+++ /dev/null
-/*-*- 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 "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;
-
- /* 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);
-
- free(j);
-}
-
-JobDependency* job_dependency_new(Job *subject, Job *object, bool matters) {
- 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
- * explcitily asked for) is the requester. */
-
- if (!(l = new0(JobDependency, 1)))
- return NULL;
-
- l->subject = subject;
- l->object = object;
- l->matters = matters;
-
- 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_dependency_delete(Job *subject, Job *object, bool *matters) {
- JobDependency *l;
-
- assert(object);
-
- LIST_FOREACH(object, l, object->object_list) {
- assert(l->object == object);
-
- if (l->subject == subject)
- break;
- }
-
- if (!l) {
- if (matters)
- *matters = false;
- return;
- }
-
- if (matters)
- *matters = l->matters;
-
- job_dependency_free(l);
-}
-
-void job_dump(Job *j, FILE*f, const char *prefix) {
-
-
- assert(j);
- assert(f);
-
- 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_ACTIVE_RELOADING;
-
- case JOB_STOP:
- return
- b == UNIT_INACTIVE;
-
- case JOB_VERIFY_ACTIVE:
- return
- b == UNIT_ACTIVE ||
- b == UNIT_ACTIVE_RELOADING;
-
- case JOB_RELOAD:
- return
- b == UNIT_ACTIVE_RELOADING;
-
- case JOB_RELOAD_OR_START:
- return
- b == UNIT_ACTIVATING ||
- b == UNIT_ACTIVE_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
- * . */
-
- 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;
-
- 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);
-
- switch (j->type) {
-
- case JOB_START:
- r = unit_start(j->unit);
- 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);
- break;
-
- case JOB_RELOAD:
- r = unit_reload(j->unit);
- break;
-
- case JOB_RELOAD_OR_START:
- if (unit_active_state(j->unit) == UNIT_ACTIVE)
- r = unit_reload(j->unit);
- else
- r = unit_start(j->unit);
- break;
-
- case JOB_RESTART: {
- UnitActiveState t = unit_active_state(j->unit);
- if (t == UNIT_INACTIVE || 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_DEACTIVATING)
- r = -ENOEXEC;
- else if (t == UNIT_ACTIVATING) {
- j->type = JOB_START;
- r = unit_start(j->unit);
- } else
- r = unit_stop(j->unit);
- break;
- }
-
- default:
- assert_not_reached("Unknown job type");
- }
-
- if (r == -EALREADY)
- r = job_finish_and_invalidate(j, true);
- else if (r == -EAGAIN) {
- j->state = JOB_WAITING;
- return -EAGAIN;
- } else if (r < 0)
- r = job_finish_and_invalidate(j, false);
-
- return r;
-}
-
-int job_finish_and_invalidate(Job *j, bool success) {
- Unit *u;
- Unit *other;
- JobType t;
- Iterator i;
-
- assert(j);
- assert(j->installed);
-
- log_debug("Job %s/%s finished, success=%s", j->unit->meta.id, job_type_to_string(j->type), yes_no(success));
- job_add_to_dbus_queue(j);
-
- /* Patch restart jobs so that they become normal start jobs */
- if (success && (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_RUNNING;
- j->type = JOB_START;
-
- job_add_to_run_queue(j);
- return 0;
- }
-
- u = j->unit;
- t = j->type;
- job_free(j);
-
- /* Fail depending jobs on failure */
- if (!success) {
-
- 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, false);
-
- 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, false);
-
- } else if (t == JOB_STOP) {
-
- SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], 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, false);
- }
- }
-
- /* 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);
-
- return 0;
-}
-
-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;
-
- if (set_isempty(j->manager->subscribed)) {
- j->sent_dbus_new_signal = true;
- return;
- }
-
- 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;
-}
-
-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"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(job_mode, JobMode);
~ianmdlvl / elogind.git / blobdiff