/*-*- 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 <http://www.gnu.org/licenses/>.
+***/
+
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/poll.h>
+#include <sys/reboot.h>
+#include <sys/ioctl.h>
+#include <linux/kd.h>
+#include <libcgroup.h>
#include "manager.h"
#include "hashmap.h"
#include "macro.h"
#include "strv.h"
#include "log.h"
+#include "util.h"
+#include "ratelimit.h"
+#include "cgroup.h"
+#include "mount-setup.h"
-Manager* manager_new(void) {
- Manager *m;
+static int manager_setup_signals(Manager *m) {
sigset_t mask;
struct epoll_event ev;
+ assert(m);
+
+ assert_se(reset_all_signal_handlers() == 0);
+
+ assert_se(sigemptyset(&mask) == 0);
+ assert_se(sigaddset(&mask, SIGCHLD) == 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, SIGTERM) == 0);
+ assert_se(sigaddset(&mask, SIGHUP) == 0);
+ assert_se(sigaddset(&mask, SIGUSR1) == 0);
+ assert_se(sigaddset(&mask, SIGUSR2) == 0);
+ assert_se(sigaddset(&mask, SIGPIPE) == 0);
+ assert_se(sigaddset(&mask, SIGPWR) == 0);
+ assert_se(sigaddset(&mask, SIGTTIN) == 0);
+ 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) {
+ /* Enable that we get SIGINT on control-alt-del */
+ if (reboot(RB_DISABLE_CAD) < 0)
+ log_warning("Failed to enable ctrl-alt-del handling: %s", strerror(errno));
+
+ /* Enable that we get SIGWINCH on kbrequest */
+ if (ioctl(0, KDSIGACCEPT, SIGWINCH) < 0)
+ log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
+ }
+
+ 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;
+ }
+ }
+
+ strv_uniq(m->unit_path);
+ strv_uniq(m->sysvinit_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.");
+
+ return 0;
+}
+
+int manager_new(Manager **_m) {
+ Manager *m;
+ int r = -ENOMEM;
+
+ assert(_m);
+
if (!(m = new0(Manager, 1)))
- return NULL;
+ return -ENOMEM;
- m->signal_fd = m->epoll_fd = -1;
+ m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = -1;
+ m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
- if (!(m->names = hashmap_new(string_hash_func, string_compare_func)))
+ if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
goto fail;
if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
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->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
goto fail;
- assert_se(sigemptyset(&mask) == 0);
- assert_se(sigaddset(&mask, SIGCHLD) == 0);
- assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
+ if (getpid() == 1)
+ m->running_as = MANAGER_INIT;
+ else if (getuid() == 0)
+ m->running_as = MANAGER_SYSTEM;
+ else
+ m->running_as = MANAGER_SESSION;
+
+ log_debug("systemd running in %s mode.", manager_running_as_to_string(m->running_as));
- if ((m->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
+ if ((r = manager_find_paths(m)) < 0)
goto fail;
- zero(ev);
- ev.events = EPOLLIN;
- ev.data.fd = m->signal_fd;
+ if (chdir("/") < 0)
+ log_warning("Failed to chdir to /: %s", strerror(errno));
+
+ /* Become a session leader if we aren't one yet. */
+ setsid();
- if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_fd, &ev) < 0)
+ if ((r = manager_setup_signals(m)) < 0)
goto fail;
- return m;
+ if ((r = mount_setup()) < 0)
+ goto fail;
+
+ if ((r = manager_setup_cgroup(m)) < 0)
+ goto fail;
+
+ dbus_connection_set_change_sigpipe(FALSE);
+
+ /* 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);
if (m->epoll_fd >= 0)
close_nointr(m->epoll_fd);
- if (m->signal_fd >= 0)
- close_nointr(m->signal_fd);
+ if (m->signal_watch.fd >= 0)
+ close_nointr(m->signal_watch.fd);
+
+ strv_free(m->unit_path);
+ strv_free(m->sysvinit_path);
+
+ free(m->cgroup_controller);
+ free(m->cgroup_hierarchy);
+
+ assert(hashmap_isempty(m->cgroup_bondings));
+ hashmap_free(m->cgroup_bondings);
free(m);
}
-static void transaction_delete_job(Manager *m, Job *j) {
+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 (unit_id(u) != k)
+ continue;
+
+ if (UNIT_VTABLE(u)->coldplug)
+ if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
+ return r;
+ }
+
+ 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);
+ manager_transaction_unlink_job(m, j, delete_dependencies);
if (!j->installed)
job_free(j);
}
-static void transaction_delete_name(Manager *m, Name *n) {
+static void transaction_delete_unit(Manager *m, Unit *u) {
Job *j;
- /* Deletes all jobs associated with a certain name from the
+ /* Deletes all jobs associated with a certain unit from the
* transaction */
- while ((j = hashmap_get(m->transaction_jobs, n)))
- transaction_delete_job(m, j);
+ 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) {
while ((j = hashmap_first(m->transaction_jobs)))
if (j->installed)
- transaction_delete_job(m, j);
+ 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) {
assert(m);
- /* A recursive sweep through the graph that marks all names
+ /* 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 (!l->matters)
continue;
- /* This name has already been marked */
+ /* This unit has already been marked */
if (l->object->generation == generation)
continue;
assert(j);
assert(other);
- assert(j->name == other->name);
+ assert(j->unit == other->unit);
assert(!j->installed);
/* Merges 'other' into 'j' and then deletes j. */
/* Kill the other job */
other->subject_list = NULL;
other->object_list = NULL;
- transaction_delete_job(m, other);
+ transaction_delete_job(m, other, true);
}
static int delete_one_unmergeable_job(Manager *m, Job *j) {
return -ENOEXEC;
/* Ok, we can drop one, so let's do so. */
- log_debug("Try to fix job merging by deleting job %s/%s", name_id(d->name), job_type_to_string(d->type));
- transaction_delete_job(m, d);
+ log_debug("Trying to fix job merging by deleting job %s/%s", unit_id(d->unit), job_type_to_string(d->type));
+ transaction_delete_job(m, d, true);
return 0;
}
assert_se(job_type_merge(&t, k->type) == 0);
/* If an active job is mergeable, merge it too */
- if (j->name->meta.job)
- job_type_merge(&t, j->name->meta.job->type); /* Might fail. Which is OK */
+ 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->installed) {
return 0;
}
-static bool name_matters_to_anchor(Name *n, Job *j) {
- assert(n);
+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.", unit_id(j->unit), 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 name
+ /* Checks whether at least one of the jobs for this unit
* matters to the anchor. */
LIST_FOREACH(transaction, j, j)
static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) {
Iterator i;
- Name *n;
+ Unit *u;
int r;
assert(m);
* since smart how we are we stored our way back in
* there. */
+ log_debug("Found ordering cycle on %s/%s", unit_id(j->unit), job_type_to_string(j->type));
+
for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) {
+ log_debug("Walked on cycle path to %s/%s", unit_id(k->unit), job_type_to_string(k->type));
+
if (!k->installed &&
- !name_matters_to_anchor(k->name, k)) {
+ !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", name_id(k->name), job_type_to_string(k->type));
- transaction_delete_name(m, k->name);
+ log_debug("Breaking order cycle by deleting job %s/%s", unit_id(k->unit), job_type_to_string(k->type));
+ transaction_delete_unit(m, k->unit);
return -EAGAIN;
}
break;
}
+ log_debug("Unable to break cycle");
+
return -ENOEXEC;
}
j->generation = generation;
/* We assume that the the dependencies are bidirectional, and
- * hence can ignore NAME_AFTER */
- SET_FOREACH(n, j->name->meta.dependencies[NAME_BEFORE], i) {
+ * hence can ignore UNIT_AFTER */
+ SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
Job *o;
- /* Is there a job for this name? */
- if (!(o = hashmap_get(m->transaction_jobs, n)))
+ /* 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 = n->meta.job))
+ 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;
}
if (j->object_list)
continue;
- log_debug("Garbage collecting job %s/%s", name_id(j->name), job_type_to_string(j->type));
- transaction_delete_job(m, j);
+ log_debug("Garbage collecting job %s/%s", unit_id(j->unit), job_type_to_string(j->type));
+ transaction_delete_job(m, j, true);
again = true;
break;
}
assert(!j->transaction_prev);
assert(!j->transaction_next);
- if (j->name->meta.job &&
- j->name->meta.job != j &&
- !job_type_is_superset(j->type, j->name->meta.job->type))
+ if (j->unit->meta.job &&
+ j->unit->meta.job != j &&
+ !job_type_is_superset(j->type, j->unit->meta.job->type))
return -EEXIST;
}
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)
/* Would this stop a running service?
* Would this change an existing job?
* If so, let's drop this entry */
- if ((j->type != JOB_STOP || NAME_IS_INACTIVE_OR_DEACTIVATING(name_active_state(j->name))) &&
- (!j->name->meta.job || job_type_is_conflicting(j->type, j->name->meta.job->state)))
+
+ 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.", unit_id(j->unit), job_type_to_string(j->type));
+
+ if (changes_existing_job)
+ log_debug("%s/%s would change existing job.", unit_id(j->unit), job_type_to_string(j->type));
+
/* Ok, let's get rid of this */
- log_debug("Deleting %s/%s to minimize impact", name_id(j->name), job_type_to_string(j->type));
- transaction_delete_job(m, j);
+ log_debug("Deleting %s/%s to minimize impact.", unit_id(j->unit), job_type_to_string(j->type));
+
+ transaction_delete_job(m, j, true);
again = true;
break;
}
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->unit->meta.job = j;
j->installed = true;
/* We're fully installed. Now let's free data we don't
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);
}
- m->transaction_anchor = NULL;
+ /* As last step, kill all remaining job dependencies. */
+ transaction_clean_dependencies(m);
return 0;
* jobs if we don't have to. */
transaction_minimize_impact(m);
+ /* Third step: Drop redundant jobs */
+ transaction_drop_redundant(m);
+
for (;;) {
- /* Third step: Let's remove unneeded jobs that might
+ /* Fourth step: Let's remove unneeded jobs that might
* be lurking. */
transaction_collect_garbage(m);
- /* Fourth step: verify order makes sense and correct
+ /* Fifth step: verify order makes sense and correct
* cycles if necessary and possible */
if ((r = transaction_verify_order(m, &generation)) >= 0)
break;
- if (r != -EAGAIN)
+ if (r != -EAGAIN) {
+ log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
goto rollback;
+ }
/* Let's see if the resulting transaction ordering
* graph is still cyclic... */
}
for (;;) {
- /* Fifth step: let's drop unmergeable entries if
+ /* 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)
+ if (r != -EAGAIN) {
+ log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r));
goto rollback;
+ }
- /* Sixth step: an entry got dropped, let's garbage
+ /* Seventh step: an entry got dropped, let's garbage
* collect its dependencies. */
transaction_collect_garbage(m);
* unmergeable entries ... */
}
- /* Seventh step: check whether we can actually apply this */
+ /* 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;
+ }
- /* Eights 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);
return r;
}
-static Job* transaction_add_one_job(Manager *m, JobType type, Name *name, bool force, bool *is_new) {
+static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool force, 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);
LIST_FOREACH(transaction, j, f) {
- assert(j->name == name);
+ assert(j->unit == unit);
if (j->type == type) {
if (is_new)
}
}
- if (name->meta.job && name->meta.job->type == type)
- j = name->meta.job;
- else if (!(j = job_new(m, type, name)))
+ if (unit->meta.job && unit->meta.job->type == type)
+ j = unit->meta.job;
+ else if (!(j = job_new(m, type, unit)))
return NULL;
j->generation = 0;
LIST_PREPEND(Job, transaction, f, j);
- if ((r = hashmap_replace(m->transaction_jobs, name, f)) < 0) {
+ 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_id(unit), job_type_to_string(type));
+
return j;
}
-void manager_transaction_unlink_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;
job_dependency_free(j->object_list);
- if (other) {
+ if (other && delete_dependencies) {
log_debug("Deleting job %s/%s as dependency of job %s/%s",
- name_id(other->name), job_type_to_string(other->type),
- name_id(j->name), job_type_to_string(j->type));
- transaction_delete_job(m, other);
+ unit_id(other->unit), job_type_to_string(other->type),
+ unit_id(j->unit), 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 force, Job **_ret) {
Job *ret;
Iterator i;
- Name *dep;
+ Unit *dep;
int r;
bool is_new;
assert(m);
assert(type < _JOB_TYPE_MAX);
- assert(name);
+ assert(unit);
- if (name->meta.load_state != NAME_LOADED)
+ if (unit->meta.load_state != UNIT_LOADED)
return -EINVAL;
- if (!name_job_is_applicable(name, type))
+ if (!unit_job_is_applicable(unit, type))
return -EBADR;
/* First add the job. */
- if (!(ret = transaction_add_one_job(m, type, name, force, &is_new)))
+ if (!(ret = transaction_add_one_job(m, type, unit, force, &is_new)))
return -ENOMEM;
/* Then, add a link to the job. */
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], i)
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, force, NULL)) < 0 && r != -EBADR)
goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUIRES], i)
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUIRES], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !force, force, NULL)) < 0 && r != -EBADR)
goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_WANTS], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, force, NULL)) < 0 && r != -EBADR)
- goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUISITE], i)
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, force, NULL)) < 0)
+ log_warning("Cannot add dependency job for unit %s, ignoring: %s", unit_id(dep), 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, force, NULL)) < 0 && r != -EBADR)
goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUISITE], i)
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUISITE], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !force, force, NULL)) < 0 && r != -EBADR)
goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_CONFLICTS], i)
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, force, 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], i)
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, force, 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 force, 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_id(unit), job_type_to_string(type));
+
+ if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, force, &ret)) < 0) {
transaction_abort(m);
return r;
}
if ((r = transaction_activate(m, mode)) < 0)
return r;
+ log_debug("Enqueued job %s/%s as %u", unit_id(unit), job_type_to_string(type), (unsigned) ret->id);
+
if (_ret)
*_ret = ret;
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 void dispatch_load_queue(Manager *m) {
+unsigned manager_dispatch_load_queue(Manager *m) {
Meta *meta;
+ unsigned n = 0;
assert(m);
/* Make sure we are not run recursively */
if (m->dispatching_load_queue)
- return;
+ return 0;
m->dispatching_load_queue = true;
- /* Dispatches the load queue. Takes a name from the queue and
+ /* Dispatches the load queue. Takes a unit from the queue and
* tries to load its data until the queue is empty */
while ((meta = m->load_queue)) {
assert(meta->in_load_queue);
- name_load(NAME(meta));
+ unit_load(UNIT(meta));
+ n++;
}
m->dispatching_load_queue = false;
+ return n;
}
-int manager_load_name(Manager *m, const char *name, Name **_ret) {
- Name *ret;
+int manager_load_unit(Manager *m, const char *path, Unit **_ret) {
+ Unit *ret;
int r;
+ const char *name;
assert(m);
- assert(name);
+ assert(path);
assert(_ret);
/* This will load the service information files, but not actually
- * start any services or anything */
+ * start any services or anything. */
- if ((ret = manager_get_name(m, name))) {
+ name = file_name_from_path(path);
+
+ if ((ret = manager_get_unit(m, name))) {
*_ret = ret;
return 0;
}
- if (!(ret = name_new(m)))
+ if (!(ret = unit_new(m)))
return -ENOMEM;
- if ((r = name_add_name(ret, name)) < 0) {
- name_free(ret);
+ if (is_path(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;
}
- name_add_to_load_queue(ret);
- dispatch_load_queue(m);
+ unit_add_to_load_queue(ret);
+ unit_add_to_dbus_queue(ret);
+
+ manager_dispatch_load_queue(m);
- *_ret = ret;
+ *_ret = unit_follow_merge(ret);
return 0;
}
job_dump(j, f, prefix);
}
-void manager_dump_names(Manager *s, FILE *f, const char *prefix) {
+void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
Iterator i;
- Name *n;
+ Unit *u;
const char *t;
assert(s);
assert(f);
- HASHMAP_FOREACH_KEY(n, t, s->names, i)
- if (name_id(n) == t)
- name_dump(n, f, prefix);
+ HASHMAP_FOREACH_KEY(u, t, s->units, i)
+ if (unit_id(u) == t)
+ unit_dump(u, f, prefix);
}
void manager_clear_jobs(Manager *m) {
job_free(j);
}
-void manager_dispatch_run_queue(Manager *m) {
+unsigned manager_dispatch_run_queue(Manager *m) {
Job *j;
+ unsigned n = 0;
if (m->dispatching_run_queue)
- return;
+ return 0;
m->dispatching_run_queue = true;
assert(j->in_run_queue);
job_run_and_invalidate(j);
+ n++;
}
m->dispatching_run_queue = false;
+ return 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;
+
+ 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);
+ log_debug("dispatching SIGCHLD");
+
for (;;) {
siginfo_t si;
- Name *n;
+ Unit *u;
zero(si);
- if (waitid(P_ALL, 0, &si, WNOHANG) < 0)
+ if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG) < 0) {
+
+ if (errno == ECHILD)
+ break;
+
return -errno;
+ }
if (si.si_pid == 0)
break;
if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
continue;
- if (!(n = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
+ log_debug("child %llu died (code=%s, status=%i)", (long long unsigned) si.si_pid, sigchld_code_to_string(si.si_code), si.si_status);
+
+ if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
continue;
- NAME_VTABLE(n)->sigchld_event(n, si.si_pid, si.si_code, si.si_status);
+ UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
}
return 0;
}
-static int manager_process_signal_fd(Manager *m) {
+static int manager_process_signal_fd(Manager *m, bool *quit) {
ssize_t n;
struct signalfd_siginfo sfsi;
bool sigchld = false;
assert(m);
for (;;) {
- if ((n = read(m->signal_fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
+ if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
if (n >= 0)
return -EIO;
if (errno == EAGAIN)
- return 0;
+ break;
return -errno;
}
- if (sfsi.ssi_signo == SIGCHLD)
+ switch (sfsi.ssi_signo) {
+
+ case SIGCHLD:
sigchld = true;
+ break;
+
+ case SIGINT:
+ case SIGTERM:
+
+ if (m->running_as != MANAGER_INIT) {
+ *quit = true;
+ return 0;
+
+ } else {
+ Unit *target;
+ int r;
+
+ if ((r = manager_load_unit(m, SPECIAL_CTRL_ALT_DEL_TARGET, &target)) < 0)
+ log_error("Failed to load ctrl-alt-del target: %s", strerror(-r));
+ else if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, true, NULL)) < 0)
+ log_error("Failed to enqueue ctrl-alt-del job: %s", strerror(-r));
+
+ break;
+ }
+
+ case SIGWINCH:
+
+ if (m->running_as == MANAGER_INIT) {
+ Unit *target;
+ int r;
+
+ if ((r = manager_load_unit(m, SPECIAL_KBREQUEST_TARGET, &target)) < 0)
+ log_error("Failed to load kbrequest target: %s", strerror(-r));
+ else if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, true, NULL)) < 0)
+ log_error("Failed to enqueue kbrequest job: %s", strerror(-r));
+
+ break;
+ }
+
+ /* This is a nop on non-init systemd's */
+
+ break;
+
+ default:
+ log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
+ }
}
if (sigchld)
return 0;
}
-static int process_event(Manager *m, struct epoll_event *ev) {
+static int process_event(Manager *m, struct epoll_event *ev, bool *quit) {
int r;
+ Watch *w;
assert(m);
assert(ev);
- switch (ev->data.u32) {
+ assert(w = ev->data.ptr);
- case MANAGER_SIGNAL:
- assert(ev->data.fd == m->signal_fd);
+ switch (w->type) {
- /* An incoming signal? */
- if (ev->events != POLLIN)
- return -EINVAL;
+ case WATCH_SIGNAL:
- if ((r = manager_process_signal_fd(m)) < 0)
- return -r;
+ /* An incoming signal? */
+ if (ev->events != EPOLLIN)
+ return -EINVAL;
- break;
+ if ((r = manager_process_signal_fd(m, quit)) < 0)
+ return r;
- case MANAGER_FD: {
- Name *n;
+ break;
- /* Some fd event, to be dispatched to the names */
- assert_se(n = ev->data.ptr);
- NAME_VTABLE(n)->fd_event(n, ev->data.fd, ev->events);
- break;
- }
+ case WATCH_FD:
- case MANAGER_TIMER: {
- Name *n;
- uint64_t u;
- ssize_t k;
+ /* 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;
- /* Some timer event, to be dispatched to the names */
- if ((k = read(ev->data.fd, &u, sizeof(u))) != sizeof(u)) {
+ case WATCH_TIMER: {
+ uint64_t v;
+ ssize_t k;
- if (k < 0 && (errno == EINTR || errno == EAGAIN))
- break;
+ /* Some timer event, to be dispatched to the units */
+ if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
- return k < 0 ? -errno : -EIO;
- }
+ if (k < 0 && (errno == EINTR || errno == EAGAIN))
+ break;
- assert_se(n = ev->data.ptr);
- NAME_VTABLE(n)->timer_event(n, ev->data.fd, u);
- break;
+ return k < 0 ? -errno : -EIO;
}
- default:
- assert_not_reached("Unknown epoll event type.");
+ UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
+ break;
+ }
+
+ 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_loop(Manager *m) {
int r;
+ bool quit = false;
+
+ RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
assert(m);
- for (;;) {
- struct epoll_event events[32];
- int n, i;
+ 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;
- manager_dispatch_run_queue(m);
+ if (manager_dispatch_dbus_queue(m) > 0)
+ continue;
- if ((n = epoll_wait(m->epoll_fd, events, ELEMENTSOF(events), -1)) < 0) {
+ if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
if (errno == -EINTR)
continue;
return -errno;
}
- for (i = 0; i < n; i++)
- if ((r = process_event(m, events + i)) < 0)
- return r;
- }
+ 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(s);
+ assert(_u);
+
+ if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
+ return -EINVAL;
+
+ if (!(n = bus_path_unescape(s+31)))
+ return -ENOMEM;
+
+ 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 (!startswith(s, "/org/freedesktop/systemd1/job/"))
+ return -EINVAL;
+
+ if ((r = safe_atou(s + 30, &id)) < 0)
+ return r;
+
+ if (!(j = manager_get_job(m, id)))
+ return -ENOENT;
+
+ *_j = j;
+
+ return 0;
+}
+
+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);
~ianmdlvl / elogind.git / blobdiff