plugins: modules-load: skip lines starting with '#'

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

doc/plugins.md

@@ -40,7 +40,10 @@ For your convenience a set of *optional* plugins are available:
 * *rtc.so*: Restore and save system clock from/to RTC on boot/halt.
   Enabled by default.
 
-* *modules-load.so*: Scans /etc/modules-load.d for modules to modprobe.
+* *modules-load.so*: Scans `/etc/modules-load.d/` for modules to load
+  using `modprobe`.  Each file in this directory can contain multiple
+  lines with the name of the module to load.  Any line starting with
+  the standard UNIX comment character, `#`, is skipped.
 
 * *netlink.so*: Listens to Linux kernel Netlink events for gateway and
   interfaces.  These events are then sent to the Finit service monitor

plugins/modules-load.c

@@ -69,6 +69,9 @@ static void load(void *arg)
 		while (fgets(line, sizeof(line), fp)) {
 			char cmd[CMD_SIZE], *mod, *args;
 
+			if (line[0] == '#')
+				continue;
+
 			mod = strip_line(line);
 			if (!*mod)
 				continue;