+++ /dev/null
-/*-*- 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->job == j) {
- j->unit->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->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;
-}
-
-/*
- * Merging is commutative, so imagine the matrix as symmetric. We store only
- * its lower triangle to avoid duplication. We don't store the main diagonal,
- * because A merged with A is simply A.
- *
- * 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.
- */
-static const JobType job_merging_table[] = {
-/* What \ With * JOB_START JOB_VERIFY_ACTIVE JOB_STOP JOB_RELOAD JOB_RELOAD_OR_START JOB_RESTART JOB_TRY_RESTART */
-/************************************************************************************************************************************/
-/*JOB_START */
-/*JOB_VERIFY_ACTIVE */ JOB_START,
-/*JOB_STOP */ -1, -1,
-/*JOB_RELOAD */ JOB_RELOAD_OR_START, JOB_RELOAD, -1,
-/*JOB_RELOAD_OR_START*/ JOB_RELOAD_OR_START, JOB_RELOAD_OR_START, -1, JOB_RELOAD_OR_START,
-/*JOB_RESTART */ JOB_RESTART, JOB_RESTART, -1, JOB_RESTART, JOB_RESTART,
-/*JOB_TRY_RESTART */ JOB_RESTART, JOB_TRY_RESTART, -1, JOB_TRY_RESTART, JOB_RESTART, JOB_RESTART,
-};
-
-JobType job_type_lookup_merge(JobType a, JobType b) {
- assert_cc(ELEMENTSOF(job_merging_table) == _JOB_TYPE_MAX * (_JOB_TYPE_MAX - 1) / 2);
- assert(a >= 0 && a < _JOB_TYPE_MAX);
- assert(b >= 0 && b < _JOB_TYPE_MAX);
-
- if (a == b)
- return a;
-
- if (a < b) {
- JobType tmp = a;
- a = b;
- b = tmp;
- }
-
- return job_merging_table[(a - 1) * a / 2 + b];
-}
-
-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_order)
- 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->dependencies[UNIT_AFTER], i)
- if (other->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->dependencies[UNIT_BEFORE], i)
- if (other->job &&
- (other->job->type == JOB_STOP ||
- other->job->type == JOB_RESTART ||
- other->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;
-}
-
-static void job_change_type(Job *j, JobType newtype) {
- log_debug("Converting job %s/%s -> %s/%s",
- j->unit->id, job_type_to_string(j->type),
- j->unit->id, job_type_to_string(newtype));
-
- j->type = newtype;
-}
-
-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_RELOAD_OR_START:
- if (unit_active_state(j->unit) == UNIT_ACTIVE) {
- job_change_type(j, JOB_RELOAD);
- r = unit_reload(j->unit);
- break;
- }
- job_change_type(j, JOB_START);
- /* fall through */
-
- 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_TRY_RESTART:
- if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(j->unit))) {
- r = -ENOEXEC;
- break;
- }
- job_change_type(j, JOB_RESTART);
- /* fall through */
-
- case JOB_STOP:
- case JOB_RESTART:
- 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;
-
- 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;
-}
-
-static void job_print_status_message(Unit *u, JobType t, JobResult result) {
- assert(u);
-
- if (t == JOB_START) {
-
- switch (result) {
-
- case JOB_DONE:
- unit_status_printf(u, ANSI_HIGHLIGHT_GREEN_ON " OK " ANSI_HIGHLIGHT_OFF, "Started %s", unit_description(u));
- break;
-
- case JOB_FAILED:
- unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON "FAILED" ANSI_HIGHLIGHT_OFF, "Failed to start %s", unit_description(u));
- unit_status_printf(u, NULL, "See 'systemctl status %s' for details.", u->id);
- break;
-
- case JOB_DEPENDENCY:
- unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " ABORT" ANSI_HIGHLIGHT_OFF, "Dependency failed. Aborted start of %s", unit_description(u));
- break;
-
- case JOB_TIMEOUT:
- unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, "Timed out starting %s", unit_description(u));
- break;
-
- default:
- ;
- }
-
- } else if (t == JOB_STOP) {
-
- switch (result) {
-
- case JOB_TIMEOUT:
- unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, "Timed out stopping %s", unit_description(u));
- break;
-
- case JOB_DONE:
- case JOB_FAILED:
- unit_status_printf(u, ANSI_HIGHLIGHT_GREEN_ON " OK " ANSI_HIGHLIGHT_OFF, "Stopped %s", unit_description(u));
- break;
-
- default:
- ;
- }
- }
-}
-
-int job_finish_and_invalidate(Job *j, JobResult result) {
- Unit *u;
- Unit *other;
- JobType t;
- Iterator i;
- bool recursed = false;
-
- 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) {
-
- job_change_type(j, JOB_START);
- j->state = JOB_WAITING;
-
- job_add_to_run_queue(j);
-
- u = j->unit;
- goto finish;
- }
-
- j->result = result;
-
- log_debug("Job %s/%s finished, result=%s", j->unit->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);
-
- job_print_status_message(u, t, result);
-
- /* 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->dependencies[UNIT_REQUIRED_BY], i)
- if (other->job &&
- (other->job->type == JOB_START ||
- other->job->type == JOB_VERIFY_ACTIVE ||
- other->job->type == JOB_RELOAD_OR_START)) {
- job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
- recursed = true;
- }
-
- SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
- if (other->job &&
- (other->job->type == JOB_START ||
- other->job->type == JOB_VERIFY_ACTIVE ||
- other->job->type == JOB_RELOAD_OR_START)) {
- job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
- recursed = true;
- }
-
- SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
- if (other->job &&
- !other->job->override &&
- (other->job->type == JOB_START ||
- other->job->type == JOB_VERIFY_ACTIVE ||
- other->job->type == JOB_RELOAD_OR_START)) {
- job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
- recursed = true;
- }
-
- } else if (t == JOB_STOP) {
-
- SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
- if (other->job &&
- (other->job->type == JOB_START ||
- other->job->type == JOB_VERIFY_ACTIVE ||
- other->job->type == JOB_RELOAD_OR_START)) {
- job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
- recursed = true;
- }
- }
- }
-
- /* 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) {
- log_notice("Job %s/%s failed with result '%s'.",
- u->id,
- job_type_to_string(t),
- job_result_to_string(result));
-
- unit_trigger_on_failure(u);
- }
-
-finish:
- /* Try to start the next jobs that can be started */
- SET_FOREACH(other, u->dependencies[UNIT_AFTER], i)
- if (other->job)
- job_add_to_run_queue(other->job);
- SET_FOREACH(other, u->dependencies[UNIT_BEFORE], i)
- if (other->job)
- job_add_to_run_queue(other->job);
-
- manager_check_finished(u->manager);
-
- return recursed;
-}
-
-int job_start_timer(Job *j) {
- struct itimerspec its;
- struct epoll_event ev;
- int fd, r;
- assert(j);
-
- if (j->unit->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->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->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",
- [JOB_IGNORE_REQUIREMENTS] = "ignore-requirements"
-};
-
-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);
~ianmdlvl / elogind.git / blobdiff