service: preserve explicit stop for remain tasks

src/service.c

@@ -1599,6 +1599,15 @@ int service_restart_now(svc_t *svc)
 	if (!svc)
 		return 1;
 
+	if (svc_is_runtask(svc) && svc_is_remain(svc) &&
+	    svc->state == SVC_DONE_STATE) {
+		service_timeout_cancel(svc);
+		svc_restarting(svc);
+		service_step(svc);
+
+		return 0;
+	}
+
 	if (!svc_is_running(svc))
 		return service_start_now(svc);
 
@@ -3378,8 +3387,8 @@ int service_step(svc_t *svc)
 				svc_set_state(svc, SVC_CLEANUP_STATE);
 				service_cleanup_script(svc);
 			} else {
-				/* Unblock remain tasks after post script so they can restart */
-				if (svc_is_remain(svc))
+				/* Restart remain tasks after runlevel/reload/restart teardown. */
+				if (svc_is_remain(svc) && svc_is_restart(svc))
 					svc_unblock(svc);
 				svc_set_state(svc, SVC_HALTED_STATE);
 			}
@@ -3398,13 +3407,17 @@ int service_step(svc_t *svc)
 		break;
 
 	case SVC_DONE_STATE:
-		/* Remain tasks: always run post script when stopped, even if config changed */
-		if (svc_is_runtask(svc) && svc_is_remain(svc) && svc_is_stopped(svc)) {
+		/* Remain tasks run post script before stopping or restarting. */
+		if (svc_is_runtask(svc) && svc_is_remain(svc) &&
+		    (svc_is_stopped(svc) || svc_is_restart(svc))) {
 			if (svc_has_post(svc)) {
 				svc_set_state(svc, SVC_TEARDOWN_STATE);
 				service_post_script(svc);
-			} else
+			} else {
+				if (svc_is_restart(svc))
+					svc_unblock(svc);
 				svc_set_state(svc, SVC_HALTED_STATE);
+			}
 		} else if (svc_is_changed(svc))
 			svc_set_state(svc, SVC_HALTED_STATE);
 		else if (svc_is_runtask(svc) && svc_is_manual(svc) && enabled)
@@ -3727,7 +3740,7 @@ void service_runtask_clean(void)
 
 			/* Config changed or leaving runlevel: stop, run post, restart */
 			svc->once = 0;
-			svc_stop(svc);
+			svc_restarting(svc);
 			service_step(svc);
 			continue;
 		}

test/Makefile.am

@@ -60,6 +60,7 @@ EXTRA_DIST		+= pre-fail.sh
 EXTRA_DIST		+= process-depends.sh
 EXTRA_DIST		+= rclocal.sh
 EXTRA_DIST		+= ready-serv.sh
+EXTRA_DIST		+= remain-task-control.sh
 EXTRA_DIST		+= restart-self.sh
 EXTRA_DIST		+= runlevel.sh
 EXTRA_DIST		+= run-restart-forever.sh
@@ -129,6 +130,7 @@ TESTS			+= pre-fail.sh
 TESTS			+= process-depends.sh
 TESTS			+= rclocal.sh
 TESTS			+= ready-serv.sh
+TESTS			+= remain-task-control.sh
 TESTS			+= restart-self.sh
 TESTS			+= runlevel.sh
 TESTS			+= sysvparts.sh

test/remain-task-control.sh

@@ -0,0 +1,76 @@
+#!/bin/sh
+
+set -eu
+
+TEST_DIR=$(dirname "$0")
+TEST_CONF=/etc/finit.d/remain-task.conf
+STATE=/run/remain-task.state
+
+test_teardown()
+{
+    run "rm -f $TEST_CONF $STATE"
+}
+
+assert_runs()
+{
+    assert "Remain task has run $1 time(s)" \
+           "$(texec initctl -j status remain-task | jq -M .restarts)" -eq "$1"
+}
+
+# shellcheck source=/dev/null
+. "$TEST_DIR/lib/setup.sh"
+
+say 'Add remain task'
+run "cat > $TEST_CONF" <<EOF
+task remain-task {
+    description       = "Remain task control"
+    runlevel          = "2345"
+    remain-after-exit = true
+    command           = "/bin/touch $STATE"
+    exec-stop-post    = "/bin/rm -f $STATE"
+}
+EOF
+run "initctl reload"
+
+retry 'assert_status remain-task done'
+assert_file_exists "$STATE"
+assert_runs 1
+
+say 'Stop remain task'
+run "initctl stop remain-task"
+retry 'assert_status remain-task stopped'
+assert "Post script removed state" \
+       "$(texec sh -c "[ ! -e '$STATE' ] && echo yes")" = yes
+assert_runs 1
+
+say 'Start remain task'
+run "initctl start remain-task"
+retry 'assert_status remain-task done'
+assert_file_exists "$STATE"
+assert_runs 2
+
+say 'Restart remain task'
+run "initctl restart remain-task"
+retry 'assert_runs 3'
+retry 'assert_status remain-task done'
+assert_file_exists "$STATE"
+
+say 'Reload changed remain task'
+run "sed -i 's/Remain task control/Updated remain task control/' $TEST_CONF"
+run "initctl reload"
+retry 'assert_runs 4'
+retry 'assert_status remain-task done'
+assert_file_exists "$STATE"
+
+say 'Leave remain task runlevel'
+run "initctl runlevel 1"
+retry 'assert_status remain-task halted'
+assert "Post script removed state" \
+       "$(texec sh -c "[ ! -e '$STATE' ] && echo yes")" = yes
+assert_runs 4
+
+say 'Re-enter remain task runlevel'
+run "initctl runlevel 2"
+retry 'assert_runs 5'
+retry 'assert_status remain-task done'
+assert_file_exists "$STATE"