Only mark rdeps dirty if main service is nohup

This patch changes a behavior that's been default since Finit 4.0,
introduced in 4d05bf9 with 4.0-rc2.

If service B depends on A and A needs to be reloaded, then B may be
affected.  If A is declared as NOHUP <!>, then A will be stopped and
restarted, during which time the condition it provides is removed,
and B will also be stopped.

However, and as of this patch, if A is declared supporting HUP, then the
condition A provides will only go into flux, during which time B will be
SIGSTOPed instead of needing to be reloaded.

Fix #415

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

src/service.c

@@ -2001,6 +2001,10 @@ static void svc_mark_affected(char *cond)
  * Called on conf_reload() to update service reverse dependencies.
  * E.g., if ospfd depends on zebra and the zebra Finit conf has
  * changed, we need to mark the ospfd Finit conf as changed too.
+ *
+ * However, a daemon that depends on syslogd (sysklogd project), need
+ * not be reloeaded (SIGHUP'ed or stop/started) because syslogd support
+ * reloading its configuration file on SIGHUP.
  */
 void service_update_rdeps(void)
 {
@@ -2012,6 +2016,10 @@ void service_update_rdeps(void)
 		if (!svc_is_changed(svc))
 			continue;
 
+		/* Service supports reloading conf without stop/start  */
+		if (!svc_is_nohup(svc))
+			continue; /* Yup, no need to stop start rdeps */
+
 		svc_mark_affected(mkcond(svc, cond, sizeof(cond)));
 	}
 }

src/svc.h

@@ -259,6 +259,7 @@ static inline int svc_is_tty       (svc_t *svc) { return svc && SVC_TYPE_TTY
 static inline int svc_is_runtask   (svc_t *svc) { return svc && (SVC_TYPE_RUNTASK & svc->type);}
 static inline int svc_is_forking   (svc_t *svc) { return svc && svc->forking; }
 static inline int svc_is_manual    (svc_t *svc) { return svc && svc->manual; }
+static inline int svc_is_nohup     (svc_t *svc) { return svc && (0 == svc->sighup); }
 
 static inline int svc_in_runlevel  (svc_t *svc, int runlevel) { return svc && ISSET(svc->runlevels, runlevel); }
 static inline int svc_nohup        (svc_t *svc) { return svc &&  (0 == svc->sighup || 0 != svc->args_dirty); }