP |
51 | assert(s->unit); |
52 | assert(handler); | |
0e456f97 | 53 | |
718db961 | 54 | path_spec_unwatch(s); |
4b562198 | 55 | |
f8c16f42 ZJS |
56 | s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
57 | if (s->inotify_fd < 0) { | |
4b562198 MS |
58 | r = -errno; |
59 | goto fail; | |
60 | } | |
61 | ||
151b9b96 | 62 | r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s); |
f8c16f42 | 63 | if (r < 0) |
4b562198 | 64 | goto fail; |
4b562198 | 65 | |
7dfbe2e3 TG |
66 | (void) sd_event_source_set_description(s->event_source, "path"); |
67 | ||
858d36c1 | 68 | /* This function assumes the path was passed through path_simplify()! */ |
80127127 | 69 | assert(!strstr(s->path, "//")); |
4b562198 | 70 | |
180d6802 MS |
71 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { |
72 | char *cut = NULL; | |
4b562198 | 73 | int flags; |
bc41f93e ZJS |
74 | char tmp; |
75 | ||
76 | if (slash) { | |
180d6802 MS |
77 | cut = slash + (slash == s->path); |
78 | tmp = *cut; | |
79 | *cut = '\0'; | |
80 | ||
bc41f93e | 81 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; |
180d6802 | 82 | } else |
bc41f93e | 83 | flags = flags_table[s->type]; |
4b562198 | 84 | |
180d6802 | 85 | r = inotify_add_watch(s->inotify_fd, s->path, flags); |
bc41f93e | 86 | if (r < 0) { |
3742095b | 87 | if (IN_SET(errno, EACCES, ENOENT)) { |
180d6802 MS |
88 | if (cut) |
89 | *cut = tmp; | |
bc41f93e | 90 | break; |
180d6802 | 91 | } |
4b562198 | 92 | |
f2341e0a | 93 | r = log_warning_errno(errno, "Failed to add watch on %s: %s", s->path, errno == ENOSPC ? "too many watches" : strerror(-r)); |
180d6802 MS |
94 | if (cut) |
95 | *cut = tmp; | |
28a79bd2 | 96 | goto fail; |
bc41f93e ZJS |
97 | } else { |
98 | exists = true; | |
99 | ||
edfd706d | 100 | /* Path exists, we don't need to watch parent too closely. */ |
bc41f93e | 101 | if (oldslash) { |
180d6802 MS |
102 | char *cut2 = oldslash + (oldslash == s->path); |
103 | char tmp2 = *cut2; | |
104 | *cut2 = '\0'; | |
bc41f93e | 105 | |
edfd706d ZJS |
106 | (void) inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); |
107 | /* Error is ignored, the worst can happen is we get spurious events. */ | |
bc41f93e | 108 | |
180d6802 | 109 | *cut2 = tmp2; |
bc41f93e | 110 | } |
28a79bd2 | 111 | } |
bc41f93e | 112 | |
180d6802 MS |
113 | if (cut) |
114 | *cut = tmp; | |
115 | ||
116 | if (slash) | |
bc41f93e | 117 | oldslash = slash; |
180d6802 | 118 | else { |
bc41f93e ZJS |
119 | /* whole path has been iterated over */ |
120 | s->primary_wd = r; | |
121 | break; | |
122 | } | |
123 | } | |
124 | ||
28a79bd2 | 125 | if (!exists) { |
f2341e0a LP |
126 | r = log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", s->path); |
127 | /* either EACCESS or ENOENT */ | |
28a79bd2 ZJS |
128 | goto fail; |
129 | } | |
130 | ||
4b562198 MS |
131 | return 0; |
132 | ||
133 | fail: | |
718db961 | 134 | path_spec_unwatch(s); |
4b562198 | 135 | return r; |
0e456f97 LP |
136 | } |
137 | ||
718db961 LP |
138 | void path_spec_unwatch(PathSpec *s) { |
139 | assert(s); | |
62347bc2 | 140 | |
718db961 | 141 | s->event_source = sd_event_source_unref(s->event_source); |
03e334a1 | 142 | s->inotify_fd = safe_close(s->inotify_fd); |
62347bc2 LP |
143 | } |
144 | ||
718db961 | 145 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { |
0254e944 | 146 | union inotify_event_buffer buffer; |
4b562198 | 147 | struct inotify_event *e; |
f7c1ad4f | 148 | ssize_t l; |
4b562198 MS |
149 | int r = 0; |
150 | ||
718db961 | 151 | if (revents != EPOLLIN) { |
15f55e80 | 152 | log_error("Got invalid poll event on inotify."); |
a163db44 | 153 | return -EINVAL; |
4b562198 MS |
154 | } |
155 | ||
0254e944 | 156 | l = read(s->inotify_fd, &buffer, sizeof(buffer)); |
f7c1ad4f | 157 | if (l < 0) { |
3742095b | 158 | if (IN_SET(errno, EAGAIN, EINTR)) |
f7c1ad4f | 159 | return 0; |
4b562198 | 160 | |
4a62c710 | 161 | return log_error_errno(errno, "Failed to read inotify event: %m"); |
f7c1ad4f | 162 | } |
4b562198 | 163 | |
f7c1ad4f | 164 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
3742095b | 165 | if (IN_SET(s->type, PATH_CHANGED, PATH_MODIFIED) && |
714d943f | 166 | s->primary_wd == e->wd) |
4b562198 | 167 | r = 1; |
4b562198 | 168 | } |
a163db44 | 169 | |
4b562198 MS |
170 | return r; |
171 | } | |
172 | ||
57020a3a | 173 | static bool path_spec_check_good(PathSpec *s, bool initial) { |
4b562198 MS |
174 | bool good = false; |
175 | ||
176 | switch (s->type) { | |
177 | ||
178 | case PATH_EXISTS: | |
179 | good = access(s->path, F_OK) >= 0; | |
180 | break; | |
181 | ||
182 | case PATH_EXISTS_GLOB: | |
183 | good = glob_exists(s->path) > 0; | |
184 | break; | |
185 | ||
186 | case PATH_DIRECTORY_NOT_EMPTY: { | |
187 | int k; | |
188 | ||
189 | k = dir_is_empty(s->path); | |
190 | good = !(k == -ENOENT || k > 0); | |
191 | break; | |
192 | } | |
193 | ||
714d943f MS |
194 | case PATH_CHANGED: |
195 | case PATH_MODIFIED: { | |
4b562198 MS |
196 | bool b; |
197 | ||
198 | b = access(s->path, F_OK) >= 0; | |
199 | good = !initial && b != s->previous_exists; | |
200 | s->previous_exists = b; | |
201 | break; | |
202 | } | |
203 | ||
204 | default: | |
205 | ; | |
206 | } | |
207 | ||
208 | return good; | |
209 | } | |
210 | ||
57020a3a | 211 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
212 | int r; |
213 | ||
3742095b | 214 | if (IN_SET(s->type, PATH_EXISTS, PATH_EXISTS_GLOB)) |
4b562198 MS |
215 | return; |
216 | ||
15f55e80 ZJS |
217 | r = mkdir_p_label(s->path, mode); |
218 | if (r < 0) | |
da927ba9 | 219 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
220 | } |
221 | ||
57020a3a | 222 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
4b562198 MS |
223 | fprintf(f, |
224 | "%s%s: %s\n", | |
225 | prefix, | |
226 | path_type_to_string(s->type), | |
227 | s->path); | |
228 | } | |
229 | ||
57020a3a LP |
230 | void path_spec_done(PathSpec *s) { |
231 | assert(s); | |
4b562198 | 232 | assert(s->inotify_fd == -1); |
57020a3a | 233 | |
4b562198 MS |
234 | free(s->path); |
235 | } | |
236 | ||
237 | static void path_init(Unit *u) { | |
238 | Path *p = PATH(u); | |
239 | ||
240 | assert(u); | |
ac155bb8 | 241 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
242 | |
243 | p->directory_mode = 0755; | |
244 | } | |
245 | ||
74051b9b | 246 | void path_free_specs(Path *p) { |
01f78473 LP |
247 | PathSpec *s; |
248 | ||
249 | assert(p); | |
250 | ||
251 | while ((s = p->specs)) { | |
718db961 | 252 | path_spec_unwatch(s); |
71fda00f | 253 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 254 | path_spec_done(s); |
01f78473 LP |
255 | free(s); |
256 | } | |
257 | } | |
258 | ||
74051b9b LP |
259 | static void path_done(Unit *u) { |
260 | Path *p = PATH(u); | |
261 | ||
262 | assert(p); | |
263 | ||
74051b9b LP |
264 | path_free_specs(p); |
265 | } | |
266 | ||
eef85c4a | 267 | static int path_add_mount_dependencies(Path *p) { |
01f78473 LP |
268 | PathSpec *s; |
269 | int r; | |
270 | ||
271 | assert(p); | |
01f78473 LP |
272 | |
273 | LIST_FOREACH(spec, s, p->specs) { | |
eef85c4a | 274 | r = unit_require_mounts_for(UNIT(p), s->path, UNIT_DEPENDENCY_FILE); |
e0207c8d | 275 | if (r < 0) |
01f78473 | 276 | return r; |
e0207c8d | 277 | } |
01f78473 LP |
278 | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int path_verify(Path *p) { | |
283 | assert(p); | |
284 | ||
1124fe6f | 285 | if (UNIT(p)->load_state != UNIT_LOADED) |
01f78473 LP |
286 | return 0; |
287 | ||
288 | if (!p->specs) { | |
f2341e0a | 289 | log_unit_error(UNIT(p), "Path unit lacks path setting. Refusing."); |
6f40aa45 | 290 | return -ENOEXEC; |
01f78473 LP |
291 | } |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
6c155fe3 LP |
296 | static int path_add_default_dependencies(Path *p) { |
297 | int r; | |
298 | ||
299 | assert(p); | |
300 | ||
4c9ea260 LP |
301 | if (!UNIT(p)->default_dependencies) |
302 | return 0; | |
303 | ||
eef85c4a | 304 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_PATHS_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT); |
e3d84721 LP |
305 | if (r < 0) |
306 | return r; | |
2a77d31d | 307 | |
463d0d15 | 308 | if (MANAGER_IS_SYSTEM(UNIT(p)->manager)) { |
eef85c4a | 309 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT); |
e0207c8d | 310 | if (r < 0) |
6c155fe3 | 311 | return r; |
2a77d31d | 312 | } |
6c155fe3 | 313 | |
eef85c4a LP |
314 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT); |
315 | } | |
316 | ||
317 | static int path_add_trigger_dependencies(Path *p) { | |
318 | Unit *x; | |
319 | int r; | |
320 | ||
321 | assert(p); | |
322 | ||
323 | if (!hashmap_isempty(UNIT(p)->dependencies[UNIT_TRIGGERS])) | |
324 | return 0; | |
325 | ||
326 | r = unit_load_related_unit(UNIT(p), ".service", &x); | |
327 | if (r < 0) | |
328 | return r; | |
329 | ||
330 | return unit_add_two_dependencies(UNIT(p), UNIT_BEFORE, UNIT_TRIGGERS, x, true, UNIT_DEPENDENCY_IMPLICIT); | |
6c155fe3 LP |
331 | } |
332 | ||
01f78473 LP |
333 | static int path_load(Unit *u) { |
334 | Path *p = PATH(u); | |
335 | int r; | |
336 | ||
337 | assert(u); | |
ac155bb8 | 338 | assert(u->load_state == UNIT_STUB); |
01f78473 | 339 | |
e0207c8d ZJS |
340 | r = unit_load_fragment_and_dropin(u); |
341 | if (r < 0) | |
01f78473 LP |
342 | return r; |
343 | ||
ac155bb8 | 344 | if (u->load_state == UNIT_LOADED) { |
01f78473 | 345 | |
eef85c4a LP |
346 | r = path_add_trigger_dependencies(p); |
347 | if (r < 0) | |
348 | return r; | |
57020a3a | 349 | |
eef85c4a | 350 | r = path_add_mount_dependencies(p); |
e0207c8d | 351 | if (r < 0) |
01f78473 | 352 | return r; |
a40eb732 | 353 | |
4c9ea260 LP |
354 | r = path_add_default_dependencies(p); |
355 | if (r < 0) | |
356 | return r; | |
01f78473 LP |
357 | } |
358 | ||
359 | return path_verify(p); | |
360 | } | |
361 | ||
362 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
363 | Path *p = PATH(u); | |
3ecaa09b | 364 | Unit *trigger; |
01f78473 LP |
365 | PathSpec *s; |
366 | ||
e364ad06 LP |
367 | assert(p); |
368 | assert(f); | |
01f78473 | 369 | |
3ecaa09b LP |
370 | trigger = UNIT_TRIGGER(u); |
371 | ||
01f78473 LP |
372 | fprintf(f, |
373 | "%sPath State: %s\n" | |
cd43ca73 | 374 | "%sResult: %s\n" |
0e456f97 LP |
375 | "%sUnit: %s\n" |
376 | "%sMakeDirectory: %s\n" | |
377 | "%sDirectoryMode: %04o\n", | |
01f78473 | 378 | prefix, path_state_to_string(p->state), |
cd43ca73 | 379 | prefix, path_result_to_string(p->result), |
3ecaa09b | 380 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
381 | prefix, yes_no(p->make_directory), |
382 | prefix, p->directory_mode); | |
01f78473 LP |
383 | |
384 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 385 | path_spec_dump(s, f, prefix); |
01f78473 LP |
386 | } |
387 | ||
388 | static void path_unwatch(Path *p) { | |
389 | PathSpec *s; | |
390 | ||
391 | assert(p); | |
392 | ||
393 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 394 | path_spec_unwatch(s); |
01f78473 LP |
395 | } |
396 | ||
397 | static int path_watch(Path *p) { | |
398 | int r; | |
399 | PathSpec *s; | |
400 | ||
401 | assert(p); | |
402 | ||
e0207c8d | 403 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 404 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 405 | if (r < 0) |
01f78473 | 406 | return r; |
e0207c8d | 407 | } |
01f78473 LP |
408 | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static void path_set_state(Path *p, PathState state) { | |
413 | PathState old_state; | |
414 | assert(p); | |
415 | ||
416 | old_state = p->state; | |
417 | p->state = state; | |
418 | ||
672028dc LP |
419 | if (state != PATH_WAITING && |
420 | (state != PATH_RUNNING || p->inotify_triggered)) | |
01f78473 LP |
421 | path_unwatch(p); |
422 | ||
423 | if (state != old_state) | |
3541bf1f | 424 | log_unit_debug(UNIT(p), "Changed %s -> %s", path_state_to_string(old_state), path_state_to_string(state)); |
01f78473 | 425 | |
2ad2e41a | 426 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], 0); |
01f78473 LP |
427 | } |
428 | ||
ac3f50ca | 429 | static void path_enter_waiting(Path *p, bool initial, bool recheck); |
01f78473 | 430 | |
be847e82 | 431 | static int path_coldplug(Unit *u) { |
01f78473 LP |
432 | Path *p = PATH(u); |
433 | ||
434 | assert(p); | |
435 | assert(p->state == PATH_DEAD); | |
436 | ||
437 | if (p->deserialized_state != p->state) { | |
438 | ||
3742095b | 439 | if (IN_SET(p->deserialized_state, PATH_WAITING, PATH_RUNNING)) |
be847e82 LP |
440 | path_enter_waiting(p, true, true); |
441 | else | |
01f78473 LP |
442 | path_set_state(p, p->deserialized_state); |
443 | } | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
cd43ca73 | 448 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
449 | assert(p); |
450 | ||
a0fef983 | 451 | if (p->result == PATH_SUCCESS) |
cd43ca73 | 452 | p->result = f; |
01f78473 | 453 | |
ed77d407 LP |
454 | if (p->result != PATH_SUCCESS) |
455 | log_unit_warning(UNIT(p), "Failed with result '%s'.", path_result_to_string(p->result)); | |
456 | ||
cd43ca73 | 457 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
458 | } |
459 | ||
460 | static void path_enter_running(Path *p) { | |
4afd3348 | 461 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
e903182e | 462 | Unit *trigger; |
01f78473 | 463 | int r; |
398ef8ba | 464 | |
01f78473 | 465 | assert(p); |
3ecaa09b | 466 | |
ba3e67a7 | 467 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 468 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
469 | return; |
470 | ||
e903182e LP |
471 | trigger = UNIT_TRIGGER(UNIT(p)); |
472 | if (!trigger) { | |
473 | log_unit_error(UNIT(p), "Unit to trigger vanished."); | |
9e4942ed | 474 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
e903182e LP |
475 | return; |
476 | } | |
477 | ||
478 | r = manager_add_job(UNIT(p)->manager, JOB_START, trigger, JOB_REPLACE, &error, NULL); | |
e0207c8d | 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); | |
e903182e | 559 | Unit *trigger; |
07299350 | 560 | int r; |
01f78473 LP |
561 | |
562 | assert(p); | |
3742095b | 563 | assert(IN_SET(p->state, PATH_DEAD, PATH_FAILED)); |
01f78473 | 564 | |
e903182e LP |
565 | trigger = UNIT_TRIGGER(u); |
566 | if (!trigger || trigger->load_state != UNIT_LOADED) { | |
567 | log_unit_error(u, "Refusing to start, unit to trigger not loaded."); | |
01f78473 | 568 | return -ENOENT; |
e903182e | 569 | } |
01f78473 | 570 | |
07299350 LP |
571 | r = unit_start_limit_test(u); |
572 | if (r < 0) { | |
573 | path_enter_dead(p, PATH_FAILURE_START_LIMIT_HIT); | |
574 | return r; | |
575 | } | |
576 | ||
4b58153d LP |
577 | r = unit_acquire_invocation_id(u); |
578 | if (r < 0) | |
579 | return r; | |
580 | ||
0e456f97 LP |
581 | path_mkdir(p); |
582 | ||
cd43ca73 | 583 | p->result = PATH_SUCCESS; |
ac3f50ca | 584 | path_enter_waiting(p, true, true); |
00dc5d76 | 585 | |
82a2b6bb | 586 | return 1; |
01f78473 LP |
587 | } |
588 | ||
589 | static int path_stop(Unit *u) { | |
590 | Path *p = PATH(u); | |
591 | ||
592 | assert(p); | |
3742095b | 593 | assert(IN_SET(p->state, PATH_WAITING, PATH_RUNNING)); |
01f78473 | 594 | |
cd43ca73 | 595 | path_enter_dead(p, PATH_SUCCESS); |
82a2b6bb | 596 | return 1; |
01f78473 LP |
597 | } |
598 | ||
599 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
600 | Path *p = PATH(u); | |
601 | ||
602 | assert(u); | |
603 | assert(f); | |
604 | assert(fds); | |
605 | ||
606 | unit_serialize_item(u, f, "state", path_state_to_string(p->state)); | |
cd43ca73 | 607 | unit_serialize_item(u, f, "result", path_result_to_string(p->result)); |
01f78473 LP |
608 | |
609 | return 0; | |
610 | } | |
611 | ||
612 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
613 | Path *p = PATH(u); | |
614 | ||
615 | assert(u); | |
616 | assert(key); | |
617 | assert(value); | |
618 | assert(fds); | |
619 | ||
620 | if (streq(key, "state")) { | |
621 | PathState state; | |
622 | ||
e0207c8d ZJS |
623 | state = path_state_from_string(value); |
624 | if (state < 0) | |
f2341e0a | 625 | log_unit_debug(u, "Failed to parse state value: %s", value); |
01f78473 LP |
626 | else |
627 | p->deserialized_state = state; | |
cd43ca73 LP |
628 | |
629 | } else if (streq(key, "result")) { | |
630 | PathResult f; | |
631 | ||
632 | f = path_result_from_string(value); | |
633 | if (f < 0) | |
f2341e0a | 634 | log_unit_debug(u, "Failed to parse result value: %s", value); |
cd43ca73 LP |
635 | else if (f != PATH_SUCCESS) |
636 | p->result = f; | |
637 | ||
01f78473 | 638 | } else |
f2341e0a | 639 | log_unit_debug(u, "Unknown serialization key: %s", key); |
01f78473 LP |
640 | |
641 | return 0; | |
642 | } | |
643 | ||
44a6b1b6 | 644 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
645 | assert(u); |
646 | ||
647 | return state_translation_table[PATH(u)->state]; | |
648 | } | |
649 | ||
44a6b1b6 | 650 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
651 | assert(u); |
652 | ||
653 | return path_state_to_string(PATH(u)->state); | |
654 | } | |
655 | ||
718db961 LP |
656 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
657 | PathSpec *s = userdata; | |
658 | Path *p; | |
4b562198 | 659 | int changed; |
01f78473 | 660 | |
718db961 LP |
661 | assert(s); |
662 | assert(s->unit); | |
01f78473 LP |
663 | assert(fd >= 0); |
664 | ||
718db961 LP |
665 | p = PATH(s->unit); |
666 | ||
ec2ce0c5 | 667 | if (!IN_SET(p->state, PATH_WAITING, PATH_RUNNING)) |
718db961 | 668 | return 0; |
01f78473 | 669 | |
ac155bb8 | 670 | /* log_debug("inotify wakeup on %s.", u->id); */ |
01f78473 | 671 | |
01f78473 | 672 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 673 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
674 | break; |
675 | ||
676 | if (!s) { | |
677 | log_error("Got event on unknown fd."); | |
678 | goto fail; | |
679 | } | |
680 | ||
718db961 | 681 | changed = path_spec_fd_event(s, revents); |
4b562198 | 682 | if (changed < 0) |
01f78473 | 683 | goto fail; |
01f78473 | 684 | |
672028dc LP |
685 | /* If we are already running, then remember that one event was |
686 | * dispatched so that we restart the service only if something | |
687 | * actually changed on disk */ | |
688 | p->inotify_triggered = true; | |
689 | ||
672028dc LP |
690 | if (changed) |
691 | path_enter_running(p); | |
692 | else | |
ac3f50ca | 693 | path_enter_waiting(p, false, true); |
672028dc | 694 | |
718db961 | 695 | return 0; |
01f78473 LP |
696 | |
697 | fail: | |
cd43ca73 | 698 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 699 | return 0; |
01f78473 LP |
700 | } |
701 | ||
3ecaa09b LP |
702 | static void path_trigger_notify(Unit *u, Unit *other) { |
703 | Path *p = PATH(u); | |
01f78473 | 704 | |
3ecaa09b LP |
705 | assert(u); |
706 | assert(other); | |
01f78473 | 707 | |
3ecaa09b LP |
708 | /* Invoked whenever the unit we trigger changes state or gains |
709 | * or loses a job */ | |
01f78473 | 710 | |
3ecaa09b LP |
711 | if (other->load_state != UNIT_LOADED) |
712 | return; | |
01f78473 | 713 | |
3ecaa09b LP |
714 | if (p->state == PATH_RUNNING && |
715 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
f2341e0a | 716 | log_unit_debug(UNIT(p), "Got notified about unit deactivation."); |
672028dc | 717 | |
3ecaa09b LP |
718 | /* Hmm, so inotify was triggered since the |
719 | * last activation, so I guess we need to | |
720 | * recheck what is going on. */ | |
721 | path_enter_waiting(p, false, p->inotify_triggered); | |
01f78473 | 722 | } |
01f78473 LP |
723 | } |
724 | ||
fdf20a31 | 725 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
726 | Path *p = PATH(u); |
727 | ||
728 | assert(p); | |
729 | ||
fdf20a31 | 730 | if (p->state == PATH_FAILED) |
5632e374 LP |
731 | path_set_state(p, PATH_DEAD); |
732 | ||
cd43ca73 | 733 | p->result = PATH_SUCCESS; |
5632e374 LP |
734 | } |
735 | ||
01f78473 LP |
736 | static const char* const path_type_table[_PATH_TYPE_MAX] = { |
737 | [PATH_EXISTS] = "PathExists", | |
8092a428 | 738 | [PATH_EXISTS_GLOB] = "PathExistsGlob", |
2c5859af | 739 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
01f78473 | 740 | [PATH_CHANGED] = "PathChanged", |
e9223856 | 741 | [PATH_MODIFIED] = "PathModified", |
01f78473 LP |
742 | }; |
743 | ||
744 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
745 | ||
cd43ca73 LP |
746 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
747 | [PATH_SUCCESS] = "success", | |
2c5859af | 748 | [PATH_FAILURE_RESOURCES] = "resources", |
07299350 | 749 | [PATH_FAILURE_START_LIMIT_HIT] = "start-limit-hit", |
cd43ca73 LP |
750 | }; |
751 | ||
752 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
753 | ||
01f78473 | 754 | const UnitVTable path_vtable = { |
7d17cfbc | 755 | .object_size = sizeof(Path), |
718db961 | 756 | |
f975e971 LP |
757 | .sections = |
758 | "Unit\0" | |
759 | "Path\0" | |
760 | "Install\0", | |
5b9fbf89 YW |
761 | .private_section = "Path", |
762 | ||
763 | .can_transient = true, | |
01f78473 | 764 | |
0e456f97 | 765 | .init = path_init, |
01f78473 LP |
766 | .done = path_done, |
767 | .load = path_load, | |
768 | ||
769 | .coldplug = path_coldplug, | |
770 | ||
771 | .dump = path_dump, | |
772 | ||
773 | .start = path_start, | |
774 | .stop = path_stop, | |
775 | ||
776 | .serialize = path_serialize, | |
777 | .deserialize_item = path_deserialize_item, | |
778 | ||
779 | .active_state = path_active_state, | |
780 | .sub_state_to_string = path_sub_state_to_string, | |
781 | ||
3ecaa09b LP |
782 | .trigger_notify = path_trigger_notify, |
783 | ||
fdf20a31 | 784 | .reset_failed = path_reset_failed, |
5632e374 | 785 | |
5b9fbf89 YW |
786 | .bus_vtable = bus_path_vtable, |
787 | .bus_set_property = bus_path_set_property, | |
01f78473 | 788 | }; |