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3572d3df LP |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
807542be | 3 | #include "bus-map-properties.h" |
3572d3df LP |
4 | #include "bus-wait-for-units.h" |
5 | #include "hashmap.h" | |
6 | #include "string-util.h" | |
7 | #include "strv.h" | |
8 | #include "unit-def.h" | |
9 | ||
10 | typedef struct WaitForItem { | |
11 | BusWaitForUnits *parent; | |
12 | ||
13 | BusWaitForUnitsFlags flags; | |
14 | ||
15 | char *bus_path; | |
16 | ||
17 | sd_bus_slot *slot_get_all; | |
18 | sd_bus_slot *slot_properties_changed; | |
19 | ||
20 | bus_wait_for_units_unit_callback unit_callback; | |
21 | void *userdata; | |
22 | ||
23 | char *active_state; | |
24 | uint32_t job_id; | |
25 | char *clean_result; | |
26 | } WaitForItem; | |
27 | ||
28 | typedef struct BusWaitForUnits { | |
29 | sd_bus *bus; | |
30 | sd_bus_slot *slot_disconnected; | |
31 | ||
32 | Hashmap *items; | |
33 | ||
34 | bus_wait_for_units_ready_callback ready_callback; | |
35 | void *userdata; | |
36 | ||
37 | WaitForItem *current; | |
38 | ||
39 | BusWaitForUnitsState state; | |
40 | bool has_failed:1; | |
41 | } BusWaitForUnits; | |
42 | ||
43 | static WaitForItem *wait_for_item_free(WaitForItem *item) { | |
44 | int r; | |
45 | ||
46 | if (!item) | |
47 | return NULL; | |
48 | ||
49 | if (item->parent) { | |
50 | if (FLAGS_SET(item->flags, BUS_WAIT_REFFED) && item->bus_path && item->parent->bus) { | |
51 | r = sd_bus_call_method_async( | |
52 | item->parent->bus, | |
53 | NULL, | |
54 | "org.freedesktop.systemd1", | |
55 | item->bus_path, | |
56 | "org.freedesktop.systemd1.Unit", | |
57 | "Unref", | |
58 | NULL, | |
59 | NULL, | |
60 | NULL); | |
61 | if (r < 0) | |
62 | log_debug_errno(r, "Failed to drop reference to unit %s, ignoring: %m", item->bus_path); | |
63 | } | |
64 | ||
65 | assert_se(hashmap_remove(item->parent->items, item->bus_path) == item); | |
66 | ||
67 | if (item->parent->current == item) | |
68 | item->parent->current = NULL; | |
69 | } | |
70 | ||
71 | sd_bus_slot_unref(item->slot_properties_changed); | |
72 | sd_bus_slot_unref(item->slot_get_all); | |
73 | ||
74 | free(item->bus_path); | |
75 | free(item->active_state); | |
76 | free(item->clean_result); | |
77 | ||
78 | return mfree(item); | |
79 | } | |
80 | ||
81 | DEFINE_TRIVIAL_CLEANUP_FUNC(WaitForItem*, wait_for_item_free); | |
82 | ||
d3d53e5c ZJS |
83 | static void call_unit_callback_and_wait(BusWaitForUnits *d, WaitForItem *item, bool good) { |
84 | d->current = item; | |
85 | ||
86 | if (item->unit_callback) | |
87 | item->unit_callback(d, item->bus_path, good, item->userdata); | |
88 | ||
89 | wait_for_item_free(item); | |
90 | } | |
91 | ||
3572d3df LP |
92 | static void bus_wait_for_units_clear(BusWaitForUnits *d) { |
93 | WaitForItem *item; | |
94 | ||
95 | assert(d); | |
96 | ||
97 | d->slot_disconnected = sd_bus_slot_unref(d->slot_disconnected); | |
98 | d->bus = sd_bus_unref(d->bus); | |
99 | ||
d3d53e5c ZJS |
100 | while ((item = hashmap_first(d->items))) |
101 | call_unit_callback_and_wait(d, item, false); | |
3572d3df LP |
102 | |
103 | d->items = hashmap_free(d->items); | |
104 | } | |
105 | ||
106 | static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) { | |
107 | BusWaitForUnits *d = userdata; | |
108 | ||
109 | assert(m); | |
110 | assert(d); | |
111 | ||
112 | log_error("Warning! D-Bus connection terminated."); | |
113 | ||
114 | bus_wait_for_units_clear(d); | |
115 | ||
116 | if (d->ready_callback) | |
117 | d->ready_callback(d, false, d->userdata); | |
118 | else /* If no ready callback is specified close the connection so that the event loop exits */ | |
119 | sd_bus_close(sd_bus_message_get_bus(m)); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | int bus_wait_for_units_new(sd_bus *bus, BusWaitForUnits **ret) { | |
125 | _cleanup_(bus_wait_for_units_freep) BusWaitForUnits *d = NULL; | |
126 | int r; | |
127 | ||
128 | assert(bus); | |
129 | assert(ret); | |
130 | ||
131 | d = new(BusWaitForUnits, 1); | |
132 | if (!d) | |
133 | return -ENOMEM; | |
134 | ||
135 | *d = (BusWaitForUnits) { | |
136 | .state = BUS_WAIT_SUCCESS, | |
137 | .bus = sd_bus_ref(bus), | |
138 | }; | |
139 | ||
140 | r = sd_bus_match_signal_async( | |
141 | bus, | |
142 | &d->slot_disconnected, | |
143 | "org.freedesktop.DBus.Local", | |
144 | NULL, | |
145 | "org.freedesktop.DBus.Local", | |
146 | "Disconnected", | |
147 | match_disconnected, NULL, d); | |
148 | if (r < 0) | |
149 | return r; | |
150 | ||
151 | *ret = TAKE_PTR(d); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | BusWaitForUnits* bus_wait_for_units_free(BusWaitForUnits *d) { | |
156 | if (!d) | |
157 | return NULL; | |
158 | ||
159 | bus_wait_for_units_clear(d); | |
160 | sd_bus_slot_unref(d->slot_disconnected); | |
161 | sd_bus_unref(d->bus); | |
162 | ||
163 | return mfree(d); | |
164 | } | |
165 | ||
166 | static bool bus_wait_for_units_is_ready(BusWaitForUnits *d) { | |
167 | assert(d); | |
168 | ||
169 | if (!d->bus) /* Disconnected? */ | |
170 | return true; | |
171 | ||
172 | return hashmap_isempty(d->items); | |
173 | } | |
174 | ||
175 | void bus_wait_for_units_set_ready_callback(BusWaitForUnits *d, bus_wait_for_units_ready_callback callback, void *userdata) { | |
176 | assert(d); | |
177 | ||
178 | d->ready_callback = callback; | |
179 | d->userdata = userdata; | |
180 | } | |
181 | ||
182 | static void bus_wait_for_units_check_ready(BusWaitForUnits *d) { | |
183 | assert(d); | |
184 | ||
185 | if (!bus_wait_for_units_is_ready(d)) | |
186 | return; | |
187 | ||
188 | d->state = d->has_failed ? BUS_WAIT_FAILURE : BUS_WAIT_SUCCESS; | |
189 | ||
190 | if (d->ready_callback) | |
191 | d->ready_callback(d, d->state, d->userdata); | |
192 | } | |
193 | ||
194 | static void wait_for_item_check_ready(WaitForItem *item) { | |
195 | BusWaitForUnits *d; | |
196 | ||
197 | assert(item); | |
60b17d6f | 198 | assert_se(d = item->parent); |
3572d3df LP |
199 | |
200 | if (FLAGS_SET(item->flags, BUS_WAIT_FOR_MAINTENANCE_END)) { | |
201 | ||
202 | if (item->clean_result && !streq(item->clean_result, "success")) | |
203 | d->has_failed = true; | |
204 | ||
205 | if (!item->active_state || streq(item->active_state, "maintenance")) | |
206 | return; | |
207 | } | |
208 | ||
209 | if (FLAGS_SET(item->flags, BUS_WAIT_NO_JOB) && item->job_id != 0) | |
210 | return; | |
211 | ||
212 | if (FLAGS_SET(item->flags, BUS_WAIT_FOR_INACTIVE)) { | |
213 | ||
214 | if (streq_ptr(item->active_state, "failed")) | |
215 | d->has_failed = true; | |
216 | else if (!streq_ptr(item->active_state, "inactive")) | |
217 | return; | |
218 | } | |
219 | ||
d3d53e5c | 220 | call_unit_callback_and_wait(d, item, true); |
3572d3df LP |
221 | bus_wait_for_units_check_ready(d); |
222 | } | |
223 | ||
224 | static int property_map_job( | |
225 | sd_bus *bus, | |
226 | const char *member, | |
227 | sd_bus_message *m, | |
228 | sd_bus_error *error, | |
229 | void *userdata) { | |
230 | ||
231 | WaitForItem *item = userdata; | |
232 | const char *path; | |
233 | uint32_t id; | |
234 | int r; | |
235 | ||
236 | assert(item); | |
237 | ||
238 | r = sd_bus_message_read(m, "(uo)", &id, &path); | |
239 | if (r < 0) | |
240 | return r; | |
241 | ||
242 | item->job_id = id; | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static int wait_for_item_parse_properties(WaitForItem *item, sd_bus_message *m) { | |
247 | ||
248 | static const struct bus_properties_map map[] = { | |
249 | { "ActiveState", "s", NULL, offsetof(WaitForItem, active_state) }, | |
250 | { "Job", "(uo)", property_map_job, 0 }, | |
251 | { "CleanResult", "s", NULL, offsetof(WaitForItem, clean_result) }, | |
252 | {} | |
253 | }; | |
254 | ||
255 | int r; | |
256 | ||
257 | assert(item); | |
258 | assert(m); | |
259 | ||
260 | r = bus_message_map_all_properties(m, map, BUS_MAP_STRDUP, NULL, item); | |
261 | if (r < 0) | |
262 | return r; | |
263 | ||
264 | wait_for_item_check_ready(item); | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int on_properties_changed(sd_bus_message *m, void *userdata, sd_bus_error *error) { | |
269 | WaitForItem *item = userdata; | |
270 | const char *interface; | |
271 | int r; | |
272 | ||
273 | assert(item); | |
274 | ||
275 | r = sd_bus_message_read(m, "s", &interface); | |
276 | if (r < 0) { | |
277 | log_debug_errno(r, "Failed to parse PropertiesChanged signal: %m"); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | if (!streq(interface, "org.freedesktop.systemd1.Unit")) | |
282 | return 0; | |
283 | ||
284 | r = wait_for_item_parse_properties(item, m); | |
285 | if (r < 0) | |
286 | log_debug_errno(r, "Failed to process PropertiesChanged signal: %m"); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static int on_get_all_properties(sd_bus_message *m, void *userdata, sd_bus_error *error) { | |
292 | WaitForItem *item = userdata; | |
293 | int r; | |
294 | ||
295 | assert(item); | |
296 | ||
297 | if (sd_bus_error_is_set(error)) { | |
298 | BusWaitForUnits *d = item->parent; | |
299 | ||
300 | d->has_failed = true; | |
301 | ||
302 | log_debug_errno(sd_bus_error_get_errno(error), "GetAll() failed for %s: %s", | |
303 | item->bus_path, error->message); | |
304 | ||
d3d53e5c | 305 | call_unit_callback_and_wait(d, item, false); |
3572d3df LP |
306 | bus_wait_for_units_check_ready(d); |
307 | return 0; | |
308 | } | |
309 | ||
310 | r = wait_for_item_parse_properties(item, m); | |
311 | if (r < 0) | |
312 | log_debug_errno(r, "Failed to process GetAll method reply: %m"); | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | int bus_wait_for_units_add_unit( | |
318 | BusWaitForUnits *d, | |
319 | const char *unit, | |
320 | BusWaitForUnitsFlags flags, | |
321 | bus_wait_for_units_unit_callback callback, | |
322 | void *userdata) { | |
323 | ||
324 | _cleanup_(wait_for_item_freep) WaitForItem *item = NULL; | |
325 | int r; | |
326 | ||
327 | assert(d); | |
328 | assert(unit); | |
329 | ||
330 | assert(flags != 0); | |
331 | ||
332 | r = hashmap_ensure_allocated(&d->items, &string_hash_ops); | |
333 | if (r < 0) | |
334 | return r; | |
335 | ||
336 | item = new(WaitForItem, 1); | |
337 | if (!item) | |
338 | return -ENOMEM; | |
339 | ||
340 | *item = (WaitForItem) { | |
341 | .flags = flags, | |
342 | .bus_path = unit_dbus_path_from_name(unit), | |
343 | .unit_callback = callback, | |
344 | .userdata = userdata, | |
345 | .job_id = UINT32_MAX, | |
346 | }; | |
347 | ||
348 | if (!item->bus_path) | |
349 | return -ENOMEM; | |
350 | ||
351 | if (!FLAGS_SET(item->flags, BUS_WAIT_REFFED)) { | |
352 | r = sd_bus_call_method_async( | |
353 | d->bus, | |
354 | NULL, | |
355 | "org.freedesktop.systemd1", | |
356 | item->bus_path, | |
357 | "org.freedesktop.systemd1.Unit", | |
358 | "Ref", | |
359 | NULL, | |
360 | NULL, | |
361 | NULL); | |
362 | if (r < 0) | |
363 | return log_debug_errno(r, "Failed to add reference to unit %s: %m", unit); | |
364 | ||
3572d3df LP |
365 | item->flags |= BUS_WAIT_REFFED; |
366 | } | |
367 | ||
368 | r = sd_bus_match_signal_async( | |
369 | d->bus, | |
370 | &item->slot_properties_changed, | |
371 | "org.freedesktop.systemd1", | |
372 | item->bus_path, | |
373 | "org.freedesktop.DBus.Properties", | |
374 | "PropertiesChanged", | |
375 | on_properties_changed, | |
376 | NULL, | |
377 | item); | |
378 | if (r < 0) | |
379 | return log_debug_errno(r, "Failed to request match for PropertiesChanged signal: %m"); | |
380 | ||
381 | r = sd_bus_call_method_async( | |
382 | d->bus, | |
383 | &item->slot_get_all, | |
384 | "org.freedesktop.systemd1", | |
385 | item->bus_path, | |
386 | "org.freedesktop.DBus.Properties", | |
387 | "GetAll", | |
388 | on_get_all_properties, | |
389 | item, | |
390 | "s", FLAGS_SET(item->flags, BUS_WAIT_FOR_MAINTENANCE_END) ? NULL : "org.freedesktop.systemd1.Unit"); | |
391 | if (r < 0) | |
392 | return log_debug_errno(r, "Failed to request properties of unit %s: %m", unit); | |
393 | ||
394 | r = hashmap_put(d->items, item->bus_path, item); | |
395 | if (r < 0) | |
396 | return r; | |
397 | ||
398 | d->state = BUS_WAIT_RUNNING; | |
399 | item->parent = d; | |
400 | TAKE_PTR(item); | |
401 | return 0; | |
402 | } | |
403 | ||
404 | int bus_wait_for_units_run(BusWaitForUnits *d) { | |
405 | int r; | |
406 | ||
407 | assert(d); | |
408 | ||
409 | while (d->state == BUS_WAIT_RUNNING) { | |
410 | ||
411 | r = sd_bus_process(d->bus, NULL); | |
412 | if (r < 0) | |
413 | return r; | |
414 | if (r > 0) | |
415 | continue; | |
416 | ||
417 | r = sd_bus_wait(d->bus, (uint64_t) -1); | |
418 | if (r < 0) | |
419 | return r; | |
420 | } | |
421 | ||
422 | return d->state; | |
423 | } | |
424 | ||
425 | BusWaitForUnitsState bus_wait_for_units_state(BusWaitForUnits *d) { | |
426 | assert(d); | |
427 | ||
428 | return d->state; | |
429 | } |