X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=manager.c;h=0187d3b374650cb34550268f514831c77bb35be4;hb=7ccfb64aa5dce4f71debf9b5c1f29b185f0c6f5e;hp=170ea84344f82bd6363ca8f62983f67707fe1fa7;hpb=cea8e32e3fc57569094e2ddf4167f2a9864fc3a4;p=elogind.git
diff --git a/manager.c b/manager.c
index 170ea8434..0187d3b37 100644
--- a/manager.c
+++ b/manager.c
@@ -1,22 +1,333 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see .
+***/
+
#include
#include
#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
#include "manager.h"
#include "hashmap.h"
#include "macro.h"
#include "strv.h"
-#include "load-fragment.h"
+#include "log.h"
+#include "util.h"
+#include "ratelimit.h"
+#include "cgroup.h"
+#include "mount-setup.h"
+#include "utmp-wtmp.h"
+#include "unit-name.h"
+#include "dbus-unit.h"
+#include "dbus-job.h"
+
+static int enable_special_signals(Manager *m) {
+ char fd;
+
+ assert(m);
+
+ /* Enable that we get SIGINT on control-alt-del */
+ if (reboot(RB_DISABLE_CAD) < 0)
+ log_warning("Failed to enable ctrl-alt-del handling: %m");
+
+ if ((fd = open_terminal("/dev/tty0", O_RDWR)) < 0)
+ log_warning("Failed to open /dev/tty0: %m");
+ else {
+ /* Enable that we get SIGWINCH on kbrequest */
+ if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
+ log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
+
+ close_nointr_nofail(fd);
+ }
+
+ return 0;
+}
+
+static int manager_setup_signals(Manager *m) {
+ sigset_t mask;
+ struct epoll_event ev;
+ struct sigaction sa;
+
+ assert(m);
+
+ /* We are not interested in SIGSTOP and friends. */
+ zero(sa);
+ sa.sa_handler = SIG_DFL;
+ sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
+ assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
+
+ assert_se(sigemptyset(&mask) == 0);
+ assert_se(sigaddset(&mask, SIGCHLD) == 0);
+ assert_se(sigaddset(&mask, SIGTERM) == 0);
+ assert_se(sigaddset(&mask, SIGHUP) == 0);
+ assert_se(sigaddset(&mask, SIGUSR1) == 0);
+ assert_se(sigaddset(&mask, SIGUSR2) == 0);
+ assert_se(sigaddset(&mask, SIGINT) == 0); /* Kernel sends us this on control-alt-del */
+ assert_se(sigaddset(&mask, SIGWINCH) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */
+ assert_se(sigaddset(&mask, SIGPWR) == 0); /* Some kernel drivers and upsd send us this on power failure */
+ assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
+
+ m->signal_watch.type = WATCH_SIGNAL;
+ if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
+ return -errno;
+
+ zero(ev);
+ ev.events = EPOLLIN;
+ ev.data.ptr = &m->signal_watch;
+
+ if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
+ return -errno;
+
+ if (m->running_as == MANAGER_INIT)
+ return enable_special_signals(m);
+
+ return 0;
+}
+
+static char** session_dirs(void) {
+ const char *home, *e;
+ char *config_home = NULL, *data_home = NULL;
+ char **config_dirs = NULL, **data_dirs = NULL;
+ char **r = NULL, **t;
+
+ /* Implement the mechanisms defined in
+ *
+ * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
+ *
+ * We look in both the config and the data dirs because we
+ * want to encourage that distributors ship their unit files
+ * as data, and allow overriding as configuration.
+ */
+
+ home = getenv("HOME");
+
+ if ((e = getenv("XDG_CONFIG_HOME"))) {
+ if (asprintf(&config_home, "%s/systemd/session", e) < 0)
+ goto fail;
+
+ } else if (home) {
+ if (asprintf(&config_home, "%s/.config/systemd/session", home) < 0)
+ goto fail;
+ }
+
+ if ((e = getenv("XDG_CONFIG_DIRS")))
+ config_dirs = strv_split(e, ":");
+ else
+ config_dirs = strv_new("/etc/xdg", NULL);
+
+ if (!config_dirs)
+ goto fail;
+
+ if ((e = getenv("XDG_DATA_HOME"))) {
+ if (asprintf(&data_home, "%s/systemd/session", e) < 0)
+ goto fail;
+
+ } else if (home) {
+ if (asprintf(&data_home, "%s/.local/share/systemd/session", home) < 0)
+ goto fail;
+ }
+
+ if ((e = getenv("XDG_DATA_DIRS")))
+ data_dirs = strv_split(e, ":");
+ else
+ data_dirs = strv_new("/usr/local/share", "/usr/share", NULL);
+
+ if (!data_dirs)
+ goto fail;
+
+ /* Now merge everything we found. */
+ if (config_home) {
+ if (!(t = strv_append(r, config_home)))
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (!(t = strv_merge_concat(r, config_dirs, "/systemd/session")))
+ goto finish;
+ strv_free(r);
+ r = t;
+
+ if (!(t = strv_append(r, SESSION_CONFIG_UNIT_PATH)))
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (data_home) {
+ if (!(t = strv_append(r, data_home)))
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (!(t = strv_merge_concat(r, data_dirs, "/systemd/session")))
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (!(t = strv_append(r, SESSION_DATA_UNIT_PATH)))
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (!strv_path_make_absolute_cwd(r))
+ goto fail;
+
+finish:
+ free(config_home);
+ strv_free(config_dirs);
+ free(data_home);
+ strv_free(data_dirs);
+
+ return r;
+
+fail:
+ strv_free(r);
+ r = NULL;
+ goto finish;
+}
+
+static int manager_find_paths(Manager *m) {
+ const char *e;
+ char *t;
+
+ assert(m);
+
+ /* First priority is whatever has been passed to us via env
+ * vars */
+ if ((e = getenv("SYSTEMD_UNIT_PATH")))
+ if (!(m->unit_path = split_path_and_make_absolute(e)))
+ return -ENOMEM;
+
+ if (strv_isempty(m->unit_path)) {
+
+ /* Nothing is set, so let's figure something out. */
+ strv_free(m->unit_path);
+
+ if (m->running_as == MANAGER_SESSION) {
+ if (!(m->unit_path = session_dirs()))
+ return -ENOMEM;
+ } else
+ if (!(m->unit_path = strv_new(
+ SYSTEM_CONFIG_UNIT_PATH, /* /etc/systemd/system/ */
+ SYSTEM_DATA_UNIT_PATH, /* /lib/systemd/system/ */
+ NULL)))
+ return -ENOMEM;
+ }
+
+ if (m->running_as == MANAGER_INIT) {
+ /* /etc/init.d/ compativility does not matter to users */
+
+ if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
+ if (!(m->sysvinit_path = split_path_and_make_absolute(e)))
+ return -ENOMEM;
+
+ if (strv_isempty(m->sysvinit_path)) {
+ strv_free(m->sysvinit_path);
+
+ if (!(m->sysvinit_path = strv_new(
+ SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
+ NULL)))
+ return -ENOMEM;
+ }
+
+ if ((e = getenv("SYSTEMD_SYSVRCND_PATH")))
+ if (!(m->sysvrcnd_path = split_path_and_make_absolute(e)))
+ return -ENOMEM;
-Manager* manager_new(void) {
+ if (strv_isempty(m->sysvrcnd_path)) {
+ strv_free(m->sysvrcnd_path);
+
+ if (!(m->sysvrcnd_path = strv_new(
+ SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */
+ NULL)))
+ return -ENOMEM;
+ }
+ }
+
+ strv_uniq(m->unit_path);
+ strv_uniq(m->sysvinit_path);
+ strv_uniq(m->sysvrcnd_path);
+
+ assert(!strv_isempty(m->unit_path));
+ if (!(t = strv_join(m->unit_path, "\n\t")))
+ return -ENOMEM;
+ log_debug("Looking for unit files in:\n\t%s", t);
+ free(t);
+
+ if (!strv_isempty(m->sysvinit_path)) {
+
+ if (!(t = strv_join(m->sysvinit_path, "\n\t")))
+ return -ENOMEM;
+
+ log_debug("Looking for SysV init scripts in:\n\t%s", t);
+ free(t);
+ } else
+ log_debug("Ignoring SysV init scripts.");
+
+ if (!strv_isempty(m->sysvrcnd_path)) {
+
+ if (!(t = strv_join(m->sysvrcnd_path, "\n\t")))
+ return -ENOMEM;
+
+ log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
+ free(t);
+ } else
+ log_debug("Ignoring SysV rcN.d links.");
+
+ return 0;
+}
+
+int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **_m) {
Manager *m;
+ int r = -ENOMEM;
+
+ assert(_m);
+ assert(running_as >= 0);
+ assert(running_as < _MANAGER_RUNNING_AS_MAX);
if (!(m = new0(Manager, 1)))
- return NULL;
+ return -ENOMEM;
+
+ m->boot_timestamp = now(CLOCK_REALTIME);
- if (!(m->names = hashmap_new(string_hash_func, string_compare_func)))
+ m->running_as = running_as;
+ m->confirm_spawn = confirm_spawn;
+ m->name_data_slot = -1;
+
+ m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = -1;
+ m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
+
+ if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
goto fail;
if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
@@ -25,45 +336,195 @@ Manager* manager_new(void) {
if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
goto fail;
- return m;
+ if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
+ goto fail;
+
+ if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
+ goto fail;
+
+ if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
+ goto fail;
+
+ if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
+ goto fail;
+
+ if ((r = manager_find_paths(m)) < 0)
+ goto fail;
+
+ if ((r = manager_setup_signals(m)) < 0)
+ goto fail;
+
+ if ((r = manager_setup_cgroup(m)) < 0)
+ goto fail;
+
+ /* Try to connect to the busses, if possible. */
+ if ((r = bus_init_system(m)) < 0 ||
+ (r = bus_init_api(m)) < 0)
+ goto fail;
+
+ *_m = m;
+ return 0;
fail:
manager_free(m);
- return NULL;
+ return r;
+}
+
+static unsigned manager_dispatch_cleanup_queue(Manager *m) {
+ Meta *meta;
+ unsigned n = 0;
+
+ assert(m);
+
+ while ((meta = m->cleanup_queue)) {
+ assert(meta->in_cleanup_queue);
+
+ unit_free(UNIT(meta));
+ n++;
+ }
+
+ return n;
}
void manager_free(Manager *m) {
- Name *n;
+ UnitType c;
+ Unit *u;
Job *j;
assert(m);
- while ((n = hashmap_first(m->names)))
- name_free(n);
-
- while ((j = hashmap_steal_first(m->transaction_jobs)))
+ while ((j = hashmap_first(m->transaction_jobs)))
job_free(j);
- hashmap_free(m->names);
+ while ((u = hashmap_first(m->units)))
+ unit_free(u);
+
+ manager_dispatch_cleanup_queue(m);
+
+ for (c = 0; c < _UNIT_TYPE_MAX; c++)
+ if (unit_vtable[c]->shutdown)
+ unit_vtable[c]->shutdown(m);
+
+ manager_shutdown_cgroup(m);
+
+ bus_done_api(m);
+ bus_done_system(m);
+
+ hashmap_free(m->units);
hashmap_free(m->jobs);
hashmap_free(m->transaction_jobs);
+ hashmap_free(m->watch_pids);
+ hashmap_free(m->watch_bus);
+
+ if (m->epoll_fd >= 0)
+ close_nointr(m->epoll_fd);
+ if (m->signal_watch.fd >= 0)
+ close_nointr(m->signal_watch.fd);
+
+ strv_free(m->unit_path);
+ strv_free(m->sysvinit_path);
+ strv_free(m->sysvrcnd_path);
+
+ free(m->cgroup_controller);
+ free(m->cgroup_hierarchy);
+
+ assert(hashmap_isempty(m->cgroup_bondings));
+ hashmap_free(m->cgroup_bondings);
free(m);
}
+int manager_coldplug(Manager *m) {
+ int r;
+ UnitType c;
+ Iterator i;
+ Unit *u;
+ char *k;
+
+ assert(m);
+
+ /* First, let's ask every type to load all units from
+ * disk/kernel that it might know */
+ for (c = 0; c < _UNIT_TYPE_MAX; c++)
+ if (unit_vtable[c]->enumerate)
+ if ((r = unit_vtable[c]->enumerate(m)) < 0)
+ return r;
+
+ manager_dispatch_load_queue(m);
+
+ /* Then, let's set up their initial state. */
+ HASHMAP_FOREACH_KEY(u, k, m->units, i) {
+
+ /* ignore aliases */
+ if (u->meta.id != k)
+ continue;
+
+ if (UNIT_VTABLE(u)->coldplug)
+ if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
+ return r;
+ }
+
+ /* Now that the initial devices are available, let's see if we
+ * can write the utmp file */
+ manager_write_utmp_reboot(m);
+
+ return 0;
+}
+
+static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
+ assert(m);
+ assert(j);
+
+ /* Deletes one job from the transaction */
+
+ manager_transaction_unlink_job(m, j, delete_dependencies);
+
+ if (!j->installed)
+ job_free(j);
+}
+
+static void transaction_delete_unit(Manager *m, Unit *u) {
+ Job *j;
+
+ /* Deletes all jobs associated with a certain unit from the
+ * transaction */
+
+ while ((j = hashmap_get(m->transaction_jobs, u)))
+ transaction_delete_job(m, j, true);
+}
+
+static void transaction_clean_dependencies(Manager *m) {
+ Iterator i;
+ Job *j;
+
+ assert(m);
+
+ /* Drops all dependencies of all installed jobs */
+
+ HASHMAP_FOREACH(j, m->jobs, i) {
+ while (j->subject_list)
+ job_dependency_free(j->subject_list);
+ while (j->object_list)
+ job_dependency_free(j->object_list);
+ }
+
+ assert(!m->transaction_anchor);
+}
+
static void transaction_abort(Manager *m) {
Job *j;
assert(m);
while ((j = hashmap_first(m->transaction_jobs)))
- if (j->linked)
- manager_transaction_delete_job(m, j);
+ if (j->installed)
+ transaction_delete_job(m, j, true);
else
job_free(j);
assert(hashmap_isempty(m->transaction_jobs));
- assert(!m->transaction_anchor);
+
+ transaction_clean_dependencies(m);
}
static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
@@ -71,13 +532,23 @@ static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsi
assert(m);
- for (l = j ? j->subject_list : m->transaction_anchor; l; l = l->subject_next) {
+ /* A recursive sweep through the graph that marks all units
+ * that matter to the anchor job, i.e. are directly or
+ * indirectly a dependency of the anchor job via paths that
+ * are fully marked as mattering. */
+
+ if (j)
+ l = j->subject_list;
+ else
+ l = m->transaction_anchor;
+
+ LIST_FOREACH(subject, l, l) {
/* This link does not matter */
if (!l->matters)
continue;
- /* This name has already been marked */
+ /* This unit has already been marked */
if (l->object->generation == generation)
continue;
@@ -88,56 +559,25 @@ static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsi
}
}
-static bool types_match(JobType a, JobType b, JobType c, JobType d) {
- return
- (a == c && b == d) ||
- (a == d && b == c);
-}
-
-static int types_merge(JobType *a, JobType b) {
- if (*a == b)
- return 0;
-
- if (types_match(*a, b, JOB_START, JOB_VERIFY_STARTED))
- *a = JOB_START;
- else if (types_match(*a, b, JOB_START, JOB_RELOAD) ||
- types_match(*a, b, JOB_START, JOB_RELOAD_OR_START) ||
- types_match(*a, b, JOB_VERIFY_STARTED, JOB_RELOAD_OR_START) ||
- types_match(*a, b, JOB_RELOAD, JOB_RELOAD_OR_START))
- *a = JOB_RELOAD_OR_START;
- else if (types_match(*a, b, JOB_START, JOB_RESTART) ||
- types_match(*a, b, JOB_START, JOB_TRY_RESTART) ||
- types_match(*a, b, JOB_VERIFY_STARTED, JOB_RESTART) ||
- types_match(*a, b, JOB_RELOAD, JOB_RESTART) ||
- types_match(*a, b, JOB_RELOAD_OR_START, JOB_RESTART) ||
- types_match(*a, b, JOB_RELOAD_OR_START, JOB_TRY_RESTART) ||
- types_match(*a, b, JOB_RESTART, JOB_TRY_RESTART))
- *a = JOB_RESTART;
- else if (types_match(*a, b, JOB_VERIFY_STARTED, JOB_RELOAD))
- *a = JOB_RELOAD;
- else if (types_match(*a, b, JOB_VERIFY_STARTED, JOB_TRY_RESTART) ||
- types_match(*a, b, JOB_RELOAD, JOB_TRY_RESTART))
- *a = JOB_TRY_RESTART;
-
- return -EEXIST;
-}
-
-static void manager_merge_and_delete_prospective_job(Manager *m, Job *j, Job *other, JobType t) {
+static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
JobDependency *l, *last;
assert(j);
assert(other);
- assert(j->name == other->name);
- assert(!j->linked);
+ assert(j->unit == other->unit);
+ assert(!j->installed);
+
+ /* Merges 'other' into 'j' and then deletes j. */
j->type = t;
j->state = JOB_WAITING;
+ j->override = j->override || other->override;
j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
/* Patch us in as new owner of the JobDependency objects */
last = NULL;
- for (l = other->subject_list; l; l = l->subject_next) {
+ LIST_FOREACH(subject, l, other->subject_list) {
assert(l->subject == other);
l->subject = j;
last = l;
@@ -153,7 +593,7 @@ static void manager_merge_and_delete_prospective_job(Manager *m, Job *j, Job *ot
/* Patch us in as new owner of the JobDependency objects */
last = NULL;
- for (l = other->object_list; l; l = l->object_next) {
+ LIST_FOREACH(object, l, other->object_list) {
assert(l->object == other);
l->object = j;
last = l;
@@ -167,145 +607,281 @@ static void manager_merge_and_delete_prospective_job(Manager *m, Job *j, Job *ot
j->object_list = other->object_list;
}
-
/* Kill the other job */
other->subject_list = NULL;
other->object_list = NULL;
- manager_transaction_delete_job(m, other);
+ transaction_delete_job(m, other, true);
+}
+
+static int delete_one_unmergeable_job(Manager *m, Job *j) {
+ Job *k;
+
+ assert(j);
+
+ /* Tries to delete one item in the linked list
+ * j->transaction_next->transaction_next->... that conflicts
+ * whith another one, in an attempt to make an inconsistent
+ * transaction work. */
+
+ /* We rely here on the fact that if a merged with b does not
+ * merge with c, either a or b merge with c neither */
+ LIST_FOREACH(transaction, j, j)
+ LIST_FOREACH(transaction, k, j->transaction_next) {
+ Job *d;
+
+ /* Is this one mergeable? Then skip it */
+ if (job_type_is_mergeable(j->type, k->type))
+ continue;
+
+ /* Ok, we found two that conflict, let's see if we can
+ * drop one of them */
+ if (!j->matters_to_anchor)
+ d = j;
+ else if (!k->matters_to_anchor)
+ d = k;
+ else
+ return -ENOEXEC;
+
+ /* Ok, we can drop one, so let's do so. */
+ log_debug("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
+ transaction_delete_job(m, d, true);
+ return 0;
+ }
+
+ return -EINVAL;
}
static int transaction_merge_jobs(Manager *m) {
Job *j;
- void *state;
+ Iterator i;
int r;
assert(m);
- HASHMAP_FOREACH(j, m->transaction_jobs, state) {
+ /* First step, check whether any of the jobs for one specific
+ * task conflict. If so, try to drop one of them. */
+ HASHMAP_FOREACH(j, m->transaction_jobs, i) {
+ JobType t;
+ Job *k;
+
+ t = j->type;
+ LIST_FOREACH(transaction, k, j->transaction_next) {
+ if ((r = job_type_merge(&t, k->type)) >= 0)
+ continue;
+
+ /* OK, we could not merge all jobs for this
+ * action. Let's see if we can get rid of one
+ * of them */
+
+ if ((r = delete_one_unmergeable_job(m, j)) >= 0)
+ /* Ok, we managed to drop one, now
+ * let's ask our callers to call us
+ * again after garbage collecting */
+ return -EAGAIN;
+
+ /* We couldn't merge anything. Failure */
+ return r;
+ }
+ }
+
+ /* Second step, merge the jobs. */
+ HASHMAP_FOREACH(j, m->transaction_jobs, i) {
JobType t = j->type;
Job *k;
- for (k = j->transaction_next; k; k = k->transaction_next)
- if ((r = types_merge(&t, k->type)) < 0)
- return r;
+ /* Merge all transactions */
+ LIST_FOREACH(transaction, k, j->transaction_next)
+ assert_se(job_type_merge(&t, k->type) == 0);
+
+ /* If an active job is mergeable, merge it too */
+ if (j->unit->meta.job)
+ job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
while ((k = j->transaction_next)) {
- if (j->linked) {
- manager_merge_and_delete_prospective_job(m, k, j, t);
+ if (j->installed) {
+ transaction_merge_and_delete_job(m, k, j, t);
j = k;
} else
- manager_merge_and_delete_prospective_job(m, j, k, t);
+ transaction_merge_and_delete_job(m, j, k, t);
}
assert(!j->transaction_next);
assert(!j->transaction_prev);
}
- return r;
+ return 0;
+}
+
+static void transaction_drop_redundant(Manager *m) {
+ bool again;
+
+ assert(m);
+
+ /* Goes through the transaction and removes all jobs that are
+ * a noop */
+
+ do {
+ Job *j;
+ Iterator i;
+
+ again = false;
+
+ HASHMAP_FOREACH(j, m->transaction_jobs, i) {
+ bool changes_something = false;
+ Job *k;
+
+ LIST_FOREACH(transaction, k, j) {
+
+ if (!job_is_anchor(k) &&
+ job_type_is_redundant(k->type, unit_active_state(k->unit)))
+ continue;
+
+ changes_something = true;
+ break;
+ }
+
+ if (changes_something)
+ continue;
+
+ log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type));
+ transaction_delete_job(m, j, false);
+ again = true;
+ break;
+ }
+
+ } while (again);
+}
+
+static bool unit_matters_to_anchor(Unit *u, Job *j) {
+ assert(u);
+ assert(!j->transaction_prev);
+
+ /* Checks whether at least one of the jobs for this unit
+ * matters to the anchor. */
+
+ LIST_FOREACH(transaction, j, j)
+ if (j->matters_to_anchor)
+ return true;
+
+ return false;
}
static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) {
- void *state;
- Name *n;
+ Iterator i;
+ Unit *u;
int r;
assert(m);
assert(j);
+ assert(!j->transaction_prev);
+
+ /* Does a recursive sweep through the ordering graph, looking
+ * for a cycle. If we find cycle we try to break it. */
- /* Did we find a loop? */
+ /* Did we find a cycle? */
if (j->marker && j->generation == generation) {
Job *k;
/* So, we already have been here. We have a
- * loop. Let's try to break it. We go backwards in our
- * path and try to find a suitable job to remove. */
+ * cycle. Let's try to break it. We go backwards in
+ * our path and try to find a suitable job to
+ * remove. We use the marker to find our way back,
+ * since smart how we are we stored our way back in
+ * there. */
+
+ log_debug("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) {
- if (!k->matters_to_anchor) {
- manager_transaction_delete_job(m, k);
+
+ log_debug("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
+
+ if (!k->installed &&
+ !unit_matters_to_anchor(k->unit, k)) {
+ /* Ok, we can drop this one, so let's
+ * do so. */
+ log_debug("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type));
+ transaction_delete_unit(m, k->unit);
return -EAGAIN;
}
/* Check if this in fact was the beginning of
- * the loop */
+ * the cycle */
if (k == j)
break;
}
- return -ELOOP;
+ log_debug("Unable to break cycle");
+
+ return -ENOEXEC;
}
+ /* Make the marker point to where we come from, so that we can
+ * find our way backwards if we want to break a cycle */
j->marker = from;
j->generation = generation;
- /* We assume that the the dependencies are both-ways, and
- * hence can ignore NAME_AFTER */
-
- SET_FOREACH(n, j->name->meta.dependencies[NAME_BEFORE], state) {
+ /* We assume that the the dependencies are bidirectional, and
+ * hence can ignore UNIT_AFTER */
+ SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
Job *o;
- if (!(o = hashmap_get(m->transaction_jobs, n)))
- if (!(o = n->meta.job))
+ /* Is there a job for this unit? */
+ if (!(o = hashmap_get(m->transaction_jobs, u)))
+
+ /* Ok, there is no job for this in the
+ * transaction, but maybe there is already one
+ * running? */
+ if (!(o = u->meta.job))
continue;
if ((r = transaction_verify_order_one(m, o, j, generation)) < 0)
return r;
}
+ /* Ok, let's backtrack, and remember that this entry is not on
+ * our path anymore. */
+ j->marker = NULL;
+
return 0;
}
static int transaction_verify_order(Manager *m, unsigned *generation) {
- bool again;
+ Job *j;
+ int r;
+ Iterator i;
+
assert(m);
assert(generation);
- do {
- Job *j;
- int r;
- void *state;
+ /* Check if the ordering graph is cyclic. If it is, try to fix
+ * that up by dropping one of the jobs. */
- again = false;
+ HASHMAP_FOREACH(j, m->transaction_jobs, i)
+ if ((r = transaction_verify_order_one(m, j, NULL, (*generation)++)) < 0)
+ return r;
- HASHMAP_FOREACH(j, m->transaction_jobs, state) {
+ return 0;
+}
- /* Assume merged */
- assert(!j->transaction_next);
- assert(!j->transaction_prev);
-
- if ((r = transaction_verify_order_one(m, j, NULL, (*generation)++)) < 0) {
-
- /* There was a loop, but it was fixed,
- * we need to restart our algorithm */
- if (r == -EAGAIN) {
- again = true;
- break;
- }
-
- return r;
- }
- }
- } while (again);
-
- return 0;
-}
-
-static void transaction_collect_garbage(Manager *m) {
- bool again;
+static void transaction_collect_garbage(Manager *m) {
+ bool again;
assert(m);
+ /* Drop jobs that are not required by any other job */
+
do {
- void *state;
+ Iterator i;
Job *j;
again = false;
- HASHMAP_FOREACH(j, m->transaction_jobs, state) {
+ HASHMAP_FOREACH(j, m->transaction_jobs, i) {
if (j->object_list)
continue;
- manager_transaction_delete_job(m, j);
+ log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
+ transaction_delete_job(m, j, true);
again = true;
break;
}
@@ -314,7 +890,7 @@ static void transaction_collect_garbage(Manager *m) {
}
static int transaction_is_destructive(Manager *m, JobMode mode) {
- void *state;
+ Iterator i;
Job *j;
assert(m);
@@ -322,20 +898,89 @@ static int transaction_is_destructive(Manager *m, JobMode mode) {
/* Checks whether applying this transaction means that
* existing jobs would be replaced */
- HASHMAP_FOREACH(j, m->transaction_jobs, state)
- if (j->name->meta.job && j->name->meta.job != j)
+ HASHMAP_FOREACH(j, m->transaction_jobs, i) {
+
+ /* Assume merged */
+ assert(!j->transaction_prev);
+ assert(!j->transaction_next);
+
+ if (j->unit->meta.job &&
+ j->unit->meta.job != j &&
+ !job_type_is_superset(j->type, j->unit->meta.job->type))
return -EEXIST;
+ }
return 0;
}
+static void transaction_minimize_impact(Manager *m) {
+ bool again;
+ assert(m);
+
+ /* Drops all unnecessary jobs that reverse already active jobs
+ * or that stop a running service. */
+
+ do {
+ Job *j;
+ Iterator i;
+
+ again = false;
+
+ HASHMAP_FOREACH(j, m->transaction_jobs, i) {
+ LIST_FOREACH(transaction, j, j) {
+ bool stops_running_service, changes_existing_job;
+
+ /* If it matters, we shouldn't drop it */
+ if (j->matters_to_anchor)
+ continue;
+
+ /* Would this stop a running service?
+ * Would this change an existing job?
+ * If so, let's drop this entry */
+
+ stops_running_service =
+ j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
+
+ changes_existing_job =
+ j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
+
+ if (!stops_running_service && !changes_existing_job)
+ continue;
+
+ if (stops_running_service)
+ log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
+
+ if (changes_existing_job)
+ log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
+
+ /* Ok, let's get rid of this */
+ log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
+
+ transaction_delete_job(m, j, true);
+ again = true;
+ break;
+ }
+
+ if (again)
+ break;
+ }
+
+ } while (again);
+}
+
static int transaction_apply(Manager *m, JobMode mode) {
- void *state;
+ Iterator i;
Job *j;
int r;
- HASHMAP_FOREACH(j, m->transaction_jobs, state) {
- if (j->linked)
+ /* Moves the transaction jobs to the set of active jobs */
+
+ HASHMAP_FOREACH(j, m->transaction_jobs, i) {
+ /* Assume merged */
+ assert(!j->transaction_prev);
+ assert(!j->transaction_next);
+
+ if (j->installed)
continue;
if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
@@ -343,14 +988,14 @@ static int transaction_apply(Manager *m, JobMode mode) {
}
while ((j = hashmap_steal_first(m->transaction_jobs))) {
- if (j->linked)
+ if (j->installed)
continue;
- if (j->name->meta.job)
- job_free(j->name->meta.job);
+ if (j->unit->meta.job)
+ job_free(j->unit->meta.job);
- j->name->meta.job = j;
- j->linked = true;
+ j->unit->meta.job = j;
+ j->installed = true;
/* We're fully installed. Now let's free data we don't
* need anymore. */
@@ -358,18 +1003,19 @@ static int transaction_apply(Manager *m, JobMode mode) {
assert(!j->transaction_next);
assert(!j->transaction_prev);
- while (j->subject_list)
- job_dependency_free(j->subject_list);
- while (j->object_list)
- job_dependency_free(j->object_list);
+ job_add_to_run_queue(j);
+ job_add_to_dbus_queue(j);
}
+ /* As last step, kill all remaining job dependencies. */
+ transaction_clean_dependencies(m);
+
return 0;
rollback:
- HASHMAP_FOREACH(j, m->transaction_jobs, state) {
- if (j->linked)
+ HASHMAP_FOREACH(j, m->transaction_jobs, i) {
+ if (j->installed)
continue;
hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
@@ -378,7 +1024,6 @@ rollback:
return r;
}
-
static int transaction_activate(Manager *m, JobMode mode) {
int r;
unsigned generation = 1;
@@ -391,25 +1036,68 @@ static int transaction_activate(Manager *m, JobMode mode) {
/* First step: figure out which jobs matter */
transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
- /* Second step: let's merge entries we can merge */
- if ((r = transaction_merge_jobs(m)) < 0)
- goto rollback;
+ /* Second step: Try not to stop any running services if
+ * we don't have to. Don't try to reverse running
+ * jobs if we don't have to. */
+ transaction_minimize_impact(m);
- /* Third step: verify order makes sense */
- if ((r = transaction_verify_order(m, &generation)) < 0)
- goto rollback;
+ /* Third step: Drop redundant jobs */
+ transaction_drop_redundant(m);
+
+ for (;;) {
+ /* Fourth step: Let's remove unneeded jobs that might
+ * be lurking. */
+ transaction_collect_garbage(m);
+
+ /* Fifth step: verify order makes sense and correct
+ * cycles if necessary and possible */
+ if ((r = transaction_verify_order(m, &generation)) >= 0)
+ break;
- /* Third step: do garbage colletion */
- transaction_collect_garbage(m);
+ if (r != -EAGAIN) {
+ log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
+ goto rollback;
+ }
- /* Fourth step: check whether we can actually apply this */
+ /* Let's see if the resulting transaction ordering
+ * graph is still cyclic... */
+ }
+
+ for (;;) {
+ /* Sixth step: let's drop unmergeable entries if
+ * necessary and possible, merge entries we can
+ * merge */
+ if ((r = transaction_merge_jobs(m)) >= 0)
+ break;
+
+ if (r != -EAGAIN) {
+ log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r));
+ goto rollback;
+ }
+
+ /* Seventh step: an entry got dropped, let's garbage
+ * collect its dependencies. */
+ transaction_collect_garbage(m);
+
+ /* Let's see if the resulting transaction still has
+ * unmergeable entries ... */
+ }
+
+ /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
+ transaction_drop_redundant(m);
+
+ /* Ninth step: check whether we can actually apply this */
if (mode == JOB_FAIL)
- if ((r = transaction_is_destructive(m, mode)) < 0)
+ if ((r = transaction_is_destructive(m, mode)) < 0) {
+ log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r));
goto rollback;
+ }
- /* Fifth step: apply changes */
- if ((r = transaction_apply(m, mode)) < 0)
+ /* Tenth step: apply changes */
+ if ((r = transaction_apply(m, mode)) < 0) {
+ log_debug("Failed to apply transaction: %s", strerror(-r));
goto rollback;
+ }
assert(hashmap_isempty(m->transaction_jobs));
assert(!m->transaction_anchor);
@@ -421,21 +1109,21 @@ rollback:
return r;
}
-static Job* transaction_add_one_job(Manager *m, JobType type, Name *name, bool *is_new) {
+static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
Job *j, *f;
int r;
assert(m);
- assert(name);
+ assert(unit);
/* Looks for an axisting prospective job and returns that. If
* it doesn't exist it is created and added to the prospective
* jobs list. */
- f = hashmap_get(m->transaction_jobs, name);
+ f = hashmap_get(m->transaction_jobs, unit);
- for (j = f; j; j = j->transaction_next) {
- assert(j->name == name);
+ LIST_FOREACH(transaction, j, f) {
+ assert(j->unit == unit);
if (j->type == type) {
if (is_new)
@@ -444,41 +1132,41 @@ static Job* transaction_add_one_job(Manager *m, JobType type, Name *name, bool *
}
}
- if (name->meta.job && name->meta.job->type == type)
- j = name->meta.job;
- else if (!(j = job_new(m, type, name)))
- return NULL;
-
- if ((r = hashmap_replace(m->transaction_jobs, name, j)) < 0) {
- job_free(j);
+ if (unit->meta.job && unit->meta.job->type == type)
+ j = unit->meta.job;
+ else if (!(j = job_new(m, type, unit)))
return NULL;
- }
-
- j->transaction_next = f;
-
- if (f)
- f->transaction_prev = j;
j->generation = 0;
j->marker = NULL;
j->matters_to_anchor = false;
+ j->override = override;
+
+ LIST_PREPEND(Job, transaction, f, j);
+
+ if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
+ job_free(j);
+ return NULL;
+ }
if (is_new)
*is_new = true;
+ log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
+
return j;
}
-void manager_transaction_delete_job(Manager *m, Job *j) {
+void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
assert(m);
assert(j);
if (j->transaction_prev)
j->transaction_prev->transaction_next = j->transaction_next;
else if (j->transaction_next)
- hashmap_replace(m->transaction_jobs, j->name, j->transaction_next);
+ hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
else
- hashmap_remove_value(m->transaction_jobs, j->name, j);
+ hashmap_remove_value(m->transaction_jobs, j->unit, j);
if (j->transaction_next)
j->transaction_next->transaction_prev = j->transaction_prev;
@@ -487,23 +1175,47 @@ void manager_transaction_delete_job(Manager *m, Job *j) {
while (j->subject_list)
job_dependency_free(j->subject_list);
- while (j->object_list)
+
+ while (j->object_list) {
+ Job *other = j->object_list->matters ? j->object_list->subject : NULL;
+
job_dependency_free(j->object_list);
+
+ if (other && delete_dependencies) {
+ log_debug("Deleting job %s/%s as dependency of job %s/%s",
+ other->unit->meta.id, job_type_to_string(other->type),
+ j->unit->meta.id, job_type_to_string(j->type));
+ transaction_delete_job(m, other, delete_dependencies);
+ }
+ }
}
-static int transaction_add_job_and_dependencies(Manager *m, JobType type, Name *name, Job *by, bool matters, bool force, Job **_ret) {
+static int transaction_add_job_and_dependencies(
+ Manager *m,
+ JobType type,
+ Unit *unit,
+ Job *by,
+ bool matters,
+ bool override,
+ Job **_ret) {
Job *ret;
- void *state;
- Name *dep;
+ Iterator i;
+ Unit *dep;
int r;
bool is_new;
assert(m);
assert(type < _JOB_TYPE_MAX);
- assert(name);
+ assert(unit);
+
+ if (unit->meta.load_state != UNIT_LOADED)
+ return -EINVAL;
+
+ if (!unit_job_is_applicable(unit, type))
+ return -EBADR;
/* First add the job. */
- if (!(ret = transaction_add_one_job(m, type, name, &is_new)))
+ if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
return -ENOMEM;
/* Then, add a link to the job. */
@@ -513,51 +1225,61 @@ static int transaction_add_job_and_dependencies(Manager *m, JobType type, Name *
if (is_new) {
/* Finally, recursively add in all dependencies. */
if (type == JOB_START || type == JOB_RELOAD_OR_START) {
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUIRES], state)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, force, NULL)) < 0)
- goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUIRES], state)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !force, force, NULL)) < 0)
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_WANTS], state)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, force, NULL)) < 0)
- goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUISITE], state)
- if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_STARTED, dep, ret, true, force, NULL)) < 0)
- goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUISITE], state)
- if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_STARTED, dep, ret, !force, force, NULL)) < 0)
+
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
+ log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
+
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, NULL)) < 0)
+ log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
+
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_CONFLICTS], state)
- if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, force, NULL)) < 0)
+
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
+ log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
+
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
goto fail;
} else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUIRED_BY], state)
- if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, force, NULL)) < 0)
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
+ if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
goto fail;
}
/* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
}
+ if (_ret)
+ *_ret = ret;
+
return 0;
fail:
return r;
}
-int manager_add_job(Manager *m, JobType type, Name *name, JobMode mode, bool force, Job **_ret) {
+int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) {
int r;
Job *ret;
assert(m);
assert(type < _JOB_TYPE_MAX);
- assert(name);
+ assert(unit);
assert(mode < _JOB_MODE_MAX);
- if ((r = transaction_add_job_and_dependencies(m, type, name, NULL, true, force, &ret))) {
+ log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
+
+ if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &ret)) < 0) {
transaction_abort(m);
return r;
}
@@ -565,239 +1287,630 @@ int manager_add_job(Manager *m, JobType type, Name *name, JobMode mode, bool for
if ((r = transaction_activate(m, mode)) < 0)
return r;
+ log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
+
if (_ret)
*_ret = ret;
return 0;
}
+int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, Job **_ret) {
+ Unit *unit;
+ int r;
+
+ assert(m);
+ assert(type < _JOB_TYPE_MAX);
+ assert(name);
+ assert(mode < _JOB_MODE_MAX);
+
+ if ((r = manager_load_unit(m, name, NULL, &unit)) < 0)
+ return r;
+
+ return manager_add_job(m, type, unit, mode, override, _ret);
+}
+
Job *manager_get_job(Manager *m, uint32_t id) {
assert(m);
return hashmap_get(m->jobs, UINT32_TO_PTR(id));
}
-Name *manager_get_name(Manager *m, const char *name) {
+Unit *manager_get_unit(Manager *m, const char *name) {
assert(m);
assert(name);
- return hashmap_get(m->names, name);
+ return hashmap_get(m->units, name);
}
-static int verify_type(Name *name) {
- char *n;
- void *state;
+unsigned manager_dispatch_load_queue(Manager *m) {
+ Meta *meta;
+ unsigned n = 0;
- assert(name);
+ assert(m);
- /* Checks that all aliases of this name have the same and valid type */
+ /* Make sure we are not run recursively */
+ if (m->dispatching_load_queue)
+ return 0;
- SET_FOREACH(n, name->meta.names, state) {
- NameType t;
+ m->dispatching_load_queue = true;
- if ((t = name_type_from_string(n)) == _NAME_TYPE_INVALID)
- return -EINVAL;
+ /* Dispatches the load queue. Takes a unit from the queue and
+ * tries to load its data until the queue is empty */
- if (name->meta.type == _NAME_TYPE_INVALID) {
- name->meta.type = t;
- continue;
- }
+ while ((meta = m->load_queue)) {
+ assert(meta->in_load_queue);
- if (name->meta.type != t)
- return -EINVAL;
+ unit_load(UNIT(meta));
+ n++;
}
- if (name->meta.type == _NAME_TYPE_INVALID)
+ m->dispatching_load_queue = false;
+ return n;
+}
+
+int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) {
+ Unit *ret;
+ int r;
+
+ assert(m);
+ assert(name || path);
+
+ /* This will load the service information files, but not actually
+ * start any services or anything. */
+
+ if (path && !is_path(path))
+ return -EINVAL;
+
+ if (!name)
+ name = file_name_from_path(path);
+
+ if (!unit_name_is_valid(name))
return -EINVAL;
+ if ((ret = manager_get_unit(m, name))) {
+ *_ret = ret;
+ return 0;
+ }
+
+ if (!(ret = unit_new(m)))
+ return -ENOMEM;
+
+ if (path)
+ if (!(ret->meta.fragment_path = strdup(path))) {
+ unit_free(ret);
+ return -ENOMEM;
+ }
+
+ if ((r = unit_add_name(ret, name)) < 0) {
+ unit_free(ret);
+ return r;
+ }
+
+ unit_add_to_load_queue(ret);
+ unit_add_to_dbus_queue(ret);
+
+ manager_dispatch_load_queue(m);
+
+ if (_ret)
+ *_ret = unit_follow_merge(ret);
+
return 0;
}
-static int service_load_sysv(Service *s) {
+void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
+ Iterator i;
+ Job *j;
+
assert(s);
+ assert(f);
+
+ HASHMAP_FOREACH(j, s->jobs, i)
+ job_dump(j, f, prefix);
+}
- /* Load service data from SysV init scripts, preferably with
- * LSB headers ... */
+void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
+ Iterator i;
+ Unit *u;
+ const char *t;
- return 0;
+ assert(s);
+ assert(f);
+
+ HASHMAP_FOREACH_KEY(u, t, s->units, i)
+ if (u->meta.id == t)
+ unit_dump(u, f, prefix);
}
-static int name_load_fstab(Name *n) {
- assert(n);
- assert(n->meta.type == NAME_MOUNT || n->meta.type == NAME_AUTOMOUNT);
+void manager_clear_jobs(Manager *m) {
+ Job *j;
- /* Load mount data from /etc/fstab */
+ assert(m);
- return 0;
+ transaction_abort(m);
+
+ while ((j = hashmap_first(m->jobs)))
+ job_free(j);
}
-static int snapshot_load(Snapshot *s) {
- assert(s);
+unsigned manager_dispatch_run_queue(Manager *m) {
+ Job *j;
+ unsigned n = 0;
+
+ if (m->dispatching_run_queue)
+ return 0;
- /* Load snapshots from disk */
+ m->dispatching_run_queue = true;
- return 0;
+ while ((j = m->run_queue)) {
+ assert(j->installed);
+ assert(j->in_run_queue);
+
+ job_run_and_invalidate(j);
+ n++;
+ }
+
+ m->dispatching_run_queue = false;
+ return n;
}
-static int name_load_dropin(Name *n) {
- assert(n);
+unsigned manager_dispatch_dbus_queue(Manager *m) {
+ Job *j;
+ Meta *meta;
+ unsigned n = 0;
+
+ assert(m);
+
+ if (m->dispatching_dbus_queue)
+ return 0;
+
+ m->dispatching_dbus_queue = true;
- /* Load dependencies from drop-in directories */
+ while ((meta = m->dbus_unit_queue)) {
+ assert(meta->in_dbus_queue);
+
+ bus_unit_send_change_signal(UNIT(meta));
+ n++;
+ }
+
+ while ((j = m->dbus_job_queue)) {
+ assert(j->in_dbus_queue);
+
+ bus_job_send_change_signal(j);
+ n++;
+ }
+
+ m->dispatching_dbus_queue = false;
+ return n;
+}
+
+static int manager_dispatch_sigchld(Manager *m) {
+ assert(m);
+
+ for (;;) {
+ siginfo_t si;
+ Unit *u;
+
+ zero(si);
+
+ /* First we call waitd() for a PID and do not reap the
+ * zombie. That way we can still access /proc/$PID for
+ * it while it is a zombie. */
+ if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
+
+ if (errno == ECHILD)
+ break;
+
+ if (errno == EINTR)
+ continue;
+
+ return -errno;
+ }
+
+ if (si.si_pid <= 0)
+ break;
+
+ if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
+ char *name = NULL;
+
+ get_process_name(si.si_pid, &name);
+ log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si.si_pid, strna(name));
+ free(name);
+ }
+
+ /* And now, we actually reap the zombie. */
+ if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
+ if (errno == EINTR)
+ continue;
+
+ return -errno;
+ }
+
+ if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
+ continue;
+
+ log_debug("Child %llu died (code=%s, status=%i/%s)",
+ (long long unsigned) si.si_pid,
+ sigchld_code_to_string(si.si_code),
+ si.si_status,
+ strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status) : strsignal(si.si_status)));
+
+ if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
+ continue;
+
+ log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id);
+
+ UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
+ }
return 0;
}
-static int load(Name *name) {
+static void manager_start_target(Manager *m, const char *name) {
int r;
- assert(name);
+ if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_REPLACE, true, NULL)) < 0)
+ log_error("Failed to enqueue %s job: %s", name, strerror(-r));
+}
- if (name->meta.state != NAME_STUB)
- return 0;
+static int manager_process_signal_fd(Manager *m, bool *quit) {
+ ssize_t n;
+ struct signalfd_siginfo sfsi;
+ bool sigchld = false;
- if ((r = verify_type(name)) < 0)
- return r;
+ assert(m);
- if (name->meta.type == NAME_SERVICE) {
+ for (;;) {
+ if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
- /* Load a .service file */
- if ((r = name_load_fragment(name)) == 0)
- goto finish;
+ if (n >= 0)
+ return -EIO;
- /* Load a classic init script */
- if (r == -ENOENT)
- if ((r = service_load_sysv(SERVICE(name))) == 0)
- goto finish;
+ if (errno == EAGAIN)
+ break;
- } else if (name->meta.type == NAME_MOUNT ||
- name->meta.type == NAME_AUTOMOUNT) {
+ return -errno;
+ }
- if ((r = name_load_fstab(name)) == 0)
- goto finish;
+ switch (sfsi.ssi_signo) {
- } else if (name->meta.type == NAME_SNAPSHOT) {
+ case SIGCHLD:
+ sigchld = true;
+ break;
- if ((r = snapshot_load(SNAPSHOT(name))) == 0)
- goto finish;
+ case SIGINT:
+ case SIGTERM:
- } else {
- if ((r = name_load_fragment(name)) == 0)
- goto finish;
- }
+ if (m->running_as == MANAGER_INIT) {
+ manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET);
+ break;
+ }
- name->meta.state = NAME_FAILED;
- return r;
+ *quit = true;
+ return 0;
-finish:
- if ((r = name_load_dropin(name)) < 0)
- return r;
+ case SIGWINCH:
- if ((r = name_link_names(name, true)) < 0)
- return r;
+ if (m->running_as == MANAGER_INIT)
+ manager_start_target(m, SPECIAL_KBREQUEST_TARGET);
+
+ /* This is a nop on non-init */
+ break;
+
+ case SIGPWR:
+ if (m->running_as == MANAGER_INIT)
+ manager_start_target(m, SPECIAL_SIGPWR_TARGET);
+
+ /* This is a nop on non-init */
+ break;
+
+ case SIGUSR1:
+ manager_dump_units(m, stdout, "\t");
+ manager_dump_jobs(m, stdout, "\t");
+ break;
+
+ case SIGUSR2: {
+ Unit *u;
+
+ u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
+
+ if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
+ log_info("Trying to reconnect to bus...");
+ bus_init_system(m);
+ bus_init_api(m);
+ }
+
+ if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
+ log_info("Loading D-Bus service...");
+ manager_start_target(m, SPECIAL_DBUS_SERVICE);
+ }
+
+ break;
+ }
+
+ default:
+ log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
+ }
+ }
+
+ if (sigchld)
+ return manager_dispatch_sigchld(m);
- name->meta.state = NAME_LOADED;
return 0;
}
-static int dispatch_load_queue(Manager *m) {
- Meta *meta;
+static int process_event(Manager *m, struct epoll_event *ev, bool *quit) {
+ int r;
+ Watch *w;
assert(m);
+ assert(ev);
- /* Make sure we are not run recursively */
- if (m->dispatching_load_queue)
- return 0;
+ assert(w = ev->data.ptr);
- m->dispatching_load_queue = true;
+ switch (w->type) {
- /* Dispatches the load queue. Takes a name from the queue and
- * tries to load its data until the queue is empty */
+ case WATCH_SIGNAL:
- while ((meta = m->load_queue)) {
- load(NAME(meta));
- LIST_REMOVE(Meta, m->load_queue, meta);
+ /* An incoming signal? */
+ if (ev->events != EPOLLIN)
+ return -EINVAL;
+
+ if ((r = manager_process_signal_fd(m, quit)) < 0)
+ return r;
+
+ break;
+
+ case WATCH_FD:
+
+ /* Some fd event, to be dispatched to the units */
+ UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
+ break;
+
+ case WATCH_TIMER: {
+ uint64_t v;
+ ssize_t k;
+
+ /* Some timer event, to be dispatched to the units */
+ if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
+
+ if (k < 0 && (errno == EINTR || errno == EAGAIN))
+ break;
+
+ return k < 0 ? -errno : -EIO;
+ }
+
+ UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
+ break;
}
- m->dispatching_load_queue = false;
+ case WATCH_MOUNT:
+ /* Some mount table change, intended for the mount subsystem */
+ mount_fd_event(m, ev->events);
+ break;
+
+ case WATCH_UDEV:
+ /* Some notification from udev, intended for the device subsystem */
+ device_fd_event(m, ev->events);
+ break;
+
+ case WATCH_DBUS_WATCH:
+ bus_watch_event(m, w, ev->events);
+ break;
+
+ case WATCH_DBUS_TIMEOUT:
+ bus_timeout_event(m, w, ev->events);
+ break;
+
+ default:
+ assert_not_reached("Unknown epoll event type.");
+ }
return 0;
}
-int manager_load_name(Manager *m, const char *name, Name **_ret) {
- Name *ret;
- NameType t;
+int manager_loop(Manager *m) {
int r;
+ bool quit = false;
+
+ RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
+
+ assert(m);
+
+ do {
+ struct epoll_event event;
+ int n;
+
+ if (!ratelimit_test(&rl)) {
+ /* Yay, something is going seriously wrong, pause a little */
+ log_warning("Looping too fast. Throttling execution a little.");
+ sleep(1);
+ }
+
+ if (manager_dispatch_cleanup_queue(m) > 0)
+ continue;
+
+ if (manager_dispatch_load_queue(m) > 0)
+ continue;
+
+ if (manager_dispatch_run_queue(m) > 0)
+ continue;
+
+ if (bus_dispatch(m) > 0)
+ continue;
+
+ if (manager_dispatch_dbus_queue(m) > 0)
+ continue;
+
+ if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
+
+ if (errno == -EINTR)
+ continue;
+
+ return -errno;
+ }
+
+ assert(n == 1);
+
+ if ((r = process_event(m, &event, &quit)) < 0)
+ return r;
+ } while (!quit);
+
+ return 0;
+}
+
+int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
char *n;
+ Unit *u;
assert(m);
- assert(name);
- assert(_ret);
+ assert(s);
+ assert(_u);
- if (!name_is_valid(name))
+ if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
return -EINVAL;
- /* This will load the service information files, but not actually
- * start any services or anything */
+ if (!(n = bus_path_unescape(s+31)))
+ return -ENOMEM;
- if ((ret = manager_get_name(m, name)))
- goto finish;
+ u = manager_get_unit(m, n);
+ free(n);
+
+ if (!u)
+ return -ENOENT;
+
+ *_u = u;
+
+ return 0;
+}
+
+int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
+ Job *j;
+ unsigned id;
+ int r;
+
+ assert(m);
+ assert(s);
+ assert(_j);
- if ((t = name_type_from_string(name)) == _NAME_TYPE_INVALID)
+ if (!startswith(s, "/org/freedesktop/systemd1/job/"))
return -EINVAL;
- if (!(ret = name_new(m)))
- return -ENOMEM;
+ if ((r = safe_atou(s + 30, &id)) < 0)
+ return r;
- ret->meta.type = t;
+ if (!(j = manager_get_job(m, id)))
+ return -ENOENT;
- if (!(n = strdup(name))) {
- name_free(ret);
- return -ENOMEM;
- }
+ *_j = j;
- if (set_put(ret->meta.names, n) < 0) {
- name_free(ret);
- free(n);
- return -ENOMEM;
+ return 0;
+}
+
+static bool manager_utmp_good(Manager *m) {
+ int r;
+
+ assert(m);
+
+ if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
+
+ if (r < 0)
+ log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
+
+ return false;
}
- if ((r = name_link(ret)) < 0) {
- name_free(ret);
- return r;
+ return true;
+}
+
+void manager_write_utmp_reboot(Manager *m) {
+ int r;
+
+ assert(m);
+
+ if (m->utmp_reboot_written)
+ return;
+
+ if (m->running_as != MANAGER_INIT)
+ return;
+
+ if (!manager_utmp_good(m))
+ return;
+
+ if ((r = utmp_put_reboot(m->boot_timestamp)) < 0) {
+
+ if (r != -ENOENT && r != -EROFS)
+ log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
+
+ return;
}
- /* At this point the new entry is created and linked. However,
- * not loaded. Now load this entry and all its dependencies
- * recursively */
+ m->utmp_reboot_written = true;
+}
- dispatch_load_queue(m);
+void manager_write_utmp_runlevel(Manager *m, Unit *u) {
+ int runlevel, r;
-finish:
+ assert(m);
+ assert(u);
- *_ret = ret;
- return 0;
+ if (u->meta.type != UNIT_TARGET)
+ return;
+
+ if (m->running_as != MANAGER_INIT)
+ return;
+
+ if (!manager_utmp_good(m))
+ return;
+
+ if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
+ return;
+
+ if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
+
+ if (r != -ENOENT && r != -EROFS)
+ log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
+ }
}
-void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
- void *state;
- Job *j;
+void manager_dispatch_bus_name_owner_changed(
+ Manager *m,
+ const char *name,
+ const char* old_owner,
+ const char *new_owner) {
- assert(s);
- assert(f);
+ Unit *u;
- HASHMAP_FOREACH(j, s->jobs, state)
- job_dump(j, f, prefix);
+ assert(m);
+ assert(name);
+
+ if (!(u = hashmap_get(m->watch_bus, name)))
+ return;
+
+ UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
}
-void manager_dump_names(Manager *s, FILE *f, const char *prefix) {
- void *state;
- Name *n;
- const char *t;
+void manager_dispatch_bus_query_pid_done(
+ Manager *m,
+ const char *name,
+ pid_t pid) {
- assert(s);
- assert(f);
+ Unit *u;
- HASHMAP_FOREACH_KEY(n, t, s->names, state)
- if (name_id(n) == t)
- name_dump(n, f, prefix);
+ assert(m);
+ assert(name);
+ assert(pid >= 1);
+
+ if (!(u = hashmap_get(m->watch_bus, name)))
+ return;
+
+ UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
}
+
+static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
+ [MANAGER_INIT] = "init",
+ [MANAGER_SYSTEM] = "system",
+ [MANAGER_SESSION] = "session"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);