Fix 'initctl reload NAME' not updating conditions for dependents

When reloading a specific service with 'initctl reload foo', the
pid/foo and service/foo/ready conditions were never cleared, so
dependent services were not notified of the reload.

Clear the service's pid condition and, for pid/none notify types,
the ready condition before reloading.  The conditions are then
reasserted by the pidfile inotify handler when the service touches
its PID file after processing SIGHUP.

For s6/systemd services the ready condition is left intact since
their readiness notification may not re-trigger on SIGHUP.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/api.c

@@ -112,6 +112,8 @@ static int restart(svc_t *svc, void *user_data)
 
 static int reload(svc_t *svc, void *user_data)
 {
+	char cond[MAX_COND_LEN];
+
 	(void)user_data;
 
 	if (!svc)
@@ -122,6 +124,20 @@ static int reload(svc_t *svc, void *user_data)
 	else
 		service_timeout_cancel(svc);
 
+	/*
+	 * Clear conditions before reload to ensure dependent services
+	 * are properly updated.  The conditions are reasserted when
+	 * the service touches its PID file after processing SIGHUP.
+	 *
+	 * Note: only clear 'ready' for services where the pidfile
+	 * inotify handler reasserts it (pid/none).  For s6/systemd
+	 * services readiness relies on their respective notification
+	 * mechanism which may not re-trigger on SIGHUP.
+	 */
+	cond_clear(mkcond(svc, cond, sizeof(cond)));
+	if (svc->notify == SVC_NOTIFY_PID || svc->notify == SVC_NOTIFY_NONE)
+		service_ready(svc, 0);
+
 	svc_mark_dirty(svc);
 	service_step(svc);