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core: introduce seperate reverse dependencies for Requires= and Requisite=

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This allows us to ensure that Requisite= dependencies never cause
propagation between units, while Requires= dependencies might.

http://lists.freedesktop.org/archives/systemd-devel/2015-May/031742.html
This commit is contained in:
Lennart Poettering 2015-05-19 01:24:28 +02:00
parent 9530e0d023
commit be7d9ff730
5 changed files with 63 additions and 55 deletions
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2
src/core/dbus-unit.c
View File

@ -561,6 +561,8 @@ const sd_bus_vtable bus_unit_vtable[] = {
SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY_OVERRIDABLE]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RequisiteOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RequisiteOfOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OF_OVERRIDABLE]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), SD_BUS_VTABLE_PROPERTY_CONST),

57
src/core/job.c
View File

@ -790,6 +790,24 @@ static void job_log_status_message(Unit *u, JobType t, JobResult result) {
NULL);
}
static void job_fail_dependencies(Unit *u, UnitDependency d) {
Unit *other;
Iterator i;
assert(u);
SET_FOREACH(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);
}
}
int job_finish_and_invalidate(Job *j, JobResult result, bool recursive) {
Unit *u;
Unit *other;
@ -831,37 +849,14 @@ int job_finish_and_invalidate(Job *j, JobResult result, bool recursive) {
/* Fail depending jobs on failure */
if (result != JOB_DONE && recursive) {
if (t == JOB_START ||
t == JOB_VERIFY_ACTIVE) {
SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
if (other->job &&
(other->job->type == JOB_START ||
other->job->type == JOB_VERIFY_ACTIVE))
job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
if (other->job &&
(other->job->type == JOB_START ||
other->job->type == JOB_VERIFY_ACTIVE))
job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
if (other->job &&
!other->job->override &&
(other->job->type == JOB_START ||
other->job->type == JOB_VERIFY_ACTIVE))
job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
} else if (t == JOB_STOP) {
SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
if (other->job &&
(other->job->type == JOB_START ||
other->job->type == JOB_VERIFY_ACTIVE))
job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
}
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);
job_fail_dependencies(u, UNIT_REQUIRED_BY_OVERRIDABLE);
job_fail_dependencies(u, UNIT_REQUISITE_OF_OVERRIDABLE);
} else if (t == JOB_STOP)
job_fail_dependencies(u, UNIT_CONFLICTED_BY);
}
/* Trigger OnFailure dependencies that are not generated by

51
src/core/unit.c
View File

@ -1092,6 +1092,8 @@ static int unit_add_target_dependencies(Unit *u) {
static const UnitDependency deps[] = {
UNIT_REQUIRED_BY,
UNIT_REQUIRED_BY_OVERRIDABLE,
UNIT_REQUISITE_OF,
UNIT_REQUISITE_OF_OVERRIDABLE,
UNIT_WANTED_BY,
UNIT_BOUND_BY
};
@ -1589,8 +1591,20 @@ bool unit_can_reload(Unit *u) {
}
static void unit_check_unneeded(Unit *u) {
Iterator i;
static const UnitDependency needed_dependencies[] = {
UNIT_REQUIRED_BY,
UNIT_REQUIRED_BY_OVERRIDABLE,
UNIT_REQUISITE,
UNIT_REQUISITE_OF_OVERRIDABLE,
UNIT_WANTED_BY,
UNIT_BOUND_BY,
};
Unit *other;
Iterator i;
unsigned j;
int r;
assert(u);
@ -1603,26 +1617,17 @@ static void unit_check_unneeded(Unit *u) {
if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
return;
SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
if (unit_active_or_pending(other))
return;
SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
if (unit_active_or_pending(other))
return;
SET_FOREACH(other, u->dependencies[UNIT_WANTED_BY], i)
if (unit_active_or_pending(other))
return;
SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
if (unit_active_or_pending(other))
return;
for (j = 0; j < ELEMENTSOF(needed_dependencies); j++)
SET_FOREACH(other, u->dependencies[j], i)
if (unit_active_or_pending(other))
return;
log_unit_info(u, "Unit not needed anymore. Stopping.");
/* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
r = manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
if (r < 0)
log_unit_warning_errno(u, r, "Failed to enqueue stop job, ignoring: %m");
}
static void unit_check_binds_to(Unit *u) {
@ -2163,13 +2168,15 @@ int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_referen
[UNIT_REQUIRES] = UNIT_REQUIRED_BY,
[UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
[UNIT_WANTS] = UNIT_WANTED_BY,
[UNIT_REQUISITE] = UNIT_REQUIRED_BY,
[UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
[UNIT_REQUISITE] = UNIT_REQUISITE_OF,
[UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUISITE_OF_OVERRIDABLE,
[UNIT_BINDS_TO] = UNIT_BOUND_BY,
[UNIT_PART_OF] = UNIT_CONSISTS_OF,
[UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
[UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
[UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
[UNIT_REQUIRED_BY] = UNIT_REQUIRES,
[UNIT_REQUIRED_BY_OVERRIDABLE] = UNIT_REQUIRES_OVERRIDABLE,
[UNIT_REQUISITE_OF] = UNIT_REQUISITE,
[UNIT_REQUISITE_OF_OVERRIDABLE] = UNIT_REQUISITE_OVERRIDABLE,
[UNIT_WANTED_BY] = UNIT_WANTS,
[UNIT_BOUND_BY] = UNIT_BINDS_TO,
[UNIT_CONSISTS_OF] = UNIT_PART_OF,
[UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,

2
src/shared/unit-name.c
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@ -812,6 +812,8 @@ static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
[UNIT_PART_OF] = "PartOf",
[UNIT_REQUIRED_BY] = "RequiredBy",
[UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
[UNIT_REQUISITE_OF] = "RequisiteOf",
[UNIT_REQUISITE_OF_OVERRIDABLE] = "RequisiteOfOverridable",
[UNIT_WANTED_BY] = "WantedBy",
[UNIT_BOUND_BY] = "BoundBy",
[UNIT_CONSISTS_OF] = "ConsistsOf",

6
src/shared/unit-name.h
View File

@ -71,8 +71,10 @@ enum UnitDependency {
UNIT_PART_OF,
/* Inverse of the above */
UNIT_REQUIRED_BY, /* inverse of 'requires' and 'requisite' is 'required_by' */
UNIT_REQUIRED_BY_OVERRIDABLE, /* inverse of 'requires_overridable' and 'requisite_overridable' is 'soft_required_by' */
UNIT_REQUIRED_BY, /* inverse of 'requires' is 'required_by' */
UNIT_REQUIRED_BY_OVERRIDABLE, /* inverse of 'requires_overridable' is 'required_by_overridable' */
UNIT_REQUISITE_OF, /* inverse of 'requisite' is 'requisite_of' */
UNIT_REQUISITE_OF_OVERRIDABLE,/* inverse of 'requisite_overridable' is 'requisite_of_overridable' */
UNIT_WANTED_BY, /* inverse of 'wants' */
UNIT_BOUND_BY, /* inverse of 'binds_to' */
UNIT_CONSISTS_OF, /* inverse of 'part_of' */