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9444b1f2 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <string.h> | |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | ||
c3350683 | 26 | #include "sd-messages.h" |
fb6becb4 | 27 | |
9444b1f2 LP |
28 | #include "util.h" |
29 | #include "mkdir.h" | |
9444b1f2 LP |
30 | #include "hashmap.h" |
31 | #include "strv.h" | |
32 | #include "fileio.h" | |
33 | #include "special.h" | |
fb6becb4 | 34 | #include "unit-name.h" |
1ee306e1 | 35 | #include "machine.h" |
c3350683 LP |
36 | #include "bus-util.h" |
37 | #include "bus-error.h" | |
9444b1f2 LP |
38 | |
39 | Machine* machine_new(Manager *manager, const char *name) { | |
40 | Machine *m; | |
41 | ||
42 | assert(manager); | |
43 | assert(name); | |
44 | ||
45 | m = new0(Machine, 1); | |
46 | if (!m) | |
47 | return NULL; | |
48 | ||
49 | m->name = strdup(name); | |
50 | if (!m->name) | |
51 | goto fail; | |
52 | ||
53 | m->state_file = strappend("/run/systemd/machines/", m->name); | |
54 | if (!m->state_file) | |
55 | goto fail; | |
56 | ||
57 | if (hashmap_put(manager->machines, m->name, m) < 0) | |
58 | goto fail; | |
59 | ||
60 | m->class = _MACHINE_CLASS_INVALID; | |
61 | m->manager = manager; | |
62 | ||
63 | return m; | |
64 | ||
65 | fail: | |
66 | free(m->state_file); | |
67 | free(m->name); | |
68 | free(m); | |
69 | ||
70 | return NULL; | |
71 | } | |
72 | ||
73 | void machine_free(Machine *m) { | |
74 | assert(m); | |
75 | ||
76 | if (m->in_gc_queue) | |
71fda00f | 77 | LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m); |
9444b1f2 | 78 | |
89f7c846 LP |
79 | if (m->unit) { |
80 | hashmap_remove(m->manager->machine_units, m->unit); | |
81 | free(m->unit); | |
9444b1f2 LP |
82 | } |
83 | ||
fb6becb4 LP |
84 | free(m->scope_job); |
85 | ||
9444b1f2 LP |
86 | hashmap_remove(m->manager->machines, m->name); |
87 | ||
d3e84ddb LP |
88 | if (m->leader > 0) |
89 | hashmap_remove_value(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m); | |
90 | ||
c3350683 | 91 | sd_bus_message_unref(m->create_message); |
fb6becb4 | 92 | |
9444b1f2 LP |
93 | free(m->name); |
94 | free(m->state_file); | |
95 | free(m->service); | |
9444b1f2 LP |
96 | free(m->root_directory); |
97 | free(m); | |
98 | } | |
99 | ||
100 | int machine_save(Machine *m) { | |
101 | _cleanup_free_ char *temp_path = NULL; | |
102 | _cleanup_fclose_ FILE *f = NULL; | |
103 | int r; | |
104 | ||
105 | assert(m); | |
106 | assert(m->state_file); | |
107 | ||
108 | if (!m->started) | |
109 | return 0; | |
110 | ||
111 | r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0); | |
112 | if (r < 0) | |
113 | goto finish; | |
114 | ||
115 | r = fopen_temporary(m->state_file, &f, &temp_path); | |
116 | if (r < 0) | |
117 | goto finish; | |
118 | ||
119 | fchmod(fileno(f), 0644); | |
120 | ||
121 | fprintf(f, | |
122 | "# This is private data. Do not parse.\n" | |
123 | "NAME=%s\n", | |
124 | m->name); | |
125 | ||
ca5405bb LP |
126 | if (m->unit) { |
127 | _cleanup_free_ char *escaped; | |
128 | ||
129 | escaped = cescape(m->unit); | |
130 | if (!escaped) { | |
131 | r = -ENOMEM; | |
132 | goto finish; | |
133 | } | |
134 | ||
135 | fprintf(f, "SCOPE=%s\n", escaped); /* We continue to call this "SCOPE=" because it is internal only, and we want to stay compatible with old files */ | |
136 | } | |
fb6becb4 LP |
137 | |
138 | if (m->scope_job) | |
139 | fprintf(f, "SCOPE_JOB=%s\n", m->scope_job); | |
9444b1f2 | 140 | |
ca5405bb LP |
141 | if (m->service) { |
142 | _cleanup_free_ char *escaped; | |
9444b1f2 | 143 | |
ca5405bb LP |
144 | escaped = cescape(m->service); |
145 | if (!escaped) { | |
146 | r = -ENOMEM; | |
147 | goto finish; | |
148 | } | |
149 | fprintf(f, "SERVICE=%s\n", escaped); | |
150 | } | |
151 | ||
152 | if (m->root_directory) { | |
153 | _cleanup_free_ char *escaped; | |
154 | ||
155 | escaped = cescape(m->root_directory); | |
156 | if (!escaped) { | |
157 | r = -ENOMEM; | |
158 | goto finish; | |
159 | } | |
160 | fprintf(f, "ROOT=%s\n", escaped); | |
161 | } | |
9444b1f2 LP |
162 | |
163 | if (!sd_id128_equal(m->id, SD_ID128_NULL)) | |
164 | fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id)); | |
165 | ||
166 | if (m->leader != 0) | |
90b2de37 | 167 | fprintf(f, "LEADER="PID_FMT"\n", m->leader); |
9444b1f2 LP |
168 | |
169 | if (m->class != _MACHINE_CLASS_INVALID) | |
170 | fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class)); | |
171 | ||
172 | if (dual_timestamp_is_set(&m->timestamp)) | |
173 | fprintf(f, | |
90b2de37 ZJS |
174 | "REALTIME="USEC_FMT"\n" |
175 | "MONOTONIC="USEC_FMT"\n", | |
176 | m->timestamp.realtime, | |
177 | m->timestamp.monotonic); | |
9444b1f2 LP |
178 | |
179 | fflush(f); | |
180 | ||
181 | if (ferror(f) || rename(temp_path, m->state_file) < 0) { | |
182 | r = -errno; | |
183 | unlink(m->state_file); | |
184 | unlink(temp_path); | |
185 | } | |
186 | ||
89f7c846 LP |
187 | if (m->unit) { |
188 | char *sl; | |
189 | ||
190 | /* Create a symlink from the unit name to the machine | |
191 | * name, so that we can quickly find the machine for | |
192 | * each given unit */ | |
193 | sl = strappenda("/run/systemd/machines/unit:", m->unit); | |
194 | symlink(m->name, sl); | |
195 | } | |
196 | ||
9444b1f2 LP |
197 | finish: |
198 | if (r < 0) | |
90b2de37 | 199 | log_error("Failed to save machine data %s: %s", m->state_file, strerror(-r)); |
9444b1f2 LP |
200 | |
201 | return r; | |
202 | } | |
203 | ||
89f7c846 LP |
204 | static void machine_unlink(Machine *m) { |
205 | assert(m); | |
206 | ||
207 | if (m->unit) { | |
208 | ||
209 | char *sl; | |
210 | ||
211 | sl = strappenda("/run/systemd/machines/unit:", m->unit); | |
212 | unlink(sl); | |
213 | } | |
214 | ||
215 | if (m->state_file) | |
216 | unlink(m->state_file); | |
217 | } | |
218 | ||
9444b1f2 LP |
219 | int machine_load(Machine *m) { |
220 | _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL; | |
221 | int r; | |
222 | ||
223 | assert(m); | |
224 | ||
225 | r = parse_env_file(m->state_file, NEWLINE, | |
89f7c846 | 226 | "SCOPE", &m->unit, |
fb6becb4 | 227 | "SCOPE_JOB", &m->scope_job, |
9444b1f2 | 228 | "SERVICE", &m->service, |
9444b1f2 LP |
229 | "ROOT", &m->root_directory, |
230 | "ID", &id, | |
231 | "LEADER", &leader, | |
232 | "CLASS", &class, | |
233 | "REALTIME", &realtime, | |
234 | "MONOTONIC", &monotonic, | |
235 | NULL); | |
236 | if (r < 0) { | |
237 | if (r == -ENOENT) | |
238 | return 0; | |
239 | ||
240 | log_error("Failed to read %s: %s", m->state_file, strerror(-r)); | |
241 | return r; | |
242 | } | |
243 | ||
244 | if (id) | |
245 | sd_id128_from_string(id, &m->id); | |
246 | ||
247 | if (leader) | |
248 | parse_pid(leader, &m->leader); | |
249 | ||
250 | if (class) { | |
251 | MachineClass c; | |
252 | ||
253 | c = machine_class_from_string(class); | |
254 | if (c >= 0) | |
255 | m->class = c; | |
256 | } | |
257 | ||
258 | if (realtime) { | |
259 | unsigned long long l; | |
260 | if (sscanf(realtime, "%llu", &l) > 0) | |
261 | m->timestamp.realtime = l; | |
262 | } | |
263 | ||
264 | if (monotonic) { | |
265 | unsigned long long l; | |
266 | if (sscanf(monotonic, "%llu", &l) > 0) | |
267 | m->timestamp.monotonic = l; | |
268 | } | |
269 | ||
270 | return r; | |
271 | } | |
272 | ||
c3350683 | 273 | static int machine_start_scope(Machine *m, sd_bus_message *properties, sd_bus_error *error) { |
2c4c73b3 | 274 | int r = 0; |
9444b1f2 LP |
275 | |
276 | assert(m); | |
277 | ||
89f7c846 | 278 | if (!m->unit) { |
d0af76e6 | 279 | _cleanup_free_ char *escaped = NULL; |
39883f62 | 280 | char *scope, *description, *job = NULL; |
9444b1f2 | 281 | |
fb6becb4 | 282 | escaped = unit_name_escape(m->name); |
9444b1f2 LP |
283 | if (!escaped) |
284 | return log_oom(); | |
285 | ||
d0af76e6 | 286 | scope = strjoin("machine-", escaped, ".scope", NULL); |
f526ab7e | 287 | if (!scope) |
9444b1f2 | 288 | return log_oom(); |
9444b1f2 | 289 | |
c3350683 | 290 | description = strappenda(m->class == MACHINE_VM ? "Virtual Machine " : "Container ", m->name); |
9444b1f2 | 291 | |
c3350683 | 292 | r = manager_start_scope(m->manager, scope, m->leader, SPECIAL_MACHINE_SLICE, description, properties, error, &job); |
d0af76e6 | 293 | if (r < 0) { |
c3350683 | 294 | log_error("Failed to start machine scope: %s", bus_error_message(error, r)); |
d0af76e6 | 295 | free(scope); |
f2d4f98d | 296 | return r; |
d0af76e6 | 297 | } else { |
89f7c846 | 298 | m->unit = scope; |
d0af76e6 LP |
299 | |
300 | free(m->scope_job); | |
301 | m->scope_job = job; | |
302 | } | |
9444b1f2 LP |
303 | } |
304 | ||
89f7c846 LP |
305 | if (m->unit) |
306 | hashmap_put(m->manager->machine_units, m->unit, m); | |
d0af76e6 | 307 | |
fb6becb4 | 308 | return r; |
9444b1f2 LP |
309 | } |
310 | ||
c3350683 | 311 | int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) { |
9444b1f2 LP |
312 | int r; |
313 | ||
314 | assert(m); | |
315 | ||
316 | if (m->started) | |
317 | return 0; | |
318 | ||
d3e84ddb LP |
319 | r = hashmap_put(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m); |
320 | if (r < 0) | |
321 | return r; | |
322 | ||
fb6becb4 | 323 | /* Create cgroup */ |
c3350683 | 324 | r = machine_start_scope(m, properties, error); |
fb6becb4 LP |
325 | if (r < 0) |
326 | return r; | |
327 | ||
9444b1f2 LP |
328 | log_struct(LOG_INFO, |
329 | MESSAGE_ID(SD_MESSAGE_MACHINE_START), | |
330 | "NAME=%s", m->name, | |
de0671ee | 331 | "LEADER="PID_FMT, m->leader, |
9444b1f2 LP |
332 | "MESSAGE=New machine %s.", m->name, |
333 | NULL); | |
334 | ||
9444b1f2 LP |
335 | if (!dual_timestamp_is_set(&m->timestamp)) |
336 | dual_timestamp_get(&m->timestamp); | |
337 | ||
338 | m->started = true; | |
339 | ||
340 | /* Save new machine data */ | |
341 | machine_save(m); | |
342 | ||
343 | machine_send_signal(m, true); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
fb6becb4 | 348 | static int machine_stop_scope(Machine *m) { |
c3350683 | 349 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
39883f62 | 350 | char *job = NULL; |
9444b1f2 | 351 | int r; |
9444b1f2 LP |
352 | |
353 | assert(m); | |
354 | ||
89f7c846 | 355 | if (!m->unit) |
fb6becb4 | 356 | return 0; |
9444b1f2 | 357 | |
89f7c846 | 358 | r = manager_stop_unit(m->manager, m->unit, &error, &job); |
fb6becb4 | 359 | if (r < 0) { |
c3350683 | 360 | log_error("Failed to stop machine scope: %s", bus_error_message(&error, r)); |
fb6becb4 LP |
361 | return r; |
362 | } | |
9444b1f2 | 363 | |
fb6becb4 LP |
364 | free(m->scope_job); |
365 | m->scope_job = job; | |
9444b1f2 LP |
366 | |
367 | return r; | |
368 | } | |
369 | ||
370 | int machine_stop(Machine *m) { | |
371 | int r = 0, k; | |
372 | assert(m); | |
373 | ||
374 | if (m->started) | |
375 | log_struct(LOG_INFO, | |
376 | MESSAGE_ID(SD_MESSAGE_MACHINE_STOP), | |
377 | "NAME=%s", m->name, | |
de0671ee | 378 | "LEADER="PID_FMT, m->leader, |
9444b1f2 LP |
379 | "MESSAGE=Machine %s terminated.", m->name, |
380 | NULL); | |
381 | ||
382 | /* Kill cgroup */ | |
fb6becb4 | 383 | k = machine_stop_scope(m); |
9444b1f2 LP |
384 | if (k < 0) |
385 | r = k; | |
386 | ||
89f7c846 | 387 | machine_unlink(m); |
9444b1f2 LP |
388 | machine_add_to_gc_queue(m); |
389 | ||
390 | if (m->started) | |
391 | machine_send_signal(m, false); | |
392 | ||
393 | m->started = false; | |
394 | ||
395 | return r; | |
396 | } | |
397 | ||
a658cafa | 398 | bool machine_check_gc(Machine *m, bool drop_not_started) { |
9444b1f2 LP |
399 | assert(m); |
400 | ||
401 | if (drop_not_started && !m->started) | |
c3350683 | 402 | return false; |
9444b1f2 | 403 | |
c3350683 LP |
404 | if (m->scope_job && manager_job_is_active(m->manager, m->scope_job)) |
405 | return true; | |
9444b1f2 | 406 | |
89f7c846 | 407 | if (m->unit && manager_unit_is_active(m->manager, m->unit)) |
c3350683 | 408 | return true; |
9444b1f2 | 409 | |
c3350683 | 410 | return false; |
9444b1f2 LP |
411 | } |
412 | ||
413 | void machine_add_to_gc_queue(Machine *m) { | |
414 | assert(m); | |
415 | ||
416 | if (m->in_gc_queue) | |
417 | return; | |
418 | ||
71fda00f | 419 | LIST_PREPEND(gc_queue, m->manager->machine_gc_queue, m); |
9444b1f2 LP |
420 | m->in_gc_queue = true; |
421 | } | |
422 | ||
fb6becb4 LP |
423 | MachineState machine_get_state(Machine *s) { |
424 | assert(s); | |
9444b1f2 | 425 | |
fb6becb4 LP |
426 | if (s->scope_job) |
427 | return s->started ? MACHINE_OPENING : MACHINE_CLOSING; | |
9444b1f2 | 428 | |
fb6becb4 LP |
429 | return MACHINE_RUNNING; |
430 | } | |
9444b1f2 | 431 | |
fb6becb4 LP |
432 | int machine_kill(Machine *m, KillWho who, int signo) { |
433 | assert(m); | |
9444b1f2 | 434 | |
89f7c846 | 435 | if (!m->unit) |
fb6becb4 | 436 | return -ESRCH; |
9444b1f2 | 437 | |
de58a50e LP |
438 | if (who == KILL_LEADER) { |
439 | /* If we shall simply kill the leader, do so directly */ | |
440 | ||
441 | if (kill(m->leader, signo) < 0) | |
442 | return -errno; | |
443 | } | |
444 | ||
445 | /* Otherwise make PID 1 do it for us, for the entire cgroup */ | |
446 | return manager_kill_unit(m->manager, m->unit, signo, NULL); | |
9444b1f2 LP |
447 | } |
448 | ||
449 | static const char* const machine_class_table[_MACHINE_CLASS_MAX] = { | |
450 | [MACHINE_CONTAINER] = "container", | |
451 | [MACHINE_VM] = "vm" | |
452 | }; | |
453 | ||
454 | DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass); | |
fb6becb4 LP |
455 | |
456 | static const char* const machine_state_table[_MACHINE_STATE_MAX] = { | |
457 | [MACHINE_OPENING] = "opening", | |
458 | [MACHINE_RUNNING] = "running", | |
459 | [MACHINE_CLOSING] = "closing" | |
460 | }; | |
461 | ||
462 | DEFINE_STRING_TABLE_LOOKUP(machine_state, MachineState); | |
1ee306e1 LP |
463 | |
464 | static const char* const kill_who_table[_KILL_WHO_MAX] = { | |
465 | [KILL_LEADER] = "leader", | |
466 | [KILL_ALL] = "all" | |
467 | }; | |
468 | ||
469 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |