+
+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_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;
+
+ 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;
+ UnitType t;
+ Iterator i;
+
+ assert(j);
+ assert(j->installed);
+
+ log_debug("Job %s/%s finished, success=%s", unit_id(j->unit), job_type_to_string(j->type), yes_no(success));
+
+ /* 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",
+ unit_id(j->unit), job_type_to_string(j->type),
+ unit_id(j->unit), job_type_to_string(JOB_START));
+
+ j->state = JOB_RUNNING;
+ j->type = JOB_START;
+
+ job_schedule_run(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.type == JOB_START ||
+ other->meta.type == JOB_VERIFY_ACTIVE ||
+ other->meta.type == JOB_RELOAD_OR_START))
+ job_finish_and_invalidate(other->meta.job, false);
+
+ SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
+ if (other->meta.job &&
+ !other->meta.job->forced &&
+ (other->meta.type == JOB_START ||
+ other->meta.type == JOB_VERIFY_ACTIVE ||
+ other->meta.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 &&
+ (t == JOB_START ||
+ t == JOB_VERIFY_ACTIVE ||
+ t == 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_schedule_run(other->meta.job);
+ SET_FOREACH(other, u->meta.dependencies[UNIT_BEFORE], i)
+ if (other->meta.job)
+ job_schedule_run(other->meta.job);
+
+ return 0;
+}
+
+void job_schedule_run(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;
+}
+
+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);
~ianmdlvl / elogind.git / blobdiff