Follow-up to 12d14aa, configurable auto-reload of .conf files

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

README.md

@@ -280,6 +280,20 @@ from the kernel, leaving only warnings and errors.  For other kernel
 command line parameters, see [docs/build.md](docs/build.md#recovery).
 
 
+**Automatic Reload**
+
+By default, Finit monitors `/etc/finit.d/` and `/etc/finit.d/enabled/`
+registering any changes to `.conf` files.  To activate a change the user
+must call `initctl reload`, which reloads all modified files, stops any
+removed services, starts new ones, and restarts any modified ones, with
+SIGHUP if the process supports it.
+
+For some use-cases the extra step of calling `initctl reload` creates an
+unnecessary overhead, which can be removed at build-time using:
+
+    configure --enable-auto-reload
+
+
 Runparts & /etc/rc.local
 ------------------------
 

configure.ac

@@ -57,6 +57,10 @@ AC_ARG_ENABLE(fallback_shell,
         AS_HELP_STRING([--enable-fallback-shell], [Start a shell if no TTYs can start]),,[
 	enable_fallback_shell=no])
 
+AC_ARG_ENABLE(auto_reload,
+        AS_HELP_STRING([--enable-auto-reload], [Automatic reload on any .conf change]),,[
+	enable_auto_reload=no])
+
 AC_ARG_ENABLE(rw-rootfs,
         AS_HELP_STRING([--enable-rw-rootfs], [Remount / R/W at boot, usually not for embedded]),,[
 	enable_rw_rootfs=no])
@@ -157,6 +161,9 @@ AS_IF([test "x$enable_emergency_shell" = "xyes"], [
 AS_IF([test "x$enable_fallback_shell" = "xyes"], [
         AC_DEFINE(FALLBACK_SHELL,  1, [Start /bin/sh on console if no TTYs.])])
 
+AS_IF([test "x$enable_auto_reload" = "xyes"], [
+        AC_DEFINE(AUTO_RELOAD, 1, [Finit automatically does `initctl reload` on any .conf change])])
+
 AS_IF([test "x$enable_rw_rootfs" = "xyes"], [
         AC_DEFINE(REMOUNT_ROOTFS,  1, [Remount / as rw at boot])])
 

src/conf.c

@@ -785,8 +785,10 @@ static void conf_cb(uev_t *w, void *arg, int events)
 		}
 	}
 
+#ifdef ENABLE_AUTO_RELOAD
 	if (conf_any_change())
 		service_reload_dynamic();
+#endif
 }
 
 static int add_watcher(uev_ctx_t *ctx, uev_t *w, char *path, uint32_t opt)