/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include "sd-id128.h" #include "sd-messages.h" #include "alloc-util.h" #include "async.h" #include "cgroup.h" #include "dbus-job.h" #include "dbus.h" #include "escape.h" #include "fileio.h" #include "job.h" #include "log.h" #include "macro.h" #include "parse-util.h" #include "serialize.h" #include "set.h" #include "sort-util.h" #include "special.h" #include "stdio-util.h" #include "string-table.h" #include "string-util.h" #include "strv.h" #include "terminal-util.h" #include "unit.h" #include "virt.h" Job* job_new_raw(Unit *unit) { Job *j; /* used for deserialization */ assert(unit); j = new(Job, 1); if (!j) return NULL; *j = (Job) { .manager = unit->manager, .unit = unit, .type = _JOB_TYPE_INVALID, }; return j; } static uint32_t manager_get_new_job_id(Manager *m) { bool overflow = false; assert(m); for (;;) { uint32_t id = m->current_job_id; if (_unlikely_(id == UINT32_MAX)) { assert_se(!overflow); m->current_job_id = 1; overflow = true; } else m->current_job_id++; if (hashmap_contains(m->jobs, UINT32_TO_PTR(id))) continue; return id; } } Job* job_new(Unit *unit, JobType type) { Job *j; assert(type < _JOB_TYPE_MAX); j = job_new_raw(unit); if (!j) return NULL; j->id = manager_get_new_job_id(j->manager); j->type = type; /* We don't link it here, that's what job_dependency() is for */ return j; } void job_unlink(Job *j) { assert(j); assert(!j->installed); assert(!j->transaction_prev); assert(!j->transaction_next); assert(!j->subject_list); assert(!j->object_list); if (j->in_run_queue) { prioq_remove(j->manager->run_queue, j, &j->run_queue_idx); j->in_run_queue = false; } if (j->in_dbus_queue) { LIST_REMOVE(dbus_queue, j->manager->dbus_job_queue, j); j->in_dbus_queue = false; } if (j->in_gc_queue) { LIST_REMOVE(gc_queue, j->manager->gc_job_queue, j); j->in_gc_queue = false; } j->timer_event_source = sd_event_source_disable_unref(j->timer_event_source); } Job* job_free(Job *j) { assert(j); assert(!j->installed); assert(!j->transaction_prev); assert(!j->transaction_next); assert(!j->subject_list); assert(!j->object_list); job_unlink(j); sd_bus_track_unref(j->bus_track); strv_free(j->deserialized_clients); activation_details_unref(j->activation_details); return mfree(j); } static void job_set_state(Job *j, JobState state) { assert(j); assert(state >= 0); assert(state < _JOB_STATE_MAX); if (j->state == state) return; j->state = state; if (!j->installed) return; if (j->state == JOB_RUNNING) j->unit->manager->n_running_jobs++; else { assert(j->state == JOB_WAITING); assert(j->unit->manager->n_running_jobs > 0); j->unit->manager->n_running_jobs--; if (j->unit->manager->n_running_jobs <= 0) j->unit->manager->jobs_in_progress_event_source = sd_event_source_disable_unref(j->unit->manager->jobs_in_progress_event_source); } } void job_uninstall(Job *j) { Job **pj; assert(j->installed); job_set_state(j, JOB_WAITING); pj = j->type == JOB_NOP ? &j->unit->nop_job : &j->unit->job; assert(*pj == j); /* Detach from next 'bigger' objects */ /* daemon-reload should be transparent to job observers */ if (!MANAGER_IS_RELOADING(j->manager)) bus_job_send_removed_signal(j); *pj = NULL; unit_add_to_gc_queue(j->unit); unit_add_to_dbus_queue(j->unit); /* The Job property of the unit has changed now */ hashmap_remove_value(j->manager->jobs, UINT32_TO_PTR(j->id), j); j->installed = false; } static bool job_type_allows_late_merge(JobType t) { /* Tells whether it is OK to merge a job of type 't' with an already * running job. * Reloads cannot be merged this way. Think of the sequence: * 1. Reload of a daemon is in progress; the daemon has already loaded * its config file, but hasn't completed the reload operation yet. * 2. Edit foo's config file. * 3. Trigger another reload to have the daemon use the new config. * Should the second reload job be merged into the first one, the daemon * would not know about the new config. * JOB_RESTART jobs on the other hand can be merged, because they get * patched into JOB_START after stopping the unit. So if we see a * JOB_RESTART running, it means the unit hasn't stopped yet and at * this time the merge is still allowed. */ return t != JOB_RELOAD; } static void job_merge_into_installed(Job *j, Job *other) { assert(j->installed); assert(j->unit == other->unit); if (j->type != JOB_NOP) { assert_se(job_type_merge_and_collapse(&j->type, other->type, j->unit) == 0); /* Keep the oldest ActivationDetails, if any */ if (!j->activation_details) j->activation_details = TAKE_PTR(other->activation_details); } else assert(other->type == JOB_NOP); j->irreversible = j->irreversible || other->irreversible; j->ignore_order = j->ignore_order || other->ignore_order; } Job* job_install(Job *j, bool refuse_late_merge) { Job **pj; Job *uj; assert(j); assert(!j->installed); assert(j->type < _JOB_TYPE_MAX_IN_TRANSACTION); assert(j->state == JOB_WAITING); pj = j->type == JOB_NOP ? &j->unit->nop_job : &j->unit->job; uj = *pj; if (uj) { if (job_type_is_conflicting(uj->type, j->type)) job_finish_and_invalidate(uj, JOB_CANCELED, false, false); else { /* not conflicting, i.e. mergeable */ if (uj->state == JOB_WAITING || (!refuse_late_merge && job_type_allows_late_merge(j->type) && job_type_is_superset(uj->type, j->type))) { job_merge_into_installed(uj, j); log_unit_debug(uj->unit, "Merged %s/%s into installed job %s/%s as %"PRIu32, j->unit->id, job_type_to_string(j->type), uj->unit->id, job_type_to_string(uj->type), uj->id); return uj; } else { /* already running and not safe to merge into */ /* Patch uj to become a merged job and re-run it. */ /* XXX It should be safer to queue j to run after uj finishes, but it is * not currently possible to have more than one installed job per unit. */ job_merge_into_installed(uj, j); log_unit_debug(uj->unit, "Merged into running job, re-running: %s/%s as %"PRIu32, uj->unit->id, job_type_to_string(uj->type), uj->id); job_set_state(uj, JOB_WAITING); return uj; } } } /* Install the job */ assert(!*pj); *pj = j; j->installed = true; j->manager->n_installed_jobs++; log_unit_debug(j->unit, "Installed new job %s/%s as %u", j->unit->id, job_type_to_string(j->type), (unsigned) j->id); job_add_to_gc_queue(j); job_add_to_dbus_queue(j); /* announce this job to clients */ unit_add_to_dbus_queue(j->unit); /* The Job property of the unit has changed now */ return j; } int job_install_deserialized(Job *j) { Job **pj; int r; assert(!j->installed); if (j->type < 0 || j->type >= _JOB_TYPE_MAX_IN_TRANSACTION) return log_unit_debug_errno(j->unit, SYNTHETIC_ERRNO(EINVAL), "Invalid job type %s in deserialization.", strna(job_type_to_string(j->type))); pj = j->type == JOB_NOP ? &j->unit->nop_job : &j->unit->job; if (*pj) return log_unit_debug_errno(j->unit, SYNTHETIC_ERRNO(EEXIST), "Unit already has a job installed. Not installing deserialized job."); /* When the job does not have ID, or we failed to deserialize the job ID, then use a new ID. */ if (j->id <= 0) j->id = manager_get_new_job_id(j->manager); r = hashmap_ensure_put(&j->manager->jobs, NULL, UINT32_TO_PTR(j->id), j); if (r == -EEXIST) return log_unit_debug_errno(j->unit, r, "Job ID %" PRIu32 " already used, cannot deserialize job.", j->id); if (r < 0) return log_unit_debug_errno(j->unit, r, "Failed to insert job into jobs hash table: %m"); *pj = j; j->installed = true; if (j->state == JOB_RUNNING) j->unit->manager->n_running_jobs++; log_unit_debug(j->unit, "Reinstalled deserialized job %s/%s as %u", j->unit->id, job_type_to_string(j->type), (unsigned) j->id); return 0; } 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. */ l = new0(JobDependency, 1); if (!l) return NULL; l->subject = subject; l->object = object; l->matters = matters; l->conflicts = conflicts; if (subject) LIST_PREPEND(subject, subject->subject_list, l); LIST_PREPEND(object, object->object_list, l); return l; } void job_dependency_free(JobDependency *l) { assert(l); if (l->subject) LIST_REMOVE(subject, l->subject->subject_list, l); LIST_REMOVE(object, l->object->object_list, l); free(l); } void job_dump(Job *j, FILE *f, const char *prefix) { assert(j); assert(f); prefix = strempty(prefix); fprintf(f, "%s-> Job %u:\n" "%s\tAction: %s -> %s\n" "%s\tState: %s\n" "%s\tIrreversible: %s\n" "%s\tMay GC: %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->irreversible), prefix, yes_no(job_may_gc(j))); } /* * 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. * * If the resulting type is collapsed immediately afterwards (to get rid of * the JOB_RELOAD_OR_START, which lies outside the lookup function's domain), * the following properties hold: * * Merging is associative! A merged with B, and then merged with C is the same * as A merged with the result of B merged with C. * * 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_START */ /*JOB_VERIFY_ACTIVE */ JOB_START, /*JOB_STOP */ -1, -1, /*JOB_RELOAD */ JOB_RELOAD_OR_START, JOB_RELOAD, -1, /*JOB_RESTART */ JOB_RESTART, JOB_RESTART, -1, JOB_RESTART, }; JobType job_type_lookup_merge(JobType a, JobType b) { assert_cc(ELEMENTSOF(job_merging_table) == _JOB_TYPE_MAX_MERGING * (_JOB_TYPE_MAX_MERGING - 1) / 2); assert(a >= 0 && a < _JOB_TYPE_MAX_MERGING); assert(b >= 0 && b < _JOB_TYPE_MAX_MERGING); 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 IN_SET(b, UNIT_ACTIVE, UNIT_RELOADING); case JOB_STOP: return IN_SET(b, UNIT_INACTIVE, UNIT_FAILED); case JOB_VERIFY_ACTIVE: return IN_SET(b, UNIT_ACTIVE, UNIT_RELOADING); case JOB_RELOAD: return b == UNIT_RELOADING; case JOB_RESTART: /* Restart jobs must always be kept. * * For ACTIVE/RELOADING units, this is obvious. * * For ACTIVATING units, it's more subtle: * * Generally, if a service Requires= another unit, restarts of * the unit must be propagated to the service. If the service is * ACTIVATING, it must still be restarted since it might have * stale information regarding the other unit. * * For example, consider a service that Requires= a socket: if * the socket is restarted, but the service is still ACTIVATING, * it's necessary to restart the service so that it gets the new * socket. */ return false; case JOB_NOP: return true; default: assert_not_reached(); } } JobType job_type_collapse(JobType t, Unit *u) { UnitActiveState s; switch (t) { case JOB_TRY_RESTART: /* Be sure to keep the restart job even if the unit is * ACTIVATING. * * See the job_type_is_redundant(JOB_RESTART) for more info */ s = unit_active_state(u); if (!UNIT_IS_ACTIVE_OR_ACTIVATING(s)) return JOB_NOP; return JOB_RESTART; case JOB_TRY_RELOAD: s = unit_active_state(u); if (!UNIT_IS_ACTIVE_OR_RELOADING(s)) return JOB_NOP; return JOB_RELOAD; case JOB_RELOAD_OR_START: s = unit_active_state(u); if (!UNIT_IS_ACTIVE_OR_RELOADING(s)) return JOB_START; return JOB_RELOAD; default: return t; } } int job_type_merge_and_collapse(JobType *a, JobType b, Unit *u) { JobType t; t = job_type_lookup_merge(*a, b); if (t < 0) return -EEXIST; *a = job_type_collapse(t, u); return 0; } static bool job_is_runnable(Job *j) { 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. */ /* Note that unit types have a say in what is runnable, * too. For example, if they return -EAGAIN from * unit_start() they can indicate they are not * runnable yet. */ /* First check if there is an override */ if (j->ignore_order) return true; if (j->type == JOB_NOP) return true; UNIT_FOREACH_DEPENDENCY(other, j->unit, UNIT_ATOM_AFTER) if (other->job && job_compare(j, other->job, UNIT_ATOM_AFTER) > 0) { log_unit_debug(j->unit, "starting held back, waiting for: %s", other->id); return false; } UNIT_FOREACH_DEPENDENCY(other, j->unit, UNIT_ATOM_BEFORE) if (other->job && job_compare(j, other->job, UNIT_ATOM_BEFORE) > 0) { log_unit_debug(j->unit, "stopping held back, waiting for: %s", other->id); return false; } return true; } static void job_change_type(Job *j, JobType newtype) { assert(j); log_unit_debug(j->unit, "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; } static const char* job_start_message_format(Unit *u, JobType t) { assert(u); assert(IN_SET(t, JOB_START, JOB_STOP, JOB_RELOAD)); if (t == JOB_RELOAD) return "Reloading %s..."; else if (t == JOB_START) return UNIT_VTABLE(u)->status_message_formats.starting_stopping[0] ?: "Starting %s..."; else return UNIT_VTABLE(u)->status_message_formats.starting_stopping[1] ?: "Stopping %s..."; } static void job_emit_start_message(Unit *u, uint32_t job_id, JobType t) { _cleanup_free_ char *free_ident = NULL; const char *ident, *format; assert(u); assert(t >= 0); assert(t < _JOB_TYPE_MAX); assert(u->id); /* We better don't try to run a unit that doesn't even have an id. */ if (!IN_SET(t, JOB_START, JOB_STOP, JOB_RELOAD)) return; if (!unit_log_level_test(u, LOG_INFO)) return; format = job_start_message_format(u, t); ident = unit_status_string(u, &free_ident); bool do_console = t != JOB_RELOAD; bool console_only = do_console && log_on_console(); /* Reload status messages have traditionally * not been printed to the console. */ /* Print to the log first. */ if (!console_only) { /* Skip this if it would only go on the console anyway */ const char *mid = t == JOB_START ? "MESSAGE_ID=" SD_MESSAGE_UNIT_STARTING_STR : t == JOB_STOP ? "MESSAGE_ID=" SD_MESSAGE_UNIT_STOPPING_STR : "MESSAGE_ID=" SD_MESSAGE_UNIT_RELOADING_STR; const char *msg_fmt = strjoina("MESSAGE=", format); /* Note that we deliberately use LOG_MESSAGE() instead of LOG_UNIT_MESSAGE() here, since this * is supposed to mimic closely what is written to screen using the status output, which is * supposed to be high level friendly output. */ DISABLE_WARNING_FORMAT_NONLITERAL; log_unit_struct(u, LOG_INFO, msg_fmt, ident, "JOB_ID=%" PRIu32, job_id, "JOB_TYPE=%s", job_type_to_string(t), LOG_UNIT_INVOCATION_ID(u), mid); REENABLE_WARNING; } /* Log to the console second. */ if (do_console) { DISABLE_WARNING_FORMAT_NONLITERAL; unit_status_printf(u, STATUS_TYPE_NORMAL, "", format, ident); REENABLE_WARNING; } } static const char* job_done_message_format(Unit *u, JobType t, JobResult result) { static const char* const generic_finished_start_job[_JOB_RESULT_MAX] = { [JOB_DONE] = "Started %s.", [JOB_TIMEOUT] = "Timed out starting %s.", [JOB_FAILED] = "Failed to start %s.", [JOB_DEPENDENCY] = "Dependency failed for %s.", [JOB_ASSERT] = "Assertion failed for %s.", [JOB_UNSUPPORTED] = "Starting of %s unsupported.", [JOB_COLLECTED] = "Unnecessary job was removed for %s.", [JOB_ONCE] = "Unit %s has been started before and cannot be started again.", [JOB_FROZEN] = "Cannot start frozen unit %s.", }; static const char* const generic_finished_stop_job[_JOB_RESULT_MAX] = { [JOB_DONE] = "Stopped %s.", [JOB_FAILED] = "Stopped %s with error.", [JOB_TIMEOUT] = "Timed out stopping %s.", [JOB_FROZEN] = "Cannot stop frozen unit %s.", }; static const char* const generic_finished_reload_job[_JOB_RESULT_MAX] = { [JOB_DONE] = "Reloaded %s.", [JOB_FAILED] = "Reload failed for %s.", [JOB_TIMEOUT] = "Timed out reloading %s.", [JOB_FROZEN] = "Cannot reload frozen unit %s.", }; /* When verify-active detects the unit is inactive, report it. * Most likely a DEPEND warning from a requisiting unit will * occur next and it's nice to see what was requisited. */ static const char* const generic_finished_verify_active_job[_JOB_RESULT_MAX] = { [JOB_SKIPPED] = "%s is inactive.", }; const char *format; assert(u); assert(t >= 0); assert(t < _JOB_TYPE_MAX); /* Show condition check message if the job did not actually do anything due to unmet condition. */ if (t == JOB_START && result == JOB_DONE && !u->condition_result) return "Condition check resulted in %s being skipped."; if (IN_SET(t, JOB_START, JOB_STOP, JOB_RESTART)) { const UnitStatusMessageFormats *formats = &UNIT_VTABLE(u)->status_message_formats; if (formats->finished_job) { format = formats->finished_job(u, t, result); if (format) return format; } format = (t == JOB_START ? formats->finished_start_job : formats->finished_stop_job)[result]; if (format) return format; } /* Return generic strings */ switch (t) { case JOB_START: return generic_finished_start_job[result]; case JOB_STOP: case JOB_RESTART: return generic_finished_stop_job[result]; case JOB_RELOAD: return generic_finished_reload_job[result]; case JOB_VERIFY_ACTIVE: return generic_finished_verify_active_job[result]; default: return NULL; } } static const struct { int log_level; const char *color, *word; } job_done_messages[_JOB_RESULT_MAX] = { [JOB_DONE] = { LOG_INFO, ANSI_OK_COLOR, " OK " }, [JOB_CANCELED] = { LOG_INFO, }, [JOB_TIMEOUT] = { LOG_ERR, ANSI_HIGHLIGHT_RED, " TIME " }, [JOB_FAILED] = { LOG_ERR, ANSI_HIGHLIGHT_RED, "FAILED" }, [JOB_DEPENDENCY] = { LOG_WARNING, ANSI_HIGHLIGHT_YELLOW, "DEPEND" }, [JOB_SKIPPED] = { LOG_NOTICE, ANSI_HIGHLIGHT, " INFO " }, [JOB_INVALID] = { LOG_INFO, }, [JOB_ASSERT] = { LOG_WARNING, ANSI_HIGHLIGHT_YELLOW, "ASSERT" }, [JOB_UNSUPPORTED] = { LOG_WARNING, ANSI_HIGHLIGHT_YELLOW, "UNSUPP" }, [JOB_COLLECTED] = { LOG_INFO, }, [JOB_ONCE] = { LOG_ERR, ANSI_HIGHLIGHT_RED, " ONCE " }, [JOB_FROZEN] = { LOG_ERR, ANSI_HIGHLIGHT_RED, "FROZEN" }, }; static const char* job_done_mid(JobType type, JobResult result) { switch (type) { case JOB_START: if (result == JOB_DONE) return "MESSAGE_ID=" SD_MESSAGE_UNIT_STARTED_STR; else return "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILED_STR; case JOB_RELOAD: return "MESSAGE_ID=" SD_MESSAGE_UNIT_RELOADED_STR; case JOB_STOP: case JOB_RESTART: return "MESSAGE_ID=" SD_MESSAGE_UNIT_STOPPED_STR; default: return NULL; } } static void job_emit_done_message(Unit *u, uint32_t job_id, JobType t, JobResult result) { _cleanup_free_ char *free_ident = NULL; const char *ident, *format; assert(u); assert(t >= 0); assert(t < _JOB_TYPE_MAX); if (!unit_log_level_test(u, job_done_messages[result].log_level)) return; format = job_done_message_format(u, t, result); if (!format) return; ident = unit_status_string(u, &free_ident); const char *status = job_done_messages[result].word; bool do_console = t != JOB_RELOAD && status; bool console_only = do_console && log_on_console(); if (t == JOB_START && result == JOB_DONE && !u->condition_result) { /* No message on the console if the job did not actually do anything due to unmet condition. */ if (console_only) return; else do_console = false; } if (!console_only) { /* Skip printing if output goes to the console, and job_print_status_message() * will actually print something to the console. */ Condition *c; const char *mid = job_done_mid(t, result); /* mid may be NULL. log_unit_struct() will ignore it. */ c = t == JOB_START && result == JOB_DONE ? unit_find_failed_condition(u) : NULL; if (c) { /* Special case units that were skipped because of a unmet condition check so that * we can add more information to the message. */ if (c->trigger) log_unit_struct( u, job_done_messages[result].log_level, LOG_MESSAGE("%s was skipped because no trigger condition checks were met.", ident), "JOB_ID=%" PRIu32, job_id, "JOB_TYPE=%s", job_type_to_string(t), "JOB_RESULT=%s", job_result_to_string(result), LOG_UNIT_INVOCATION_ID(u), mid); else log_unit_struct( u, job_done_messages[result].log_level, LOG_MESSAGE("%s was skipped because of an unmet condition check (%s=%s%s).", ident, condition_type_to_string(c->type), c->negate ? "!" : "", c->parameter), "JOB_ID=%" PRIu32, job_id, "JOB_TYPE=%s", job_type_to_string(t), "JOB_RESULT=%s", job_result_to_string(result), LOG_UNIT_INVOCATION_ID(u), mid); } else { const char *msg_fmt = strjoina("MESSAGE=", format); DISABLE_WARNING_FORMAT_NONLITERAL; log_unit_struct(u, job_done_messages[result].log_level, msg_fmt, ident, "JOB_ID=%" PRIu32, job_id, "JOB_TYPE=%s", job_type_to_string(t), "JOB_RESULT=%s", job_result_to_string(result), LOG_UNIT_INVOCATION_ID(u), mid); REENABLE_WARNING; } } if (do_console) { if (log_get_show_color()) status = strjoina(job_done_messages[result].color, status, ANSI_NORMAL); DISABLE_WARNING_FORMAT_NONLITERAL; unit_status_printf(u, result == JOB_DONE ? STATUS_TYPE_NORMAL : STATUS_TYPE_NOTICE, status, format, ident); REENABLE_WARNING; if (t == JOB_START && result == JOB_FAILED) { _cleanup_free_ char *quoted = NULL; quoted = shell_maybe_quote(u->id, 0); if (quoted) manager_status_printf(u->manager, STATUS_TYPE_NORMAL, NULL, "See 'systemctl status %s' for details.", quoted); } } } static int job_perform_on_unit(Job **j) { ActivationDetails *a; uint32_t id; Manager *m; JobType t; Unit *u; bool wait_only; int r; /* While we execute this operation the job might go away (for example: because it finishes immediately * or 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. */ assert(j); assert(*j); m = (*j)->manager; u = (*j)->unit; t = (*j)->type; id = (*j)->id; a = (*j)->activation_details; switch (t) { case JOB_START: r = unit_start(u, a); wait_only = r == -EBADR; /* If the unit type does not support starting, then simply wait. */ break; case JOB_RESTART: t = JOB_STOP; _fallthrough_; case JOB_STOP: r = unit_stop(u); wait_only = r == -EBADR; /* If the unit type does not support stopping, then simply wait. */ break; case JOB_RELOAD: r = unit_reload(u); wait_only = false; /* A clear error is generated if reload is not supported. */ break; default: assert_not_reached(); } /* Log if the job still exists and the start/stop/reload function actually did something or we're * only waiting for unit status change (common for device units). The latter ensures that job start * messages for device units are correctly shown. Note that if the job disappears too quickly, e.g. * for units for which there's no 'activating' phase (i.e. because we transition directly from * 'inactive' to 'active'), we'll possibly skip the "Starting..." message. */ *j = manager_get_job(m, id); if (*j && (r > 0 || wait_only)) job_emit_start_message(u, id, t); return wait_only ? 0 : r; } int job_run_and_invalidate(Job *j) { int r; assert(j); assert(j->installed); assert(j->type < _JOB_TYPE_MAX_IN_TRANSACTION); assert(j->in_run_queue); prioq_remove(j->manager->run_queue, j, &j->run_queue_idx); j->in_run_queue = false; if (j->state != JOB_WAITING) return 0; if (!job_is_runnable(j)) return -EAGAIN; job_start_timer(j, true); job_set_state(j, JOB_RUNNING); job_add_to_dbus_queue(j); switch (j->type) { case JOB_VERIFY_ACTIVE: { UnitActiveState t; t = unit_active_state(j->unit); if (UNIT_IS_ACTIVE_OR_RELOADING(t)) r = -EALREADY; else if (t == UNIT_ACTIVATING) r = -EAGAIN; else r = -EBADR; break; } case JOB_START: case JOB_STOP: case JOB_RESTART: case JOB_RELOAD: r = job_perform_on_unit(&j); break; case JOB_NOP: r = -EALREADY; break; default: assert_not_reached(); } if (j) { if (r == -EAGAIN) job_set_state(j, JOB_WAITING); /* Hmm, not ready after all, let's return to JOB_WAITING state */ else if (r == -EALREADY) /* already being executed */ r = job_finish_and_invalidate(j, JOB_DONE, true, true); else if (r == -ECOMM) r = job_finish_and_invalidate(j, JOB_DONE, true, false); else if (r == -EBADR) r = job_finish_and_invalidate(j, JOB_SKIPPED, true, false); else if (r == -ENOEXEC) r = job_finish_and_invalidate(j, JOB_INVALID, true, false); else if (r == -EPROTO) r = job_finish_and_invalidate(j, JOB_ASSERT, true, false); else if (r == -EOPNOTSUPP) r = job_finish_and_invalidate(j, JOB_UNSUPPORTED, true, false); else if (r == -ENOLINK) r = job_finish_and_invalidate(j, JOB_DEPENDENCY, true, false); else if (r == -ESTALE) r = job_finish_and_invalidate(j, JOB_ONCE, true, false); else if (r == -EDEADLK) r = job_finish_and_invalidate(j, JOB_FROZEN, true, false); else if (r < 0) r = job_finish_and_invalidate(j, JOB_FAILED, true, false); } return r; } static void job_fail_dependencies(Unit *u, UnitDependencyAtom match_atom) { Unit *other; assert(u); UNIT_FOREACH_DEPENDENCY(other, u, match_atom) { Job *j = other->job; if (!j) continue; if (!IN_SET(j->type, JOB_START, JOB_VERIFY_ACTIVE)) continue; job_finish_and_invalidate(j, JOB_DEPENDENCY, true, false); } } int job_finish_and_invalidate(Job *j, JobResult result, bool recursive, bool already) { Unit *u, *other; JobType t; assert(j); assert(j->installed); assert(j->type < _JOB_TYPE_MAX_IN_TRANSACTION); u = j->unit; t = j->type; j->result = result; log_unit_debug(u, "Job %" PRIu32 " %s/%s finished, result=%s", j->id, u->id, job_type_to_string(t), job_result_to_string(result)); /* If this job did nothing to the respective unit we don't log the status message */ if (!already) job_emit_done_message(u, j->id, t, result); /* Patch restart jobs so that they become normal start jobs */ if (result == JOB_DONE && t == JOB_RESTART) { job_change_type(j, JOB_START); job_set_state(j, JOB_WAITING); job_add_to_dbus_queue(j); job_add_to_run_queue(j); job_add_to_gc_queue(j); goto finish; } if (IN_SET(result, JOB_FAILED, JOB_INVALID, JOB_FROZEN)) j->manager->n_failed_jobs++; job_uninstall(j); job_free(j); /* Fail depending jobs on failure */ if (result != JOB_DONE && recursive) { if (IN_SET(t, JOB_START, JOB_VERIFY_ACTIVE)) job_fail_dependencies(u, UNIT_ATOM_PROPAGATE_START_FAILURE); else if (t == JOB_STOP) job_fail_dependencies(u, UNIT_ATOM_PROPAGATE_STOP_FAILURE); } /* A special check to make sure we take down anything RequisiteOf= if we aren't active. This is when * the verify-active job merges with a satisfying job type, and then loses its invalidation effect, * as the result there is JOB_DONE for the start job we merged into, while we should be failing the * depending job if the said unit isn't in fact active. Oneshots are an example of this, where going * directly from activating to inactive is success. * * This happens when you use ConditionXYZ= in a unit too, since in that case the job completes with * the JOB_DONE result, but the unit never really becomes active. Note that such a case still * involves merging: * * A start job waits for something else, and a verify-active comes in and merges in the installed * job. Then, later, when it becomes runnable, it finishes with JOB_DONE result as execution on * conditions not being met is skipped, breaking our dependency semantics. * * Also, depending on if start job waits or not, the merging may or may not happen (the verify-active * job may trigger after it finishes), so you get undeterministic results without this check. */ if (result == JOB_DONE && recursive && IN_SET(t, JOB_START, JOB_RELOAD) && !UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) job_fail_dependencies(u, UNIT_ATOM_PROPAGATE_INACTIVE_START_AS_FAILURE); /* Trigger OnFailure= dependencies that are not generated by the unit itself. We don't treat * JOB_CANCELED as failure in this context. And JOB_FAILURE is already handled by the unit itself. */ if (IN_SET(result, JOB_TIMEOUT, JOB_DEPENDENCY)) { log_unit_struct(u, LOG_NOTICE, "JOB_TYPE=%s", job_type_to_string(t), "JOB_RESULT=%s", job_result_to_string(result), LOG_UNIT_MESSAGE(u, "Job %s/%s failed with result '%s'.", u->id, job_type_to_string(t), job_result_to_string(result))); unit_start_on_failure(u, "OnFailure=", UNIT_ATOM_ON_FAILURE, u->on_failure_job_mode); } unit_trigger_notify(u); finish: /* Try to start the next jobs that can be started */ UNIT_FOREACH_DEPENDENCY(other, u, UNIT_ATOM_AFTER) if (other->job) { job_add_to_run_queue(other->job); job_add_to_gc_queue(other->job); } UNIT_FOREACH_DEPENDENCY(other, u, UNIT_ATOM_BEFORE) if (other->job) { job_add_to_run_queue(other->job); job_add_to_gc_queue(other->job); } /* Ensure that when an upheld/unneeded/bound unit activation job fails we requeue it, if it still * necessary. If there are no state changes in the triggerer, it would not be retried otherwise. */ unit_submit_to_start_when_upheld_queue(u); unit_submit_to_stop_when_bound_queue(u); unit_submit_to_stop_when_unneeded_queue(u); manager_check_finished(u->manager); return 0; } static int job_dispatch_timer(sd_event_source *s, uint64_t monotonic, void *userdata) { Job *j = ASSERT_PTR(userdata); Unit *u; assert(s == j->timer_event_source); log_unit_warning(j->unit, "Job %s/%s timed out.", j->unit->id, job_type_to_string(j->type)); u = j->unit; job_finish_and_invalidate(j, JOB_TIMEOUT, true, false); emergency_action(u->manager, u->job_timeout_action, EMERGENCY_ACTION_IS_WATCHDOG|EMERGENCY_ACTION_WARN, u->job_timeout_reboot_arg, -1, "job timed out"); return 0; } int job_start_timer(Job *j, bool job_running) { int r; usec_t timeout_time, old_timeout_time; if (job_running) { j->begin_running_usec = now(CLOCK_MONOTONIC); if (j->unit->job_running_timeout == USEC_INFINITY) return 0; timeout_time = usec_add(j->begin_running_usec, j->unit->job_running_timeout); if (j->timer_event_source) { /* Update only if JobRunningTimeoutSec= results in earlier timeout */ r = sd_event_source_get_time(j->timer_event_source, &old_timeout_time); if (r < 0) return r; if (old_timeout_time <= timeout_time) return 0; return sd_event_source_set_time(j->timer_event_source, timeout_time); } } else { if (j->timer_event_source) return 0; j->begin_usec = now(CLOCK_MONOTONIC); if (j->unit->job_timeout == USEC_INFINITY) return 0; timeout_time = usec_add(j->begin_usec, j->unit->job_timeout); } r = sd_event_add_time( j->manager->event, &j->timer_event_source, CLOCK_MONOTONIC, timeout_time, 0, job_dispatch_timer, j); if (r < 0) return r; (void) sd_event_source_set_description(j->timer_event_source, "job-start"); return 0; } void job_add_to_run_queue(Job *j) { int r; assert(j); assert(j->installed); if (j->in_run_queue) return; r = prioq_put(j->manager->run_queue, j, &j->run_queue_idx); if (r < 0) log_warning_errno(r, "Failed put job in run queue, ignoring: %m"); else j->in_run_queue = true; manager_trigger_run_queue(j->manager); } 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(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/%"PRIu32, j->id) < 0) return NULL; return p; } int job_serialize(Job *j, FILE *f) { assert(j); assert(f); (void) serialize_item_format(f, "job-id", "%u", j->id); (void) serialize_item(f, "job-type", job_type_to_string(j->type)); (void) serialize_item(f, "job-state", job_state_to_string(j->state)); (void) serialize_bool(f, "job-irreversible", j->irreversible); (void) serialize_bool(f, "job-sent-dbus-new-signal", j->sent_dbus_new_signal); (void) serialize_bool(f, "job-ignore-order", j->ignore_order); if (j->begin_usec > 0) (void) serialize_usec(f, "job-begin", j->begin_usec); if (j->begin_running_usec > 0) (void) serialize_usec(f, "job-begin-running", j->begin_running_usec); bus_track_serialize(j->bus_track, f, "subscribed"); activation_details_serialize(j->activation_details, f); /* End marker */ fputc('\n', f); return 0; } int job_deserialize(Job *j, FILE *f) { int r; assert(j); assert(f); for (;;) { _cleanup_free_ char *l = NULL; size_t k; char *v; r = deserialize_read_line(f, &l); if (r < 0) return r; if (r == 0) /* eof or end marker */ break; k = strcspn(l, "="); if (l[k] == '=') { l[k] = 0; v = l+k+1; } else v = l+k; if (streq(l, "job-id")) { if (safe_atou32(v, &j->id) < 0) log_debug("Failed to parse job id value: %s", v); } else if (streq(l, "job-type")) { JobType t; t = job_type_from_string(v); if (t < 0) log_debug("Failed to parse job type: %s", v); else if (t >= _JOB_TYPE_MAX_IN_TRANSACTION) log_debug("Cannot deserialize job of type: %s", v); else j->type = t; } else if (streq(l, "job-state")) { JobState s; s = job_state_from_string(v); if (s < 0) log_debug("Failed to parse job state: %s", v); else job_set_state(j, s); } else if (streq(l, "job-irreversible")) { int b; b = parse_boolean(v); if (b < 0) log_debug("Failed to parse job irreversible flag: %s", v); else j->irreversible = j->irreversible || b; } else if (streq(l, "job-sent-dbus-new-signal")) { int b; b = parse_boolean(v); if (b < 0) log_debug("Failed to parse job sent_dbus_new_signal flag: %s", v); else j->sent_dbus_new_signal = j->sent_dbus_new_signal || b; } else if (streq(l, "job-ignore-order")) { int b; b = parse_boolean(v); if (b < 0) log_debug("Failed to parse job ignore_order flag: %s", v); else j->ignore_order = j->ignore_order || b; } else if (streq(l, "job-begin")) (void) deserialize_usec(v, &j->begin_usec); else if (streq(l, "job-begin-running")) (void) deserialize_usec(v, &j->begin_running_usec); else if (streq(l, "subscribed")) { if (strv_extend(&j->deserialized_clients, v) < 0) return log_oom(); } else if (startswith(l, "activation-details")) { if (activation_details_deserialize(l, v, &j->activation_details) < 0) log_debug("Failed to parse job ActivationDetails element: %s", v); } else log_debug("Unknown job serialization key: %s", l); } return 0; } int job_coldplug(Job *j) { int r; usec_t timeout_time = USEC_INFINITY; assert(j); /* After deserialization is complete and the bus connection * set up again, let's start watching our subscribers again */ (void) bus_job_coldplug_bus_track(j); if (j->state == JOB_WAITING) job_add_to_run_queue(j); /* Maybe due to new dependencies we don't actually need this job anymore? */ job_add_to_gc_queue(j); /* Create timer only when job began or began running and the respective timeout is finite. * Follow logic of job_start_timer() if both timeouts are finite */ if (j->begin_usec == 0) return 0; if (j->unit->job_timeout != USEC_INFINITY) timeout_time = usec_add(j->begin_usec, j->unit->job_timeout); if (timestamp_is_set(j->begin_running_usec)) timeout_time = MIN(timeout_time, usec_add(j->begin_running_usec, j->unit->job_running_timeout)); if (timeout_time == USEC_INFINITY) return 0; j->timer_event_source = sd_event_source_disable_unref(j->timer_event_source); r = sd_event_add_time( j->manager->event, &j->timer_event_source, CLOCK_MONOTONIC, timeout_time, 0, job_dispatch_timer, j); if (r < 0) log_debug_errno(r, "Failed to restart timeout for job: %m"); (void) sd_event_source_set_description(j->timer_event_source, "job-timeout"); return r; } void job_shutdown_magic(Job *j) { assert(j); /* The shutdown target gets some special treatment here: we * tell the kernel to begin with flushing its disk caches, to * optimize shutdown time a bit. Ideally we wouldn't hardcode * this magic into PID 1. However all other processes aren't * options either since they'd exit much sooner than PID 1 and * asynchronous sync() would cause their exit to be * delayed. */ if (j->type != JOB_START) return; if (!MANAGER_IS_SYSTEM(j->unit->manager)) return; if (!unit_has_name(j->unit, SPECIAL_SHUTDOWN_TARGET)) return; /* In case messages on console has been disabled on boot */ j->unit->manager->no_console_output = false; manager_invalidate_startup_units(j->unit->manager); if (detect_container() > 0) return; (void) asynchronous_sync(NULL); } int job_get_timeout(Job *j, usec_t *ret) { usec_t x = USEC_INFINITY, y = USEC_INFINITY; Unit *u = ASSERT_PTR(ASSERT_PTR(j)->unit); int r; assert(ret); if (j->timer_event_source) { r = sd_event_source_get_time(j->timer_event_source, &x); if (r < 0) return r; } if (UNIT_VTABLE(u)->get_timeout) { r = UNIT_VTABLE(u)->get_timeout(u, &y); if (r < 0) return r; } if (x == USEC_INFINITY && y == USEC_INFINITY) { *ret = 0; return 0; } *ret = MIN(x, y); return 1; } bool job_may_gc(Job *j) { Unit *other; assert(j); /* Checks whether this job should be GC'ed away. We only do this for jobs of units that have no effect on their * own and just track external state. For now the only unit type that qualifies for this are .device units. * Returns true if the job can be collected. */ if (!UNIT_VTABLE(j->unit)->gc_jobs) return false; /* Make sure to send out pending D-Bus events before we unload the unit */ if (j->in_dbus_queue) return false; if (sd_bus_track_count(j->bus_track) > 0) return false; /* FIXME: So this is a bit ugly: for now we don't properly track references made via private bus connections * (because it's nasty, as sd_bus_track doesn't apply to it). We simply remember that the job was once * referenced by one, and reset this whenever we notice that no private bus connections are around. This means * the GC is a bit too conservative when it comes to jobs created by private bus connections. */ if (j->ref_by_private_bus) { if (set_isempty(j->unit->manager->private_buses)) j->ref_by_private_bus = false; else return false; } if (j->type == JOB_NOP) return false; /* The logic is inverse to job_is_runnable, we cannot GC as long as we block any job. */ UNIT_FOREACH_DEPENDENCY(other, j->unit, UNIT_ATOM_BEFORE) if (other->job && job_compare(j, other->job, UNIT_ATOM_BEFORE) < 0) return false; UNIT_FOREACH_DEPENDENCY(other, j->unit, UNIT_ATOM_AFTER) if (other->job && job_compare(j, other->job, UNIT_ATOM_AFTER) < 0) return false; return true; } void job_add_to_gc_queue(Job *j) { assert(j); if (j->in_gc_queue) return; if (!job_may_gc(j)) return; LIST_PREPEND(gc_queue, j->unit->manager->gc_job_queue, j); j->in_gc_queue = true; } static int job_compare_id(Job * const *a, Job * const *b) { return CMP((*a)->id, (*b)->id); } static size_t sort_job_list(Job **list, size_t n) { Job *previous = NULL; size_t a, b; /* Order by numeric IDs */ typesafe_qsort(list, n, job_compare_id); /* Filter out duplicates */ for (a = 0, b = 0; a < n; a++) { if (previous == list[a]) continue; previous = list[b++] = list[a]; } return b; } int job_get_before(Job *j, Job*** ret) { _cleanup_free_ Job** list = NULL; Unit *other = NULL; size_t n = 0; /* Returns a list of all pending jobs that need to finish before this job may be started. */ assert(j); assert(ret); if (j->ignore_order) { *ret = NULL; return 0; } UNIT_FOREACH_DEPENDENCY(other, j->unit, UNIT_ATOM_AFTER) { if (!other->job) continue; if (job_compare(j, other->job, UNIT_ATOM_AFTER) <= 0) continue; if (!GREEDY_REALLOC(list, n+1)) return -ENOMEM; list[n++] = other->job; } UNIT_FOREACH_DEPENDENCY(other, j->unit, UNIT_ATOM_BEFORE) { if (!other->job) continue; if (job_compare(j, other->job, UNIT_ATOM_BEFORE) <= 0) continue; if (!GREEDY_REALLOC(list, n+1)) return -ENOMEM; list[n++] = other->job; } n = sort_job_list(list, n); *ret = TAKE_PTR(list); return (int) n; } int job_get_after(Job *j, Job*** ret) { _cleanup_free_ Job** list = NULL; Unit *other = NULL; size_t n = 0; assert(j); assert(ret); /* Returns a list of all pending jobs that are waiting for this job to finish. */ UNIT_FOREACH_DEPENDENCY(other, j->unit, UNIT_ATOM_BEFORE) { if (!other->job) continue; if (other->job->ignore_order) continue; if (job_compare(j, other->job, UNIT_ATOM_BEFORE) >= 0) continue; if (!GREEDY_REALLOC(list, n+1)) return -ENOMEM; list[n++] = other->job; } UNIT_FOREACH_DEPENDENCY(other, j->unit, UNIT_ATOM_AFTER) { if (!other->job) continue; if (other->job->ignore_order) continue; if (job_compare(j, other->job, UNIT_ATOM_AFTER) >= 0) continue; if (!GREEDY_REALLOC(list, n+1)) return -ENOMEM; list[n++] = other->job; } n = sort_job_list(list, n); *ret = TAKE_PTR(list); return (int) n; } 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", [JOB_TRY_RELOAD] = "try-reload", [JOB_NOP] = "nop", }; DEFINE_STRING_TABLE_LOOKUP(job_type, JobType); static const char* const job_mode_table[_JOB_MODE_MAX] = { [JOB_FAIL] = "fail", [JOB_REPLACE] = "replace", [JOB_REPLACE_IRREVERSIBLY] = "replace-irreversibly", [JOB_ISOLATE] = "isolate", [JOB_FLUSH] = "flush", [JOB_IGNORE_DEPENDENCIES] = "ignore-dependencies", [JOB_IGNORE_REQUIREMENTS] = "ignore-requirements", [JOB_TRIGGERING] = "triggering", [JOB_RESTART_DEPENDENCIES] = "restart-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", [JOB_INVALID] = "invalid", [JOB_ASSERT] = "assert", [JOB_UNSUPPORTED] = "unsupported", [JOB_COLLECTED] = "collected", [JOB_ONCE] = "once", [JOB_FROZEN] = "frozen", }; DEFINE_STRING_TABLE_LOOKUP(job_result, JobResult); const char* job_type_to_access_method(JobType t) { assert(t >= 0); assert(t < _JOB_TYPE_MAX); if (IN_SET(t, JOB_START, JOB_RESTART, JOB_TRY_RESTART)) return "start"; else if (t == JOB_STOP) return "stop"; else return "reload"; } /* * assume_dep assumed dependency between units (a is before/after b) * * Returns * 0 jobs are independent, * >0 a should run after b, * <0 a should run before b, * * The logic means that for a service a and a service b where b.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. */ int job_compare(Job *a, Job *b, UnitDependencyAtom assume_dep) { assert(a); assert(b); assert(a->type < _JOB_TYPE_MAX_IN_TRANSACTION); assert(b->type < _JOB_TYPE_MAX_IN_TRANSACTION); assert(IN_SET(assume_dep, UNIT_ATOM_AFTER, UNIT_ATOM_BEFORE)); /* Trivial cases first */ if (a->type == JOB_NOP || b->type == JOB_NOP) return 0; if (a->ignore_order || b->ignore_order) return 0; if (assume_dep == UNIT_ATOM_AFTER) return -job_compare(b, a, UNIT_ATOM_BEFORE); /* Let's make it simple, JOB_STOP goes always first (in case both ua and ub stop, then ub's stop goes * first anyway). JOB_RESTART is JOB_STOP in disguise (before it is patched to JOB_START). */ if (IN_SET(b->type, JOB_STOP, JOB_RESTART)) return 1; else return -1; } void job_set_activation_details(Job *j, ActivationDetails *info) { /* Existing (older) ActivationDetails win, newer ones are discarded. */ if (!j || j->activation_details || !info) return; /* Nothing to do. */ j->activation_details = activation_details_ref(info); }