| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| 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 <sys/timerfd.h> |
| #include <sys/epoll.h> |
| |
| #include "set.h" |
| #include "unit.h" |
| #include "macro.h" |
| #include "strv.h" |
| #include "load-fragment.h" |
| #include "load-dropin.h" |
| #include "log.h" |
| #include "dbus-job.h" |
| |
| Job* job_new(Manager *m, JobType type, Unit *unit) { |
| Job *j; |
| |
| assert(m); |
| assert(type < _JOB_TYPE_MAX); |
| assert(unit); |
| |
| if (!(j = new0(Job, 1))) |
| return NULL; |
| |
| j->manager = m; |
| j->id = m->current_job_id++; |
| j->type = type; |
| j->unit = unit; |
| |
| j->timer_watch.type = WATCH_INVALID; |
| |
| /* We don't link it here, that's what job_dependency() is for */ |
| |
| return j; |
| } |
| |
| void job_free(Job *j) { |
| assert(j); |
| |
| /* Detach from next 'bigger' objects */ |
| if (j->installed) { |
| bus_job_send_removed_signal(j); |
| |
| if (j->unit->meta.job == j) { |
| j->unit->meta.job = NULL; |
| unit_add_to_gc_queue(j->unit); |
| } |
| |
| hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id)); |
| j->installed = false; |
| } |
| |
| /* Detach from next 'smaller' objects */ |
| manager_transaction_unlink_job(j->manager, j, true); |
| |
| if (j->in_run_queue) |
| LIST_REMOVE(Job, run_queue, j->manager->run_queue, j); |
| |
| if (j->in_dbus_queue) |
| LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j); |
| |
| if (j->timer_watch.type != WATCH_INVALID) { |
| assert(j->timer_watch.type == WATCH_JOB_TIMER); |
| assert(j->timer_watch.data.job == j); |
| assert(j->timer_watch.fd >= 0); |
| |
| assert_se(epoll_ctl(j->manager->epoll_fd, EPOLL_CTL_DEL, j->timer_watch.fd, NULL) >= 0); |
| close_nointr_nofail(j->timer_watch.fd); |
| } |
| |
| free(j->bus_client); |
| free(j); |
| } |
| |
| JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts) { |
| JobDependency *l; |
| |
| assert(object); |
| |
| /* Adds a new job link, which encodes that the 'subject' job |
| * needs the 'object' job in some way. If 'subject' is NULL |
| * this means the 'anchor' job (i.e. the one the user |
| * explicitly asked for) is the requester. */ |
| |
| if (!(l = new0(JobDependency, 1))) |
| return NULL; |
| |
| l->subject = subject; |
| l->object = object; |
| l->matters = matters; |
| l->conflicts = conflicts; |
| |
| if (subject) |
| LIST_PREPEND(JobDependency, subject, subject->subject_list, l); |
| else |
| LIST_PREPEND(JobDependency, subject, object->manager->transaction_anchor, l); |
| |
| LIST_PREPEND(JobDependency, object, object->object_list, l); |
| |
| return l; |
| } |
| |
| void job_dependency_free(JobDependency *l) { |
| assert(l); |
| |
| if (l->subject) |
| LIST_REMOVE(JobDependency, subject, l->subject->subject_list, l); |
| else |
| LIST_REMOVE(JobDependency, subject, l->object->manager->transaction_anchor, l); |
| |
| LIST_REMOVE(JobDependency, object, l->object->object_list, l); |
| |
| free(l); |
| } |
| |
| void job_dump(Job *j, FILE*f, const char *prefix) { |
| assert(j); |
| assert(f); |
| |
| if (!prefix) |
| prefix = ""; |
| |
| fprintf(f, |
| "%s-> Job %u:\n" |
| "%s\tAction: %s -> %s\n" |
| "%s\tState: %s\n" |
| "%s\tForced: %s\n", |
| prefix, j->id, |
| prefix, j->unit->meta.id, job_type_to_string(j->type), |
| prefix, job_state_to_string(j->state), |
| prefix, yes_no(j->override)); |
| } |
| |
| bool job_is_anchor(Job *j) { |
| JobDependency *l; |
| |
| assert(j); |
| |
| LIST_FOREACH(object, l, j->object_list) |
| if (!l->subject) |
| return true; |
| |
| return false; |
| } |
| |
| static bool types_match(JobType a, JobType b, JobType c, JobType d) { |
| return |
| (a == c && b == d) || |
| (a == d && b == c); |
| } |
| |
| int job_type_merge(JobType *a, JobType b) { |
| if (*a == b) |
| return 0; |
| |
| /* Merging is associative! a merged with b merged with c is |
| * the same as a merged with c merged with b. */ |
| |
| /* Mergeability is transitive! if a can be merged with b and b |
| * with c then a also with c */ |
| |
| /* Also, if a merged with b cannot be merged with c, then |
| * either a or b cannot be merged with c either */ |
| |
| if (types_match(*a, b, JOB_START, JOB_VERIFY_ACTIVE)) |
| *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_ACTIVE, 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_ACTIVE, 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_ACTIVE, JOB_RELOAD)) |
| *a = JOB_RELOAD; |
| else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_TRY_RESTART) || |
| types_match(*a, b, JOB_RELOAD, JOB_TRY_RESTART)) |
| *a = JOB_TRY_RESTART; |
| else |
| return -EEXIST; |
| |
| return 0; |
| } |
| |
| bool job_type_is_mergeable(JobType a, JobType b) { |
| return job_type_merge(&a, b) >= 0; |
| } |
| |
| bool job_type_is_superset(JobType a, JobType b) { |
| |
| /* Checks whether operation a is a "superset" of b in its |
| * actions */ |
| |
| if (a == b) |
| return true; |
| |
| switch (a) { |
| case JOB_START: |
| return b == JOB_VERIFY_ACTIVE; |
| |
| case JOB_RELOAD: |
| return |
| b == JOB_VERIFY_ACTIVE; |
| |
| case JOB_RELOAD_OR_START: |
| return |
| b == JOB_RELOAD || |
| b == JOB_START || |
| b == JOB_VERIFY_ACTIVE; |
| |
| case JOB_RESTART: |
| return |
| b == JOB_START || |
| b == JOB_VERIFY_ACTIVE || |
| b == JOB_RELOAD || |
| b == JOB_RELOAD_OR_START || |
| b == JOB_TRY_RESTART; |
| |
| case JOB_TRY_RESTART: |
| return |
| b == JOB_VERIFY_ACTIVE || |
| b == JOB_RELOAD; |
| default: |
| return false; |
| |
| } |
| } |
| |
| bool job_type_is_conflicting(JobType a, JobType b) { |
| assert(a >= 0 && a < _JOB_TYPE_MAX); |
| assert(b >= 0 && b < _JOB_TYPE_MAX); |
| |
| return (a == JOB_STOP) != (b == JOB_STOP); |
| } |
| |
| bool job_type_is_redundant(JobType a, UnitActiveState b) { |
| switch (a) { |
| |
| case JOB_START: |
| return |
| b == UNIT_ACTIVE || |
| b == UNIT_RELOADING; |
| |
| case JOB_STOP: |
| return |
| b == UNIT_INACTIVE || |
| b == UNIT_FAILED; |
| |
| case JOB_VERIFY_ACTIVE: |
| return |
| b == UNIT_ACTIVE || |
| b == UNIT_RELOADING; |
| |
| case JOB_RELOAD: |
| return |
| b == UNIT_RELOADING; |
| |
| case JOB_RELOAD_OR_START: |
| return |
| b == UNIT_ACTIVATING || |
| b == UNIT_RELOADING; |
| |
| case JOB_RESTART: |
| return |
| b == UNIT_ACTIVATING; |
| |
| case JOB_TRY_RESTART: |
| return |
| b == UNIT_ACTIVATING; |
| |
| default: |
| assert_not_reached("Invalid job type"); |
| } |
| } |
| |
| bool job_is_runnable(Job *j) { |
| Iterator i; |
| Unit *other; |
| |
| assert(j); |
| assert(j->installed); |
| |
| /* Checks whether there is any job running for the units this |
| * job needs to be running after (in the case of a 'positive' |
| * job type) or before (in the case of a 'negative' job |
| * type. */ |
| |
| /* First check if there is an override */ |
| if (j->ignore_deps) |
| return true; |
| |
| if (j->type == JOB_START || |
| j->type == JOB_VERIFY_ACTIVE || |
| j->type == JOB_RELOAD || |
| j->type == JOB_RELOAD_OR_START) { |
| |
| /* Immediate result is that the job is or might be |
| * started. In this case lets wait for the |
| * dependencies, regardless whether they are |
| * starting or stopping something. */ |
| |
| SET_FOREACH(other, j->unit->meta.dependencies[UNIT_AFTER], i) |
| if (other->meta.job) |
| return false; |
| } |
| |
| /* Also, if something else is being stopped and we should |
| * change state after it, then lets wait. */ |
| |
| SET_FOREACH(other, j->unit->meta.dependencies[UNIT_BEFORE], i) |
| if (other->meta.job && |
| (other->meta.job->type == JOB_STOP || |
| other->meta.job->type == JOB_RESTART || |
| other->meta.job->type == JOB_TRY_RESTART)) |
| return false; |
| |
| /* This means that for a service a and a service b where b |
| * shall be started after a: |
| * |
| * start a + start b → 1st step start a, 2nd step start b |
| * start a + stop b → 1st step stop b, 2nd step start a |
| * stop a + start b → 1st step stop a, 2nd step start b |
| * stop a + stop b → 1st step stop b, 2nd step stop a |
| * |
| * This has the side effect that restarts are properly |
| * synchronized too. */ |
| |
| return true; |
| } |
| |
| int job_run_and_invalidate(Job *j) { |
| int r; |
| uint32_t id; |
| Manager *m; |
| |
| assert(j); |
| assert(j->installed); |
| |
| if (j->in_run_queue) { |
| LIST_REMOVE(Job, run_queue, j->manager->run_queue, j); |
| j->in_run_queue = false; |
| } |
| |
| if (j->state != JOB_WAITING) |
| return 0; |
| |
| if (!job_is_runnable(j)) |
| return -EAGAIN; |
| |
| j->state = JOB_RUNNING; |
| job_add_to_dbus_queue(j); |
| |
| /* While we execute this operation the job might go away (for |
| * example: because it is replaced by a new, conflicting |
| * job.) To make sure we don't access a freed job later on we |
| * store the id here, so that we can verify the job is still |
| * valid. */ |
| id = j->id; |
| m = j->manager; |
| |
| switch (j->type) { |
| |
| case JOB_START: |
| r = unit_start(j->unit); |
| |
| /* If this unit cannot be started, then simply |
| * wait */ |
| if (r == -EBADR) |
| r = 0; |
| |
| break; |
| |
| case JOB_VERIFY_ACTIVE: { |
| UnitActiveState t = unit_active_state(j->unit); |
| if (UNIT_IS_ACTIVE_OR_RELOADING(t)) |
| r = -EALREADY; |
| else if (t == UNIT_ACTIVATING) |
| r = -EAGAIN; |
| else |
| r = -ENOEXEC; |
| break; |
| } |
| |
| case JOB_STOP: |
| r = unit_stop(j->unit); |
| |
| /* If this unit cannot stopped, then simply |
| * wait. */ |
| if (r == -EBADR) |
| r = 0; |
| break; |
| |
| case JOB_RELOAD: |
| r = unit_reload(j->unit); |
| break; |
| |
| case JOB_RELOAD_OR_START: |
| if (unit_active_state(j->unit) == UNIT_ACTIVE) { |
| j->type = JOB_RELOAD; |
| r = unit_reload(j->unit); |
| } else { |
| j->type = JOB_START; |
| r = unit_start(j->unit); |
| |
| if (r == -EBADR) |
| r = 0; |
| } |
| break; |
| |
| case JOB_RESTART: { |
| UnitActiveState t = unit_active_state(j->unit); |
| if (t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_ACTIVATING) { |
| j->type = JOB_START; |
| r = unit_start(j->unit); |
| } else |
| r = unit_stop(j->unit); |
| break; |
| } |
| |
| case JOB_TRY_RESTART: { |
| UnitActiveState t = unit_active_state(j->unit); |
| if (t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_DEACTIVATING) |
| r = -ENOEXEC; |
| else if (t == UNIT_ACTIVATING) { |
| j->type = JOB_START; |
| r = unit_start(j->unit); |
| } else { |
| j->type = JOB_RESTART; |
| r = unit_stop(j->unit); |
| } |
| break; |
| } |
| |
| default: |
| assert_not_reached("Unknown job type"); |
| } |
| |
| if ((j = manager_get_job(m, id))) { |
| if (r == -EALREADY) |
| r = job_finish_and_invalidate(j, JOB_DONE); |
| else if (r == -ENOEXEC) |
| r = job_finish_and_invalidate(j, JOB_SKIPPED); |
| else if (r == -EAGAIN) |
| j->state = JOB_WAITING; |
| else if (r < 0) |
| r = job_finish_and_invalidate(j, JOB_FAILED); |
| } |
| |
| return r; |
| } |
| |
| int job_finish_and_invalidate(Job *j, JobResult result) { |
| Unit *u; |
| Unit *other; |
| JobType t; |
| Iterator i; |
| |
| assert(j); |
| assert(j->installed); |
| |
| job_add_to_dbus_queue(j); |
| |
| /* Patch restart jobs so that they become normal start jobs */ |
| if (result == JOB_DONE && (j->type == JOB_RESTART || j->type == JOB_TRY_RESTART)) { |
| |
| log_debug("Converting job %s/%s -> %s/%s", |
| j->unit->meta.id, job_type_to_string(j->type), |
| j->unit->meta.id, job_type_to_string(JOB_START)); |
| |
| j->state = JOB_WAITING; |
| j->type = JOB_START; |
| |
| job_add_to_run_queue(j); |
| return 0; |
| } |
| |
| j->result = result; |
| |
| log_debug("Job %s/%s finished, result=%s", j->unit->meta.id, job_type_to_string(j->type), job_result_to_string(result)); |
| |
| if (result == JOB_FAILED) |
| j->manager->n_failed_jobs ++; |
| |
| u = j->unit; |
| t = j->type; |
| job_free(j); |
| |
| if (result == JOB_FAILED && t == JOB_START) |
| unit_status_printf(u, "Starting %s " ANSI_HIGHLIGHT_ON "failed" ANSI_HIGHLIGHT_OFF ", see 'systemctl status %s' for details.\n", unit_description(u), u->meta.id); |
| else if (result == JOB_TIMEOUT && t == JOB_START) |
| unit_status_printf(u, "Starting %s " ANSI_HIGHLIGHT_ON "timed out" ANSI_HIGHLIGHT_OFF ".\n", unit_description(u), u->meta.id); |
| else if (result == JOB_TIMEOUT && t == JOB_STOP) |
| unit_status_printf(u, "Stopping %s " ANSI_HIGHLIGHT_ON "timed out" ANSI_HIGHLIGHT_OFF ".\n", unit_description(u), u->meta.id); |
| |
| /* Fail depending jobs on failure */ |
| if (result != JOB_DONE) { |
| |
| if (t == JOB_START || |
| t == JOB_VERIFY_ACTIVE || |
| t == JOB_RELOAD_OR_START) { |
| |
| SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i) |
| if (other->meta.job && |
| (other->meta.job->type == JOB_START || |
| other->meta.job->type == JOB_VERIFY_ACTIVE || |
| other->meta.job->type == JOB_RELOAD_OR_START)) |
| job_finish_and_invalidate(other->meta.job, JOB_DEPENDENCY); |
| |
| SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i) |
| if (other->meta.job && |
| (other->meta.job->type == JOB_START || |
| other->meta.job->type == JOB_VERIFY_ACTIVE || |
| other->meta.job->type == JOB_RELOAD_OR_START)) |
| job_finish_and_invalidate(other->meta.job, JOB_DEPENDENCY); |
| |
| SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i) |
| if (other->meta.job && |
| !other->meta.job->override && |
| (other->meta.job->type == JOB_START || |
| other->meta.job->type == JOB_VERIFY_ACTIVE || |
| other->meta.job->type == JOB_RELOAD_OR_START)) |
| job_finish_and_invalidate(other->meta.job, JOB_DEPENDENCY); |
| |
| } else if (t == JOB_STOP) { |
| |
| SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i) |
| if (other->meta.job && |
| (other->meta.job->type == JOB_START || |
| other->meta.job->type == JOB_VERIFY_ACTIVE || |
| other->meta.job->type == JOB_RELOAD_OR_START)) |
| job_finish_and_invalidate(other->meta.job, JOB_DEPENDENCY); |
| } |
| } |
| |
| /* Trigger OnFailure dependencies that are not generated by |
| * the unit itself. We don't tread JOB_CANCELED as failure in |
| * this context. And JOB_FAILURE is already handled by the |
| * unit itself. */ |
| if (result == JOB_TIMEOUT || result == JOB_DEPENDENCY) |
| unit_trigger_on_failure(u); |
| |
| /* Try to start the next jobs that can be started */ |
| SET_FOREACH(other, u->meta.dependencies[UNIT_AFTER], i) |
| if (other->meta.job) |
| job_add_to_run_queue(other->meta.job); |
| SET_FOREACH(other, u->meta.dependencies[UNIT_BEFORE], i) |
| if (other->meta.job) |
| job_add_to_run_queue(other->meta.job); |
| |
| manager_check_finished(u->meta.manager); |
| |
| return 0; |
| } |
| |
| int job_start_timer(Job *j) { |
| struct itimerspec its; |
| struct epoll_event ev; |
| int fd, r; |
| assert(j); |
| |
| if (j->unit->meta.job_timeout <= 0 || |
| j->timer_watch.type == WATCH_JOB_TIMER) |
| return 0; |
| |
| assert(j->timer_watch.type == WATCH_INVALID); |
| |
| if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) { |
| r = -errno; |
| goto fail; |
| } |
| |
| zero(its); |
| timespec_store(&its.it_value, j->unit->meta.job_timeout); |
| |
| if (timerfd_settime(fd, 0, &its, NULL) < 0) { |
| r = -errno; |
| goto fail; |
| } |
| |
| zero(ev); |
| ev.data.ptr = &j->timer_watch; |
| ev.events = EPOLLIN; |
| |
| if (epoll_ctl(j->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { |
| r = -errno; |
| goto fail; |
| } |
| |
| j->timer_watch.type = WATCH_JOB_TIMER; |
| j->timer_watch.fd = fd; |
| j->timer_watch.data.job = j; |
| |
| return 0; |
| |
| fail: |
| if (fd >= 0) |
| close_nointr_nofail(fd); |
| |
| return r; |
| } |
| |
| void job_add_to_run_queue(Job *j) { |
| assert(j); |
| assert(j->installed); |
| |
| if (j->in_run_queue) |
| return; |
| |
| LIST_PREPEND(Job, run_queue, j->manager->run_queue, j); |
| j->in_run_queue = true; |
| } |
| |
| void job_add_to_dbus_queue(Job *j) { |
| assert(j); |
| assert(j->installed); |
| |
| if (j->in_dbus_queue) |
| return; |
| |
| /* We don't check if anybody is subscribed here, since this |
| * job might just have been created and not yet assigned to a |
| * connection/client. */ |
| |
| LIST_PREPEND(Job, dbus_queue, j->manager->dbus_job_queue, j); |
| j->in_dbus_queue = true; |
| } |
| |
| char *job_dbus_path(Job *j) { |
| char *p; |
| |
| assert(j); |
| |
| if (asprintf(&p, "/org/freedesktop/systemd1/job/%lu", (unsigned long) j->id) < 0) |
| return NULL; |
| |
| return p; |
| } |
| |
| void job_timer_event(Job *j, uint64_t n_elapsed, Watch *w) { |
| assert(j); |
| assert(w == &j->timer_watch); |
| |
| log_warning("Job %s/%s timed out.", j->unit->meta.id, job_type_to_string(j->type)); |
| job_finish_and_invalidate(j, JOB_TIMEOUT); |
| } |
| |
| static const char* const job_state_table[_JOB_STATE_MAX] = { |
| [JOB_WAITING] = "waiting", |
| [JOB_RUNNING] = "running" |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(job_state, JobState); |
| |
| static const char* const job_type_table[_JOB_TYPE_MAX] = { |
| [JOB_START] = "start", |
| [JOB_VERIFY_ACTIVE] = "verify-active", |
| [JOB_STOP] = "stop", |
| [JOB_RELOAD] = "reload", |
| [JOB_RELOAD_OR_START] = "reload-or-start", |
| [JOB_RESTART] = "restart", |
| [JOB_TRY_RESTART] = "try-restart", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(job_type, JobType); |
| |
| static const char* const job_mode_table[_JOB_MODE_MAX] = { |
| [JOB_FAIL] = "fail", |
| [JOB_REPLACE] = "replace", |
| [JOB_ISOLATE] = "isolate", |
| [JOB_IGNORE_DEPENDENCIES] = "ignore-dependencies" |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(job_mode, JobMode); |
| |
| static const char* const job_result_table[_JOB_RESULT_MAX] = { |
| [JOB_DONE] = "done", |
| [JOB_CANCELED] = "canceled", |
| [JOB_TIMEOUT] = "timeout", |
| [JOB_FAILED] = "failed", |
| [JOB_DEPENDENCY] = "dependency", |
| [JOB_SKIPPED] = "skipped" |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(job_result, JobResult); |