]>
Commit | Line | Data |
---|---|---|
db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
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" |
7a16cd4b | 12 | #include "escape.h" |
3ffd4af2 | 13 | #include "fd-util.h" |
7d50b32a | 14 | #include "glob-util.h" |
9e5fd717 | 15 | #include "inotify-util.h" |
f8c16f42 | 16 | #include "macro.h" |
35cd0ba5 | 17 | #include "mkdir-label.h" |
3ffd4af2 | 18 | #include "path.h" |
7a16cd4b | 19 | #include "path-util.h" |
d68c645b | 20 | #include "serialize.h" |
07630cea | 21 | #include "special.h" |
8fcde012 | 22 | #include "stat-util.h" |
8b43440b | 23 | #include "string-table.h" |
07630cea LP |
24 | #include "string-util.h" |
25 | #include "unit-name.h" | |
26 | #include "unit.h" | |
01f78473 LP |
27 | |
28 | static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { | |
29 | [PATH_DEAD] = UNIT_INACTIVE, | |
30 | [PATH_WAITING] = UNIT_ACTIVE, | |
31 | [PATH_RUNNING] = UNIT_ACTIVE, | |
7a16cd4b | 32 | [PATH_FAILED] = UNIT_FAILED, |
01f78473 LP |
33 | }; |
34 | ||
718db961 LP |
35 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
36 | ||
37 | int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) { | |
4b562198 | 38 | static const int flags_table[_PATH_TYPE_MAX] = { |
44ff2a5e LP |
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, | |
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, | |
7a16cd4b | 43 | [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO, |
4b562198 MS |
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) { | |
795125cd | 58 | r = log_error_errno(errno, "Failed to allocate inotify fd: %m"); |
4b562198 MS |
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); |
795125cd LP |
63 | if (r < 0) { |
64 | log_error_errno(r, "Failed to add inotify fd to event loop: %m"); | |
4b562198 | 65 | goto fail; |
795125cd | 66 | } |
4b562198 | 67 | |
7dfbe2e3 TG |
68 | (void) sd_event_source_set_description(s->event_source, "path"); |
69 | ||
858d36c1 | 70 | /* This function assumes the path was passed through path_simplify()! */ |
80127127 | 71 | assert(!strstr(s->path, "//")); |
4b562198 | 72 | |
180d6802 | 73 | for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) { |
41cdcb54 LP |
74 | bool incomplete = false; |
75 | int flags, wd = -1; | |
76 | char tmp, *cut; | |
bc41f93e ZJS |
77 | |
78 | if (slash) { | |
180d6802 MS |
79 | cut = slash + (slash == s->path); |
80 | tmp = *cut; | |
81 | *cut = '\0'; | |
82 | ||
bc41f93e | 83 | flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; |
41cdcb54 LP |
84 | } else { |
85 | cut = NULL; | |
bc41f93e | 86 | flags = flags_table[s->type]; |
41cdcb54 | 87 | } |
4b562198 | 88 | |
41cdcb54 LP |
89 | /* If this is a symlink watch both the symlink inode and where it points to. If the inode is |
90 | * not a symlink both calls will install the same watch, which is redundant and doesn't | |
91 | * hurt. */ | |
92 | for (int follow_symlink = 0; follow_symlink < 2; follow_symlink ++) { | |
93 | uint32_t f = flags; | |
94 | ||
95 | SET_FLAG(f, IN_DONT_FOLLOW, !follow_symlink); | |
96 | ||
97 | wd = inotify_add_watch(s->inotify_fd, s->path, f); | |
98 | if (wd < 0) { | |
99 | if (IN_SET(errno, EACCES, ENOENT)) { | |
100 | incomplete = true; /* This is an expected error, let's accept this | |
101 | * quietly: we have an incomplete watch for | |
102 | * now. */ | |
103 | break; | |
104 | } | |
105 | ||
106 | /* This second call to inotify_add_watch() should fail like the previous one | |
107 | * and is done for logging the error in a comprehensive way. */ | |
108 | wd = inotify_add_watch_and_warn(s->inotify_fd, s->path, f); | |
109 | if (wd < 0) { | |
110 | if (cut) | |
111 | *cut = tmp; | |
112 | ||
113 | r = wd; | |
114 | goto fail; | |
115 | } | |
116 | ||
117 | /* Hmm, we succeeded in adding the watch this time... let's continue. */ | |
180d6802 | 118 | } |
41cdcb54 | 119 | } |
4b562198 | 120 | |
41cdcb54 LP |
121 | if (incomplete) { |
122 | if (cut) | |
123 | *cut = tmp; | |
27c3112d | 124 | |
41cdcb54 | 125 | break; |
27c3112d | 126 | } |
41cdcb54 | 127 | |
27c3112d FB |
128 | exists = true; |
129 | ||
130 | /* Path exists, we don't need to watch parent too closely. */ | |
131 | if (oldslash) { | |
132 | char *cut2 = oldslash + (oldslash == s->path); | |
133 | char tmp2 = *cut2; | |
134 | *cut2 = '\0'; | |
135 | ||
136 | (void) inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF); | |
137 | /* Error is ignored, the worst can happen is we get spurious events. */ | |
138 | ||
139 | *cut2 = tmp2; | |
28a79bd2 | 140 | } |
bc41f93e | 141 | |
180d6802 MS |
142 | if (cut) |
143 | *cut = tmp; | |
144 | ||
145 | if (slash) | |
bc41f93e | 146 | oldslash = slash; |
180d6802 | 147 | else { |
bc41f93e | 148 | /* whole path has been iterated over */ |
41cdcb54 | 149 | s->primary_wd = wd; |
bc41f93e ZJS |
150 | break; |
151 | } | |
152 | } | |
153 | ||
28a79bd2 | 154 | if (!exists) { |
f2341e0a LP |
155 | r = log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", s->path); |
156 | /* either EACCESS or ENOENT */ | |
28a79bd2 ZJS |
157 | goto fail; |
158 | } | |
159 | ||
4b562198 MS |
160 | return 0; |
161 | ||
162 | fail: | |
718db961 | 163 | path_spec_unwatch(s); |
4b562198 | 164 | return r; |
0e456f97 LP |
165 | } |
166 | ||
718db961 LP |
167 | void path_spec_unwatch(PathSpec *s) { |
168 | assert(s); | |
62347bc2 | 169 | |
5dcadb4c | 170 | s->event_source = sd_event_source_disable_unref(s->event_source); |
03e334a1 | 171 | s->inotify_fd = safe_close(s->inotify_fd); |
62347bc2 LP |
172 | } |
173 | ||
718db961 | 174 | int path_spec_fd_event(PathSpec *s, uint32_t revents) { |
0254e944 | 175 | union inotify_event_buffer buffer; |
4b562198 | 176 | struct inotify_event *e; |
f7c1ad4f | 177 | ssize_t l; |
d6d00b65 LP |
178 | |
179 | assert(s); | |
4b562198 | 180 | |
baaa35ad ZJS |
181 | if (revents != EPOLLIN) |
182 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
183 | "Got invalid poll event on inotify."); | |
4b562198 | 184 | |
0254e944 | 185 | l = read(s->inotify_fd, &buffer, sizeof(buffer)); |
f7c1ad4f | 186 | if (l < 0) { |
8add30a0 | 187 | if (ERRNO_IS_TRANSIENT(errno)) |
f7c1ad4f | 188 | return 0; |
4b562198 | 189 | |
4a62c710 | 190 | return log_error_errno(errno, "Failed to read inotify event: %m"); |
f7c1ad4f | 191 | } |
4b562198 | 192 | |
d6d00b65 LP |
193 | if (IN_SET(s->type, PATH_CHANGED, PATH_MODIFIED)) |
194 | FOREACH_INOTIFY_EVENT(e, buffer, l) | |
195 | if (s->primary_wd == e->wd) | |
196 | return 1; | |
a163db44 | 197 | |
d6d00b65 | 198 | return 0; |
4b562198 MS |
199 | } |
200 | ||
708961c7 | 201 | static bool path_spec_check_good(PathSpec *s, bool initial, bool from_trigger_notify) { |
d7cf8c24 | 202 | bool b, good = false; |
4b562198 MS |
203 | |
204 | switch (s->type) { | |
205 | ||
206 | case PATH_EXISTS: | |
708961c7 | 207 | good = access(s->path, F_OK) >= 0; |
4b562198 MS |
208 | break; |
209 | ||
210 | case PATH_EXISTS_GLOB: | |
211 | good = glob_exists(s->path) > 0; | |
212 | break; | |
213 | ||
214 | case PATH_DIRECTORY_NOT_EMPTY: { | |
215 | int k; | |
216 | ||
217 | k = dir_is_empty(s->path); | |
5896a9eb | 218 | good = !(IN_SET(k, -ENOENT, -ENOTDIR) || k > 0); |
4b562198 MS |
219 | break; |
220 | } | |
221 | ||
714d943f | 222 | case PATH_CHANGED: |
d7cf8c24 | 223 | case PATH_MODIFIED: |
4b562198 | 224 | b = access(s->path, F_OK) >= 0; |
708961c7 | 225 | good = !initial && !from_trigger_notify && b != s->previous_exists; |
4b562198 MS |
226 | s->previous_exists = b; |
227 | break; | |
4b562198 MS |
228 | |
229 | default: | |
230 | ; | |
231 | } | |
232 | ||
233 | return good; | |
234 | } | |
235 | ||
57020a3a | 236 | static void path_spec_mkdir(PathSpec *s, mode_t mode) { |
4b562198 MS |
237 | int r; |
238 | ||
3742095b | 239 | if (IN_SET(s->type, PATH_EXISTS, PATH_EXISTS_GLOB)) |
4b562198 MS |
240 | return; |
241 | ||
15f55e80 ZJS |
242 | r = mkdir_p_label(s->path, mode); |
243 | if (r < 0) | |
da927ba9 | 244 | log_warning_errno(r, "mkdir(%s) failed: %m", s->path); |
4b562198 MS |
245 | } |
246 | ||
57020a3a | 247 | static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) { |
23450c89 ZJS |
248 | const char *type; |
249 | ||
250 | assert_se(type = path_type_to_string(s->type)); | |
251 | fprintf(f, "%s%s: %s\n", prefix, type, s->path); | |
4b562198 MS |
252 | } |
253 | ||
57020a3a LP |
254 | void path_spec_done(PathSpec *s) { |
255 | assert(s); | |
4b562198 | 256 | assert(s->inotify_fd == -1); |
57020a3a | 257 | |
4b562198 MS |
258 | free(s->path); |
259 | } | |
260 | ||
261 | static void path_init(Unit *u) { | |
262 | Path *p = PATH(u); | |
263 | ||
264 | assert(u); | |
ac155bb8 | 265 | assert(u->load_state == UNIT_STUB); |
4b562198 MS |
266 | |
267 | p->directory_mode = 0755; | |
268 | } | |
269 | ||
74051b9b | 270 | void path_free_specs(Path *p) { |
01f78473 LP |
271 | PathSpec *s; |
272 | ||
273 | assert(p); | |
274 | ||
275 | while ((s = p->specs)) { | |
718db961 | 276 | path_spec_unwatch(s); |
71fda00f | 277 | LIST_REMOVE(spec, p->specs, s); |
57020a3a | 278 | path_spec_done(s); |
01f78473 LP |
279 | free(s); |
280 | } | |
281 | } | |
282 | ||
74051b9b LP |
283 | static void path_done(Unit *u) { |
284 | Path *p = PATH(u); | |
285 | ||
286 | assert(p); | |
287 | ||
74051b9b LP |
288 | path_free_specs(p); |
289 | } | |
290 | ||
eef85c4a | 291 | static int path_add_mount_dependencies(Path *p) { |
01f78473 LP |
292 | PathSpec *s; |
293 | int r; | |
294 | ||
295 | assert(p); | |
01f78473 LP |
296 | |
297 | LIST_FOREACH(spec, s, p->specs) { | |
eef85c4a | 298 | r = unit_require_mounts_for(UNIT(p), s->path, UNIT_DEPENDENCY_FILE); |
e0207c8d | 299 | if (r < 0) |
01f78473 | 300 | return r; |
e0207c8d | 301 | } |
01f78473 LP |
302 | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static int path_verify(Path *p) { | |
307 | assert(p); | |
75193d41 | 308 | assert(UNIT(p)->load_state == UNIT_LOADED); |
01f78473 | 309 | |
d85ff944 YW |
310 | if (!p->specs) |
311 | return log_unit_error_errno(UNIT(p), SYNTHETIC_ERRNO(ENOEXEC), "Path unit lacks path setting. Refusing."); | |
01f78473 LP |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
6c155fe3 LP |
316 | static int path_add_default_dependencies(Path *p) { |
317 | int r; | |
318 | ||
319 | assert(p); | |
320 | ||
4c9ea260 LP |
321 | if (!UNIT(p)->default_dependencies) |
322 | return 0; | |
323 | ||
35d8c19a | 324 | r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_PATHS_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
e3d84721 LP |
325 | if (r < 0) |
326 | return r; | |
2a77d31d | 327 | |
463d0d15 | 328 | if (MANAGER_IS_SYSTEM(UNIT(p)->manager)) { |
5a724170 | 329 | r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
e0207c8d | 330 | if (r < 0) |
6c155fe3 | 331 | return r; |
2a77d31d | 332 | } |
6c155fe3 | 333 | |
5a724170 | 334 | return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
eef85c4a LP |
335 | } |
336 | ||
337 | static int path_add_trigger_dependencies(Path *p) { | |
338 | Unit *x; | |
339 | int r; | |
340 | ||
341 | assert(p); | |
342 | ||
bc32241e | 343 | if (UNIT_TRIGGER(UNIT(p))) |
eef85c4a LP |
344 | return 0; |
345 | ||
346 | r = unit_load_related_unit(UNIT(p), ".service", &x); | |
347 | if (r < 0) | |
348 | return r; | |
349 | ||
350 | return unit_add_two_dependencies(UNIT(p), UNIT_BEFORE, UNIT_TRIGGERS, x, true, UNIT_DEPENDENCY_IMPLICIT); | |
6c155fe3 LP |
351 | } |
352 | ||
75193d41 ZJS |
353 | static int path_add_extras(Path *p) { |
354 | int r; | |
355 | ||
356 | r = path_add_trigger_dependencies(p); | |
357 | if (r < 0) | |
358 | return r; | |
359 | ||
360 | r = path_add_mount_dependencies(p); | |
361 | if (r < 0) | |
362 | return r; | |
363 | ||
364 | return path_add_default_dependencies(p); | |
365 | } | |
366 | ||
01f78473 LP |
367 | static int path_load(Unit *u) { |
368 | Path *p = PATH(u); | |
369 | int r; | |
370 | ||
371 | assert(u); | |
ac155bb8 | 372 | assert(u->load_state == UNIT_STUB); |
01f78473 | 373 | |
c3620770 | 374 | r = unit_load_fragment_and_dropin(u, true); |
e0207c8d | 375 | if (r < 0) |
01f78473 LP |
376 | return r; |
377 | ||
75193d41 ZJS |
378 | if (u->load_state != UNIT_LOADED) |
379 | return 0; | |
a40eb732 | 380 | |
75193d41 ZJS |
381 | r = path_add_extras(p); |
382 | if (r < 0) | |
383 | return r; | |
01f78473 LP |
384 | |
385 | return path_verify(p); | |
386 | } | |
387 | ||
388 | static void path_dump(Unit *u, FILE *f, const char *prefix) { | |
389 | Path *p = PATH(u); | |
3ecaa09b | 390 | Unit *trigger; |
01f78473 LP |
391 | PathSpec *s; |
392 | ||
e364ad06 LP |
393 | assert(p); |
394 | assert(f); | |
01f78473 | 395 | |
3ecaa09b LP |
396 | trigger = UNIT_TRIGGER(u); |
397 | ||
01f78473 LP |
398 | fprintf(f, |
399 | "%sPath State: %s\n" | |
cd43ca73 | 400 | "%sResult: %s\n" |
0e456f97 LP |
401 | "%sUnit: %s\n" |
402 | "%sMakeDirectory: %s\n" | |
403 | "%sDirectoryMode: %04o\n", | |
01f78473 | 404 | prefix, path_state_to_string(p->state), |
cd43ca73 | 405 | prefix, path_result_to_string(p->result), |
3ecaa09b | 406 | prefix, trigger ? trigger->id : "n/a", |
0e456f97 LP |
407 | prefix, yes_no(p->make_directory), |
408 | prefix, p->directory_mode); | |
01f78473 LP |
409 | |
410 | LIST_FOREACH(spec, s, p->specs) | |
57020a3a | 411 | path_spec_dump(s, f, prefix); |
01f78473 LP |
412 | } |
413 | ||
414 | static void path_unwatch(Path *p) { | |
415 | PathSpec *s; | |
416 | ||
417 | assert(p); | |
418 | ||
419 | LIST_FOREACH(spec, s, p->specs) | |
718db961 | 420 | path_spec_unwatch(s); |
01f78473 LP |
421 | } |
422 | ||
423 | static int path_watch(Path *p) { | |
424 | int r; | |
425 | PathSpec *s; | |
426 | ||
427 | assert(p); | |
428 | ||
e0207c8d | 429 | LIST_FOREACH(spec, s, p->specs) { |
718db961 | 430 | r = path_spec_watch(s, path_dispatch_io); |
e0207c8d | 431 | if (r < 0) |
01f78473 | 432 | return r; |
e0207c8d | 433 | } |
01f78473 LP |
434 | |
435 | return 0; | |
436 | } | |
437 | ||
438 | static void path_set_state(Path *p, PathState state) { | |
439 | PathState old_state; | |
440 | assert(p); | |
441 | ||
6fcbec6f LP |
442 | if (p->state != state) |
443 | bus_unit_send_pending_change_signal(UNIT(p), false); | |
444 | ||
01f78473 LP |
445 | old_state = p->state; |
446 | p->state = state; | |
447 | ||
708961c7 | 448 | if (!IN_SET(state, PATH_WAITING, PATH_RUNNING)) |
01f78473 LP |
449 | path_unwatch(p); |
450 | ||
451 | if (state != old_state) | |
3541bf1f | 452 | log_unit_debug(UNIT(p), "Changed %s -> %s", path_state_to_string(old_state), path_state_to_string(state)); |
01f78473 | 453 | |
2ad2e41a | 454 | unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], 0); |
01f78473 LP |
455 | } |
456 | ||
708961c7 | 457 | static void path_enter_waiting(Path *p, bool initial, bool from_trigger_notify); |
01f78473 | 458 | |
be847e82 | 459 | static int path_coldplug(Unit *u) { |
01f78473 LP |
460 | Path *p = PATH(u); |
461 | ||
462 | assert(p); | |
463 | assert(p->state == PATH_DEAD); | |
464 | ||
465 | if (p->deserialized_state != p->state) { | |
466 | ||
3742095b | 467 | if (IN_SET(p->deserialized_state, PATH_WAITING, PATH_RUNNING)) |
708961c7 | 468 | path_enter_waiting(p, true, false); |
be847e82 | 469 | else |
01f78473 LP |
470 | path_set_state(p, p->deserialized_state); |
471 | } | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
cd43ca73 | 476 | static void path_enter_dead(Path *p, PathResult f) { |
01f78473 LP |
477 | assert(p); |
478 | ||
a0fef983 | 479 | if (p->result == PATH_SUCCESS) |
cd43ca73 | 480 | p->result = f; |
01f78473 | 481 | |
aac99f30 | 482 | unit_log_result(UNIT(p), p->result == PATH_SUCCESS, path_result_to_string(p->result)); |
40f41f34 | 483 | path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD); |
01f78473 LP |
484 | } |
485 | ||
486 | static void path_enter_running(Path *p) { | |
4afd3348 | 487 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
e903182e | 488 | Unit *trigger; |
01f78473 | 489 | int r; |
398ef8ba | 490 | |
01f78473 | 491 | assert(p); |
3ecaa09b | 492 | |
ba3e67a7 | 493 | /* Don't start job if we are supposed to go down */ |
31afa0a4 | 494 | if (unit_stop_pending(UNIT(p))) |
ba3e67a7 LP |
495 | return; |
496 | ||
e903182e LP |
497 | trigger = UNIT_TRIGGER(UNIT(p)); |
498 | if (!trigger) { | |
499 | log_unit_error(UNIT(p), "Unit to trigger vanished."); | |
9e4942ed | 500 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
e903182e LP |
501 | return; |
502 | } | |
503 | ||
50cbaba4 | 504 | r = manager_add_job(UNIT(p)->manager, JOB_START, trigger, JOB_REPLACE, NULL, &error, NULL); |
e0207c8d | 505 | if (r < 0) |
01f78473 LP |
506 | goto fail; |
507 | ||
508 | path_set_state(p, PATH_RUNNING); | |
8fca6944 MS |
509 | path_unwatch(p); |
510 | ||
01f78473 LP |
511 | return; |
512 | ||
513 | fail: | |
f2341e0a | 514 | log_unit_warning(UNIT(p), "Failed to queue unit startup job: %s", bus_error_message(&error, r)); |
cd43ca73 | 515 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
516 | } |
517 | ||
708961c7 | 518 | static bool path_check_good(Path *p, bool initial, bool from_trigger_notify) { |
01f78473 | 519 | PathSpec *s; |
01f78473 | 520 | |
ac3f50ca | 521 | assert(p); |
672028dc | 522 | |
93e63b2a | 523 | LIST_FOREACH(spec, s, p->specs) |
708961c7 | 524 | if (path_spec_check_good(s, initial, from_trigger_notify)) |
93e63b2a | 525 | return true; |
01f78473 | 526 | |
93e63b2a | 527 | return false; |
ac3f50ca | 528 | } |
01f78473 | 529 | |
708961c7 MC |
530 | static void path_enter_waiting(Path *p, bool initial, bool from_trigger_notify) { |
531 | Unit *trigger; | |
ac3f50ca | 532 | int r; |
0595f9a1 | 533 | |
708961c7 MC |
534 | /* If the triggered unit is already running, so are we */ |
535 | trigger = UNIT_TRIGGER(UNIT(p)); | |
536 | if (trigger && !UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(trigger))) { | |
537 | path_set_state(p, PATH_RUNNING); | |
538 | path_unwatch(p); | |
539 | return; | |
540 | } | |
541 | ||
542 | if (path_check_good(p, initial, from_trigger_notify)) { | |
543 | log_unit_debug(UNIT(p), "Got triggered."); | |
544 | path_enter_running(p); | |
545 | return; | |
546 | } | |
ac3f50ca | 547 | |
e0207c8d ZJS |
548 | r = path_watch(p); |
549 | if (r < 0) | |
ac3f50ca LP |
550 | goto fail; |
551 | ||
552 | /* Hmm, so now we have created inotify watches, but the file | |
553 | * might have appeared/been removed by now, so we must | |
554 | * recheck */ | |
555 | ||
708961c7 MC |
556 | if (path_check_good(p, false, from_trigger_notify)) { |
557 | log_unit_debug(UNIT(p), "Got triggered."); | |
558 | path_enter_running(p); | |
559 | return; | |
560 | } | |
01f78473 LP |
561 | |
562 | path_set_state(p, PATH_WAITING); | |
563 | return; | |
564 | ||
565 | fail: | |
f2341e0a | 566 | log_unit_warning_errno(UNIT(p), r, "Failed to enter waiting state: %m"); |
cd43ca73 | 567 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
01f78473 LP |
568 | } |
569 | ||
0e456f97 LP |
570 | static void path_mkdir(Path *p) { |
571 | PathSpec *s; | |
572 | ||
573 | assert(p); | |
574 | ||
575 | if (!p->make_directory) | |
576 | return; | |
577 | ||
4b562198 | 578 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 579 | path_spec_mkdir(s, p->directory_mode); |
0e456f97 LP |
580 | } |
581 | ||
01f78473 LP |
582 | static int path_start(Unit *u) { |
583 | Path *p = PATH(u); | |
07299350 | 584 | int r; |
01f78473 LP |
585 | |
586 | assert(p); | |
3742095b | 587 | assert(IN_SET(p->state, PATH_DEAD, PATH_FAILED)); |
01f78473 | 588 | |
a4191c9f LP |
589 | r = unit_test_trigger_loaded(u); |
590 | if (r < 0) | |
591 | return r; | |
01f78473 | 592 | |
4b58153d LP |
593 | r = unit_acquire_invocation_id(u); |
594 | if (r < 0) | |
595 | return r; | |
596 | ||
0e456f97 LP |
597 | path_mkdir(p); |
598 | ||
cd43ca73 | 599 | p->result = PATH_SUCCESS; |
708961c7 | 600 | path_enter_waiting(p, true, false); |
00dc5d76 | 601 | |
82a2b6bb | 602 | return 1; |
01f78473 LP |
603 | } |
604 | ||
605 | static int path_stop(Unit *u) { | |
606 | Path *p = PATH(u); | |
607 | ||
608 | assert(p); | |
3742095b | 609 | assert(IN_SET(p->state, PATH_WAITING, PATH_RUNNING)); |
01f78473 | 610 | |
cd43ca73 | 611 | path_enter_dead(p, PATH_SUCCESS); |
82a2b6bb | 612 | return 1; |
01f78473 LP |
613 | } |
614 | ||
615 | static int path_serialize(Unit *u, FILE *f, FDSet *fds) { | |
616 | Path *p = PATH(u); | |
7a16cd4b | 617 | PathSpec *s; |
01f78473 LP |
618 | |
619 | assert(u); | |
620 | assert(f); | |
621 | assert(fds); | |
622 | ||
d68c645b LP |
623 | (void) serialize_item(f, "state", path_state_to_string(p->state)); |
624 | (void) serialize_item(f, "result", path_result_to_string(p->result)); | |
01f78473 | 625 | |
7a16cd4b | 626 | LIST_FOREACH(spec, s, p->specs) { |
23450c89 | 627 | const char *type; |
7a16cd4b ZJS |
628 | _cleanup_free_ char *escaped = NULL; |
629 | ||
630 | escaped = cescape(s->path); | |
631 | if (!escaped) | |
632 | return log_oom(); | |
633 | ||
23450c89 | 634 | assert_se(type = path_type_to_string(s->type)); |
7a16cd4b | 635 | (void) serialize_item_format(f, "path-spec", "%s %i %s", |
23450c89 | 636 | type, |
7a16cd4b | 637 | s->previous_exists, |
f285f077 | 638 | escaped); |
7a16cd4b ZJS |
639 | } |
640 | ||
01f78473 LP |
641 | return 0; |
642 | } | |
643 | ||
644 | static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
645 | Path *p = PATH(u); | |
646 | ||
647 | assert(u); | |
648 | assert(key); | |
649 | assert(value); | |
650 | assert(fds); | |
651 | ||
652 | if (streq(key, "state")) { | |
653 | PathState state; | |
654 | ||
e0207c8d ZJS |
655 | state = path_state_from_string(value); |
656 | if (state < 0) | |
f2341e0a | 657 | log_unit_debug(u, "Failed to parse state value: %s", value); |
01f78473 LP |
658 | else |
659 | p->deserialized_state = state; | |
cd43ca73 LP |
660 | |
661 | } else if (streq(key, "result")) { | |
662 | PathResult f; | |
663 | ||
664 | f = path_result_from_string(value); | |
665 | if (f < 0) | |
f2341e0a | 666 | log_unit_debug(u, "Failed to parse result value: %s", value); |
cd43ca73 LP |
667 | else if (f != PATH_SUCCESS) |
668 | p->result = f; | |
669 | ||
7a16cd4b | 670 | } else if (streq(key, "path-spec")) { |
e437538f | 671 | int previous_exists, skip = 0; |
7a16cd4b ZJS |
672 | _cleanup_free_ char *type_str = NULL; |
673 | ||
674 | if (sscanf(value, "%ms %i %n", &type_str, &previous_exists, &skip) < 2) | |
675 | log_unit_debug(u, "Failed to parse path-spec value: %s", value); | |
676 | else { | |
677 | _cleanup_free_ char *unescaped = NULL; | |
e437538f | 678 | ssize_t l; |
7a16cd4b ZJS |
679 | PathType type; |
680 | PathSpec *s; | |
681 | ||
682 | type = path_type_from_string(type_str); | |
683 | if (type < 0) { | |
684 | log_unit_warning(u, "Unknown path type \"%s\", ignoring.", type_str); | |
685 | return 0; | |
686 | } | |
687 | ||
e437538f ZJS |
688 | l = cunescape(value+skip, 0, &unescaped); |
689 | if (l < 0) { | |
690 | log_unit_warning_errno(u, l, "Failed to unescape serialize path: %m"); | |
7a16cd4b ZJS |
691 | return 0; |
692 | } | |
693 | ||
694 | LIST_FOREACH(spec, s, p->specs) | |
695 | if (s->type == type && | |
696 | path_equal(s->path, unescaped)) { | |
697 | ||
698 | s->previous_exists = previous_exists; | |
699 | break; | |
700 | } | |
701 | } | |
702 | ||
01f78473 | 703 | } else |
f2341e0a | 704 | log_unit_debug(u, "Unknown serialization key: %s", key); |
01f78473 LP |
705 | |
706 | return 0; | |
707 | } | |
708 | ||
44a6b1b6 | 709 | _pure_ static UnitActiveState path_active_state(Unit *u) { |
01f78473 LP |
710 | assert(u); |
711 | ||
712 | return state_translation_table[PATH(u)->state]; | |
713 | } | |
714 | ||
44a6b1b6 | 715 | _pure_ static const char *path_sub_state_to_string(Unit *u) { |
01f78473 LP |
716 | assert(u); |
717 | ||
718 | return path_state_to_string(PATH(u)->state); | |
719 | } | |
720 | ||
718db961 LP |
721 | static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
722 | PathSpec *s = userdata; | |
723 | Path *p; | |
4b562198 | 724 | int changed; |
01f78473 | 725 | |
718db961 LP |
726 | assert(s); |
727 | assert(s->unit); | |
01f78473 LP |
728 | assert(fd >= 0); |
729 | ||
718db961 LP |
730 | p = PATH(s->unit); |
731 | ||
ec2ce0c5 | 732 | if (!IN_SET(p->state, PATH_WAITING, PATH_RUNNING)) |
718db961 | 733 | return 0; |
01f78473 | 734 | |
7a16cd4b | 735 | /* log_debug("inotify wakeup on %s.", UNIT(p)->id); */ |
01f78473 | 736 | |
01f78473 | 737 | LIST_FOREACH(spec, s, p->specs) |
57020a3a | 738 | if (path_spec_owns_inotify_fd(s, fd)) |
01f78473 LP |
739 | break; |
740 | ||
741 | if (!s) { | |
742 | log_error("Got event on unknown fd."); | |
743 | goto fail; | |
744 | } | |
745 | ||
718db961 | 746 | changed = path_spec_fd_event(s, revents); |
4b562198 | 747 | if (changed < 0) |
01f78473 | 748 | goto fail; |
01f78473 | 749 | |
672028dc LP |
750 | if (changed) |
751 | path_enter_running(p); | |
752 | else | |
708961c7 | 753 | path_enter_waiting(p, false, false); |
672028dc | 754 | |
718db961 | 755 | return 0; |
01f78473 LP |
756 | |
757 | fail: | |
cd43ca73 | 758 | path_enter_dead(p, PATH_FAILURE_RESOURCES); |
718db961 | 759 | return 0; |
01f78473 LP |
760 | } |
761 | ||
3ecaa09b LP |
762 | static void path_trigger_notify(Unit *u, Unit *other) { |
763 | Path *p = PATH(u); | |
01f78473 | 764 | |
3ecaa09b LP |
765 | assert(u); |
766 | assert(other); | |
01f78473 | 767 | |
0377cd29 | 768 | /* Invoked whenever the unit we trigger changes state or gains or loses a job */ |
01f78473 | 769 | |
0377cd29 LP |
770 | /* Filter out invocations with bogus state */ |
771 | assert(UNIT_IS_LOAD_COMPLETE(other->load_state)); | |
01f78473 | 772 | |
47ab8f73 LP |
773 | /* Don't propagate state changes from the triggered unit if we are already down */ |
774 | if (!IN_SET(p->state, PATH_WAITING, PATH_RUNNING)) | |
775 | return; | |
776 | ||
777 | /* Propagate start limit hit state */ | |
778 | if (other->start_limit_hit) { | |
779 | path_enter_dead(p, PATH_FAILURE_UNIT_START_LIMIT_HIT); | |
780 | return; | |
781 | } | |
782 | ||
783 | /* Don't propagate anything if there's still a job queued */ | |
784 | if (other->job) | |
785 | return; | |
786 | ||
3ecaa09b LP |
787 | if (p->state == PATH_RUNNING && |
788 | UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
f2341e0a | 789 | log_unit_debug(UNIT(p), "Got notified about unit deactivation."); |
708961c7 MC |
790 | path_enter_waiting(p, false, true); |
791 | } else if (p->state == PATH_WAITING && | |
792 | !UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) { | |
793 | log_unit_debug(UNIT(p), "Got notified about unit activation."); | |
794 | path_enter_waiting(p, false, true); | |
01f78473 | 795 | } |
01f78473 LP |
796 | } |
797 | ||
fdf20a31 | 798 | static void path_reset_failed(Unit *u) { |
5632e374 LP |
799 | Path *p = PATH(u); |
800 | ||
801 | assert(p); | |
802 | ||
fdf20a31 | 803 | if (p->state == PATH_FAILED) |
5632e374 LP |
804 | path_set_state(p, PATH_DEAD); |
805 | ||
cd43ca73 | 806 | p->result = PATH_SUCCESS; |
5632e374 LP |
807 | } |
808 | ||
705578c3 | 809 | static int path_can_start(Unit *u) { |
9727f242 DDM |
810 | Path *p = PATH(u); |
811 | int r; | |
812 | ||
813 | assert(p); | |
814 | ||
815 | r = unit_test_start_limit(u); | |
816 | if (r < 0) { | |
817 | path_enter_dead(p, PATH_FAILURE_START_LIMIT_HIT); | |
818 | return r; | |
819 | } | |
820 | ||
705578c3 | 821 | return 1; |
9727f242 DDM |
822 | } |
823 | ||
01f78473 | 824 | static const char* const path_type_table[_PATH_TYPE_MAX] = { |
48d83e33 ZJS |
825 | [PATH_EXISTS] = "PathExists", |
826 | [PATH_EXISTS_GLOB] = "PathExistsGlob", | |
2c5859af | 827 | [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty", |
48d83e33 ZJS |
828 | [PATH_CHANGED] = "PathChanged", |
829 | [PATH_MODIFIED] = "PathModified", | |
01f78473 LP |
830 | }; |
831 | ||
832 | DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); | |
833 | ||
cd43ca73 | 834 | static const char* const path_result_table[_PATH_RESULT_MAX] = { |
40f41f34 DDM |
835 | [PATH_SUCCESS] = "success", |
836 | [PATH_FAILURE_RESOURCES] = "resources", | |
837 | [PATH_FAILURE_START_LIMIT_HIT] = "start-limit-hit", | |
838 | [PATH_FAILURE_UNIT_START_LIMIT_HIT] = "unit-start-limit-hit", | |
cd43ca73 LP |
839 | }; |
840 | ||
841 | DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult); | |
842 | ||
01f78473 | 843 | const UnitVTable path_vtable = { |
7d17cfbc | 844 | .object_size = sizeof(Path), |
718db961 | 845 | |
f975e971 LP |
846 | .sections = |
847 | "Unit\0" | |
848 | "Path\0" | |
849 | "Install\0", | |
5b9fbf89 YW |
850 | .private_section = "Path", |
851 | ||
852 | .can_transient = true, | |
c80a9a33 LP |
853 | .can_fail = true, |
854 | .can_trigger = true, | |
01f78473 | 855 | |
0e456f97 | 856 | .init = path_init, |
01f78473 LP |
857 | .done = path_done, |
858 | .load = path_load, | |
859 | ||
860 | .coldplug = path_coldplug, | |
861 | ||
862 | .dump = path_dump, | |
863 | ||
864 | .start = path_start, | |
865 | .stop = path_stop, | |
866 | ||
867 | .serialize = path_serialize, | |
868 | .deserialize_item = path_deserialize_item, | |
869 | ||
870 | .active_state = path_active_state, | |
871 | .sub_state_to_string = path_sub_state_to_string, | |
872 | ||
3ecaa09b LP |
873 | .trigger_notify = path_trigger_notify, |
874 | ||
fdf20a31 | 875 | .reset_failed = path_reset_failed, |
5632e374 | 876 | |
5b9fbf89 | 877 | .bus_set_property = bus_path_set_property, |
9727f242 | 878 | |
705578c3 | 879 | .can_start = path_can_start, |
01f78473 | 880 | }; |