+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
#include "transaction.h"
#include "bus-errors.h"
}
static void transaction_drop_redundant(Transaction *tr) {
- bool again;
-
- assert(tr);
-
- /* Goes through the transaction and removes all jobs that are
- * a noop */
-
- do {
- Job *j;
- Iterator i;
-
- again = false;
-
- HASHMAP_FOREACH(j, tr->jobs, i) {
- bool changes_something = false;
- Job *k;
+ Job *j;
+ Iterator i;
- LIST_FOREACH(transaction, k, j) {
+ /* Goes through the transaction and removes all jobs of the units
+ * whose jobs are all noops. If not all of a unit's jobs are
+ * redundant, they are kept. */
- if (tr->anchor_job != k &&
- job_type_is_redundant(k->type, unit_active_state(k->unit)) &&
- (!k->unit->job || !job_type_is_conflicting(k->type, k->unit->job->type)))
- continue;
+ assert(tr);
- changes_something = true;
- break;
- }
+rescan:
+ HASHMAP_FOREACH(j, tr->jobs, i) {
+ Job *k;
- if (changes_something)
- continue;
+ LIST_FOREACH(transaction, k, j) {
- /* log_debug("Found redundant job %s/%s, dropping.", j->unit->id, job_type_to_string(j->type)); */
- transaction_delete_job(tr, j, false);
- again = true;
- break;
+ if (tr->anchor_job == k ||
+ !job_type_is_redundant(k->type, unit_active_state(k->unit)) ||
+ (k->unit->job && job_type_is_conflicting(k->type, k->unit->job->type)))
+ goto next_unit;
}
- } while (again);
+ /* log_debug("Found redundant job %s/%s, dropping.", j->unit->id, job_type_to_string(j->type)); */
+ transaction_delete_job(tr, j, false);
+ goto rescan;
+ next_unit:;
+ }
}
static bool unit_matters_to_anchor(Unit *u, Job *j) {
}
static void transaction_collect_garbage(Transaction *tr) {
- bool again;
+ Iterator i;
+ Job *j;
assert(tr);
/* Drop jobs that are not required by any other job */
- do {
- Iterator i;
- Job *j;
-
- again = false;
-
- HASHMAP_FOREACH(j, tr->jobs, i) {
- if (tr->anchor_job == j || j->object_list) {
- /* log_debug("Keeping job %s/%s because of %s/%s", */
- /* j->unit->id, job_type_to_string(j->type), */
- /* j->object_list->subject ? j->object_list->subject->unit->id : "root", */
- /* j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
- continue;
- }
-
- /* log_debug("Garbage collecting job %s/%s", j->unit->id, job_type_to_string(j->type)); */
- transaction_delete_job(tr, j, true);
- again = true;
- break;
+rescan:
+ HASHMAP_FOREACH(j, tr->jobs, i) {
+ if (tr->anchor_job == j || j->object_list) {
+ /* log_debug("Keeping job %s/%s because of %s/%s", */
+ /* j->unit->id, job_type_to_string(j->type), */
+ /* j->object_list->subject ? j->object_list->subject->unit->id : "root", */
+ /* j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
+ continue;
}
- } while (again);
+ /* log_debug("Garbage collecting job %s/%s", j->unit->id, job_type_to_string(j->type)); */
+ transaction_delete_job(tr, j, true);
+ goto rescan;
+ }
}
static int transaction_is_destructive(Transaction *tr, DBusError *e) {
}
static void transaction_minimize_impact(Transaction *tr) {
- bool again;
+ Job *j;
+ Iterator i;
+
assert(tr);
/* Drops all unnecessary jobs that reverse already active jobs
* or that stop a running service. */
- do {
- Job *j;
- Iterator i;
-
- again = false;
-
- HASHMAP_FOREACH(j, tr->jobs, i) {
- LIST_FOREACH(transaction, j, j) {
- bool stops_running_service, changes_existing_job;
-
- /* If it matters, we shouldn't drop it */
- if (j->matters_to_anchor)
- continue;
+rescan:
+ HASHMAP_FOREACH(j, tr->jobs, i) {
+ LIST_FOREACH(transaction, j, j) {
+ bool stops_running_service, changes_existing_job;
- /* Would this stop a running service?
- * Would this change an existing job?
- * If so, let's drop this entry */
+ /* If it matters, we shouldn't drop it */
+ if (j->matters_to_anchor)
+ continue;
- stops_running_service =
- j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
+ /* Would this stop a running service?
+ * Would this change an existing job?
+ * If so, let's drop this entry */
- changes_existing_job =
- j->unit->job &&
- job_type_is_conflicting(j->type, j->unit->job->type);
+ stops_running_service =
+ j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
- if (!stops_running_service && !changes_existing_job)
- continue;
+ changes_existing_job =
+ j->unit->job &&
+ job_type_is_conflicting(j->type, j->unit->job->type);
- if (stops_running_service)
- log_debug("%s/%s would stop a running service.", j->unit->id, job_type_to_string(j->type));
+ if (!stops_running_service && !changes_existing_job)
+ continue;
- if (changes_existing_job)
- log_debug("%s/%s would change existing job.", j->unit->id, job_type_to_string(j->type));
+ if (stops_running_service)
+ log_debug("%s/%s would stop a running service.", j->unit->id, job_type_to_string(j->type));
- /* Ok, let's get rid of this */
- log_debug("Deleting %s/%s to minimize impact.", j->unit->id, job_type_to_string(j->type));
+ if (changes_existing_job)
+ log_debug("%s/%s would change existing job.", j->unit->id, job_type_to_string(j->type));
- transaction_delete_job(tr, j, true);
- again = true;
- break;
- }
+ /* Ok, let's get rid of this */
+ log_debug("Deleting %s/%s to minimize impact.", j->unit->id, job_type_to_string(j->type));
- if (again)
- break;
+ transaction_delete_job(tr, j, true);
+ goto rescan;
}
-
- } while (again);
+ }
}
static int transaction_apply(Transaction *tr, Manager *m, JobMode mode) {
}
int transaction_activate(Transaction *tr, Manager *m, JobMode mode, DBusError *e) {
+ Iterator i;
+ Job *j;
int r;
unsigned generation = 1;
/* This applies the changes recorded in tr->jobs to
* the actual list of jobs, if possible. */
+ /* Reset the generation counter of all installed jobs. The detection of cycles
+ * looks at installed jobs. If they had a non-zero generation from some previous
+ * walk of the graph, the algorithm would break. */
+ HASHMAP_FOREACH(j, m->jobs, i)
+ j->generation = 0;
+
/* First step: figure out which jobs matter */
transaction_find_jobs_that_matter_to_anchor(tr->anchor_job, generation++);
if (type != JOB_STOP && unit->load_state == UNIT_MASKED) {
dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->id);
- return -EINVAL;
+ return -EADDRNOTAVAIL;
}
if (!unit_job_is_applicable(unit, type)) {
}
/* Finally, recursively add in all dependencies. */
- if (type == JOB_START || type == JOB_RELOAD_OR_START) {
+ if (type == JOB_START || type == JOB_RELOAD_OR_START || type == JOB_RESTART) {
SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUIRES], i) {
r = transaction_add_job_and_dependencies(tr, JOB_START, dep, ret, true, override, false, false, ignore_order, e);
if (r < 0) {
SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUIRES_OVERRIDABLE], i) {
r = transaction_add_job_and_dependencies(tr, JOB_START, dep, ret, !override, override, false, false, ignore_order, e);
if (r < 0) {
- log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
+ log_full(r == -EADDRNOTAVAIL ? LOG_DEBUG : LOG_WARNING,
+ "Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
if (e)
dbus_error_free(e);
SET_FOREACH(dep, ret->unit->dependencies[UNIT_WANTS], i) {
r = transaction_add_job_and_dependencies(tr, JOB_START, dep, ret, false, false, false, false, ignore_order, e);
if (r < 0) {
- log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
+ log_full(r == -EADDRNOTAVAIL ? LOG_DEBUG : LOG_WARNING,
+ "Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
if (e)
dbus_error_free(e);
SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUISITE_OVERRIDABLE], i) {
r = transaction_add_job_and_dependencies(tr, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e);
if (r < 0) {
- log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
+ log_full(r == -EADDRNOTAVAIL ? LOG_DEBUG : LOG_WARNING,
+ "Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
if (e)
dbus_error_free(e);
~ianmdlvl / elogind.git / blobdiff