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manager: when two pending jobs conflict, keep the one that "conflicts", remove the one that is "conflicted"

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This gives the writer of units control which unit is kept and which is
stopped when two units conflict.
This commit is contained in:
Lennart Poettering
2010-08-09 22:32:30 +02:00
parent 6e98720f14
commit 69dd2852bb
17 changed files with 161 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/automount.c
+1 -1
View File
@@ -156,7 +156,7 @@ static int automount_add_default_dependencies(Automount *a) {
if ((r = unit_add_dependency_by_name(UNIT(a), UNIT_AFTER, SPECIAL_FSCK_TARGET, NULL, true)) < 0)
return r;
if ((r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
if ((r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
return r;
}
src/dbus-unit.h
+2
View File
@@ -70,6 +70,7 @@
" <property name=\"RequiredByOverridable\" type=\"as\" access=\"read\"/>\n" \
" <property name=\"WantedBy\" type=\"as\" access=\"read\"/>\n" \
" <property name=\"Conflicts\" type=\"as\" access=\"read\"/>\n" \
" <property name=\"ConflictedBy\" type=\"as\" access=\"read\"/>\n" \
" <property name=\"Before\" type=\"as\" access=\"read\"/>\n" \
" <property name=\"After\" type=\"as\" access=\"read\"/>\n" \
" <property name=\"OnFailure\" type=\"as\" access=\"read\"/>\n" \
@@ -108,6 +109,7 @@
{ "org.freedesktop.systemd1.Unit", "RequiredByOverridable",bus_unit_append_dependencies, "as", u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE] }, \
{ "org.freedesktop.systemd1.Unit", "WantedBy", bus_unit_append_dependencies, "as", u->meta.dependencies[UNIT_WANTED_BY] }, \
{ "org.freedesktop.systemd1.Unit", "Conflicts", bus_unit_append_dependencies, "as", u->meta.dependencies[UNIT_CONFLICTS] }, \
{ "org.freedesktop.systemd1.Unit", "ConflictedBy", bus_unit_append_dependencies, "as", u->meta.dependencies[UNIT_CONFLICTED_BY] }, \
{ "org.freedesktop.systemd1.Unit", "Before", bus_unit_append_dependencies, "as", u->meta.dependencies[UNIT_BEFORE] }, \
{ "org.freedesktop.systemd1.Unit", "After", bus_unit_append_dependencies, "as", u->meta.dependencies[UNIT_AFTER] }, \
{ "org.freedesktop.systemd1.Unit", "OnFailure", bus_unit_append_dependencies, "as", u->meta.dependencies[UNIT_ON_FAILURE] }, \
src/job.c
+10 -1
View File
@@ -93,7 +93,7 @@ void job_free(Job *j) {
free(j);
}
JobDependency* job_dependency_new(Job *subject, Job *object, bool matters) {
JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts) {
JobDependency *l;
assert(object);
@@ -109,6 +109,7 @@ JobDependency* job_dependency_new(Job *subject, Job *object, bool matters) {
l->subject = subject;
l->object = object;
l->matters = matters;
l->conflicts = conflicts;
if (subject)
LIST_PREPEND(JobDependency, subject, subject->subject_list, l);
@@ -533,6 +534,14 @@ int job_finish_and_invalidate(Job *j, bool success) {
other->meta.job->type == JOB_VERIFY_ACTIVE ||
other->meta.job->type == JOB_RELOAD_OR_START))
job_finish_and_invalidate(other->meta.job, false);
SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
if (!other->meta.ignore_dependency_failure &&
other->meta.job &&
(other->meta.job->type == JOB_START ||
other->meta.job->type == JOB_VERIFY_ACTIVE ||
other->meta.job->type == JOB_RELOAD_OR_START))
job_finish_and_invalidate(other->meta.job, false);
}
}
src/job.h
+2 -1
View File
@@ -80,6 +80,7 @@ struct JobDependency {
LIST_FIELDS(JobDependency, object);
bool matters;
bool conflicts;
};
struct Job {
@@ -121,7 +122,7 @@ Job* job_new(Manager *m, JobType type, Unit *unit);
void job_free(Job *job);
void job_dump(Job *j, FILE*f, const char *prefix);
JobDependency* job_dependency_new(Job *subject, Job *object, bool matters);
JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts);
void job_dependency_free(JobDependency *l);
void job_dependency_delete(Job *subject, Job *object, bool *matters);
src/manager.c
+59 -11
View File
@@ -715,6 +715,20 @@ static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, Job
other->object_list = NULL;
transaction_delete_job(m, other, true);
}
static bool job_is_conflicted_by(Job *j) {
JobDependency *l;
assert(j);
/* Returns true if this job is pulled in by a least one
* ConflictedBy dependency. */
LIST_FOREACH(object, l, j->object_list)
if (l->conflicts)
return true;
return false;
}
static int delete_one_unmergeable_job(Manager *m, Job *j) {
Job *k;
@@ -738,7 +752,36 @@ static int delete_one_unmergeable_job(Manager *m, Job *j) {
/* Ok, we found two that conflict, let's see if we can
* drop one of them */
if (!j->matters_to_anchor)
if (!j->matters_to_anchor && !k->matters_to_anchor) {
/* Both jobs don't matter, so let's
* find the one that is smarter to
* remove. Let's think positive and
* rather remove stops then starts --
* except if something is being
* stopped because it is conflicted by
* another unit in which case we
* rather remove the start. */
log_debug("Looking at job %s/%s conflicted_by=%s", j->unit->meta.id, job_type_to_string(j->type), yes_no(j->type == JOB_STOP && job_is_conflicted_by(j)));
log_debug("Looking at job %s/%s conflicted_by=%s", k->unit->meta.id, job_type_to_string(k->type), yes_no(k->type == JOB_STOP && job_is_conflicted_by(k)));
if (j->type == JOB_STOP) {
if (job_is_conflicted_by(j))
d = k;
else
d = j;
} else if (k->type == JOB_STOP) {
if (job_is_conflicted_by(k))
d = j;
else
d = k;
}
} else if (!j->matters_to_anchor)
d = j;
else if (!k->matters_to_anchor)
d = k;
@@ -1324,6 +1367,7 @@ static int transaction_add_job_and_dependencies(
Job *by,
bool matters,
bool override,
bool conflicts,
DBusError *e,
Job **_ret) {
Job *ret;
@@ -1352,46 +1396,50 @@ static int transaction_add_job_and_dependencies(
return -ENOMEM;
/* Then, add a link to the job. */
if (!job_dependency_new(by, ret, matters))
if (!job_dependency_new(by, ret, matters, conflicts))
return -ENOMEM;
if (is_new) {
/* Finally, recursively add in all dependencies. */
if (type == JOB_START || type == JOB_RELOAD_OR_START) {
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, e, NULL)) < 0 && r != -EBADR)
goto fail;
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, e, NULL)) < 0 && r != -EBADR) {
if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, e, NULL)) < 0 && r != -EBADR) {
log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
dbus_error_free(e);
}
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, e, NULL)) < 0) {
if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, e, NULL)) < 0) {
log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
dbus_error_free(e);
}
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, e, NULL)) < 0 && r != -EBADR)
goto fail;
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, e, NULL)) < 0 && r != -EBADR) {
if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, e, NULL)) < 0 && r != -EBADR) {
log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
dbus_error_free(e);
}
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, e, NULL)) < 0 && r != -EBADR)
goto fail;
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, false, e, NULL)) < 0 && r != -EBADR)
goto fail;
} else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, e, NULL)) < 0 && r != -EBADR)
goto fail;
}
@@ -1432,7 +1480,7 @@ static int transaction_add_isolate_jobs(Manager *m) {
if (hashmap_get(m->transaction_jobs, u))
continue;
if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL, NULL)) < 0)
if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, NULL, NULL)) < 0)
log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
}
@@ -1455,7 +1503,7 @@ int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool ove
log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, e, &ret)) < 0) {
if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false, e, &ret)) < 0) {
transaction_abort(m);
return r;
}
src/mount.c
+1 -1
View File
@@ -285,7 +285,7 @@ static int mount_add_default_dependencies(Mount *m) {
if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_FSCK_TARGET, NULL, true)) < 0)
return r;
if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
return r;
}
src/path.c
+1 -1
View File
@@ -110,7 +110,7 @@ static int path_add_default_dependencies(Path *p) {
if ((r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
return r;
return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_SHUTDOWN_TARGET, NULL, true);
}
static int path_load(Unit *u) {
src/service.c
+1 -1
View File
@@ -873,7 +873,7 @@ static int service_add_default_dependencies(Service *s) {
}
/* Second, activate normal shutdown */
return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_SHUTDOWN_TARGET, NULL, true);
}
static int service_load(Unit *u) {
src/socket.c
+1 -1
View File
@@ -296,7 +296,7 @@ static int socket_add_default_dependencies(Socket *s) {
if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
return r;
return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_SHUTDOWN_TARGET, NULL, true);
}
static int socket_load(Unit *u) {
src/systemctl.c
+1
View File
@@ -311,6 +311,7 @@ static int dot_one_property(const char *name, const char *prop, DBusMessageIter
"RequisiteOverridable", "[color=\"darkblue\"]",
"Wants", "[color=\"darkgrey\"]",
"Conflicts", "[color=\"red\"]",
"ConflictedBy", "[color=\"red\"]",
"After", "[color=\"green\"]"
};
src/timer.c
+1 -1
View File
@@ -82,7 +82,7 @@ static int timer_add_default_dependencies(Timer *t) {
if ((r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
return r;
return unit_add_two_dependencies_by_name(UNIT(t), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
return unit_add_two_dependencies_by_name(UNIT(t), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_SHUTDOWN_TARGET, NULL, true);
}
static int timer_load(Unit *u) {
src/unit.c
+7 -1
View File
@@ -934,6 +934,10 @@ static void retroactively_start_dependencies(Unit *u) {
SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
}
static void retroactively_stop_dependencies(Unit *u) {
@@ -1312,7 +1316,8 @@ int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_referen
[UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
[UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
[UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
[UNIT_CONFLICTS] = UNIT_CONFLICTS,
[UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
[UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
[UNIT_BEFORE] = UNIT_AFTER,
[UNIT_AFTER] = UNIT_BEFORE,
[UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
@@ -2138,6 +2143,7 @@ static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
[UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
[UNIT_WANTED_BY] = "WantedBy",
[UNIT_CONFLICTS] = "Conflicts",
[UNIT_CONFLICTED_BY] = "ConflictedBy",
[UNIT_BEFORE] = "Before",
[UNIT_AFTER] = "After",
[UNIT_REFERENCES] = "References",
src/unit.h
+2 -1
View File
@@ -108,7 +108,8 @@ enum UnitDependency {
UNIT_WANTED_BY, /* inverse of 'wants' */
/* Negative dependencies */
UNIT_CONFLICTS, /* inverse of 'conflicts' is 'conflicts' */
UNIT_CONFLICTS, /* inverse of 'conflicts' is 'conflicted_by' */
UNIT_CONFLICTED_BY,
/* Order */
UNIT_BEFORE, /* inverse of 'before' is 'after' and vice versa */