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-rw-r--r--src/core/job.c1668
1 files changed, 1668 insertions, 0 deletions
diff --git a/src/core/job.c b/src/core/job.c
new file mode 100644
index 0000000..59bb9d2
--- /dev/null
+++ b/src/core/job.c
@@ -0,0 +1,1668 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+
+#include "sd-id128.h"
+#include "sd-messages.h"
+
+#include "alloc-util.h"
+#include "async.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 "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) {
+ LIST_REMOVE(run_queue, j->manager->run_queue, j);
+ 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_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_INACTIVE_OR_DEACTIVATING(s))
+ return JOB_NOP;
+
+ return JOB_RESTART;
+
+ case JOB_TRY_RELOAD:
+ s = unit_active_state(u);
+ if (UNIT_IS_INACTIVE_OR_DEACTIVATING(s))
+ return JOB_NOP;
+
+ return JOB_RELOAD;
+
+ case JOB_RELOAD_OR_START:
+ s = unit_active_state(u);
+ if (UNIT_IS_INACTIVE_OR_DEACTIVATING(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) {
+ Iterator i;
+ 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;
+
+ if (IN_SET(j->type, JOB_START, JOB_VERIFY_ACTIVE, JOB_RELOAD)) {
+ /* Immediate result is that the job is or might be
+ * started. In this case let's wait for the
+ * dependencies, regardless whether they are
+ * starting or stopping something. */
+
+ HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_AFTER], i)
+ if (other->job)
+ return false;
+ }
+
+ /* Also, if something else is being stopped and we should
+ * change state after it, then let's wait. */
+
+ HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_BEFORE], i)
+ if (other->job &&
+ IN_SET(other->job->type, JOB_STOP, JOB_RESTART))
+ return false;
+
+ /* This means that for a service a and a service b where b
+ * shall be started after a:
+ *
+ * start a + start b → 1st step start a, 2nd step start b
+ * start a + stop b → 1st step stop b, 2nd step start a
+ * stop a + start b → 1st step stop a, 2nd step start b
+ * stop a + stop b → 1st step stop b, 2nd step stop a
+ *
+ * This has the side effect that restarts are properly
+ * synchronized too. */
+
+ return true;
+}
+
+static void job_change_type(Job *j, JobType newtype) {
+ 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, "", 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_description(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);
+
+ LIST_REMOVE(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;
+
+ 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)) {
+ format = t == JOB_START ?
+ UNIT_VTABLE(u)->status_message_formats.finished_start_job[result] :
+ UNIT_VTABLE(u)->status_message_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;
+
+ if (result != JOB_DONE)
+ manager_flip_auto_status(u->manager, true);
+
+ DISABLE_WARNING_FORMAT_NONLITERAL;
+ unit_status_printf(u, 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) {
+ log_struct(LOG_INFO,
+ "MESSAGE=Condition check resulted in %s being skipped.", unit_description(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_description(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;
+ Iterator i;
+ void *v;
+
+ assert(u);
+
+ HASHMAP_FOREACH_KEY(v, other, u->dependencies[d], i) {
+ 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;
+ Iterator i;
+ 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 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);
+ }
+
+ /* 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], i)
+ 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], i)
+ 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 (!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");
+ }
+
+ LIST_PREPEND(run_queue, j->manager->run_queue, j);
+ j->in_run_queue = true;
+}
+
+void job_add_to_dbus_queue(Job *j) {
+ assert(j);
+ assert(j->installed);
+
+ if (j->in_dbus_queue)
+ return;
+
+ /* We don't check if anybody is subscribed here, since this
+ * job might just have been created and not yet assigned to a
+ * connection/client. */
+
+ LIST_PREPEND(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 (j->begin_running_usec > 0 && j->unit->job_running_timeout != USEC_INFINITY)
+ 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;
+ Iterator i;
+ 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;
+
+ /* If a job is ordered after ours, and is to be started, then it needs to wait for us, regardless if we stop or
+ * start, hence let's not GC in that case. */
+ HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_BEFORE], i) {
+ if (!other->job)
+ continue;
+
+ if (other->job->ignore_order)
+ continue;
+
+ if (IN_SET(other->job->type, JOB_START, JOB_VERIFY_ACTIVE, JOB_RELOAD))
+ return false;
+ }
+
+ /* If we are going down, but something else is ordered After= us, then it needs to wait for us */
+ if (IN_SET(j->type, JOB_STOP, JOB_RESTART))
+ HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_AFTER], i) {
+ if (!other->job)
+ continue;
+
+ if (other->job->ignore_order)
+ continue;
+
+ return false;
+ }
+
+ /* The logic above is kinda the inverse of the job_is_runnable() logic. Specifically, if the job "we" is
+ * ordered before the job "other":
+ *
+ * we start + other start → stay
+ * we start + other stop → gc
+ * we stop + other start → stay
+ * we stop + other stop → gc
+ *
+ * "we" are ordered after "other":
+ *
+ * we start + other start → gc
+ * we start + other stop → gc
+ * we stop + other start → stay
+ * we stop + other stop → stay
+ */
+
+ 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(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);
+
+ /* 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;
+ Iterator i;
+ 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;
+ }
+
+ if (IN_SET(j->type, JOB_START, JOB_VERIFY_ACTIVE, JOB_RELOAD)) {
+
+ HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_AFTER], i) {
+ if (!other->job)
+ 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], i) {
+ if (!other->job)
+ continue;
+
+ if (!IN_SET(other->job->type, JOB_STOP, JOB_RESTART))
+ 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;
+ Iterator i;
+
+ 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], i) {
+ if (!other->job)
+ continue;
+
+ if (other->job->ignore_order)
+ continue;
+
+ if (!IN_SET(other->job->type, JOB_START, JOB_VERIFY_ACTIVE, JOB_RELOAD))
+ continue;
+
+ if (!GREEDY_REALLOC(list, n_allocated, n+1))
+ return -ENOMEM;
+ list[n++] = other->job;
+ }
+
+ if (IN_SET(j->type, JOB_STOP, JOB_RESTART)) {
+
+ HASHMAP_FOREACH_KEY(v, other, j->unit->dependencies[UNIT_AFTER], i) {
+ if (!other->job)
+ continue;
+
+ if (other->job->ignore_order)
+ 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",
+};
+
+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";
+}