1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
25 #include <sys/epoll.h>
27 #include <sys/signalfd.h>
32 #include <sys/reboot.h>
33 #include <sys/ioctl.h>
35 #include <libcgroup.h>
45 #include "ratelimit.h"
47 #include "mount-setup.h"
48 #include "utmp-wtmp.h"
49 #include "unit-name.h"
51 static int enable_special_signals(Manager
*m
) {
56 /* Enable that we get SIGINT on control-alt-del */
57 if (reboot(RB_DISABLE_CAD
) < 0)
58 log_warning("Failed to enable ctrl-alt-del handling: %m");
60 if ((fd
= open_terminal("/dev/tty0", O_RDWR
)) < 0)
61 log_warning("Failed to open /dev/tty0: %m");
63 /* Enable that we get SIGWINCH on kbrequest */
64 if (ioctl(fd
, KDSIGACCEPT
, SIGWINCH
) < 0)
65 log_warning("Failed to enable kbrequest handling: %s", strerror(errno
));
67 close_nointr_nofail(fd
);
73 static int manager_setup_signals(Manager
*m
) {
75 struct epoll_event ev
;
80 /* We are not interested in SIGSTOP and friends. */
82 sa
.sa_handler
= SIG_DFL
;
83 sa
.sa_flags
= SA_NOCLDSTOP
|SA_RESTART
;
84 assert_se(sigaction(SIGCHLD
, &sa
, NULL
) == 0);
86 assert_se(sigemptyset(&mask
) == 0);
87 assert_se(sigaddset(&mask
, SIGCHLD
) == 0);
88 assert_se(sigaddset(&mask
, SIGTERM
) == 0);
89 assert_se(sigaddset(&mask
, SIGHUP
) == 0);
90 assert_se(sigaddset(&mask
, SIGUSR1
) == 0);
91 assert_se(sigaddset(&mask
, SIGUSR2
) == 0);
92 assert_se(sigaddset(&mask
, SIGINT
) == 0); /* Kernel sends us this on control-alt-del */
93 assert_se(sigaddset(&mask
, SIGWINCH
) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */
94 assert_se(sigaddset(&mask
, SIGPWR
) == 0); /* Some kernel drivers and upsd send us this on power failure */
95 assert_se(sigprocmask(SIG_SETMASK
, &mask
, NULL
) == 0);
97 m
->signal_watch
.type
= WATCH_SIGNAL
;
98 if ((m
->signal_watch
.fd
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
)) < 0)
103 ev
.data
.ptr
= &m
->signal_watch
;
105 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, m
->signal_watch
.fd
, &ev
) < 0)
108 if (m
->running_as
== MANAGER_INIT
)
109 return enable_special_signals(m
);
114 static char** session_dirs(void) {
115 const char *home
, *e
;
116 char *config_home
= NULL
, *data_home
= NULL
;
117 char **config_dirs
= NULL
, **data_dirs
= NULL
;
118 char **r
= NULL
, **t
;
120 /* Implement the mechanisms defined in
122 * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
124 * We look in both the config and the data dirs because we
125 * want to encourage that distributors ship their unit files
126 * as data, and allow overriding as configuration.
129 home
= getenv("HOME");
131 if ((e
= getenv("XDG_CONFIG_HOME"))) {
132 if (asprintf(&config_home
, "%s/systemd/session", e
) < 0)
136 if (asprintf(&config_home
, "%s/.config/systemd/session", home
) < 0)
140 if ((e
= getenv("XDG_CONFIG_DIRS")))
141 config_dirs
= strv_split(e
, ":");
143 config_dirs
= strv_new("/etc/xdg", NULL
);
148 if ((e
= getenv("XDG_DATA_HOME"))) {
149 if (asprintf(&data_home
, "%s/systemd/session", e
) < 0)
153 if (asprintf(&data_home
, "%s/.local/share/systemd/session", home
) < 0)
157 if ((e
= getenv("XDG_DATA_DIRS")))
158 data_dirs
= strv_split(e
, ":");
160 data_dirs
= strv_new("/usr/local/share", "/usr/share", NULL
);
165 /* Now merge everything we found. */
167 if (!(t
= strv_append(r
, config_home
)))
173 if (!(t
= strv_merge_concat(r
, config_dirs
, "/systemd/session")))
178 if (!(t
= strv_append(r
, SESSION_CONFIG_UNIT_PATH
)))
184 if (!(t
= strv_append(r
, data_home
)))
190 if (!(t
= strv_merge_concat(r
, data_dirs
, "/systemd/session")))
195 if (!(t
= strv_append(r
, SESSION_DATA_UNIT_PATH
)))
200 if (!strv_path_make_absolute_cwd(r
))
205 strv_free(config_dirs
);
207 strv_free(data_dirs
);
217 static int manager_find_paths(Manager
*m
) {
223 /* First priority is whatever has been passed to us via env
225 if ((e
= getenv("SYSTEMD_UNIT_PATH")))
226 if (!(m
->unit_path
= split_path_and_make_absolute(e
)))
229 if (strv_isempty(m
->unit_path
)) {
231 /* Nothing is set, so let's figure something out. */
232 strv_free(m
->unit_path
);
234 if (m
->running_as
== MANAGER_SESSION
) {
235 if (!(m
->unit_path
= session_dirs()))
238 if (!(m
->unit_path
= strv_new(
239 SYSTEM_CONFIG_UNIT_PATH
, /* /etc/systemd/system/ */
240 SYSTEM_DATA_UNIT_PATH
, /* /lib/systemd/system/ */
245 if (m
->running_as
== MANAGER_INIT
) {
246 /* /etc/init.d/ compativility does not matter to users */
248 if ((e
= getenv("SYSTEMD_SYSVINIT_PATH")))
249 if (!(m
->sysvinit_path
= split_path_and_make_absolute(e
)))
252 if (strv_isempty(m
->sysvinit_path
)) {
253 strv_free(m
->sysvinit_path
);
255 if (!(m
->sysvinit_path
= strv_new(
256 SYSTEM_SYSVINIT_PATH
, /* /etc/init.d/ */
261 if ((e
= getenv("SYSTEMD_SYSVRCND_PATH")))
262 if (!(m
->sysvrcnd_path
= split_path_and_make_absolute(e
)))
265 if (strv_isempty(m
->sysvrcnd_path
)) {
266 strv_free(m
->sysvrcnd_path
);
268 if (!(m
->sysvrcnd_path
= strv_new(
269 SYSTEM_SYSVRCND_PATH
, /* /etc/rcN.d/ */
275 strv_uniq(m
->unit_path
);
276 strv_uniq(m
->sysvinit_path
);
277 strv_uniq(m
->sysvrcnd_path
);
279 assert(!strv_isempty(m
->unit_path
));
280 if (!(t
= strv_join(m
->unit_path
, "\n\t")))
282 log_debug("Looking for unit files in:\n\t%s", t
);
285 if (!strv_isempty(m
->sysvinit_path
)) {
287 if (!(t
= strv_join(m
->sysvinit_path
, "\n\t")))
290 log_debug("Looking for SysV init scripts in:\n\t%s", t
);
293 log_debug("Ignoring SysV init scripts.");
295 if (!strv_isempty(m
->sysvrcnd_path
)) {
297 if (!(t
= strv_join(m
->sysvrcnd_path
, "\n\t")))
300 log_debug("Looking for SysV rcN.d links in:\n\t%s", t
);
303 log_debug("Ignoring SysV rcN.d links.");
308 int manager_new(ManagerRunningAs running_as
, bool confirm_spawn
, Manager
**_m
) {
313 assert(running_as
>= 0);
314 assert(running_as
< _MANAGER_RUNNING_AS_MAX
);
316 if (!(m
= new0(Manager
, 1)))
319 m
->boot_timestamp
= now(CLOCK_REALTIME
);
321 m
->running_as
= running_as
;
322 m
->confirm_spawn
= confirm_spawn
;
323 m
->name_data_slot
= -1;
325 m
->signal_watch
.fd
= m
->mount_watch
.fd
= m
->udev_watch
.fd
= m
->epoll_fd
= m
->dev_autofs_fd
= -1;
326 m
->current_job_id
= 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
328 if (!(m
->units
= hashmap_new(string_hash_func
, string_compare_func
)))
331 if (!(m
->jobs
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
334 if (!(m
->transaction_jobs
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
337 if (!(m
->watch_pids
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
340 if (!(m
->cgroup_bondings
= hashmap_new(string_hash_func
, string_compare_func
)))
343 if (!(m
->watch_bus
= hashmap_new(string_hash_func
, string_compare_func
)))
346 if ((m
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
)) < 0)
349 if ((r
= manager_find_paths(m
)) < 0)
352 if ((r
= manager_setup_signals(m
)) < 0)
355 if ((r
= manager_setup_cgroup(m
)) < 0)
358 /* Try to connect to the busses, if possible. */
359 if ((r
= bus_init_system(m
)) < 0 ||
360 (r
= bus_init_api(m
)) < 0)
371 static unsigned manager_dispatch_cleanup_queue(Manager
*m
) {
377 while ((meta
= m
->cleanup_queue
)) {
378 assert(meta
->in_cleanup_queue
);
380 unit_free(UNIT(meta
));
387 void manager_free(Manager
*m
) {
394 while ((j
= hashmap_first(m
->transaction_jobs
)))
397 while ((u
= hashmap_first(m
->units
)))
400 manager_dispatch_cleanup_queue(m
);
402 for (c
= 0; c
< _UNIT_TYPE_MAX
; c
++)
403 if (unit_vtable
[c
]->shutdown
)
404 unit_vtable
[c
]->shutdown(m
);
406 manager_shutdown_cgroup(m
);
411 hashmap_free(m
->units
);
412 hashmap_free(m
->jobs
);
413 hashmap_free(m
->transaction_jobs
);
414 hashmap_free(m
->watch_pids
);
415 hashmap_free(m
->watch_bus
);
417 if (m
->epoll_fd
>= 0)
418 close_nointr(m
->epoll_fd
);
419 if (m
->signal_watch
.fd
>= 0)
420 close_nointr(m
->signal_watch
.fd
);
422 strv_free(m
->unit_path
);
423 strv_free(m
->sysvinit_path
);
424 strv_free(m
->sysvrcnd_path
);
426 free(m
->cgroup_controller
);
427 free(m
->cgroup_hierarchy
);
429 assert(hashmap_isempty(m
->cgroup_bondings
));
430 hashmap_free(m
->cgroup_bondings
);
435 int manager_coldplug(Manager
*m
) {
444 /* First, let's ask every type to load all units from
445 * disk/kernel that it might know */
446 for (c
= 0; c
< _UNIT_TYPE_MAX
; c
++)
447 if (unit_vtable
[c
]->enumerate
)
448 if ((r
= unit_vtable
[c
]->enumerate(m
)) < 0)
451 manager_dispatch_load_queue(m
);
453 /* Then, let's set up their initial state. */
454 HASHMAP_FOREACH_KEY(u
, k
, m
->units
, i
) {
460 if (UNIT_VTABLE(u
)->coldplug
)
461 if ((r
= UNIT_VTABLE(u
)->coldplug(u
)) < 0)
465 /* Now that the initial devices are available, let's see if we
466 * can write the utmp file */
467 manager_write_utmp_reboot(m
);
472 static void transaction_delete_job(Manager
*m
, Job
*j
, bool delete_dependencies
) {
476 /* Deletes one job from the transaction */
478 manager_transaction_unlink_job(m
, j
, delete_dependencies
);
484 static void transaction_delete_unit(Manager
*m
, Unit
*u
) {
487 /* Deletes all jobs associated with a certain unit from the
490 while ((j
= hashmap_get(m
->transaction_jobs
, u
)))
491 transaction_delete_job(m
, j
, true);
494 static void transaction_clean_dependencies(Manager
*m
) {
500 /* Drops all dependencies of all installed jobs */
502 HASHMAP_FOREACH(j
, m
->jobs
, i
) {
503 while (j
->subject_list
)
504 job_dependency_free(j
->subject_list
);
505 while (j
->object_list
)
506 job_dependency_free(j
->object_list
);
509 assert(!m
->transaction_anchor
);
512 static void transaction_abort(Manager
*m
) {
517 while ((j
= hashmap_first(m
->transaction_jobs
)))
519 transaction_delete_job(m
, j
, true);
523 assert(hashmap_isempty(m
->transaction_jobs
));
525 transaction_clean_dependencies(m
);
528 static void transaction_find_jobs_that_matter_to_anchor(Manager
*m
, Job
*j
, unsigned generation
) {
533 /* A recursive sweep through the graph that marks all units
534 * that matter to the anchor job, i.e. are directly or
535 * indirectly a dependency of the anchor job via paths that
536 * are fully marked as mattering. */
541 l
= m
->transaction_anchor
;
543 LIST_FOREACH(subject
, l
, l
) {
545 /* This link does not matter */
549 /* This unit has already been marked */
550 if (l
->object
->generation
== generation
)
553 l
->object
->matters_to_anchor
= true;
554 l
->object
->generation
= generation
;
556 transaction_find_jobs_that_matter_to_anchor(m
, l
->object
, generation
);
560 static void transaction_merge_and_delete_job(Manager
*m
, Job
*j
, Job
*other
, JobType t
) {
561 JobDependency
*l
, *last
;
565 assert(j
->unit
== other
->unit
);
566 assert(!j
->installed
);
568 /* Merges 'other' into 'j' and then deletes j. */
571 j
->state
= JOB_WAITING
;
572 j
->override
= j
->override
|| other
->override
;
574 j
->matters_to_anchor
= j
->matters_to_anchor
|| other
->matters_to_anchor
;
576 /* Patch us in as new owner of the JobDependency objects */
578 LIST_FOREACH(subject
, l
, other
->subject_list
) {
579 assert(l
->subject
== other
);
584 /* Merge both lists */
586 last
->subject_next
= j
->subject_list
;
588 j
->subject_list
->subject_prev
= last
;
589 j
->subject_list
= other
->subject_list
;
592 /* Patch us in as new owner of the JobDependency objects */
594 LIST_FOREACH(object
, l
, other
->object_list
) {
595 assert(l
->object
== other
);
600 /* Merge both lists */
602 last
->object_next
= j
->object_list
;
604 j
->object_list
->object_prev
= last
;
605 j
->object_list
= other
->object_list
;
608 /* Kill the other job */
609 other
->subject_list
= NULL
;
610 other
->object_list
= NULL
;
611 transaction_delete_job(m
, other
, true);
614 static int delete_one_unmergeable_job(Manager
*m
, Job
*j
) {
619 /* Tries to delete one item in the linked list
620 * j->transaction_next->transaction_next->... that conflicts
621 * whith another one, in an attempt to make an inconsistent
622 * transaction work. */
624 /* We rely here on the fact that if a merged with b does not
625 * merge with c, either a or b merge with c neither */
626 LIST_FOREACH(transaction
, j
, j
)
627 LIST_FOREACH(transaction
, k
, j
->transaction_next
) {
630 /* Is this one mergeable? Then skip it */
631 if (job_type_is_mergeable(j
->type
, k
->type
))
634 /* Ok, we found two that conflict, let's see if we can
635 * drop one of them */
636 if (!j
->matters_to_anchor
)
638 else if (!k
->matters_to_anchor
)
643 /* Ok, we can drop one, so let's do so. */
644 log_debug("Trying to fix job merging by deleting job %s/%s", d
->unit
->meta
.id
, job_type_to_string(d
->type
));
645 transaction_delete_job(m
, d
, true);
652 static int transaction_merge_jobs(Manager
*m
) {
659 /* First step, check whether any of the jobs for one specific
660 * task conflict. If so, try to drop one of them. */
661 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
666 LIST_FOREACH(transaction
, k
, j
->transaction_next
) {
667 if ((r
= job_type_merge(&t
, k
->type
)) >= 0)
670 /* OK, we could not merge all jobs for this
671 * action. Let's see if we can get rid of one
674 if ((r
= delete_one_unmergeable_job(m
, j
)) >= 0)
675 /* Ok, we managed to drop one, now
676 * let's ask our callers to call us
677 * again after garbage collecting */
680 /* We couldn't merge anything. Failure */
685 /* Second step, merge the jobs. */
686 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
690 /* Merge all transactions */
691 LIST_FOREACH(transaction
, k
, j
->transaction_next
)
692 assert_se(job_type_merge(&t
, k
->type
) == 0);
694 /* If an active job is mergeable, merge it too */
695 if (j
->unit
->meta
.job
)
696 job_type_merge(&t
, j
->unit
->meta
.job
->type
); /* Might fail. Which is OK */
698 while ((k
= j
->transaction_next
)) {
700 transaction_merge_and_delete_job(m
, k
, j
, t
);
703 transaction_merge_and_delete_job(m
, j
, k
, t
);
706 assert(!j
->transaction_next
);
707 assert(!j
->transaction_prev
);
713 static void transaction_drop_redundant(Manager
*m
) {
718 /* Goes through the transaction and removes all jobs that are
727 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
728 bool changes_something
= false;
731 LIST_FOREACH(transaction
, k
, j
) {
733 if (!job_is_anchor(k
) &&
734 job_type_is_redundant(k
->type
, unit_active_state(k
->unit
)))
737 changes_something
= true;
741 if (changes_something
)
744 log_debug("Found redundant job %s/%s, dropping.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
745 transaction_delete_job(m
, j
, false);
753 static bool unit_matters_to_anchor(Unit
*u
, Job
*j
) {
755 assert(!j
->transaction_prev
);
757 /* Checks whether at least one of the jobs for this unit
758 * matters to the anchor. */
760 LIST_FOREACH(transaction
, j
, j
)
761 if (j
->matters_to_anchor
)
767 static int transaction_verify_order_one(Manager
*m
, Job
*j
, Job
*from
, unsigned generation
) {
774 assert(!j
->transaction_prev
);
776 /* Does a recursive sweep through the ordering graph, looking
777 * for a cycle. If we find cycle we try to break it. */
779 /* Did we find a cycle? */
780 if (j
->marker
&& j
->generation
== generation
) {
783 /* So, we already have been here. We have a
784 * cycle. Let's try to break it. We go backwards in
785 * our path and try to find a suitable job to
786 * remove. We use the marker to find our way back,
787 * since smart how we are we stored our way back in
790 log_debug("Found ordering cycle on %s/%s", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
792 for (k
= from
; k
; k
= (k
->generation
== generation
? k
->marker
: NULL
)) {
794 log_debug("Walked on cycle path to %s/%s", k
->unit
->meta
.id
, job_type_to_string(k
->type
));
797 !unit_matters_to_anchor(k
->unit
, k
)) {
798 /* Ok, we can drop this one, so let's
800 log_debug("Breaking order cycle by deleting job %s/%s", k
->unit
->meta
.id
, job_type_to_string(k
->type
));
801 transaction_delete_unit(m
, k
->unit
);
805 /* Check if this in fact was the beginning of
811 log_debug("Unable to break cycle");
816 /* Make the marker point to where we come from, so that we can
817 * find our way backwards if we want to break a cycle */
819 j
->generation
= generation
;
821 /* We assume that the the dependencies are bidirectional, and
822 * hence can ignore UNIT_AFTER */
823 SET_FOREACH(u
, j
->unit
->meta
.dependencies
[UNIT_BEFORE
], i
) {
826 /* Is there a job for this unit? */
827 if (!(o
= hashmap_get(m
->transaction_jobs
, u
)))
829 /* Ok, there is no job for this in the
830 * transaction, but maybe there is already one
832 if (!(o
= u
->meta
.job
))
835 if ((r
= transaction_verify_order_one(m
, o
, j
, generation
)) < 0)
839 /* Ok, let's backtrack, and remember that this entry is not on
840 * our path anymore. */
846 static int transaction_verify_order(Manager
*m
, unsigned *generation
) {
854 /* Check if the ordering graph is cyclic. If it is, try to fix
855 * that up by dropping one of the jobs. */
857 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
)
858 if ((r
= transaction_verify_order_one(m
, j
, NULL
, (*generation
)++)) < 0)
864 static void transaction_collect_garbage(Manager
*m
) {
869 /* Drop jobs that are not required by any other job */
877 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
881 log_debug("Garbage collecting job %s/%s", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
882 transaction_delete_job(m
, j
, true);
890 static int transaction_is_destructive(Manager
*m
, JobMode mode
) {
896 /* Checks whether applying this transaction means that
897 * existing jobs would be replaced */
899 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
902 assert(!j
->transaction_prev
);
903 assert(!j
->transaction_next
);
905 if (j
->unit
->meta
.job
&&
906 j
->unit
->meta
.job
!= j
&&
907 !job_type_is_superset(j
->type
, j
->unit
->meta
.job
->type
))
914 static void transaction_minimize_impact(Manager
*m
) {
918 /* Drops all unnecessary jobs that reverse already active jobs
919 * or that stop a running service. */
927 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
928 LIST_FOREACH(transaction
, j
, j
) {
929 bool stops_running_service
, changes_existing_job
;
931 /* If it matters, we shouldn't drop it */
932 if (j
->matters_to_anchor
)
935 /* Would this stop a running service?
936 * Would this change an existing job?
937 * If so, let's drop this entry */
939 stops_running_service
=
940 j
->type
== JOB_STOP
&& UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j
->unit
));
942 changes_existing_job
=
943 j
->unit
->meta
.job
&& job_type_is_conflicting(j
->type
, j
->unit
->meta
.job
->state
);
945 if (!stops_running_service
&& !changes_existing_job
)
948 if (stops_running_service
)
949 log_debug("%s/%s would stop a running service.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
951 if (changes_existing_job
)
952 log_debug("%s/%s would change existing job.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
954 /* Ok, let's get rid of this */
955 log_debug("Deleting %s/%s to minimize impact.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
957 transaction_delete_job(m
, j
, true);
969 static int transaction_apply(Manager
*m
, JobMode mode
) {
974 /* Moves the transaction jobs to the set of active jobs */
976 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
978 assert(!j
->transaction_prev
);
979 assert(!j
->transaction_next
);
984 if ((r
= hashmap_put(m
->jobs
, UINT32_TO_PTR(j
->id
), j
)) < 0)
988 while ((j
= hashmap_steal_first(m
->transaction_jobs
))) {
992 if (j
->unit
->meta
.job
)
993 job_free(j
->unit
->meta
.job
);
995 j
->unit
->meta
.job
= j
;
998 /* We're fully installed. Now let's free data we don't
1001 assert(!j
->transaction_next
);
1002 assert(!j
->transaction_prev
);
1004 job_add_to_run_queue(j
);
1005 job_add_to_dbus_queue(j
);
1008 /* As last step, kill all remaining job dependencies. */
1009 transaction_clean_dependencies(m
);
1015 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1019 hashmap_remove(m
->jobs
, UINT32_TO_PTR(j
->id
));
1025 static int transaction_activate(Manager
*m
, JobMode mode
) {
1027 unsigned generation
= 1;
1031 /* This applies the changes recorded in transaction_jobs to
1032 * the actual list of jobs, if possible. */
1034 /* First step: figure out which jobs matter */
1035 transaction_find_jobs_that_matter_to_anchor(m
, NULL
, generation
++);
1037 /* Second step: Try not to stop any running services if
1038 * we don't have to. Don't try to reverse running
1039 * jobs if we don't have to. */
1040 transaction_minimize_impact(m
);
1042 /* Third step: Drop redundant jobs */
1043 transaction_drop_redundant(m
);
1046 /* Fourth step: Let's remove unneeded jobs that might
1048 transaction_collect_garbage(m
);
1050 /* Fifth step: verify order makes sense and correct
1051 * cycles if necessary and possible */
1052 if ((r
= transaction_verify_order(m
, &generation
)) >= 0)
1056 log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r
));
1060 /* Let's see if the resulting transaction ordering
1061 * graph is still cyclic... */
1065 /* Sixth step: let's drop unmergeable entries if
1066 * necessary and possible, merge entries we can
1068 if ((r
= transaction_merge_jobs(m
)) >= 0)
1072 log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r
));
1076 /* Seventh step: an entry got dropped, let's garbage
1077 * collect its dependencies. */
1078 transaction_collect_garbage(m
);
1080 /* Let's see if the resulting transaction still has
1081 * unmergeable entries ... */
1084 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1085 transaction_drop_redundant(m
);
1087 /* Ninth step: check whether we can actually apply this */
1088 if (mode
== JOB_FAIL
)
1089 if ((r
= transaction_is_destructive(m
, mode
)) < 0) {
1090 log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r
));
1094 /* Tenth step: apply changes */
1095 if ((r
= transaction_apply(m
, mode
)) < 0) {
1096 log_debug("Failed to apply transaction: %s", strerror(-r
));
1100 assert(hashmap_isempty(m
->transaction_jobs
));
1101 assert(!m
->transaction_anchor
);
1106 transaction_abort(m
);
1110 static Job
* transaction_add_one_job(Manager
*m
, JobType type
, Unit
*unit
, bool override
, bool *is_new
) {
1117 /* Looks for an axisting prospective job and returns that. If
1118 * it doesn't exist it is created and added to the prospective
1121 f
= hashmap_get(m
->transaction_jobs
, unit
);
1123 LIST_FOREACH(transaction
, j
, f
) {
1124 assert(j
->unit
== unit
);
1126 if (j
->type
== type
) {
1133 if (unit
->meta
.job
&& unit
->meta
.job
->type
== type
)
1135 else if (!(j
= job_new(m
, type
, unit
)))
1140 j
->matters_to_anchor
= false;
1141 j
->override
= override
;
1143 LIST_PREPEND(Job
, transaction
, f
, j
);
1145 if ((r
= hashmap_replace(m
->transaction_jobs
, unit
, f
)) < 0) {
1153 log_debug("Added job %s/%s to transaction.", unit
->meta
.id
, job_type_to_string(type
));
1158 void manager_transaction_unlink_job(Manager
*m
, Job
*j
, bool delete_dependencies
) {
1162 if (j
->transaction_prev
)
1163 j
->transaction_prev
->transaction_next
= j
->transaction_next
;
1164 else if (j
->transaction_next
)
1165 hashmap_replace(m
->transaction_jobs
, j
->unit
, j
->transaction_next
);
1167 hashmap_remove_value(m
->transaction_jobs
, j
->unit
, j
);
1169 if (j
->transaction_next
)
1170 j
->transaction_next
->transaction_prev
= j
->transaction_prev
;
1172 j
->transaction_prev
= j
->transaction_next
= NULL
;
1174 while (j
->subject_list
)
1175 job_dependency_free(j
->subject_list
);
1177 while (j
->object_list
) {
1178 Job
*other
= j
->object_list
->matters
? j
->object_list
->subject
: NULL
;
1180 job_dependency_free(j
->object_list
);
1182 if (other
&& delete_dependencies
) {
1183 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1184 other
->unit
->meta
.id
, job_type_to_string(other
->type
),
1185 j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1186 transaction_delete_job(m
, other
, delete_dependencies
);
1191 static int transaction_add_job_and_dependencies(
1206 assert(type
< _JOB_TYPE_MAX
);
1209 if (unit
->meta
.load_state
!= UNIT_LOADED
)
1212 if (!unit_job_is_applicable(unit
, type
))
1215 /* First add the job. */
1216 if (!(ret
= transaction_add_one_job(m
, type
, unit
, override
, &is_new
)))
1219 /* Then, add a link to the job. */
1220 if (!job_dependency_new(by
, ret
, matters
))
1224 /* Finally, recursively add in all dependencies. */
1225 if (type
== JOB_START
|| type
== JOB_RELOAD_OR_START
) {
1226 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRES
], i
)
1227 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, true, override
, NULL
)) < 0 && r
!= -EBADR
)
1230 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
1231 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, !override
, override
, NULL
)) < 0 && r
!= -EBADR
)
1232 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep
->meta
.id
, strerror(-r
));
1234 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_WANTS
], i
)
1235 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, false, false, NULL
)) < 0)
1236 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep
->meta
.id
, strerror(-r
));
1238 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUISITE
], i
)
1239 if ((r
= transaction_add_job_and_dependencies(m
, JOB_VERIFY_ACTIVE
, dep
, ret
, true, override
, NULL
)) < 0 && r
!= -EBADR
)
1242 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUISITE_OVERRIDABLE
], i
)
1243 if ((r
= transaction_add_job_and_dependencies(m
, JOB_VERIFY_ACTIVE
, dep
, ret
, !override
, override
, NULL
)) < 0 && r
!= -EBADR
)
1244 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep
->meta
.id
, strerror(-r
));
1246 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
1247 if ((r
= transaction_add_job_and_dependencies(m
, JOB_STOP
, dep
, ret
, true, override
, NULL
)) < 0 && r
!= -EBADR
)
1250 } else if (type
== JOB_STOP
|| type
== JOB_RESTART
|| type
== JOB_TRY_RESTART
) {
1252 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
1253 if ((r
= transaction_add_job_and_dependencies(m
, type
, dep
, ret
, true, override
, NULL
)) < 0 && r
!= -EBADR
)
1257 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1269 int manager_add_job(Manager
*m
, JobType type
, Unit
*unit
, JobMode mode
, bool override
, Job
**_ret
) {
1274 assert(type
< _JOB_TYPE_MAX
);
1276 assert(mode
< _JOB_MODE_MAX
);
1278 log_debug("Trying to enqueue job %s/%s", unit
->meta
.id
, job_type_to_string(type
));
1280 if ((r
= transaction_add_job_and_dependencies(m
, type
, unit
, NULL
, true, override
, &ret
)) < 0) {
1281 transaction_abort(m
);
1285 if ((r
= transaction_activate(m
, mode
)) < 0)
1288 log_debug("Enqueued job %s/%s as %u", unit
->meta
.id
, job_type_to_string(type
), (unsigned) ret
->id
);
1296 int manager_add_job_by_name(Manager
*m
, JobType type
, const char *name
, JobMode mode
, bool override
, Job
**_ret
) {
1301 assert(type
< _JOB_TYPE_MAX
);
1303 assert(mode
< _JOB_MODE_MAX
);
1305 if ((r
= manager_load_unit(m
, name
, NULL
, &unit
)) < 0)
1308 return manager_add_job(m
, type
, unit
, mode
, override
, _ret
);
1311 Job
*manager_get_job(Manager
*m
, uint32_t id
) {
1314 return hashmap_get(m
->jobs
, UINT32_TO_PTR(id
));
1317 Unit
*manager_get_unit(Manager
*m
, const char *name
) {
1321 return hashmap_get(m
->units
, name
);
1324 unsigned manager_dispatch_load_queue(Manager
*m
) {
1330 /* Make sure we are not run recursively */
1331 if (m
->dispatching_load_queue
)
1334 m
->dispatching_load_queue
= true;
1336 /* Dispatches the load queue. Takes a unit from the queue and
1337 * tries to load its data until the queue is empty */
1339 while ((meta
= m
->load_queue
)) {
1340 assert(meta
->in_load_queue
);
1342 unit_load(UNIT(meta
));
1346 m
->dispatching_load_queue
= false;
1350 int manager_load_unit(Manager
*m
, const char *name
, const char *path
, Unit
**_ret
) {
1355 assert(name
|| path
);
1357 /* This will load the service information files, but not actually
1358 * start any services or anything. */
1360 if (path
&& !is_path(path
))
1364 name
= file_name_from_path(path
);
1366 if (!unit_name_is_valid(name
))
1369 if ((ret
= manager_get_unit(m
, name
))) {
1374 if (!(ret
= unit_new(m
)))
1378 if (!(ret
->meta
.fragment_path
= strdup(path
))) {
1383 if ((r
= unit_add_name(ret
, name
)) < 0) {
1388 unit_add_to_load_queue(ret
);
1389 unit_add_to_dbus_queue(ret
);
1391 manager_dispatch_load_queue(m
);
1394 *_ret
= unit_follow_merge(ret
);
1399 void manager_dump_jobs(Manager
*s
, FILE *f
, const char *prefix
) {
1406 HASHMAP_FOREACH(j
, s
->jobs
, i
)
1407 job_dump(j
, f
, prefix
);
1410 void manager_dump_units(Manager
*s
, FILE *f
, const char *prefix
) {
1418 HASHMAP_FOREACH_KEY(u
, t
, s
->units
, i
)
1419 if (u
->meta
.id
== t
)
1420 unit_dump(u
, f
, prefix
);
1423 void manager_clear_jobs(Manager
*m
) {
1428 transaction_abort(m
);
1430 while ((j
= hashmap_first(m
->jobs
)))
1434 unsigned manager_dispatch_run_queue(Manager
*m
) {
1438 if (m
->dispatching_run_queue
)
1441 m
->dispatching_run_queue
= true;
1443 while ((j
= m
->run_queue
)) {
1444 assert(j
->installed
);
1445 assert(j
->in_run_queue
);
1447 job_run_and_invalidate(j
);
1451 m
->dispatching_run_queue
= false;
1455 unsigned manager_dispatch_dbus_queue(Manager
*m
) {
1462 if (m
->dispatching_dbus_queue
)
1465 m
->dispatching_dbus_queue
= true;
1467 while ((meta
= m
->dbus_unit_queue
)) {
1468 assert(meta
->in_dbus_queue
);
1470 bus_unit_send_change_signal(UNIT(meta
));
1474 while ((j
= m
->dbus_job_queue
)) {
1475 assert(j
->in_dbus_queue
);
1477 bus_job_send_change_signal(j
);
1481 m
->dispatching_dbus_queue
= false;
1485 static int manager_dispatch_sigchld(Manager
*m
) {
1494 /* First we call waitd() for a PID and do not reap the
1495 * zombie. That way we can still access /proc/$PID for
1496 * it while it is a zombie. */
1497 if (waitid(P_ALL
, 0, &si
, WEXITED
|WNOHANG
|WNOWAIT
) < 0) {
1499 if (errno
== ECHILD
)
1511 if (si
.si_code
== CLD_EXITED
|| si
.si_code
== CLD_KILLED
|| si
.si_code
== CLD_DUMPED
) {
1514 get_process_name(si
.si_pid
, &name
);
1515 log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si
.si_pid
, strna(name
));
1519 /* And now, we actually reap the zombie. */
1520 if (waitid(P_PID
, si
.si_pid
, &si
, WEXITED
) < 0) {
1527 if (si
.si_code
!= CLD_EXITED
&& si
.si_code
!= CLD_KILLED
&& si
.si_code
!= CLD_DUMPED
)
1530 log_debug("Child %llu died (code=%s, status=%i/%s)",
1531 (long long unsigned) si
.si_pid
,
1532 sigchld_code_to_string(si
.si_code
),
1534 strna(si
.si_code
== CLD_EXITED
? exit_status_to_string(si
.si_status
) : strsignal(si
.si_status
)));
1536 if (!(u
= hashmap_remove(m
->watch_pids
, UINT32_TO_PTR(si
.si_pid
))))
1539 log_debug("Child %llu belongs to %s", (long long unsigned) si
.si_pid
, u
->meta
.id
);
1541 UNIT_VTABLE(u
)->sigchld_event(u
, si
.si_pid
, si
.si_code
, si
.si_status
);
1547 static void manager_start_target(Manager
*m
, const char *name
) {
1550 if ((r
= manager_add_job_by_name(m
, JOB_START
, name
, JOB_REPLACE
, true, NULL
)) < 0)
1551 log_error("Failed to enqueue %s job: %s", name
, strerror(-r
));
1554 static int manager_process_signal_fd(Manager
*m
, bool *quit
) {
1556 struct signalfd_siginfo sfsi
;
1557 bool sigchld
= false;
1562 if ((n
= read(m
->signal_watch
.fd
, &sfsi
, sizeof(sfsi
))) != sizeof(sfsi
)) {
1567 if (errno
== EAGAIN
)
1573 switch (sfsi
.ssi_signo
) {
1582 if (m
->running_as
== MANAGER_INIT
) {
1583 manager_start_target(m
, SPECIAL_CTRL_ALT_DEL_TARGET
);
1592 if (m
->running_as
== MANAGER_INIT
)
1593 manager_start_target(m
, SPECIAL_KBREQUEST_TARGET
);
1595 /* This is a nop on non-init */
1599 if (m
->running_as
== MANAGER_INIT
)
1600 manager_start_target(m
, SPECIAL_SIGPWR_TARGET
);
1602 /* This is a nop on non-init */
1606 manager_dump_units(m
, stdout
, "\t");
1607 manager_dump_jobs(m
, stdout
, "\t");
1613 u
= manager_get_unit(m
, SPECIAL_DBUS_SERVICE
);
1615 if (!u
|| UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
))) {
1616 log_info("Trying to reconnect to bus...");
1621 if (!u
|| !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
))) {
1622 log_info("Loading D-Bus service...");
1623 manager_start_target(m
, SPECIAL_DBUS_SERVICE
);
1630 log_info("Got unhandled signal <%s>.", strsignal(sfsi
.ssi_signo
));
1635 return manager_dispatch_sigchld(m
);
1640 static int process_event(Manager
*m
, struct epoll_event
*ev
, bool *quit
) {
1647 assert(w
= ev
->data
.ptr
);
1653 /* An incoming signal? */
1654 if (ev
->events
!= EPOLLIN
)
1657 if ((r
= manager_process_signal_fd(m
, quit
)) < 0)
1664 /* Some fd event, to be dispatched to the units */
1665 UNIT_VTABLE(w
->data
.unit
)->fd_event(w
->data
.unit
, w
->fd
, ev
->events
, w
);
1672 /* Some timer event, to be dispatched to the units */
1673 if ((k
= read(w
->fd
, &v
, sizeof(v
))) != sizeof(v
)) {
1675 if (k
< 0 && (errno
== EINTR
|| errno
== EAGAIN
))
1678 return k
< 0 ? -errno
: -EIO
;
1681 UNIT_VTABLE(w
->data
.unit
)->timer_event(w
->data
.unit
, v
, w
);
1686 /* Some mount table change, intended for the mount subsystem */
1687 mount_fd_event(m
, ev
->events
);
1691 /* Some notification from udev, intended for the device subsystem */
1692 device_fd_event(m
, ev
->events
);
1695 case WATCH_DBUS_WATCH
:
1696 bus_watch_event(m
, w
, ev
->events
);
1699 case WATCH_DBUS_TIMEOUT
:
1700 bus_timeout_event(m
, w
, ev
->events
);
1704 assert_not_reached("Unknown epoll event type.");
1710 int manager_loop(Manager
*m
) {
1714 RATELIMIT_DEFINE(rl
, 1*USEC_PER_SEC
, 1000);
1719 struct epoll_event event
;
1722 if (!ratelimit_test(&rl
)) {
1723 /* Yay, something is going seriously wrong, pause a little */
1724 log_warning("Looping too fast. Throttling execution a little.");
1728 if (manager_dispatch_cleanup_queue(m
) > 0)
1731 if (manager_dispatch_load_queue(m
) > 0)
1734 if (manager_dispatch_run_queue(m
) > 0)
1737 if (bus_dispatch(m
) > 0)
1740 if (manager_dispatch_dbus_queue(m
) > 0)
1743 if ((n
= epoll_wait(m
->epoll_fd
, &event
, 1, -1)) < 0) {
1745 if (errno
== -EINTR
)
1753 if ((r
= process_event(m
, &event
, &quit
)) < 0)
1760 int manager_get_unit_from_dbus_path(Manager
*m
, const char *s
, Unit
**_u
) {
1768 if (!startswith(s
, "/org/freedesktop/systemd1/unit/"))
1771 if (!(n
= bus_path_unescape(s
+31)))
1774 u
= manager_get_unit(m
, n
);
1785 int manager_get_job_from_dbus_path(Manager
*m
, const char *s
, Job
**_j
) {
1794 if (!startswith(s
, "/org/freedesktop/systemd1/job/"))
1797 if ((r
= safe_atou(s
+ 30, &id
)) < 0)
1800 if (!(j
= manager_get_job(m
, id
)))
1808 static bool manager_utmp_good(Manager
*m
) {
1813 if ((r
= mount_path_is_mounted(m
, _PATH_UTMPX
)) <= 0) {
1816 log_warning("Failed to determine whether " _PATH_UTMPX
" is mounted: %s", strerror(-r
));
1824 void manager_write_utmp_reboot(Manager
*m
) {
1829 if (m
->utmp_reboot_written
)
1832 if (m
->running_as
!= MANAGER_INIT
)
1835 if (!manager_utmp_good(m
))
1838 if ((r
= utmp_put_reboot(m
->boot_timestamp
)) < 0) {
1840 if (r
!= -ENOENT
&& r
!= -EROFS
)
1841 log_warning("Failed to write utmp/wtmp: %s", strerror(-r
));
1846 m
->utmp_reboot_written
= true;
1849 void manager_write_utmp_runlevel(Manager
*m
, Unit
*u
) {
1855 if (u
->meta
.type
!= UNIT_TARGET
)
1858 if (m
->running_as
!= MANAGER_INIT
)
1861 if (!manager_utmp_good(m
))
1864 if ((runlevel
= target_get_runlevel(TARGET(u
))) <= 0)
1867 if ((r
= utmp_put_runlevel(0, runlevel
, 0)) < 0) {
1869 if (r
!= -ENOENT
&& r
!= -EROFS
)
1870 log_warning("Failed to write utmp/wtmp: %s", strerror(-r
));
1874 void manager_dispatch_bus_name_owner_changed(
1877 const char* old_owner
,
1878 const char *new_owner
) {
1885 if (!(u
= hashmap_get(m
->watch_bus
, name
)))
1888 UNIT_VTABLE(u
)->bus_name_owner_change(u
, name
, old_owner
, new_owner
);
1891 void manager_dispatch_bus_query_pid_done(
1902 if (!(u
= hashmap_get(m
->watch_bus
, name
)))
1905 UNIT_VTABLE(u
)->bus_query_pid_done(u
, name
, pid
);
1908 static const char* const manager_running_as_table
[_MANAGER_RUNNING_AS_MAX
] = {
1909 [MANAGER_INIT
] = "init",
1910 [MANAGER_SYSTEM
] = "system",
1911 [MANAGER_SESSION
] = "session"
1914 DEFINE_STRING_TABLE_LOOKUP(manager_running_as
, ManagerRunningAs
);