diff options
Diffstat (limited to 'src/core/job.c')
| -rw-r--r-- | src/core/job.c | 1698 |
1 files changed, 1698 insertions, 0 deletions
diff --git a/src/core/job.c b/src/core/job.c new file mode 100644 index 0000000..f3c1a02 --- /dev/null +++ b/src/core/job.c @@ -0,0 +1,1698 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> + +#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; +} + +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 = j->manager->current_job_id++; + 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_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); + + 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_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); + 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) { + Job **pj; + Job *uj; + + 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 || + (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 */ + *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."); + + r = hashmap_ensure_allocated(&j->manager->jobs, NULL); + if (r < 0) + return r; + + r = hashmap_put(j->manager->jobs, 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: + return + b == UNIT_ACTIVATING; + + case JOB_NOP: + return true; + + default: + assert_not_reached("Invalid job type"); + } +} + +JobType job_type_collapse(JobType t, Unit *u) { + UnitActiveState s; + + switch (t) { + + case JOB_TRY_RESTART: + s = unit_active_state(u); + if (!UNIT_IS_ACTIVE_OR_RELOADING(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; + void *v; + + 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; + + HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_AFTER]) + if (other->job && job_compare(j, other->job, UNIT_AFTER) > 0) { + log_unit_debug(j->unit, + "starting held back, waiting for: %s", + other->id); + return false; + } + + HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_BEFORE]) + if (other->job && job_compare(j, other->job, UNIT_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; +} + +_pure_ static const char* job_get_begin_status_message_format(Unit *u, JobType t) { + const char *format; + + assert(u); + + if (t == JOB_RELOAD) + return "Reloading %s."; + + assert(IN_SET(t, JOB_START, JOB_STOP)); + + format = UNIT_VTABLE(u)->status_message_formats.starting_stopping[t == JOB_STOP]; + if (format) + return format; + + /* Return generic strings */ + if (t == JOB_START) + return "Starting %s."; + else { + assert(t == JOB_STOP); + return "Stopping %s."; + } +} + +static void job_print_begin_status_message(Unit *u, JobType t) { + const char *format; + + assert(u); + + /* Reload status messages have traditionally not been printed to console. */ + if (!IN_SET(t, JOB_START, JOB_STOP)) + return; + + format = job_get_begin_status_message_format(u, t); + + DISABLE_WARNING_FORMAT_NONLITERAL; + unit_status_printf(u, STATUS_TYPE_NORMAL, "", format); + REENABLE_WARNING; +} + +static void job_log_begin_status_message(Unit *u, uint32_t job_id, JobType t) { + const char *format, *mid; + char buf[LINE_MAX]; + + assert(u); + assert(t >= 0); + assert(t < _JOB_TYPE_MAX); + + if (!IN_SET(t, JOB_START, JOB_STOP, JOB_RELOAD)) + return; + + if (log_on_console()) /* Skip this if it would only go on the console anyway */ + return; + + /* We log status messages for all units and all operations. */ + + format = job_get_begin_status_message_format(u, t); + + DISABLE_WARNING_FORMAT_NONLITERAL; + (void) snprintf(buf, sizeof buf, format, unit_status_string(u)); + REENABLE_WARNING; + + 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; + + /* 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 the highest level, friendliest output + * possible, which means we should avoid the low-level unit + * name. */ + log_struct(LOG_INFO, + LOG_MESSAGE("%s", buf), + "JOB_ID=%" PRIu32, job_id, + "JOB_TYPE=%s", job_type_to_string(t), + LOG_UNIT_ID(u), + LOG_UNIT_INVOCATION_ID(u), + mid); +} + +static void job_emit_begin_status_message(Unit *u, uint32_t job_id, JobType t) { + assert(u); + assert(t >= 0); + assert(t < _JOB_TYPE_MAX); + + job_log_begin_status_message(u, job_id, t); + job_print_begin_status_message(u, t); +} + +static int job_perform_on_unit(Job **j) { + uint32_t id; + Manager *m; + JobType t; + Unit *u; + 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; + + switch (t) { + case JOB_START: + r = unit_start(u); + break; + + case JOB_RESTART: + t = JOB_STOP; + _fallthrough_; + case JOB_STOP: + r = unit_stop(u); + break; + + case JOB_RELOAD: + r = unit_reload(u); + break; + + default: + assert_not_reached("Invalid job type"); + } + + /* Log if the job still exists and the start/stop/reload function actually did something. Note that this means + * 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) + job_emit_begin_status_message(u, id, t); + + return 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: + r = job_perform_on_unit(&j); + + /* If the unit type does not support starting/stopping, then simply wait. */ + if (r == -EBADR) + r = 0; + break; + + case JOB_RELOAD: + r = job_perform_on_unit(&j); + break; + + case JOB_NOP: + r = -EALREADY; + break; + + default: + assert_not_reached("Unknown job type"); + } + + 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) /* condition failed, but all is good */ + 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 < 0) + r = job_finish_and_invalidate(j, JOB_FAILED, true, false); + } + + return r; +} + +_pure_ static const char *job_get_done_status_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 not supported.", + [JOB_COLLECTED] = "Unnecessary job for %s was removed.", + [JOB_ONCE] = "Unit %s has been started before and cannot be started again." + }; + static const char *const generic_finished_stop_job[_JOB_RESULT_MAX] = { + [JOB_DONE] = "Stopped %s.", + [JOB_FAILED] = "Stopped (with error) %s.", + [JOB_TIMEOUT] = "Timed out stopping %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.", + }; + /* 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 not active.", + }; + + const char *format; + + assert(u); + assert(t >= 0); + assert(t < _JOB_TYPE_MAX); + + 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[result] : + formats->finished_stop_job[result]; + if (format) + return format; + } + + /* Return generic strings */ + if (t == JOB_START) + return generic_finished_start_job[result]; + else if (IN_SET(t, JOB_STOP, JOB_RESTART)) + return generic_finished_stop_job[result]; + else if (t == JOB_RELOAD) + return generic_finished_reload_job[result]; + else if (t == JOB_VERIFY_ACTIVE) + return generic_finished_verify_active_job[result]; + + return NULL; +} + +static const struct { + const char *color, *word; +} job_print_done_status_messages[_JOB_RESULT_MAX] = { + [JOB_DONE] = { ANSI_OK_COLOR, " OK " }, + [JOB_TIMEOUT] = { ANSI_HIGHLIGHT_RED, " TIME " }, + [JOB_FAILED] = { ANSI_HIGHLIGHT_RED, "FAILED" }, + [JOB_DEPENDENCY] = { ANSI_HIGHLIGHT_YELLOW, "DEPEND" }, + [JOB_SKIPPED] = { ANSI_HIGHLIGHT, " INFO " }, + [JOB_ASSERT] = { ANSI_HIGHLIGHT_YELLOW, "ASSERT" }, + [JOB_UNSUPPORTED] = { ANSI_HIGHLIGHT_YELLOW, "UNSUPP" }, + /* JOB_COLLECTED */ + [JOB_ONCE] = { ANSI_HIGHLIGHT_RED, " ONCE " }, +}; + +static void job_print_done_status_message(Unit *u, JobType t, JobResult result) { + const char *format; + const char *status; + + assert(u); + assert(t >= 0); + assert(t < _JOB_TYPE_MAX); + + /* Reload status messages have traditionally not been printed to console. */ + if (t == JOB_RELOAD) + return; + + /* No message if the job did not actually do anything due to failed condition. */ + if (t == JOB_START && result == JOB_DONE && !u->condition_result) + return; + + if (!job_print_done_status_messages[result].word) + return; + + format = job_get_done_status_message_format(u, t, result); + if (!format) + return; + + if (log_get_show_color()) + status = strjoina(job_print_done_status_messages[result].color, + job_print_done_status_messages[result].word, + ANSI_NORMAL); + else + status = job_print_done_status_messages[result].word; + + DISABLE_WARNING_FORMAT_NONLITERAL; + unit_status_printf(u, + result == JOB_DONE ? STATUS_TYPE_NORMAL : STATUS_TYPE_NOTICE, + status, format); + REENABLE_WARNING; + + if (t == JOB_START && result == JOB_FAILED) { + _cleanup_free_ char *quoted; + + quoted = shell_maybe_quote(u->id, ESCAPE_BACKSLASH); + manager_status_printf(u->manager, STATUS_TYPE_NORMAL, NULL, "See 'systemctl status %s' for details.", strna(quoted)); + } +} + +static void job_log_done_status_message(Unit *u, uint32_t job_id, JobType t, JobResult result) { + const char *format, *mid; + char buf[LINE_MAX]; + static const int job_result_log_level[_JOB_RESULT_MAX] = { + [JOB_DONE] = LOG_INFO, + [JOB_CANCELED] = LOG_INFO, + [JOB_TIMEOUT] = LOG_ERR, + [JOB_FAILED] = LOG_ERR, + [JOB_DEPENDENCY] = LOG_WARNING, + [JOB_SKIPPED] = LOG_NOTICE, + [JOB_INVALID] = LOG_INFO, + [JOB_ASSERT] = LOG_WARNING, + [JOB_UNSUPPORTED] = LOG_WARNING, + [JOB_COLLECTED] = LOG_INFO, + [JOB_ONCE] = LOG_ERR, + }; + + assert(u); + assert(t >= 0); + assert(t < _JOB_TYPE_MAX); + + /* Skip printing if output goes to the console, and job_print_status_message() + will actually print something to the console. */ + if (log_on_console() && job_print_done_status_messages[result].word) + return; + + /* Show condition check message if the job did not actually do anything due to failed condition. */ + if ((t == JOB_START && result == JOB_DONE && !u->condition_result) || + (t == JOB_START && result == JOB_SKIPPED)) { + log_struct(LOG_INFO, + "MESSAGE=Condition check resulted in %s being skipped.", unit_status_string(u), + "JOB_ID=%" PRIu32, job_id, + "JOB_TYPE=%s", job_type_to_string(t), + "JOB_RESULT=%s", job_result_to_string(result), + LOG_UNIT_ID(u), + LOG_UNIT_INVOCATION_ID(u), + "MESSAGE_ID=" SD_MESSAGE_UNIT_STARTED_STR); + + return; + } + + format = job_get_done_status_message_format(u, t, result); + if (!format) + return; + + /* The description might be longer than the buffer, but that's OK, + * we'll just truncate it here. Note that we use snprintf() rather than + * xsprintf() on purpose here: we are fine with truncation and don't + * consider that an error. */ + DISABLE_WARNING_FORMAT_NONLITERAL; + (void) snprintf(buf, sizeof(buf), format, unit_status_string(u)); + REENABLE_WARNING; + + switch (t) { + + case JOB_START: + if (result == JOB_DONE) + mid = "MESSAGE_ID=" SD_MESSAGE_UNIT_STARTED_STR; + else + mid = "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILED_STR; + break; + + case JOB_RELOAD: + mid = "MESSAGE_ID=" SD_MESSAGE_UNIT_RELOADED_STR; + break; + + case JOB_STOP: + case JOB_RESTART: + mid = "MESSAGE_ID=" SD_MESSAGE_UNIT_STOPPED_STR; + break; + + default: + log_struct(job_result_log_level[result], + LOG_MESSAGE("%s", buf), + "JOB_ID=%" PRIu32, job_id, + "JOB_TYPE=%s", job_type_to_string(t), + "JOB_RESULT=%s", job_result_to_string(result), + LOG_UNIT_ID(u), + LOG_UNIT_INVOCATION_ID(u)); + return; + } + + log_struct(job_result_log_level[result], + LOG_MESSAGE("%s", buf), + "JOB_ID=%" PRIu32, job_id, + "JOB_TYPE=%s", job_type_to_string(t), + "JOB_RESULT=%s", job_result_to_string(result), + LOG_UNIT_ID(u), + LOG_UNIT_INVOCATION_ID(u), + mid); +} + +static void job_emit_done_status_message(Unit *u, uint32_t job_id, JobType t, JobResult result) { + assert(u); + + job_log_done_status_message(u, job_id, t, result); + job_print_done_status_message(u, t, result); +} + +static void job_fail_dependencies(Unit *u, UnitDependency d) { + Unit *other; + void *v; + + assert(u); + + HASHMAP_FOREACH_KEY(v, other, u->dependencies[d]) { + 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; + Unit *other; + JobType t; + void *v; + + 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_status_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)) + 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_REQUIRED_BY); + job_fail_dependencies(u, UNIT_REQUISITE_OF); + job_fail_dependencies(u, UNIT_BOUND_BY); + } else if (t == JOB_STOP) + job_fail_dependencies(u, UNIT_CONFLICTED_BY); + } + + /* 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 it's 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 && !UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) { + if (IN_SET(t, JOB_START, JOB_RELOAD)) + job_fail_dependencies(u, UNIT_REQUISITE_OF); + } + /* 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_struct(LOG_NOTICE, + "JOB_TYPE=%s", job_type_to_string(t), + "JOB_RESULT=%s", job_result_to_string(result), + LOG_UNIT_ID(u), + 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); + } + + unit_trigger_notify(u); + +finish: + /* Try to start the next jobs that can be started */ + HASHMAP_FOREACH_KEY(v, other, u->dependencies[UNIT_AFTER]) + if (other->job) { + job_add_to_run_queue(other->job); + job_add_to_gc_queue(other->job); + } + HASHMAP_FOREACH_KEY(v, other, u->dependencies[UNIT_BEFORE]) + if (other->job) { + job_add_to_run_queue(other->job); + job_add_to_gc_queue(other->job); + } + + manager_check_finished(u->manager); + + return 0; +} + +static int job_dispatch_timer(sd_event_source *s, uint64_t monotonic, void *userdata) { + Job *j = userdata; + Unit *u; + + assert(j); + 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; + + if (prioq_isempty(j->manager->run_queue)) { + r = sd_event_source_set_enabled(j->manager->run_queue_event_source, SD_EVENT_ONESHOT); + if (r < 0) + log_warning_errno(r, "Failed to enable job run queue event source, ignoring: %m"); + } + + 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; +} + +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"); + + /* End marker */ + fputc('\n', f); + return 0; +} + +int job_deserialize(Job *j, FILE *f) { + int r; + + assert(j); + assert(f); + + for (;;) { + _cleanup_free_ char *line = NULL; + char *l, *v; + size_t k; + + r = read_line(f, LONG_LINE_MAX, &line); + if (r < 0) + return log_error_errno(r, "Failed to read serialization line: %m"); + if (r == 0) + return 0; + + l = strstrip(line); + + /* End marker */ + if (isempty(l)) + return 0; + + 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 + log_debug("Unknown job serialization key: %s", l); + } +} + +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_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; + + if (detect_container() > 0) + return; + + (void) asynchronous_sync(NULL); +} + +int job_get_timeout(Job *j, usec_t *timeout) { + usec_t x = USEC_INFINITY, y = USEC_INFINITY; + Unit *u = j->unit; + int r; + + assert(u); + + 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) + return 0; + + *timeout = MIN(x, y); + return 1; +} + +bool job_may_gc(Job *j) { + Unit *other; + void *v; + + 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; + + 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. */ + HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_BEFORE]) + if (other->job && job_compare(j, other->job, UNIT_BEFORE) < 0) + return false; + + HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_AFTER]) + if (other->job && job_compare(j, other->job, UNIT_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; + size_t n = 0, n_allocated = 0; + Unit *other = NULL; + void *v; + + /* 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; + } + + HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_AFTER]) { + if (!other->job) + continue; + if (job_compare(j, other->job, UNIT_AFTER) <= 0) + continue; + + if (!GREEDY_REALLOC(list, n_allocated, n+1)) + return -ENOMEM; + list[n++] = other->job; + } + + HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_BEFORE]) { + if (!other->job) + continue; + if (job_compare(j, other->job, UNIT_BEFORE) <= 0) + continue; + + if (!GREEDY_REALLOC(list, n_allocated, 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; + size_t n = 0, n_allocated = 0; + Unit *other = NULL; + void *v; + + assert(j); + assert(ret); + + /* Returns a list of all pending jobs that are waiting for this job to finish. */ + + HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_BEFORE]) { + if (!other->job) + continue; + + if (other->job->ignore_order) + continue; + + if (job_compare(j, other->job, UNIT_BEFORE) >= 0) + continue; + + if (!GREEDY_REALLOC(list, n_allocated, n+1)) + return -ENOMEM; + list[n++] = other->job; + } + + HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_AFTER]) { + if (!other->job) + continue; + + if (other->job->ignore_order) + continue; + + if (job_compare(j, other->job, UNIT_AFTER) >= 0) + continue; + + if (!GREEDY_REALLOC(list, n_allocated, 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", +}; + +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", +}; + +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, UnitDependency assume_dep) { + assert(a->type < _JOB_TYPE_MAX_IN_TRANSACTION); + assert(b->type < _JOB_TYPE_MAX_IN_TRANSACTION); + assert(IN_SET(assume_dep, UNIT_AFTER, UNIT_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_AFTER) + return -job_compare(b, a, UNIT_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; +} |