Only reload .conf and services if any .conf file has changed

This patch is an optimization.  Now that we monitor for any .conf file
changes (as soon as the event loop starts) we can skip automatic reload
of all .conf files and services if no .conf file has changed.  Unless
the user issues an `initctl reload`, `init q`, or sends us SIGHUP.

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

src/conf.c

@@ -633,6 +633,14 @@ static int do_change(char *name, uint32_t mask)
 	return 0;
 }
 
+int conf_any_change(void)
+{
+	if (TAILQ_EMPTY(&conf_change_list))
+		return 0;
+
+	return 1;
+}
+
 int conf_changed(char *file)
 {
 	char *ptr;

src/conf.h

@@ -33,6 +33,7 @@ char *rlim2str(int rlim);
 
 int  conf_init            (void);
 void conf_reload          (void);
+int  conf_any_change      (void);
 int  conf_changed         (char *file);
 int  conf_monitor         (uev_ctx_t *ctx);
 

src/finit.c

@@ -291,13 +291,15 @@ static void finalize(void)
 	if (runparts && fisdir(runparts)) {
 		_d("Running startup scripts in %s ...", runparts);
 		run_parts(runparts, NULL);
-		service_reload_dynamic();
+		if (conf_any_change())
+			service_reload_dynamic();
 	}
 
 	/* Convenient SysV compat for when you just don't care ... */
 	if (!access(FINIT_RC_LOCAL, X_OK)) {
 		run_interactive(FINIT_RC_LOCAL, "Calling %s", FINIT_RC_LOCAL);
-		service_reload_dynamic();
+		if (conf_any_change())
+			service_reload_dynamic();
 	}
 
 	/* Hooks that should run at the very end */

src/sm.c

@@ -143,7 +143,7 @@ restart:
 			erase("/etc/nologin");
 
 		/* Make sure to (re)load all *.conf in /etc/finit.d/ */
-		if (runlevel != 0 && runlevel != 6)
+		if (conf_any_change())
 			conf_reload();
 
 		/* Reset once flag of runtasks */