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d6c9574f 1/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
60918275 2
a7334b09
LP		 3/***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 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 General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20***/
21
60918275
LP		 22#include <assert.h>
23#include <errno.h>
87d1515d 24#include <string.h>
9152c765
LP		 25#include <sys/epoll.h>
26#include <signal.h>
27#include <sys/signalfd.h>
28#include <sys/wait.h>
29#include <unistd.h>
30#include <sys/poll.h>
e1414003
LP		 31#include <sys/reboot.h>
32#include <sys/ioctl.h>
33#include <linux/kd.h>
80876c20
LP		 34#include <termios.h>
35#include <fcntl.h>
a16e1123
LP		 36#include <sys/types.h>
37#include <sys/stat.h>
fe51822e 38#include <dirent.h>
830f6caa
LP		 39
40#ifdef HAVE_AUDIT
4927fcae 41#include <libaudit.h>
830f6caa 42#endif
60918275
LP		 43
44#include "manager.h"
45#include "hashmap.h"
46#include "macro.h"
47#include "strv.h"
16354eff 48#include "log.h"
2a987ee8 49#include "util.h"
ea430986 50#include "ratelimit.h"
8e274523
LP		 51#include "cgroup.h"
52#include "mount-setup.h"
9e2f7c11 53#include "unit-name.h"
4139c1b2
LP		 54#include "dbus-unit.h"
55#include "dbus-job.h"
1137a57c 56#include "missing.h"
84e3543e 57#include "path-lookup.h"
514f4ef5 58#include "special.h"
398ef8ba 59#include "bus-errors.h"
d06dacd0 60#include "exit-status.h"
60918275 61
701cc384
LP		 62/* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
63#define GC_QUEUE_ENTRIES_MAX 16
64
65/* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
94b6dfa2 66#define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
701cc384 67
8c47c732 68/* Where clients shall send notification messages to */
2b583ce6 69#define NOTIFY_SOCKET_SYSTEM "/run/systemd/notify"
91b22f21 70#define NOTIFY_SOCKET_USER "@/org/freedesktop/systemd1/notify"
8c47c732
LP		 71
72static int manager_setup_notify(Manager *m) {
73 union {
74 struct sockaddr sa;
75 struct sockaddr_un un;
76 } sa;
77 struct epoll_event ev;
8c47c732
LP		 78 int one = 1;
79
80 assert(m);
81
82 m->notify_watch.type = WATCH_NOTIFY;
83 if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
84 log_error("Failed to allocate notification socket: %m");
85 return -errno;
86 }
87
88 zero(sa);
89 sa.sa.sa_family = AF_UNIX;
90
a821caaa 91 if (getpid() != 1)
91b22f21 92 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path), NOTIFY_SOCKET_USER "/%llu", random_ull());
6f79c579
LP		 93 else {
94 unlink(NOTIFY_SOCKET_SYSTEM);
91b22f21 95 strncpy(sa.un.sun_path, NOTIFY_SOCKET_SYSTEM, sizeof(sa.un.sun_path));
6f79c579 96 }
91b22f21
LP		 97
98 if (sa.un.sun_path[0] == '@')
99 sa.un.sun_path[0] = 0;
8c47c732 100
0e098b15 101 if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
8c47c732
LP		 102 log_error("bind() failed: %m");
103 return -errno;
104 }
105
106 if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
107 log_error("SO_PASSCRED failed: %m");
108 return -errno;
109 }
110
111 zero(ev);
112 ev.events = EPOLLIN;
113 ev.data.ptr = &m->notify_watch;
114
115 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
116 return -errno;
117
91b22f21
LP		 118 if (sa.un.sun_path[0] == 0)
119 sa.un.sun_path[0] = '@';
120
121 if (!(m->notify_socket = strdup(sa.un.sun_path)))
8c47c732
LP		 122 return -ENOMEM;
123
b2bb3dbe
LP		 124 log_debug("Using notification socket %s", m->notify_socket);
125
8c47c732
LP		 126 return 0;
127}
128
80876c20 129static int enable_special_signals(Manager *m) {
4466ee6a 130 int fd;
80876c20
LP		 131
132 assert(m);
133
134 /* Enable that we get SIGINT on control-alt-del */
135 if (reboot(RB_DISABLE_CAD) < 0)
136 log_warning("Failed to enable ctrl-alt-del handling: %m");
137
affda787 138 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
80876c20
LP		 139 log_warning("Failed to open /dev/tty0: %m");
140 else {
141 /* Enable that we get SIGWINCH on kbrequest */
142 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
143 log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
144
145 close_nointr_nofail(fd);
146 }
147
148 return 0;
149}
150
ce578209 151static int manager_setup_signals(Manager *m) {
9152c765
LP		 152 sigset_t mask;
153 struct epoll_event ev;
57c0c30e 154 struct sigaction sa;
60918275 155
ce578209
LP		 156 assert(m);
157
57c0c30e
LP		 158 /* We are not interested in SIGSTOP and friends. */
159 zero(sa);
160 sa.sa_handler = SIG_DFL;
161 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
162 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
163
ce578209 164 assert_se(sigemptyset(&mask) == 0);
7d793605
LP		 165
166 sigset_add_many(&mask,
167 SIGCHLD, /* Child died */
168 SIGTERM, /* Reexecute daemon */
169 SIGHUP, /* Reload configuration */
170 SIGUSR1, /* systemd/upstart: reconnect to D-Bus */
171 SIGUSR2, /* systemd: dump status */
172 SIGINT, /* Kernel sends us this on control-alt-del */
173 SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
174 SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
175 SIGRTMIN+0, /* systemd: start default.target */
0003d1ab 176 SIGRTMIN+1, /* systemd: isolate rescue.target */
7d793605
LP		 177 SIGRTMIN+2, /* systemd: isolate emergency.target */
178 SIGRTMIN+3, /* systemd: start halt.target */
179 SIGRTMIN+4, /* systemd: start poweroff.target */
180 SIGRTMIN+5, /* systemd: start reboot.target */
0003d1ab
LP		 181 SIGRTMIN+6, /* systemd: start kexec.target */
182 SIGRTMIN+13, /* systemd: Immediate halt */
183 SIGRTMIN+14, /* systemd: Immediate poweroff */
184 SIGRTMIN+15, /* systemd: Immediate reboot */
185 SIGRTMIN+16, /* systemd: Immediate kexec */
0658666b
LP		 186 SIGRTMIN+20, /* systemd: enable status messages */
187 SIGRTMIN+21, /* systemd: disable status messages */
7d793605 188 -1);
ce578209
LP		 189 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
190
ef734fd6 191 m->signal_watch.type = WATCH_SIGNAL;
ce578209
LP		 192 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
193 return -errno;
194
195 zero(ev);
196 ev.events = EPOLLIN;
197 ev.data.ptr = &m->signal_watch;
198
199 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
200 return -errno;
201
a3d4e06d 202 if (m->running_as == MANAGER_SYSTEM)
80876c20 203 return enable_special_signals(m);
e1414003 204
ce578209
LP		 205 return 0;
206}
207
9e58ff9c 208int manager_new(ManagerRunningAs running_as, Manager **_m) {
ce578209 209 Manager *m;
8e274523
LP		 210 int r = -ENOMEM;
211
212 assert(_m);
a5dab5ce
LP		 213 assert(running_as >= 0);
214 assert(running_as < _MANAGER_RUNNING_AS_MAX);
ce578209 215
60918275 216 if (!(m = new0(Manager, 1)))
8e274523 217 return -ENOMEM;
60918275 218
63983207 219 dual_timestamp_get(&m->startup_timestamp);
e537352b 220
a5dab5ce 221 m->running_as = running_as;
a567261a 222 m->name_data_slot = m->subscribed_data_slot = -1;
a16e1123 223 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
33be102a 224 m->pin_cgroupfs_fd = -1;
80876c20 225
4927fcae
LP		 226#ifdef HAVE_AUDIT
227 m->audit_fd = -1;
228#endif
229
4e434314 230 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
ea430986 231 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
9152c765 232
1137a57c
LP		 233 if (!(m->environment = strv_copy(environ)))
234 goto fail;
235
06d4c99a
LP		 236 if (!(m->default_controllers = strv_new("cpu", NULL)))
237 goto fail;
238
87f0e418 239 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
60918275
LP		 240 goto fail;
241
242 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
243 goto fail;
244
e5b5ae50 245 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
60918275
LP		 246 goto fail;
247
9152c765
LP		 248 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
249 goto fail;
250
8e274523
LP		 251 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
252 goto fail;
253
05e343b7
LP		 254 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
255 goto fail;
256
9152c765
LP		 257 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
258 goto fail;
259
84e3543e 260 if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
e1414003
LP		 261 goto fail;
262
8e274523
LP		 263 if ((r = manager_setup_signals(m)) < 0)
264 goto fail;
265
8e274523 266 if ((r = manager_setup_cgroup(m)) < 0)
9152c765
LP		 267 goto fail;
268
8c47c732
LP		 269 if ((r = manager_setup_notify(m)) < 0)
270 goto fail;
271
f278026d 272 /* Try to connect to the busses, if possible. */
3996fbe2 273 if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
ea430986
LP		 274 goto fail;
275
e543deae 276#ifdef HAVE_AUDIT
4927fcae
LP		 277 if ((m->audit_fd = audit_open()) < 0)
278 log_error("Failed to connect to audit log: %m");
e543deae 279#endif
4927fcae 280
72bc8d00
LP		 281 m->taint_usr = dir_is_empty("/usr") > 0;
282
8e274523
LP		 283 *_m = m;
284 return 0;
60918275
LP		 285
286fail:
287 manager_free(m);
8e274523 288 return r;
60918275
LP		 289}
290
23a177ef
LP		 291static unsigned manager_dispatch_cleanup_queue(Manager *m) {
292 Meta *meta;
293 unsigned n = 0;
294
295 assert(m);
296
297 while ((meta = m->cleanup_queue)) {
298 assert(meta->in_cleanup_queue);
299
399ab2b1 300 unit_free((Unit*) meta);
23a177ef
LP		 301 n++;
302 }
303
304 return n;
305}
306
eced69b3 307enum {
35b8ca3a 308 GC_OFFSET_IN_PATH, /* This one is on the path we were traveling */
eced69b3
LP		 309 GC_OFFSET_UNSURE, /* No clue */
310 GC_OFFSET_GOOD, /* We still need this unit */
311 GC_OFFSET_BAD, /* We don't need this unit anymore */
312 _GC_OFFSET_MAX
313};
314
315static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
701cc384
LP		 316 Iterator i;
317 Unit *other;
eced69b3 318 bool is_bad;
701cc384
LP		 319
320 assert(u);
321
eced69b3
LP		 322 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
323 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
324 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
701cc384
LP		 325 return;
326
c9c0cadb 327 if (u->meta.in_cleanup_queue)
701cc384
LP		 328 goto bad;
329
330 if (unit_check_gc(u))
331 goto good;
332
eced69b3
LP		 333 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
334
335 is_bad = true;
336
701cc384
LP		 337 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
338 unit_gc_sweep(other, gc_marker);
339
eced69b3 340 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
701cc384 341 goto good;
eced69b3
LP		 342
343 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
344 is_bad = false;
701cc384
LP		 345 }
346
eced69b3
LP		 347 if (is_bad)
348 goto bad;
349
350 /* We were unable to find anything out about this entry, so
351 * let's investigate it later */
352 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
353 unit_add_to_gc_queue(u);
354 return;
355
701cc384 356bad:
eced69b3
LP		 357 /* We definitely know that this one is not useful anymore, so
358 * let's mark it for deletion */
359 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
360 unit_add_to_cleanup_queue(u);
701cc384
LP		 361 return;
362
363good:
eced69b3 364 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
701cc384
LP		 365}
366
367static unsigned manager_dispatch_gc_queue(Manager *m) {
368 Meta *meta;
369 unsigned n = 0;
eced69b3 370 unsigned gc_marker;
701cc384
LP		 371
372 assert(m);
373
374 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
375 (m->gc_queue_timestamp <= 0 ||
376 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
377 return 0;
378
379 log_debug("Running GC...");
380
eced69b3
LP		 381 m->gc_marker += _GC_OFFSET_MAX;
382 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
c9c0cadb 383 m->gc_marker = 1;
701cc384 384
eced69b3
LP		 385 gc_marker = m->gc_marker;
386
701cc384
LP		 387 while ((meta = m->gc_queue)) {
388 assert(meta->in_gc_queue);
389
399ab2b1 390 unit_gc_sweep((Unit*) meta, gc_marker);
eced69b3 391
701cc384
LP		 392 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
393 meta->in_gc_queue = false;
394
395 n++;
396
eced69b3
LP		 397 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
398 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
701cc384 399 log_debug("Collecting %s", meta->id);
eced69b3 400 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
399ab2b1 401 unit_add_to_cleanup_queue((Unit*) meta);
701cc384
LP		 402 }
403 }
404
405 m->n_in_gc_queue = 0;
406 m->gc_queue_timestamp = 0;
407
408 return n;
409}
410
a16e1123 411static void manager_clear_jobs_and_units(Manager *m) {
e5b5ae50 412 Job *j;
a16e1123 413 Unit *u;
60918275
LP		 414
415 assert(m);
416
87f0e418 417 while ((j = hashmap_first(m->transaction_jobs)))
e5b5ae50
LP		 418 job_free(j);
419
87f0e418
LP		 420 while ((u = hashmap_first(m->units)))
421 unit_free(u);
964e0949
LP		 422
423 manager_dispatch_cleanup_queue(m);
424
425 assert(!m->load_queue);
426 assert(!m->run_queue);
427 assert(!m->dbus_unit_queue);
428 assert(!m->dbus_job_queue);
429 assert(!m->cleanup_queue);
430 assert(!m->gc_queue);
431
432 assert(hashmap_isempty(m->transaction_jobs));
433 assert(hashmap_isempty(m->jobs));
434 assert(hashmap_isempty(m->units));
a16e1123
LP		 435}
436
437void manager_free(Manager *m) {
438 UnitType c;
87f0e418 439
a16e1123
LP		 440 assert(m);
441
442 manager_clear_jobs_and_units(m);
23a177ef 443
7824bbeb
LP		 444 for (c = 0; c < _UNIT_TYPE_MAX; c++)
445 if (unit_vtable[c]->shutdown)
446 unit_vtable[c]->shutdown(m);
447
a16e1123
LP		 448 /* If we reexecute ourselves, we keep the root cgroup
449 * around */
c6c18be3 450 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
8e274523 451
5a1e9937
LP		 452 manager_undo_generators(m);
453
5e8d1c9a 454 bus_done(m);
ea430986 455
87f0e418 456 hashmap_free(m->units);
60918275 457 hashmap_free(m->jobs);
e5b5ae50 458 hashmap_free(m->transaction_jobs);
9152c765 459 hashmap_free(m->watch_pids);
05e343b7 460 hashmap_free(m->watch_bus);
9152c765
LP		 461
462 if (m->epoll_fd >= 0)
a16e1123 463 close_nointr_nofail(m->epoll_fd);
acbb0225 464 if (m->signal_watch.fd >= 0)
a16e1123 465 close_nointr_nofail(m->signal_watch.fd);
8c47c732
LP		 466 if (m->notify_watch.fd >= 0)
467 close_nointr_nofail(m->notify_watch.fd);
60918275 468
4927fcae
LP		 469#ifdef HAVE_AUDIT
470 if (m->audit_fd >= 0)
471 audit_close(m->audit_fd);
472#endif
473
c952c6ec
LP		 474 free(m->notify_socket);
475
84e3543e 476 lookup_paths_free(&m->lookup_paths);
1137a57c 477 strv_free(m->environment);
036643a2 478
06d4c99a
LP		 479 strv_free(m->default_controllers);
480
8e274523 481 hashmap_free(m->cgroup_bondings);
c6c18be3 482 set_free_free(m->unit_path_cache);
33be102a 483
60918275
LP		 484 free(m);
485}
486
a16e1123
LP		 487int manager_enumerate(Manager *m) {
488 int r = 0, q;
f50e0a01 489 UnitType c;
f50e0a01
LP		 490
491 assert(m);
492
a16e1123
LP		 493 /* Let's ask every type to load all units from disk/kernel
494 * that it might know */
f50e0a01
LP		 495 for (c = 0; c < _UNIT_TYPE_MAX; c++)
496 if (unit_vtable[c]->enumerate)
a16e1123
LP		 497 if ((q = unit_vtable[c]->enumerate(m)) < 0)
498 r = q;
f50e0a01
LP		 499
500 manager_dispatch_load_queue(m);
a16e1123
LP		 501 return r;
502}
503
504int manager_coldplug(Manager *m) {
505 int r = 0, q;
506 Iterator i;
507 Unit *u;
508 char *k;
509
510 assert(m);
f50e0a01
LP		 511
512 /* Then, let's set up their initial state. */
513 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
514
515 /* ignore aliases */
9e2f7c11 516 if (u->meta.id != k)
f50e0a01
LP		 517 continue;
518
cca098b0
LP		 519 if ((q = unit_coldplug(u)) < 0)
520 r = q;
f50e0a01
LP		 521 }
522
a16e1123
LP		 523 return r;
524}
525
fe51822e
LP		 526static void manager_build_unit_path_cache(Manager *m) {
527 char **i;
528 DIR *d = NULL;
529 int r;
530
531 assert(m);
532
533 set_free_free(m->unit_path_cache);
534
535 if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
536 log_error("Failed to allocate unit path cache.");
537 return;
538 }
539
540 /* This simply builds a list of files we know exist, so that
541 * we don't always have to go to disk */
542
543 STRV_FOREACH(i, m->lookup_paths.unit_path) {
544 struct dirent *de;
545
546 if (!(d = opendir(*i))) {
547 log_error("Failed to open directory: %m");
548 continue;
549 }
550
551 while ((de = readdir(d))) {
552 char *p;
553
554 if (ignore_file(de->d_name))
555 continue;
556
557 if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
558 r = -ENOMEM;
559 goto fail;
560 }
561
562 if ((r = set_put(m->unit_path_cache, p)) < 0) {
563 free(p);
564 goto fail;
565 }
566 }
567
568 closedir(d);
569 d = NULL;
570 }
571
572 return;
573
574fail:
575 log_error("Failed to build unit path cache: %s", strerror(-r));
576
577 set_free_free(m->unit_path_cache);
578 m->unit_path_cache = NULL;
579
580 if (d)
581 closedir(d);
582}
583
a16e1123
LP		 584int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
585 int r, q;
586
587 assert(m);
588
5a1e9937
LP		 589 manager_run_generators(m);
590
fe51822e
LP		 591 manager_build_unit_path_cache(m);
592
9f611ad8
LP		 593 /* If we will deserialize make sure that during enumeration
594 * this is already known, so we increase the counter here
595 * already */
596 if (serialization)
597 m->n_deserializing ++;
598
a16e1123
LP		 599 /* First, enumerate what we can from all config files */
600 r = manager_enumerate(m);
601
602 /* Second, deserialize if there is something to deserialize */
603 if (serialization)
604 if ((q = manager_deserialize(m, serialization, fds)) < 0)
605 r = q;
606
607 /* Third, fire things up! */
608 if ((q = manager_coldplug(m)) < 0)
609 r = q;
610
9f611ad8
LP		 611 if (serialization) {
612 assert(m->n_deserializing > 0);
613 m->n_deserializing --;
614 }
615
a16e1123 616 return r;
f50e0a01
LP		 617}
618
23a177ef 619static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
302d0040
LP		 620 assert(m);
621 assert(j);
622
1ffba6fe
LP		 623 /* Deletes one job from the transaction */
624
23a177ef 625 manager_transaction_unlink_job(m, j, delete_dependencies);
302d0040 626
ac1135be 627 if (!j->installed)
302d0040
LP		 628 job_free(j);
629}
630
87f0e418 631static void transaction_delete_unit(Manager *m, Unit *u) {
1ffba6fe
LP		 632 Job *j;
633
87f0e418 634 /* Deletes all jobs associated with a certain unit from the
1ffba6fe
LP		 635 * transaction */
636
87f0e418 637 while ((j = hashmap_get(m->transaction_jobs, u)))
23a177ef 638 transaction_delete_job(m, j, true);
1ffba6fe
LP		 639}
640
f04fa1d5
LP		 641static void transaction_clean_dependencies(Manager *m) {
642 Iterator i;
643 Job *j;
644
645 assert(m);
646
647 /* Drops all dependencies of all installed jobs */
648
649 HASHMAP_FOREACH(j, m->jobs, i) {
650 while (j->subject_list)
651 job_dependency_free(j->subject_list);
652 while (j->object_list)
653 job_dependency_free(j->object_list);
654 }
655
656 assert(!m->transaction_anchor);
657}
658
11dd41ce
LP		 659static void transaction_abort(Manager *m) {
660 Job *j;
661
662 assert(m);
11dd41ce 663
e5b5ae50 664 while ((j = hashmap_first(m->transaction_jobs)))
ac1135be 665 if (j->installed)
23a177ef 666 transaction_delete_job(m, j, true);
e5b5ae50
LP		 667 else
668 job_free(j);
669
670 assert(hashmap_isempty(m->transaction_jobs));
f04fa1d5
LP		 671
672 transaction_clean_dependencies(m);
e5b5ae50
LP		 673}
674
675static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
676 JobDependency *l;
677
678 assert(m);
679
87f0e418 680 /* A recursive sweep through the graph that marks all units
1ffba6fe
LP		 681 * that matter to the anchor job, i.e. are directly or
682 * indirectly a dependency of the anchor job via paths that
683 * are fully marked as mattering. */
684
44d8db9e
LP		 685 if (j)
686 l = j->subject_list;
687 else
688 l = m->transaction_anchor;
689
690 LIST_FOREACH(subject, l, l) {
e5b5ae50
LP		 691
692 /* This link does not matter */
693 if (!l->matters)
694 continue;
695
87f0e418 696 /* This unit has already been marked */
e5b5ae50
LP		 697 if (l->object->generation == generation)
698 continue;
699
700 l->object->matters_to_anchor = true;
701 l->object->generation = generation;
702
703 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
704 }
705}
706
7fad411c 707static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
e5b5ae50
LP		 708 JobDependency *l, *last;
709
710 assert(j);
711 assert(other);
87f0e418 712 assert(j->unit == other->unit);
ac1135be 713 assert(!j->installed);
e5b5ae50 714
1ffba6fe
LP		 715 /* Merges 'other' into 'j' and then deletes j. */
716
e5b5ae50
LP		 717 j->type = t;
718 j->state = JOB_WAITING;
9e2f7c11 719 j->override = j->override || other->override;
e5b5ae50
LP		 720
721 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
722
723 /* Patch us in as new owner of the JobDependency objects */
724 last = NULL;
44d8db9e 725 LIST_FOREACH(subject, l, other->subject_list) {
e5b5ae50
LP		 726 assert(l->subject == other);
727 l->subject = j;
728 last = l;
729 }
730
731 /* Merge both lists */
732 if (last) {
733 last->subject_next = j->subject_list;
734 if (j->subject_list)
735 j->subject_list->subject_prev = last;
736 j->subject_list = other->subject_list;
737 }
738
739 /* Patch us in as new owner of the JobDependency objects */
740 last = NULL;
44d8db9e 741 LIST_FOREACH(object, l, other->object_list) {
e5b5ae50
LP		 742 assert(l->object == other);
743 l->object = j;
744 last = l;
745 }
746
747 /* Merge both lists */
748 if (last) {
749 last->object_next = j->object_list;
750 if (j->object_list)
751 j->object_list->object_prev = last;
752 j->object_list = other->object_list;
753 }
754
e5b5ae50
LP		 755 /* Kill the other job */
756 other->subject_list = NULL;
757 other->object_list = NULL;
23a177ef 758 transaction_delete_job(m, other, true);
e5b5ae50 759}
69dd2852
LP		 760static bool job_is_conflicted_by(Job *j) {
761 JobDependency *l;
762
763 assert(j);
764
765 /* Returns true if this job is pulled in by a least one
766 * ConflictedBy dependency. */
767
768 LIST_FOREACH(object, l, j->object_list)
769 if (l->conflicts)
770 return true;
771
772 return false;
773}
e5b5ae50 774
5cb5a6ff 775static int delete_one_unmergeable_job(Manager *m, Job *j) {
1ffba6fe
LP		 776 Job *k;
777
778 assert(j);
779
780 /* Tries to delete one item in the linked list
781 * j->transaction_next->transaction_next->... that conflicts
35b8ca3a 782 * with another one, in an attempt to make an inconsistent
1ffba6fe
LP		 783 * transaction work. */
784
785 /* We rely here on the fact that if a merged with b does not
786 * merge with c, either a or b merge with c neither */
034c6ed7
LP		 787 LIST_FOREACH(transaction, j, j)
788 LIST_FOREACH(transaction, k, j->transaction_next) {
1ffba6fe
LP		 789 Job *d;
790
791 /* Is this one mergeable? Then skip it */
5cb5a6ff 792 if (job_type_is_mergeable(j->type, k->type))
1ffba6fe
LP		 793 continue;
794
795 /* Ok, we found two that conflict, let's see if we can
796 * drop one of them */
69dd2852
LP		 797 if (!j->matters_to_anchor && !k->matters_to_anchor) {
798
799 /* Both jobs don't matter, so let's
800 * find the one that is smarter to
801 * remove. Let's think positive and
802 * rather remove stops then starts --
803 * except if something is being
804 * stopped because it is conflicted by
805 * another unit in which case we
806 * rather remove the start. */
807
808 log_debug("Looking at job %s/%s conflicted_by=%s", j->unit->meta.id, job_type_to_string(j->type), yes_no(j->type == JOB_STOP && job_is_conflicted_by(j)));
809 log_debug("Looking at job %s/%s conflicted_by=%s", k->unit->meta.id, job_type_to_string(k->type), yes_no(k->type == JOB_STOP && job_is_conflicted_by(k)));
810
811 if (j->type == JOB_STOP) {
812
813 if (job_is_conflicted_by(j))
814 d = k;
815 else
816 d = j;
817
818 } else if (k->type == JOB_STOP) {
819
820 if (job_is_conflicted_by(k))
821 d = j;
822 else
823 d = k;
e364ad06
LP		 824 } else
825 d = j;
69dd2852
LP		 826
827 } else if (!j->matters_to_anchor)
1ffba6fe
LP		 828 d = j;
829 else if (!k->matters_to_anchor)
830 d = k;
831 else
832 return -ENOEXEC;
833
834 /* Ok, we can drop one, so let's do so. */
2e81c8a5 835 log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
23a177ef 836 transaction_delete_job(m, d, true);
1ffba6fe
LP		 837 return 0;
838 }
839
840 return -EINVAL;
841}
842
398ef8ba 843static int transaction_merge_jobs(Manager *m, DBusError *e) {
11dd41ce 844 Job *j;
034c6ed7 845 Iterator i;
e5b5ae50
LP		 846 int r;
847
848 assert(m);
849
1ffba6fe
LP		 850 /* First step, check whether any of the jobs for one specific
851 * task conflict. If so, try to drop one of them. */
034c6ed7 852 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1ffba6fe
LP		 853 JobType t;
854 Job *k;
855
856 t = j->type;
034c6ed7 857 LIST_FOREACH(transaction, k, j->transaction_next) {
e364ad06 858 if (job_type_merge(&t, k->type) >= 0)
1ffba6fe
LP		 859 continue;
860
861 /* OK, we could not merge all jobs for this
862 * action. Let's see if we can get rid of one
863 * of them */
864
5cb5a6ff 865 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
1ffba6fe
LP		 866 /* Ok, we managed to drop one, now
867 * let's ask our callers to call us
868 * again after garbage collecting */
869 return -EAGAIN;
870
871 /* We couldn't merge anything. Failure */
398ef8ba
LP		 872 dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
873 job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
1ffba6fe
LP		 874 return r;
875 }
876 }
877
878 /* Second step, merge the jobs. */
034c6ed7 879 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
e5b5ae50
LP		 880 JobType t = j->type;
881 Job *k;
882
e094e853 883 /* Merge all transactions */
034c6ed7 884 LIST_FOREACH(transaction, k, j->transaction_next)
1ffba6fe 885 assert_se(job_type_merge(&t, k->type) == 0);
e5b5ae50 886
5cb5a6ff 887 /* If an active job is mergeable, merge it too */
87f0e418
LP		 888 if (j->unit->meta.job)
889 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
e094e853 890
e5b5ae50 891 while ((k = j->transaction_next)) {
ac1135be 892 if (j->installed) {
7fad411c 893 transaction_merge_and_delete_job(m, k, j, t);
e5b5ae50
LP		 894 j = k;
895 } else
7fad411c 896 transaction_merge_and_delete_job(m, j, k, t);
e5b5ae50
LP		 897 }
898
899 assert(!j->transaction_next);
900 assert(!j->transaction_prev);
901 }
902
7fad411c 903 return 0;
e5b5ae50
LP		 904}
905
23a177ef
LP		 906static void transaction_drop_redundant(Manager *m) {
907 bool again;
908
909 assert(m);
910
911 /* Goes through the transaction and removes all jobs that are
912 * a noop */
913
914 do {
915 Job *j;
916 Iterator i;
917
918 again = false;
919
920 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
921 bool changes_something = false;
922 Job *k;
923
924 LIST_FOREACH(transaction, k, j) {
925
926 if (!job_is_anchor(k) &&
3aea3b35
LP		 927 (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
928 (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
23a177ef
LP		 929 continue;
930
931 changes_something = true;
932 break;
933 }
934
935 if (changes_something)
936 continue;
937
9b3d9090 938 /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
23a177ef
LP		 939 transaction_delete_job(m, j, false);
940 again = true;
941 break;
942 }
943
944 } while (again);
945}
946
87f0e418
LP		 947static bool unit_matters_to_anchor(Unit *u, Job *j) {
948 assert(u);
1ffba6fe
LP		 949 assert(!j->transaction_prev);
950
87f0e418 951 /* Checks whether at least one of the jobs for this unit
1ffba6fe
LP		 952 * matters to the anchor. */
953
034c6ed7 954 LIST_FOREACH(transaction, j, j)
1ffba6fe
LP		 955 if (j->matters_to_anchor)
956 return true;
957
958 return false;
959}
960
398ef8ba 961static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
034c6ed7 962 Iterator i;
87f0e418 963 Unit *u;
11dd41ce 964 int r;
e5b5ae50
LP		 965
966 assert(m);
967 assert(j);
1ffba6fe
LP		 968 assert(!j->transaction_prev);
969
970 /* Does a recursive sweep through the ordering graph, looking
971 * for a cycle. If we find cycle we try to break it. */
e5b5ae50 972
23e3c588
LP		 973 /* Have we seen this before? */
974 if (j->generation == generation) {
674a6e4d 975 Job *k, *delete;
e5b5ae50 976
23e3c588
LP		 977 /* If the marker is NULL we have been here already and
978 * decided the job was loop-free from here. Hence
979 * shortcut things and return right-away. */
980 if (!j->marker)
981 return 0;
e5b5ae50 982
23e3c588
LP		 983 /* So, the marker is not NULL and we already have been
984 * here. We have a cycle. Let's try to break it. We go
985 * backwards in our path and try to find a suitable
986 * job to remove. We use the marker to find our way
987 * back, since smart how we are we stored our way back
988 * in there. */
54165a39 989 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
9f04bd52 990
674a6e4d 991 delete = NULL;
23e3c588 992 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
1ffba6fe 993
54165a39 994 log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
9f04bd52 995
674a6e4d
LP		 996 if (!delete &&
997 !k->installed &&
87f0e418 998 !unit_matters_to_anchor(k->unit, k)) {
1ffba6fe
LP		 999 /* Ok, we can drop this one, so let's
1000 * do so. */
674a6e4d 1001 delete = k;
e5b5ae50
LP		 1002 }
1003
1004 /* Check if this in fact was the beginning of
7fad411c 1005 * the cycle */
e5b5ae50
LP		 1006 if (k == j)
1007 break;
1008 }
1009
674a6e4d
LP		 1010
1011 if (delete) {
54ec68b6 1012 log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
674a6e4d
LP		 1013 transaction_delete_unit(m, delete->unit);
1014 return -EAGAIN;
1015 }
1016
54165a39 1017 log_error("Unable to break cycle");
9f04bd52 1018
fe71c02c 1019 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1ffba6fe 1020 return -ENOEXEC;
e5b5ae50
LP		 1021 }
1022
1ffba6fe 1023 /* Make the marker point to where we come from, so that we can
23e3c588
LP		 1024 * find our way backwards if we want to break a cycle. We use
1025 * a special marker for the beginning: we point to
1026 * ourselves. */
1027 j->marker = from ? from : j;
e5b5ae50
LP		 1028 j->generation = generation;
1029
1ffba6fe 1030 /* We assume that the the dependencies are bidirectional, and
87f0e418
LP		 1031 * hence can ignore UNIT_AFTER */
1032 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
e5b5ae50
LP		 1033 Job *o;
1034
87f0e418
LP		 1035 /* Is there a job for this unit? */
1036 if (!(o = hashmap_get(m->transaction_jobs, u)))
1ffba6fe
LP		 1037
1038 /* Ok, there is no job for this in the
1039 * transaction, but maybe there is already one
1040 * running? */
87f0e418 1041 if (!(o = u->meta.job))
e5b5ae50
LP		 1042 continue;
1043
398ef8ba 1044 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
e5b5ae50
LP		 1045 return r;
1046 }
1047
9f04bd52
LP		 1048 /* Ok, let's backtrack, and remember that this entry is not on
1049 * our path anymore. */
1050 j->marker = NULL;
1051
e5b5ae50
LP		 1052 return 0;
1053}
1054
398ef8ba 1055static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1ffba6fe
LP		 1056 Job *j;
1057 int r;
034c6ed7 1058 Iterator i;
23e3c588 1059 unsigned g;
1ffba6fe 1060
e5b5ae50
LP		 1061 assert(m);
1062 assert(generation);
1063
1ffba6fe
LP		 1064 /* Check if the ordering graph is cyclic. If it is, try to fix
1065 * that up by dropping one of the jobs. */
e5b5ae50 1066
23e3c588
LP		 1067 g = (*generation)++;
1068
034c6ed7 1069 HASHMAP_FOREACH(j, m->transaction_jobs, i)
398ef8ba 1070 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1ffba6fe 1071 return r;
e5b5ae50
LP		 1072
1073 return 0;
1074}
1075
1076static void transaction_collect_garbage(Manager *m) {
1077 bool again;
1078
1079 assert(m);
1080
1ffba6fe
LP		 1081 /* Drop jobs that are not required by any other job */
1082
e5b5ae50 1083 do {
034c6ed7 1084 Iterator i;
e5b5ae50
LP		 1085 Job *j;
1086
1087 again = false;
1088
034c6ed7 1089 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
9b3d9090
LP		 1090 if (j->object_list) {
1091 /* log_debug("Keeping job %s/%s because of %s/%s", */
1092 /* j->unit->meta.id, job_type_to_string(j->type), */
1093 /* j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1094 /* j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
e5b5ae50 1095 continue;
9b3d9090 1096 }
e5b5ae50 1097
9b3d9090 1098 /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
23a177ef 1099 transaction_delete_job(m, j, true);
e5b5ae50
LP		 1100 again = true;
1101 break;
1102 }
1103
1104 } while (again);
1105}
1106
398ef8ba 1107static int transaction_is_destructive(Manager *m, DBusError *e) {
034c6ed7 1108 Iterator i;
e5b5ae50 1109 Job *j;
11dd41ce
LP		 1110
1111 assert(m);
11dd41ce 1112
e5b5ae50
LP		 1113 /* Checks whether applying this transaction means that
1114 * existing jobs would be replaced */
11dd41ce 1115
034c6ed7 1116 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
e094e853
LP		 1117
1118 /* Assume merged */
1119 assert(!j->transaction_prev);
1120 assert(!j->transaction_next);
1121
87f0e418
LP		 1122 if (j->unit->meta.job &&
1123 j->unit->meta.job != j &&
398ef8ba
LP		 1124 !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1125
1126 dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
e5b5ae50 1127 return -EEXIST;
398ef8ba 1128 }
e094e853 1129 }
11dd41ce 1130
e5b5ae50
LP		 1131 return 0;
1132}
1133
e094e853
LP		 1134static void transaction_minimize_impact(Manager *m) {
1135 bool again;
1136 assert(m);
1137
1138 /* Drops all unnecessary jobs that reverse already active jobs
1139 * or that stop a running service. */
1140
1141 do {
1142 Job *j;
034c6ed7 1143 Iterator i;
e094e853
LP		 1144
1145 again = false;
1146
034c6ed7
LP		 1147 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1148 LIST_FOREACH(transaction, j, j) {
c20cae32 1149 bool stops_running_service, changes_existing_job;
e094e853
LP		 1150
1151 /* If it matters, we shouldn't drop it */
1152 if (j->matters_to_anchor)
1153 continue;
1154
1155 /* Would this stop a running service?
1156 * Would this change an existing job?
1157 * If so, let's drop this entry */
c20cae32
LP		 1158
1159 stops_running_service =
1160 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1161
1162 changes_existing_job =
143072ed
LP		 1163 j->unit->meta.job &&
1164 job_type_is_conflicting(j->type, j->unit->meta.job->type);
c20cae32
LP		 1165
1166 if (!stops_running_service && !changes_existing_job)
e094e853
LP		 1167 continue;
1168
c20cae32 1169 if (stops_running_service)
d718bbb5 1170 log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
c20cae32
LP		 1171
1172 if (changes_existing_job)
d718bbb5 1173 log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
c20cae32 1174
e094e853 1175 /* Ok, let's get rid of this */
d718bbb5 1176 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
c20cae32 1177
23a177ef 1178 transaction_delete_job(m, j, true);
e094e853
LP		 1179 again = true;
1180 break;
1181 }
1182
1183 if (again)
1184 break;
1185 }
1186
1187 } while (again);
1188}
1189
4fe60156 1190static int transaction_apply(Manager *m, JobMode mode) {
034c6ed7 1191 Iterator i;
e5b5ae50
LP		 1192 Job *j;
1193 int r;
1194
1ffba6fe
LP		 1195 /* Moves the transaction jobs to the set of active jobs */
1196
4fe60156
LP		 1197 if (mode == JOB_ISOLATE) {
1198
1199 /* When isolating first kill all installed jobs which
1200 * aren't part of the new transaction */
1201 HASHMAP_FOREACH(j, m->jobs, i) {
1202 assert(j->installed);
1203
1204 if (hashmap_get(m->transaction_jobs, j->unit))
1205 continue;
1206
1207 job_finish_and_invalidate(j, JOB_CANCELED);
1208 }
1209 }
1210
034c6ed7 1211 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
e094e853
LP		 1212 /* Assume merged */
1213 assert(!j->transaction_prev);
1214 assert(!j->transaction_next);
1215
ac1135be 1216 if (j->installed)
e5b5ae50
LP		 1217 continue;
1218
1219 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
11dd41ce
LP		 1220 goto rollback;
1221 }
1222
e5b5ae50 1223 while ((j = hashmap_steal_first(m->transaction_jobs))) {
9b3d9090
LP		 1224 if (j->installed) {
1225 /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
e5b5ae50 1226 continue;
9b3d9090 1227 }
e5b5ae50 1228
87f0e418
LP		 1229 if (j->unit->meta.job)
1230 job_free(j->unit->meta.job);
11dd41ce 1231
87f0e418 1232 j->unit->meta.job = j;
ac1135be 1233 j->installed = true;
e409f875 1234 m->n_installed_jobs ++;
11dd41ce 1235
e5b5ae50
LP		 1236 /* We're fully installed. Now let's free data we don't
1237 * need anymore. */
1238
1239 assert(!j->transaction_next);
1240 assert(!j->transaction_prev);
1241
c1e1601e
LP		 1242 job_add_to_run_queue(j);
1243 job_add_to_dbus_queue(j);
312732cf 1244 job_start_timer(j);
28c3247e
LP		 1245
1246 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
01184e04
LP		 1247 }
1248
1249 /* As last step, kill all remaining job dependencies. */
f04fa1d5 1250 transaction_clean_dependencies(m);
1ffba6fe 1251
11dd41ce
LP		 1252 return 0;
1253
1254rollback:
1255
034c6ed7 1256 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
ac1135be 1257 if (j->installed)
e5b5ae50
LP		 1258 continue;
1259
1260 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1261 }
1262
1263 return r;
1264}
1265
398ef8ba 1266static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
e5b5ae50
LP		 1267 int r;
1268 unsigned generation = 1;
1269
1270 assert(m);
1271
1272 /* This applies the changes recorded in transaction_jobs to
1273 * the actual list of jobs, if possible. */
1274
1275 /* First step: figure out which jobs matter */
1276 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1277
e094e853
LP		 1278 /* Second step: Try not to stop any running services if
1279 * we don't have to. Don't try to reverse running
1280 * jobs if we don't have to. */
143072ed 1281 if (mode == JOB_FAIL)
c88e7f4e 1282 transaction_minimize_impact(m);
e094e853 1283
23a177ef
LP		 1284 /* Third step: Drop redundant jobs */
1285 transaction_drop_redundant(m);
1286
1ffba6fe 1287 for (;;) {
23a177ef 1288 /* Fourth step: Let's remove unneeded jobs that might
1ffba6fe 1289 * be lurking. */
a8049b7a
LP		 1290 if (mode != JOB_ISOLATE)
1291 transaction_collect_garbage(m);
e5b5ae50 1292
23a177ef 1293 /* Fifth step: verify order makes sense and correct
1ffba6fe 1294 * cycles if necessary and possible */
398ef8ba 1295 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1ffba6fe 1296 break;
e5b5ae50 1297
9f04bd52 1298 if (r != -EAGAIN) {
398ef8ba 1299 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1ffba6fe 1300 goto rollback;
9f04bd52 1301 }
e5b5ae50 1302
1ffba6fe
LP		 1303 /* Let's see if the resulting transaction ordering
1304 * graph is still cyclic... */
1305 }
1306
1307 for (;;) {
23a177ef 1308 /* Sixth step: let's drop unmergeable entries if
1ffba6fe
LP		 1309 * necessary and possible, merge entries we can
1310 * merge */
398ef8ba 1311 if ((r = transaction_merge_jobs(m, e)) >= 0)
1ffba6fe
LP		 1312 break;
1313
9f04bd52 1314 if (r != -EAGAIN) {
35b8ca3a 1315 log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1ffba6fe 1316 goto rollback;
9f04bd52 1317 }
1ffba6fe 1318
23a177ef 1319 /* Seventh step: an entry got dropped, let's garbage
1ffba6fe 1320 * collect its dependencies. */
a8049b7a
LP		 1321 if (mode != JOB_ISOLATE)
1322 transaction_collect_garbage(m);
1ffba6fe
LP		 1323
1324 /* Let's see if the resulting transaction still has
5cb5a6ff 1325 * unmergeable entries ... */
1ffba6fe
LP		 1326 }
1327
23a177ef
LP		 1328 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1329 transaction_drop_redundant(m);
1330
1331 /* Ninth step: check whether we can actually apply this */
e5b5ae50 1332 if (mode == JOB_FAIL)
398ef8ba
LP		 1333 if ((r = transaction_is_destructive(m, e)) < 0) {
1334 log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
e5b5ae50 1335 goto rollback;
9f04bd52 1336 }
e5b5ae50 1337
23a177ef 1338 /* Tenth step: apply changes */
4fe60156 1339 if ((r = transaction_apply(m, mode)) < 0) {
54165a39 1340 log_warning("Failed to apply transaction: %s", strerror(-r));
e5b5ae50 1341 goto rollback;
9f04bd52 1342 }
e5b5ae50
LP		 1343
1344 assert(hashmap_isempty(m->transaction_jobs));
1345 assert(!m->transaction_anchor);
1346
1347 return 0;
11dd41ce 1348
e5b5ae50 1349rollback:
11dd41ce
LP		 1350 transaction_abort(m);
1351 return r;
1352}
1353
9e2f7c11 1354static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
e5b5ae50 1355 Job *j, *f;
60918275
LP		 1356
1357 assert(m);
87f0e418 1358 assert(unit);
60918275 1359
35b8ca3a 1360 /* Looks for an existing prospective job and returns that. If
e5b5ae50
LP		 1361 * it doesn't exist it is created and added to the prospective
1362 * jobs list. */
60918275 1363
87f0e418 1364 f = hashmap_get(m->transaction_jobs, unit);
60918275 1365
034c6ed7 1366 LIST_FOREACH(transaction, j, f) {
87f0e418 1367 assert(j->unit == unit);
60918275 1368
e5b5ae50
LP		 1369 if (j->type == type) {
1370 if (is_new)
1371 *is_new = false;
1372 return j;
1373 }
1374 }
60918275 1375
87f0e418
LP		 1376 if (unit->meta.job && unit->meta.job->type == type)
1377 j = unit->meta.job;
1378 else if (!(j = job_new(m, type, unit)))
e5b5ae50 1379 return NULL;
60918275 1380
e5b5ae50
LP		 1381 j->generation = 0;
1382 j->marker = NULL;
1383 j->matters_to_anchor = false;
9e2f7c11 1384 j->override = override;
60918275 1385
034c6ed7
LP		 1386 LIST_PREPEND(Job, transaction, f, j);
1387
e364ad06 1388 if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
034c6ed7
LP		 1389 job_free(j);
1390 return NULL;
1391 }
1392
e5b5ae50
LP		 1393 if (is_new)
1394 *is_new = true;
60918275 1395
9b3d9090 1396 /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
23a177ef 1397
e5b5ae50
LP		 1398 return j;
1399}
11dd41ce 1400
23a177ef 1401void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
e5b5ae50
LP		 1402 assert(m);
1403 assert(j);
11dd41ce 1404
e5b5ae50
LP		 1405 if (j->transaction_prev)
1406 j->transaction_prev->transaction_next = j->transaction_next;
1407 else if (j->transaction_next)
87f0e418 1408 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
e5b5ae50 1409 else
87f0e418 1410 hashmap_remove_value(m->transaction_jobs, j->unit, j);
e5b5ae50
LP		 1411
1412 if (j->transaction_next)
1413 j->transaction_next->transaction_prev = j->transaction_prev;
1414
1415 j->transaction_prev = j->transaction_next = NULL;
1416
1417 while (j->subject_list)
1418 job_dependency_free(j->subject_list);
1e198baf
LP		 1419
1420 while (j->object_list) {
1421 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1422
e5b5ae50 1423 job_dependency_free(j->object_list);
1e198baf 1424
23a177ef 1425 if (other && delete_dependencies) {
2e81c8a5 1426 log_debug("Deleting job %s/%s as dependency of job %s/%s",
9e2f7c11
LP		 1427 other->unit->meta.id, job_type_to_string(other->type),
1428 j->unit->meta.id, job_type_to_string(j->type));
23a177ef 1429 transaction_delete_job(m, other, delete_dependencies);
1e198baf
LP		 1430 }
1431 }
e5b5ae50
LP		 1432}
1433
9e2f7c11
LP		 1434static int transaction_add_job_and_dependencies(
1435 Manager *m,
1436 JobType type,
1437 Unit *unit,
1438 Job *by,
1439 bool matters,
1440 bool override,
69dd2852 1441 bool conflicts,
cebe0d41
LP		 1442 bool ignore_requirements,
1443 bool ignore_order,
398ef8ba 1444 DBusError *e,
9e2f7c11 1445 Job **_ret) {
e5b5ae50 1446 Job *ret;
034c6ed7 1447 Iterator i;
87f0e418 1448 Unit *dep;
e5b5ae50
LP		 1449 int r;
1450 bool is_new;
1451
1452 assert(m);
1453 assert(type < _JOB_TYPE_MAX);
87f0e418 1454 assert(unit);
e5b5ae50 1455
3aea3b35
LP		 1456 /* log_debug("Pulling in %s/%s from %s/%s", */
1457 /* unit->meta.id, job_type_to_string(type), */
1458 /* by ? by->unit->meta.id : "NA", */
1459 /* by ? job_type_to_string(by->type) : "NA"); */
1460
00dc5d76
LP		 1461 if (unit->meta.load_state != UNIT_LOADED &&
1462 unit->meta.load_state != UNIT_ERROR &&
6daf4f90 1463 unit->meta.load_state != UNIT_MASKED) {
8821a00f
LP		 1464 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1465 return -EINVAL;
1466 }
1467
fdf20a31 1468 if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
00dc5d76
LP		 1469 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1470 "Unit %s failed to load: %s. "
da8f9f8c 1471 "See system logs and 'systemctl status' for details.",
8821a00f
LP		 1472 unit->meta.id,
1473 strerror(-unit->meta.load_error));
21b293e8 1474 return -EINVAL;
398ef8ba 1475 }
21b293e8 1476
6daf4f90
LP		 1477 if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1478 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
00dc5d76
LP		 1479 return -EINVAL;
1480 }
1481
398ef8ba
LP		 1482 if (!unit_job_is_applicable(unit, type)) {
1483 dbus_set_error(e, BUS_ERROR_JOB_TYPE_NOT_APPLICABLE, "Job type %s is not applicable for unit %s.", job_type_to_string(type), unit->meta.id);
cd2dbd7d 1484 return -EBADR;
398ef8ba 1485 }
cd2dbd7d 1486
e5b5ae50 1487 /* First add the job. */
9e2f7c11 1488 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
e5b5ae50
LP		 1489 return -ENOMEM;
1490
cebe0d41 1491 ret->ignore_order = ret->ignore_order || ignore_order;
e67c3609 1492
e5b5ae50 1493 /* Then, add a link to the job. */
69dd2852 1494 if (!job_dependency_new(by, ret, matters, conflicts))
e5b5ae50
LP		 1495 return -ENOMEM;
1496
cebe0d41 1497 if (is_new && !ignore_requirements) {
6210e7fc
LP		 1498 Set *following;
1499
1500 /* If we are following some other unit, make sure we
1501 * add all dependencies of everybody following. */
1502 if (unit_following_set(ret->unit, &following) > 0) {
1503 SET_FOREACH(dep, following, i)
cebe0d41 1504 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
6210e7fc
LP		 1505 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1506
1507 if (e)
1508 dbus_error_free(e);
1509 }
1510
1511 set_free(following);
1512 }
1513
e5b5ae50
LP		 1514 /* Finally, recursively add in all dependencies. */
1515 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
87f0e418 1516 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
cebe0d41 1517 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
41242c42
LP		 1518 if (r != -EBADR)
1519 goto fail;
1520
1521 if (e)
1522 dbus_error_free(e);
1523 }
9e2f7c11 1524
b81884e7 1525 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
cebe0d41 1526 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
41242c42
LP		 1527
1528 if (r != -EBADR)
1529 goto fail;
1530
1531 if (e)
1532 dbus_error_free(e);
1533 }
b81884e7 1534
9e2f7c11 1535 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
cebe0d41 1536 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
65e92d67 1537 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
60dc72b5
LP		 1538
1539 if (e)
1540 dbus_error_free(e);
65e92d67 1541 }
9e2f7c11 1542
87f0e418 1543 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
cebe0d41 1544 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
65e92d67 1545 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
60dc72b5
LP		 1546
1547 if (e)
1548 dbus_error_free(e);
65e92d67 1549 }
9e2f7c11 1550
87f0e418 1551 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
cebe0d41 1552 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
41242c42
LP		 1553
1554 if (r != -EBADR)
1555 goto fail;
1556
1557 if (e)
1558 dbus_error_free(e);
1559 }
9e2f7c11
LP		 1560
1561 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
cebe0d41 1562 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
65e92d67 1563 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
60dc72b5
LP		 1564
1565 if (e)
1566 dbus_error_free(e);
65e92d67 1567 }
9e2f7c11 1568
87f0e418 1569 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
cebe0d41 1570 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e, NULL)) < 0) {
41242c42
LP		 1571
1572 if (r != -EBADR)
1573 goto fail;
1574
1575 if (e)
1576 dbus_error_free(e);
1577 }
69dd2852
LP		 1578
1579 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
cebe0d41 1580 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
41242c42
LP		 1581 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1582
1583 if (e)
1584 dbus_error_free(e);
1585 }
e5b5ae50
LP		 1586
1587 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1588
87f0e418 1589 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
cebe0d41 1590 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
41242c42
LP		 1591
1592 if (r != -EBADR)
1593 goto fail;
1594
1595 if (e)
1596 dbus_error_free(e);
1597 }
b81884e7
LP		 1598
1599 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
cebe0d41 1600 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
41242c42
LP		 1601
1602 if (r != -EBADR)
1603 goto fail;
1604
1605 if (e)
1606 dbus_error_free(e);
1607 }
e5b5ae50
LP		 1608 }
1609
1610 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1611 }
60918275 1612
c0dafa48
LP		 1613 if (_ret)
1614 *_ret = ret;
1615
60918275
LP		 1616 return 0;
1617
1618fail:
e5b5ae50
LP		 1619 return r;
1620}
1621
c497c7a9
LP		 1622static int transaction_add_isolate_jobs(Manager *m) {
1623 Iterator i;
1624 Unit *u;
1625 char *k;
1626 int r;
1627
1628 assert(m);
1629
1630 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1631
1632 /* ignore aliases */
1633 if (u->meta.id != k)
1634 continue;
1635
c8f4d764 1636 if (u->meta.ignore_on_isolate)
c497c7a9
LP		 1637 continue;
1638
1639 /* No need to stop inactive jobs */
2ce5c8f9 1640 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
c497c7a9
LP		 1641 continue;
1642
1643 /* Is there already something listed for this? */
1644 if (hashmap_get(m->transaction_jobs, u))
1645 continue;
1646
cebe0d41 1647 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
c497c7a9
LP		 1648 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1649 }
1650
1651 return 0;
1652}
1653
398ef8ba 1654int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
e5b5ae50
LP		 1655 int r;
1656 Job *ret;
1657
1658 assert(m);
1659 assert(type < _JOB_TYPE_MAX);
87f0e418 1660 assert(unit);
e5b5ae50 1661 assert(mode < _JOB_MODE_MAX);
60918275 1662
398ef8ba
LP		 1663 if (mode == JOB_ISOLATE && type != JOB_START) {
1664 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
c497c7a9 1665 return -EINVAL;
398ef8ba 1666 }
c497c7a9 1667
2528a7a6
LP		 1668 if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1669 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1670 return -EPERM;
1671 }
1672
e43ac878 1673 log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
9f04bd52 1674
cebe0d41
LP		 1675 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
1676 mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1677 mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
11dd41ce 1678 transaction_abort(m);
e5b5ae50
LP		 1679 return r;
1680 }
11dd41ce 1681
c497c7a9
LP		 1682 if (mode == JOB_ISOLATE)
1683 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1684 transaction_abort(m);
1685 return r;
1686 }
1687
398ef8ba 1688 if ((r = transaction_activate(m, mode, e)) < 0)
e5b5ae50
LP		 1689 return r;
1690
9e2f7c11 1691 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
f50e0a01 1692
e5b5ae50
LP		 1693 if (_ret)
1694 *_ret = ret;
60918275 1695
e5b5ae50
LP		 1696 return 0;
1697}
60918275 1698
398ef8ba 1699int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
28247076
LP		 1700 Unit *unit;
1701 int r;
1702
1703 assert(m);
1704 assert(type < _JOB_TYPE_MAX);
1705 assert(name);
1706 assert(mode < _JOB_MODE_MAX);
1707
398ef8ba 1708 if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
28247076
LP		 1709 return r;
1710
398ef8ba 1711 return manager_add_job(m, type, unit, mode, override, e, _ret);
28247076
LP		 1712}
1713
60918275
LP		 1714Job *manager_get_job(Manager *m, uint32_t id) {
1715 assert(m);
1716
1717 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1718}
1719
87f0e418 1720Unit *manager_get_unit(Manager *m, const char *name) {
60918275
LP		 1721 assert(m);
1722 assert(name);
1723
87f0e418 1724 return hashmap_get(m->units, name);
60918275
LP		 1725}
1726
c1e1601e 1727unsigned manager_dispatch_load_queue(Manager *m) {
60918275 1728 Meta *meta;
c1e1601e 1729 unsigned n = 0;
60918275
LP		 1730
1731 assert(m);
1732
223dabab
LP		 1733 /* Make sure we are not run recursively */
1734 if (m->dispatching_load_queue)
c1e1601e 1735 return 0;
223dabab
LP		 1736
1737 m->dispatching_load_queue = true;
1738
87f0e418 1739 /* Dispatches the load queue. Takes a unit from the queue and
60918275
LP		 1740 * tries to load its data until the queue is empty */
1741
1742 while ((meta = m->load_queue)) {
034c6ed7
LP		 1743 assert(meta->in_load_queue);
1744
399ab2b1 1745 unit_load((Unit*) meta);
c1e1601e 1746 n++;
60918275
LP		 1747 }
1748
223dabab 1749 m->dispatching_load_queue = false;
c1e1601e 1750 return n;
60918275
LP		 1751}
1752
398ef8ba 1753int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
87f0e418 1754 Unit *ret;
60918275
LP		 1755 int r;
1756
1757 assert(m);
9e2f7c11 1758 assert(name || path);
60918275 1759
db06e3b6
LP		 1760 /* This will prepare the unit for loading, but not actually
1761 * load anything from disk. */
0301abf4 1762
398ef8ba
LP		 1763 if (path && !is_path(path)) {
1764 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
9e2f7c11 1765 return -EINVAL;
398ef8ba 1766 }
9e2f7c11
LP		 1767
1768 if (!name)
1769 name = file_name_from_path(path);
1770
b9c0d441 1771 if (!unit_name_is_valid(name, false)) {
398ef8ba 1772 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
9e2f7c11 1773 return -EINVAL;
398ef8ba 1774 }
60918275 1775
87f0e418 1776 if ((ret = manager_get_unit(m, name))) {
034c6ed7 1777 *_ret = ret;
413d6313 1778 return 1;
034c6ed7 1779 }
60918275 1780
87f0e418 1781 if (!(ret = unit_new(m)))
60918275
LP		 1782 return -ENOMEM;
1783
9e2f7c11 1784 if (path)
6be1e7d5 1785 if (!(ret->meta.fragment_path = strdup(path))) {
0301abf4
LP		 1786 unit_free(ret);
1787 return -ENOMEM;
1788 }
0301abf4 1789
87f0e418
LP		 1790 if ((r = unit_add_name(ret, name)) < 0) {
1791 unit_free(ret);
1ffba6fe 1792 return r;
60918275
LP		 1793 }
1794
87f0e418 1795 unit_add_to_load_queue(ret);
c1e1601e 1796 unit_add_to_dbus_queue(ret);
949061f0 1797 unit_add_to_gc_queue(ret);
c1e1601e 1798
db06e3b6
LP		 1799 if (_ret)
1800 *_ret = ret;
1801
1802 return 0;
1803}
1804
398ef8ba 1805int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
db06e3b6
LP		 1806 int r;
1807
1808 assert(m);
1809
1810 /* This will load the service information files, but not actually
1811 * start any services or anything. */
1812
398ef8ba 1813 if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
db06e3b6
LP		 1814 return r;
1815
f50e0a01 1816 manager_dispatch_load_queue(m);
60918275 1817
9e2f7c11 1818 if (_ret)
413d6313 1819 *_ret = unit_follow_merge(*_ret);
9e2f7c11 1820
60918275
LP		 1821 return 0;
1822}
a66d02c3 1823
cea8e32e 1824void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
034c6ed7 1825 Iterator i;
a66d02c3
LP		 1826 Job *j;
1827
1828 assert(s);
1829 assert(f);
1830
034c6ed7 1831 HASHMAP_FOREACH(j, s->jobs, i)
cea8e32e 1832 job_dump(j, f, prefix);
a66d02c3
LP		 1833}
1834
87f0e418 1835void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
034c6ed7 1836 Iterator i;
87f0e418 1837 Unit *u;
11dd41ce 1838 const char *t;
a66d02c3
LP		 1839
1840 assert(s);
1841 assert(f);
1842
87f0e418 1843 HASHMAP_FOREACH_KEY(u, t, s->units, i)
9e2f7c11 1844 if (u->meta.id == t)
87f0e418 1845 unit_dump(u, f, prefix);
a66d02c3 1846}
7fad411c
LP		 1847
1848void manager_clear_jobs(Manager *m) {
1849 Job *j;
1850
1851 assert(m);
1852
1853 transaction_abort(m);
1854
1855 while ((j = hashmap_first(m->jobs)))
c77bc38d 1856 job_finish_and_invalidate(j, JOB_CANCELED);
7fad411c 1857}
83c60c9f 1858
c1e1601e 1859unsigned manager_dispatch_run_queue(Manager *m) {
83c60c9f 1860 Job *j;
c1e1601e 1861 unsigned n = 0;
83c60c9f 1862
034c6ed7 1863 if (m->dispatching_run_queue)
c1e1601e 1864 return 0;
034c6ed7
LP		 1865
1866 m->dispatching_run_queue = true;
9152c765 1867
034c6ed7 1868 while ((j = m->run_queue)) {
ac1135be 1869 assert(j->installed);
034c6ed7
LP		 1870 assert(j->in_run_queue);
1871
1872 job_run_and_invalidate(j);
c1e1601e 1873 n++;
9152c765 1874 }
034c6ed7
LP		 1875
1876 m->dispatching_run_queue = false;
c1e1601e
LP		 1877 return n;
1878}
1879
1880unsigned manager_dispatch_dbus_queue(Manager *m) {
1881 Job *j;
1882 Meta *meta;
1883 unsigned n = 0;
1884
1885 assert(m);
1886
1887 if (m->dispatching_dbus_queue)
1888 return 0;
1889
1890 m->dispatching_dbus_queue = true;
1891
1892 while ((meta = m->dbus_unit_queue)) {
23a177ef 1893 assert(meta->in_dbus_queue);
c1e1601e 1894
399ab2b1 1895 bus_unit_send_change_signal((Unit*) meta);
c1e1601e
LP		 1896 n++;
1897 }
1898
1899 while ((j = m->dbus_job_queue)) {
1900 assert(j->in_dbus_queue);
1901
1902 bus_job_send_change_signal(j);
1903 n++;
1904 }
1905
1906 m->dispatching_dbus_queue = false;
1907 return n;
9152c765
LP		 1908}
1909
8c47c732
LP		 1910static int manager_process_notify_fd(Manager *m) {
1911 ssize_t n;
1912
1913 assert(m);
1914
1915 for (;;) {
1916 char buf[4096];
1917 struct msghdr msghdr;
1918 struct iovec iovec;
1919 struct ucred *ucred;
1920 union {
1921 struct cmsghdr cmsghdr;
1922 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1923 } control;
1924 Unit *u;
1925 char **tags;
1926
1927 zero(iovec);
1928 iovec.iov_base = buf;
1929 iovec.iov_len = sizeof(buf)-1;
1930
1931 zero(control);
1932 zero(msghdr);
1933 msghdr.msg_iov = &iovec;
1934 msghdr.msg_iovlen = 1;
1935 msghdr.msg_control = &control;
1936 msghdr.msg_controllen = sizeof(control);
1937
1938 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1939 if (n >= 0)
1940 return -EIO;
1941
f6144808 1942 if (errno == EAGAIN || errno == EINTR)
8c47c732
LP		 1943 break;
1944
1945 return -errno;
1946 }
1947
1948 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1949 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1950 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1951 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1952 log_warning("Received notify message without credentials. Ignoring.");
1953 continue;
1954 }
1955
1956 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1957
c6c18be3 1958 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
8c47c732
LP		 1959 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1960 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1961 continue;
1962 }
1963
8c40acf7
LP		 1964 assert((size_t) n < sizeof(buf));
1965 buf[n] = 0;
8c47c732
LP		 1966 if (!(tags = strv_split(buf, "\n\r")))
1967 return -ENOMEM;
1968
1969 log_debug("Got notification message for unit %s", u->meta.id);
1970
1971 if (UNIT_VTABLE(u)->notify_message)
c952c6ec 1972 UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
8c47c732
LP		 1973
1974 strv_free(tags);
1975 }
1976
1977 return 0;
1978}
1979
034c6ed7 1980static int manager_dispatch_sigchld(Manager *m) {
9152c765
LP		 1981 assert(m);
1982
1983 for (;;) {
1984 siginfo_t si;
87f0e418 1985 Unit *u;
8c47c732 1986 int r;
9152c765
LP		 1987
1988 zero(si);
4112df16
LP		 1989
1990 /* First we call waitd() for a PID and do not reap the
1991 * zombie. That way we can still access /proc/$PID for
1992 * it while it is a zombie. */
1993 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
acbb0225
LP		 1994
1995 if (errno == ECHILD)
1996 break;
1997
4112df16
LP		 1998 if (errno == EINTR)
1999 continue;
2000
9152c765 2001 return -errno;
acbb0225 2002 }
9152c765 2003
4112df16 2004 if (si.si_pid <= 0)
9152c765
LP		 2005 break;
2006
15d5d9d9 2007 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
4112df16
LP		 2008 char *name = NULL;
2009
2010 get_process_name(si.si_pid, &name);
bb00e604 2011 log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
4112df16
LP		 2012 free(name);
2013 }
2014
8c47c732
LP		 2015 /* Let's flush any message the dying child might still
2016 * have queued for us. This ensures that the process
2017 * still exists in /proc so that we can figure out
2018 * which cgroup and hence unit it belongs to. */
2019 if ((r = manager_process_notify_fd(m)) < 0)
2020 return r;
2021
2022 /* And now figure out the unit this belongs to */
c6c18be3 2023 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
8c47c732
LP		 2024 u = cgroup_unit_by_pid(m, si.si_pid);
2025
4112df16
LP		 2026 /* And now, we actually reap the zombie. */
2027 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2028 if (errno == EINTR)
2029 continue;
2030
2031 return -errno;
2032 }
2033
034c6ed7
LP		 2034 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2035 continue;
2036
bb00e604
LP		 2037 log_debug("Child %lu died (code=%s, status=%i/%s)",
2038 (long unsigned) si.si_pid,
4112df16
LP		 2039 sigchld_code_to_string(si.si_code),
2040 si.si_status,
d06dacd0
LP		 2041 strna(si.si_code == CLD_EXITED
2042 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2043 : signal_to_string(si.si_status)));
acbb0225 2044
8c47c732 2045 if (!u)
9152c765
LP		 2046 continue;
2047
c6c18be3 2048 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
6c1a0478 2049
c6c18be3 2050 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
87f0e418 2051 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
9152c765
LP		 2052 }
2053
2054 return 0;
2055}
2056
7d793605 2057static int manager_start_target(Manager *m, const char *name, JobMode mode) {
28247076 2058 int r;
398ef8ba
LP		 2059 DBusError error;
2060
2061 dbus_error_init(&error);
2062
af2d49f7 2063 log_debug("Activating special unit %s", name);
1e001f52 2064
398ef8ba
LP		 2065 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2066 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
28247076 2067
398ef8ba 2068 dbus_error_free(&error);
a1b256b0
LP		 2069
2070 return r;
28247076
LP		 2071}
2072
a16e1123 2073static int manager_process_signal_fd(Manager *m) {
9152c765
LP		 2074 ssize_t n;
2075 struct signalfd_siginfo sfsi;
2076 bool sigchld = false;
2077
2078 assert(m);
2079
2080 for (;;) {
acbb0225 2081 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
9152c765
LP		 2082
2083 if (n >= 0)
2084 return -EIO;
2085
63090775 2086 if (errno == EINTR || errno == EAGAIN)
acbb0225 2087 break;
9152c765
LP		 2088
2089 return -errno;
2090 }
2091
67370238
LP		 2092 if (sfsi.ssi_pid > 0) {
2093 char *p = NULL;
2094
dfa7f7e1
LP		 2095 get_process_name(sfsi.ssi_pid, &p);
2096
67370238
LP		 2097 log_debug("Received SIG%s from PID %lu (%s).",
2098 strna(signal_to_string(sfsi.ssi_signo)),
2099 (unsigned long) sfsi.ssi_pid, strna(p));
2100 free(p);
2101 } else
2102 log_debug("Received SIG%s.", strna(signal_to_string(sfsi.ssi_signo)));
1e001f52 2103
b9cd2ec1
LP		 2104 switch (sfsi.ssi_signo) {
2105
4112df16 2106 case SIGCHLD:
9152c765 2107 sigchld = true;
b9cd2ec1
LP		 2108 break;
2109
6632c602 2110 case SIGTERM:
a3d4e06d 2111 if (m->running_as == MANAGER_SYSTEM) {
db06e3b6
LP		 2112 /* This is for compatibility with the
2113 * original sysvinit */
e11dc4a2 2114 m->exit_code = MANAGER_REEXECUTE;
a1b256b0
LP		 2115 break;
2116 }
84e9af1e 2117
a1b256b0 2118 /* Fall through */
e11dc4a2
LP		 2119
2120 case SIGINT:
a3d4e06d 2121 if (m->running_as == MANAGER_SYSTEM) {
7d793605 2122 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
84e9af1e
LP		 2123 break;
2124 }
2125
a1b256b0 2126 /* Run the exit target if there is one, if not, just exit. */
0003d1ab 2127 if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
a1b256b0
LP		 2128 m->exit_code = MANAGER_EXIT;
2129 return 0;
2130 }
2131
2132 break;
84e9af1e 2133
28247076 2134 case SIGWINCH:
a3d4e06d 2135 if (m->running_as == MANAGER_SYSTEM)
7d793605 2136 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
84e9af1e 2137
28247076
LP		 2138 /* This is a nop on non-init */
2139 break;
84e9af1e 2140
28247076 2141 case SIGPWR:
a3d4e06d 2142 if (m->running_as == MANAGER_SYSTEM)
7d793605 2143 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
84e9af1e 2144
28247076 2145 /* This is a nop on non-init */
84e9af1e 2146 break;
6632c602 2147
1005d14f 2148 case SIGUSR1: {
57ee42ce
LP		 2149 Unit *u;
2150
2151 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2152
2153 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2154 log_info("Trying to reconnect to bus...");
3996fbe2 2155 bus_init(m, true);
57ee42ce
LP		 2156 }
2157
2158 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2159 log_info("Loading D-Bus service...");
7d793605 2160 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
57ee42ce
LP		 2161 }
2162
2163 break;
2164 }
2165
2149e37c
LP		 2166 case SIGUSR2: {
2167 FILE *f;
2168 char *dump = NULL;
2169 size_t size;
2170
2171 if (!(f = open_memstream(&dump, &size))) {
2172 log_warning("Failed to allocate memory stream.");
2173 break;
2174 }
2175
2176 manager_dump_units(m, f, "\t");
2177 manager_dump_jobs(m, f, "\t");
2178
2179 if (ferror(f)) {
2180 fclose(f);
2181 free(dump);
2182 log_warning("Failed to write status stream");
2183 break;
2184 }
2185
2186 fclose(f);
2187 log_dump(LOG_INFO, dump);
2188 free(dump);
2189
1005d14f 2190 break;
2149e37c 2191 }
1005d14f 2192
a16e1123
LP		 2193 case SIGHUP:
2194 m->exit_code = MANAGER_RELOAD;
2195 break;
2196
7d793605 2197 default: {
0003d1ab
LP		 2198 /* Starting SIGRTMIN+0 */
2199 static const char * const target_table[] = {
7d793605
LP		 2200 [0] = SPECIAL_DEFAULT_TARGET,
2201 [1] = SPECIAL_RESCUE_TARGET,
f057408c 2202 [2] = SPECIAL_EMERGENCY_TARGET,
7d793605
LP		 2203 [3] = SPECIAL_HALT_TARGET,
2204 [4] = SPECIAL_POWEROFF_TARGET,
0003d1ab
LP		 2205 [5] = SPECIAL_REBOOT_TARGET,
2206 [6] = SPECIAL_KEXEC_TARGET
2207 };
2208
2209 /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2210 static const ManagerExitCode code_table[] = {
2211 [0] = MANAGER_HALT,
2212 [1] = MANAGER_POWEROFF,
2213 [2] = MANAGER_REBOOT,
2214 [3] = MANAGER_KEXEC
7d793605
LP		 2215 };
2216
2217 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
0003d1ab
LP		 2218 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2219 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
e6b3f00f 2220 (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
7d793605
LP		 2221 break;
2222 }
2223
0003d1ab
LP		 2224 if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2225 (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2226 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2227 break;
2228 }
2229
0658666b
LP		 2230 switch (sfsi.ssi_signo - SIGRTMIN) {
2231
2232 case 20:
2233 log_debug("Enabling showing of status.");
2234 m->show_status = true;
2235 break;
2236
2237 case 21:
2238 log_debug("Disabling showing of status.");
2239 m->show_status = false;
2240 break;
2241
2242 default:
2243 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2244 }
b9cd2ec1 2245 }
7d793605 2246 }
9152c765
LP		 2247 }
2248
2249 if (sigchld)
034c6ed7
LP		 2250 return manager_dispatch_sigchld(m);
2251
2252 return 0;
2253}
2254
a16e1123 2255static int process_event(Manager *m, struct epoll_event *ev) {
034c6ed7 2256 int r;
acbb0225 2257 Watch *w;
034c6ed7
LP		 2258
2259 assert(m);
2260 assert(ev);
2261
acbb0225 2262 assert(w = ev->data.ptr);
034c6ed7 2263
40dde66f
LP		 2264 if (w->type == WATCH_INVALID)
2265 return 0;
2266
acbb0225 2267 switch (w->type) {
034c6ed7 2268
ef734fd6 2269 case WATCH_SIGNAL:
034c6ed7 2270
acbb0225 2271 /* An incoming signal? */
f94ea366 2272 if (ev->events != EPOLLIN)
acbb0225 2273 return -EINVAL;
034c6ed7 2274
a16e1123 2275 if ((r = manager_process_signal_fd(m)) < 0)
acbb0225 2276 return r;
034c6ed7 2277
acbb0225 2278 break;
034c6ed7 2279
8c47c732
LP		 2280 case WATCH_NOTIFY:
2281
2282 /* An incoming daemon notification event? */
2283 if (ev->events != EPOLLIN)
2284 return -EINVAL;
2285
2286 if ((r = manager_process_notify_fd(m)) < 0)
2287 return r;
2288
2289 break;
2290
acbb0225 2291 case WATCH_FD:
034c6ed7 2292
acbb0225 2293 /* Some fd event, to be dispatched to the units */
ea430986 2294 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
acbb0225 2295 break;
034c6ed7 2296
faf919f1
LP		 2297 case WATCH_UNIT_TIMER:
2298 case WATCH_JOB_TIMER: {
acbb0225
LP		 2299 uint64_t v;
2300 ssize_t k;
034c6ed7 2301
acbb0225 2302 /* Some timer event, to be dispatched to the units */
be888ebb 2303 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
034c6ed7 2304
acbb0225
LP		 2305 if (k < 0 && (errno == EINTR || errno == EAGAIN))
2306 break;
034c6ed7 2307
acbb0225 2308 return k < 0 ? -errno : -EIO;
034c6ed7
LP		 2309 }
2310
faf919f1
LP		 2311 if (w->type == WATCH_UNIT_TIMER)
2312 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2313 else
2314 job_timer_event(w->data.job, v, w);
acbb0225
LP		 2315 break;
2316 }
2317
ef734fd6
LP		 2318 case WATCH_MOUNT:
2319 /* Some mount table change, intended for the mount subsystem */
2320 mount_fd_event(m, ev->events);
2321 break;
2322
4e434314
LP		 2323 case WATCH_SWAP:
2324 /* Some swap table change, intended for the swap subsystem */
2325 swap_fd_event(m, ev->events);
2326 break;
2327
f94ea366
LP		 2328 case WATCH_UDEV:
2329 /* Some notification from udev, intended for the device subsystem */
2330 device_fd_event(m, ev->events);
2331 break;
2332
ea430986
LP		 2333 case WATCH_DBUS_WATCH:
2334 bus_watch_event(m, w, ev->events);
2335 break;
2336
2337 case WATCH_DBUS_TIMEOUT:
2338 bus_timeout_event(m, w, ev->events);
2339 break;
2340
acbb0225 2341 default:
c5fd1e57 2342 log_error("event type=%i", w->type);
acbb0225 2343 assert_not_reached("Unknown epoll event type.");
034c6ed7 2344 }
9152c765
LP		 2345
2346 return 0;
2347}
2348
2349int manager_loop(Manager *m) {
2350 int r;
9152c765 2351
fac9f8df 2352 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
ea430986 2353
9152c765 2354 assert(m);
a16e1123 2355 m->exit_code = MANAGER_RUNNING;
9152c765 2356
fe51822e
LP		 2357 /* Release the path cache */
2358 set_free_free(m->unit_path_cache);
2359 m->unit_path_cache = NULL;
2360
b0c918b9
LP		 2361 manager_check_finished(m);
2362
a4312405
LP		 2363 /* There might still be some zombies hanging around from
2364 * before we were exec()'ed. Leat's reap them */
2365 if ((r = manager_dispatch_sigchld(m)) < 0)
2366 return r;
2367
a16e1123 2368 while (m->exit_code == MANAGER_RUNNING) {
957ca890
LP		 2369 struct epoll_event event;
2370 int n;
9152c765 2371
ea430986
LP		 2372 if (!ratelimit_test(&rl)) {
2373 /* Yay, something is going seriously wrong, pause a little */
2374 log_warning("Looping too fast. Throttling execution a little.");
2375 sleep(1);
2376 }
2377
37a8e683 2378 if (manager_dispatch_load_queue(m) > 0)
23a177ef
LP		 2379 continue;
2380
37a8e683 2381 if (manager_dispatch_run_queue(m) > 0)
701cc384
LP		 2382 continue;
2383
37a8e683 2384 if (bus_dispatch(m) > 0)
c1e1601e 2385 continue;
034c6ed7 2386
37a8e683 2387 if (manager_dispatch_cleanup_queue(m) > 0)
c1e1601e
LP		 2388 continue;
2389
37a8e683 2390 if (manager_dispatch_gc_queue(m) > 0)
c1e1601e
LP		 2391 continue;
2392
2393 if (manager_dispatch_dbus_queue(m) > 0)
ea430986 2394 continue;
ea430986 2395
e04aad61
LP		 2396 if (swap_dispatch_reload(m) > 0)
2397 continue;
2398
957ca890 2399 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
9152c765 2400
6089f4a9 2401 if (errno == EINTR)
9152c765
LP		 2402 continue;
2403
2404 return -errno;
2405 }
2406
957ca890 2407 assert(n == 1);
b9cd2ec1 2408
a16e1123 2409 if ((r = process_event(m, &event)) < 0)
957ca890 2410 return r;
a16e1123 2411 }
957ca890 2412
a16e1123 2413 return m->exit_code;
83c60c9f 2414}
ea430986
LP		 2415
2416int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2417 char *n;
2418 Unit *u;
2419
2420 assert(m);
2421 assert(s);
2422 assert(_u);
2423
2424 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2425 return -EINVAL;
2426
2427 if (!(n = bus_path_unescape(s+31)))
2428 return -ENOMEM;
2429
2430 u = manager_get_unit(m, n);
2431 free(n);
2432
2433 if (!u)
2434 return -ENOENT;
2435
2436 *_u = u;
2437
2438 return 0;
2439}
86fbf370
LP		 2440
2441int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2442 Job *j;
2443 unsigned id;
2444 int r;
2445
2446 assert(m);
2447 assert(s);
2448 assert(_j);
2449
2450 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2451 return -EINVAL;
2452
2453 if ((r = safe_atou(s + 30, &id)) < 0)
2454 return r;
2455
2456 if (!(j = manager_get_job(m, id)))
2457 return -ENOENT;
2458
2459 *_j = j;
2460
2461 return 0;
2462}
dfcd764e 2463
4927fcae 2464void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
e537352b 2465
4927fcae
LP		 2466#ifdef HAVE_AUDIT
2467 char *p;
e537352b 2468
4927fcae 2469 if (m->audit_fd < 0)
e537352b
LP		 2470 return;
2471
bbd3a7ba
LP		 2472 /* Don't generate audit events if the service was already
2473 * started and we're just deserializing */
2474 if (m->n_deserializing > 0)
2475 return;
2476
f1dd0c3f
LP		 2477 if (m->running_as != MANAGER_SYSTEM)
2478 return;
2479
2480 if (u->meta.type != UNIT_SERVICE)
2481 return;
2482
4927fcae
LP		 2483 if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2484 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
e537352b
LP		 2485 return;
2486 }
2487
391ade86
LP		 2488 if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
2489 log_warning("Failed to send audit message: %m");
2490
2491 if (errno == EPERM) {
2492 /* We aren't allowed to send audit messages?
2493 * Then let's not retry again, to avoid
2494 * spamming the user with the same and same
2495 * messages over and over. */
2496
2497 audit_close(m->audit_fd);
2498 m->audit_fd = -1;
2499 }
2500 }
e537352b 2501
4927fcae
LP		 2502 free(p);
2503#endif
e537352b 2504
e537352b
LP		 2505}
2506
e983b760
LP		 2507void manager_send_unit_plymouth(Manager *m, Unit *u) {
2508 int fd = -1;
2509 union sockaddr_union sa;
2510 int n = 0;
2511 char *message = NULL;
e983b760
LP		 2512
2513 /* Don't generate plymouth events if the service was already
2514 * started and we're just deserializing */
2515 if (m->n_deserializing > 0)
2516 return;
2517
2518 if (m->running_as != MANAGER_SYSTEM)
2519 return;
2520
2521 if (u->meta.type != UNIT_SERVICE &&
2522 u->meta.type != UNIT_MOUNT &&
2523 u->meta.type != UNIT_SWAP)
2524 return;
2525
2526 /* We set SOCK_NONBLOCK here so that we rather drop the
2527 * message then wait for plymouth */
2528 if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2529 log_error("socket() failed: %m");
2530 return;
2531 }
2532
2533 zero(sa);
2534 sa.sa.sa_family = AF_UNIX;
96707269
LP		 2535 strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2536 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
e983b760
LP		 2537
2538 if (errno != EPIPE &&
2539 errno != EAGAIN &&
2540 errno != ENOENT &&
2541 errno != ECONNREFUSED &&
2542 errno != ECONNRESET &&
2543 errno != ECONNABORTED)
2544 log_error("connect() failed: %m");
2545
2546 goto finish;
2547 }
2548
2549 if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2550 log_error("Out of memory");
2551 goto finish;
2552 }
2553
2554 errno = 0;
bd40a2d8 2555 if (write(fd, message, n + 1) != n + 1) {
e983b760
LP		 2556
2557 if (errno != EPIPE &&
2558 errno != EAGAIN &&
2559 errno != ENOENT &&
2560 errno != ECONNREFUSED &&
2561 errno != ECONNRESET &&
2562 errno != ECONNABORTED)
2563 log_error("Failed to write Plymouth message: %m");
2564
2565 goto finish;
2566 }
2567
2568finish:
2569 if (fd >= 0)
2570 close_nointr_nofail(fd);
2571
2572 free(message);
2573}
2574
05e343b7
LP		 2575void manager_dispatch_bus_name_owner_changed(
2576 Manager *m,
2577 const char *name,
2578 const char* old_owner,
2579 const char *new_owner) {
2580
2581 Unit *u;
2582
2583 assert(m);
2584 assert(name);
2585
2586 if (!(u = hashmap_get(m->watch_bus, name)))
2587 return;
2588
2589 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2590}
2591
2592void manager_dispatch_bus_query_pid_done(
2593 Manager *m,
2594 const char *name,
2595 pid_t pid) {
2596
2597 Unit *u;
2598
2599 assert(m);
2600 assert(name);
2601 assert(pid >= 1);
2602
2603 if (!(u = hashmap_get(m->watch_bus, name)))
2604 return;
2605
2606 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2607}
2608
d8d5ab98 2609int manager_open_serialization(Manager *m, FILE **_f) {
b925e726 2610 char *path = NULL;
a16e1123
LP		 2611 mode_t saved_umask;
2612 int fd;
2613 FILE *f;
2614
2615 assert(_f);
2616
b925e726 2617 if (m->running_as == MANAGER_SYSTEM)
2b583ce6 2618 asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
b925e726
LP		 2619 else
2620 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
d8d5ab98 2621
b925e726
LP		 2622 if (!path)
2623 return -ENOMEM;
a16e1123
LP		 2624
2625 saved_umask = umask(0077);
2626 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2627 umask(saved_umask);
2628
2629 if (fd < 0) {
2630 free(path);
2631 return -errno;
2632 }
2633
2634 unlink(path);
2635
2636 log_debug("Serializing state to %s", path);
2637 free(path);
2638
da19d5c1 2639 if (!(f = fdopen(fd, "w+")))
a16e1123
LP		 2640 return -errno;
2641
2642 *_f = f;
2643
2644 return 0;
2645}
2646
2647int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2648 Iterator i;
2649 Unit *u;
2650 const char *t;
2651 int r;
2652
2653 assert(m);
2654 assert(f);
2655 assert(fds);
2656
01d67b43
LP		 2657 fprintf(f, "current-job-id=%i\n", m->current_job_id);
2658 fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
2659
e9ddabc2 2660 dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
10717a1a
LP		 2661 dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2662 dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
47a483a1 2663
f2382a94
LP		 2664 fputc('\n', f);
2665
a16e1123
LP		 2666 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2667 if (u->meta.id != t)
2668 continue;
2669
2670 if (!unit_can_serialize(u))
2671 continue;
2672
2673 /* Start marker */
2674 fputs(u->meta.id, f);
2675 fputc('\n', f);
2676
2677 if ((r = unit_serialize(u, f, fds)) < 0)
2678 return r;
2679 }
2680
2681 if (ferror(f))
2682 return -EIO;
2683
2684 return 0;
2685}
2686
2687int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2688 int r = 0;
2689
2690 assert(m);
2691 assert(f);
2692
2693 log_debug("Deserializing state...");
2694
9f611ad8 2695 m->n_deserializing ++;
82c64bf5 2696
10f8e83c 2697 for (;;) {
20c03b7b 2698 char line[LINE_MAX], *l;
10f8e83c
LP		 2699
2700 if (!fgets(line, sizeof(line), f)) {
2701 if (feof(f))
2702 r = 0;
2703 else
2704 r = -errno;
2705
2706 goto finish;
2707 }
2708
2709 char_array_0(line);
2710 l = strstrip(line);
2711
2712 if (l[0] == 0)
2713 break;
2714
01d67b43
LP		 2715 if (startswith(l, "current-job-id=")) {
2716 uint32_t id;
2717
2718 if (safe_atou32(l+15, &id) < 0)
2719 log_debug("Failed to parse current job id value %s", l+15);
2720 else
2721 m->current_job_id = MAX(m->current_job_id, id);
2722 } else if (startswith(l, "taint-usr=")) {
2723 int b;
2724
2725 if ((b = parse_boolean(l+10)) < 0)
2726 log_debug("Failed to parse taint /usr flag %s", l+10);
2727 else
2728 m->taint_usr = m->taint_usr || b;
2729 } else if (startswith(l, "initrd-timestamp="))
e9ddabc2
LP		 2730 dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2731 else if (startswith(l, "startup-timestamp="))
799fd0fd 2732 dual_timestamp_deserialize(l+18, &m->startup_timestamp);
10717a1a 2733 else if (startswith(l, "finish-timestamp="))
799fd0fd 2734 dual_timestamp_deserialize(l+17, &m->finish_timestamp);
10717a1a 2735 else
10f8e83c
LP		 2736 log_debug("Unknown serialization item '%s'", l);
2737 }
2738
a16e1123
LP		 2739 for (;;) {
2740 Unit *u;
2741 char name[UNIT_NAME_MAX+2];
2742
2743 /* Start marker */
2744 if (!fgets(name, sizeof(name), f)) {
2745 if (feof(f))
10f8e83c
LP		 2746 r = 0;
2747 else
2748 r = -errno;
a16e1123 2749
82c64bf5 2750 goto finish;
a16e1123
LP		 2751 }
2752
2753 char_array_0(name);
2754
398ef8ba 2755 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
82c64bf5 2756 goto finish;
a16e1123
LP		 2757
2758 if ((r = unit_deserialize(u, f, fds)) < 0)
82c64bf5 2759 goto finish;
a16e1123
LP		 2760 }
2761
10f8e83c 2762finish:
82c64bf5
LP		 2763 if (ferror(f)) {
2764 r = -EIO;
2765 goto finish;
2766 }
a16e1123 2767
9f611ad8
LP		 2768 assert(m->n_deserializing > 0);
2769 m->n_deserializing --;
82c64bf5
LP		 2770
2771 return r;
a16e1123
LP		 2772}
2773
2774int manager_reload(Manager *m) {
2775 int r, q;
2776 FILE *f;
2777 FDSet *fds;
2778
2779 assert(m);
2780
d8d5ab98 2781 if ((r = manager_open_serialization(m, &f)) < 0)
a16e1123
LP		 2782 return r;
2783
2784 if (!(fds = fdset_new())) {
2785 r = -ENOMEM;
2786 goto finish;
2787 }
2788
2789 if ((r = manager_serialize(m, f, fds)) < 0)
2790 goto finish;
2791
2792 if (fseeko(f, 0, SEEK_SET) < 0) {
2793 r = -errno;
2794 goto finish;
2795 }
2796
2797 /* From here on there is no way back. */
2798 manager_clear_jobs_and_units(m);
5a1e9937 2799 manager_undo_generators(m);
a16e1123 2800
2ded0c04 2801 /* Find new unit paths */
84e3543e
LP		 2802 lookup_paths_free(&m->lookup_paths);
2803 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2ded0c04
LP		 2804 r = q;
2805
5a1e9937
LP		 2806 manager_run_generators(m);
2807
2808 manager_build_unit_path_cache(m);
2809
9f611ad8
LP		 2810 m->n_deserializing ++;
2811
a16e1123
LP		 2812 /* First, enumerate what we can from all config files */
2813 if ((q = manager_enumerate(m)) < 0)
2814 r = q;
2815
2816 /* Second, deserialize our stored data */
2817 if ((q = manager_deserialize(m, f, fds)) < 0)
2818 r = q;
2819
2820 fclose(f);
2821 f = NULL;
2822
2823 /* Third, fire things up! */
2824 if ((q = manager_coldplug(m)) < 0)
2825 r = q;
2826
9f611ad8
LP		 2827 assert(m->n_deserializing > 0);
2828 m->n_deserializing ++;
2829
a16e1123
LP		 2830finish:
2831 if (f)
2832 fclose(f);
2833
2834 if (fds)
2835 fdset_free(fds);
2836
2837 return r;
2838}
2839
9e58ff9c
LP		 2840bool manager_is_booting_or_shutting_down(Manager *m) {
2841 Unit *u;
2842
2843 assert(m);
2844
2845 /* Is the initial job still around? */
2846 if (manager_get_job(m, 1))
2847 return true;
2848
2849 /* Is there a job for the shutdown target? */
2850 if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2851 return !!u->meta.job;
2852
2853 return false;
2854}
2855
fdf20a31 2856void manager_reset_failed(Manager *m) {
5632e374
LP		 2857 Unit *u;
2858 Iterator i;
2859
2860 assert(m);
2861
2862 HASHMAP_FOREACH(u, m->units, i)
fdf20a31 2863 unit_reset_failed(u);
5632e374
LP		 2864}
2865
8f6df3fa
LP		 2866bool manager_unit_pending_inactive(Manager *m, const char *name) {
2867 Unit *u;
2868
2869 assert(m);
2870 assert(name);
2871
2872 /* Returns true if the unit is inactive or going down */
8f6df3fa
LP		 2873 if (!(u = manager_get_unit(m, name)))
2874 return true;
2875
18ffdfda 2876 return unit_pending_inactive(u);
8f6df3fa
LP		 2877}
2878
b0c918b9 2879void manager_check_finished(Manager *m) {
e9ddabc2 2880 char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
b0c918b9
LP		 2881
2882 assert(m);
2883
2884 if (dual_timestamp_is_set(&m->finish_timestamp))
2885 return;
2886
2887 if (hashmap_size(m->jobs) > 0)
2888 return;
2889
2890 dual_timestamp_get(&m->finish_timestamp);
2891
e03ae661
LP		 2892 if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
2893
e9ddabc2
LP		 2894 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2895 log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2896 format_timespan(kernel, sizeof(kernel),
2897 m->initrd_timestamp.monotonic),
2898 format_timespan(initrd, sizeof(initrd),
2899 m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2900 format_timespan(userspace, sizeof(userspace),
2901 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2902 format_timespan(sum, sizeof(sum),
2903 m->finish_timestamp.monotonic));
2904 } else
2905 log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2906 format_timespan(kernel, sizeof(kernel),
2907 m->startup_timestamp.monotonic),
2908 format_timespan(userspace, sizeof(userspace),
2909 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2910 format_timespan(sum, sizeof(sum),
2911 m->finish_timestamp.monotonic));
2912 } else
b0c918b9
LP		 2913 log_debug("Startup finished in %s.",
2914 format_timespan(userspace, sizeof(userspace),
2915 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2916
2917}
2918
5a1e9937
LP		 2919void manager_run_generators(Manager *m) {
2920 DIR *d = NULL;
5a1e9937 2921 const char *generator_path;
83cc030f 2922 const char *argv[3];
5a1e9937
LP		 2923
2924 assert(m);
2925
af2d49f7 2926 generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
5a1e9937
LP		 2927 if (!(d = opendir(generator_path))) {
2928
2929 if (errno == ENOENT)
2930 return;
2931
2932 log_error("Failed to enumerate generator directory: %m");
2933 return;
2934 }
2935
2936 if (!m->generator_unit_path) {
f1d19aa4
LP		 2937 const char *p;
2938 char user_path[] = "/tmp/systemd-generator-XXXXXX";
5a1e9937 2939
f1d19aa4
LP		 2940 if (m->running_as == MANAGER_SYSTEM) {
2941 p = "/run/systemd/generator";
2942
2943 if (mkdir_p(p, 0755) < 0) {
2944 log_error("Failed to create generator directory: %m");
2945 goto finish;
2946 }
2947
2948 } else {
2949 if (!(p = mkdtemp(user_path))) {
2950 log_error("Failed to create generator directory: %m");
2951 goto finish;
2952 }
5a1e9937
LP		 2953 }
2954
2955 if (!(m->generator_unit_path = strdup(p))) {
2956 log_error("Failed to allocate generator unit path.");
2957 goto finish;
2958 }
2959 }
2960
83cc030f
LP		 2961 argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2962 argv[1] = m->generator_unit_path;
2963 argv[2] = NULL;
5a1e9937 2964
83cc030f 2965 execute_directory(generator_path, d, (char**) argv);
5a1e9937
LP		 2966
2967 if (rmdir(m->generator_unit_path) >= 0) {
2968 /* Uh? we were able to remove this dir? I guess that
2969 * means the directory was empty, hence let's shortcut
2970 * this */
2971
2972 free(m->generator_unit_path);
2973 m->generator_unit_path = NULL;
2974 goto finish;
2975 }
2976
2977 if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
2978 char **l;
2979
2980 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
2981 log_error("Failed to add generator directory to unit search path: %m");
2982 goto finish;
2983 }
2984
2985 strv_free(m->lookup_paths.unit_path);
2986 m->lookup_paths.unit_path = l;
7f4e0805
LP		 2987
2988 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
5a1e9937
LP		 2989 }
2990
2991finish:
2992 if (d)
2993 closedir(d);
5a1e9937
LP		 2994}
2995
2996void manager_undo_generators(Manager *m) {
2997 assert(m);
2998
2999 if (!m->generator_unit_path)
3000 return;
3001
3002 strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
3003 rm_rf(m->generator_unit_path, false, true);
3004
3005 free(m->generator_unit_path);
3006 m->generator_unit_path = NULL;
3007}
3008
06d4c99a
LP		 3009int manager_set_default_controllers(Manager *m, char **controllers) {
3010 char **l;
3011
3012 assert(m);
3013
3014 if (!(l = strv_copy(controllers)))
3015 return -ENOMEM;
3016
3017 strv_free(m->default_controllers);
3018 m->default_controllers = l;
3019
3020 return 0;
3021}
3022
f1dd0c3f
LP		 3023void manager_recheck_syslog(Manager *m) {
3024 Unit *u;
3025
3026 assert(m);
3027
3028 if (m->running_as != MANAGER_SYSTEM)
3029 return;
3030
3031 if ((u = manager_get_unit(m, SPECIAL_SYSLOG_SOCKET))) {
3032 SocketState state;
3033
3034 state = SOCKET(u)->state;
3035
3036 if (state != SOCKET_DEAD &&
3037 state != SOCKET_FAILED &&
3038 state != SOCKET_RUNNING) {
3039
3040 /* Hmm, the socket is not set up, or is still
3041 * listening, let's better not try to use
3042 * it. Note that we have no problem if the
3043 * socket is completely down, since there
3044 * might be a foreign /dev/log socket around
3045 * and we want to make use of that.
3046 */
3047
3048 log_close_syslog();
3049 return;
3050 }
3051 }
3052
3053 if ((u = manager_get_unit(m, SPECIAL_SYSLOG_TARGET)))
3054 if (TARGET(u)->state != TARGET_ACTIVE) {
3055 log_close_syslog();
3056 return;
3057 }
3058
3059 /* Hmm, OK, so the socket is either fully up, or fully down,
3060 * and the target is up, then let's make use of the socket */
3061 log_open();
3062}
3063
dfcd764e 3064static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
dfcd764e 3065 [MANAGER_SYSTEM] = "system",
af2d49f7 3066 [MANAGER_USER] = "user"
dfcd764e
LP		 3067};
3068
3069DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);
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