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implement recursive_stop/stop_when_unneeded unit flags

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This commit is contained in:
Lennart Poettering 2010-01-29 20:47:09 +01:00
parent 9eba9da4bc
commit f3bff0eb3b
3 changed files with 73 additions and 4 deletions
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2
load-fragment.c
View File

@ -821,6 +821,8 @@ static int load_from_path(Unit *u, const char *path) {
{ "Conflicts", config_parse_deps, UINT_TO_PTR(UNIT_CONFLICTS), "Meta" },
{ "Before", config_parse_deps, UINT_TO_PTR(UNIT_BEFORE), "Meta" },
{ "After", config_parse_deps, UINT_TO_PTR(UNIT_AFTER), "Meta" },
{ "RecursiveStop", config_parse_bool, &u->meta.recursive_stop, "Meta" },
{ "StopWhenUnneeded", config_parse_bool, &u->meta.stop_when_unneeded, "Meta" },
{ "PIDFile", config_parse_path, &u->service.pid_file, "Service" },
{ "ExecStartPre", config_parse_exec, u->service.exec_command+SERVICE_EXEC_START_PRE, "Service" },

69
unit.c
View File

@ -373,11 +373,15 @@ void unit_dump(Unit *u, FILE *f, const char *prefix) {
"%s→ Unit %s:\n"
"%s\tDescription: %s\n"
"%s\tUnit Load State: %s\n"
"%s\tUnit Active State: %s\n",
"%s\tUnit Active State: %s\n"
"%s\tRecursive Deactivate: %s\n"
"%s\tStop When Unneeded: %s\n",
prefix, unit_id(u),
prefix, unit_description(u),
prefix, load_state_table[u->meta.load_state],
prefix, active_state_table[unit_active_state(u)]);
prefix, active_state_table[unit_active_state(u)],
prefix, yes_no(u->meta.recursive_stop),
prefix, yes_no(u->meta.stop_when_unneeded));
if (u->meta.load_path)
fprintf(f, "%s\tLoad Path: %s\n", prefix, u->meta.load_path);
@ -538,6 +542,39 @@ bool unit_can_reload(Unit *u) {
return UNIT_VTABLE(u)->can_reload(u);
}
static void unit_check_uneeded(Unit *u) {
Iterator i;
Unit *other;
assert(u);
/* If this service shall be shut down when unneeded then do
* so. */
if (!u->meta.stop_when_unneeded)
return;
if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
return;
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
return;
SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
return;
SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
return;
log_debug("Service %s is not needed anymore. Stopping.", unit_id(u));
/* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
}
static void retroactively_start_dependencies(Unit *u) {
Iterator i;
Unit *other;
@ -573,9 +610,29 @@ static void retroactively_stop_dependencies(Unit *u) {
assert(u);
assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
if (u->meta.recursive_stop) {
/* Pull down units need us recursively if enabled */
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
}
/* Garbage collect services that might not be needed anymore, if enabled */
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
unit_check_uneeded(other);
SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_uneeded(other);
SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_uneeded(other);
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_uneeded(other);
SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUISITE], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_uneeded(other);
}
void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
@ -665,6 +722,10 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
retroactively_start_dependencies(u);
else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
retroactively_stop_dependencies(u);
/* Maybe we finished startup and are now ready for being
* stopped because unneeded? */
unit_check_uneeded(u);
}
int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {

6
unit.h
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@ -111,6 +111,12 @@ struct Meta {
bool in_load_queue:1;
/* If we go down, pull down everything that depends on us, too */
bool recursive_stop;
/* Garbage collect us we nobody wants or requires us anymore */
bool stop_when_unneeded;
usec_t active_enter_timestamp;
usec_t active_exit_timestamp;