rc: revamp rc.loader

We only merge chunks for loader.conf leaveraging a priority scheme
in order to be able to override standard modifications made by e.g.
core or plugins (in case of user changes).

Start to work on its scripts, but 20-console is dynamic so it needs
more work in the actual PHP code.

Discussed with: @adschellevis

src/etc/rc.loader

-#!/usr/local/bin/python2.7
+#!/bin/sh
 
-# Copyright (c) 2016 Ad Schellevis
+# Copyright (c) 2016 Franco Fichtner <franco@opnsense.org>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -25,20 +25,36 @@
 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 # SUCH DAMAGE.
 
-import os
-import glob
-import sys
+# Files are sorted and should adhere to the following
+# rule of thumb: "dd-identifier", for core package
+# loader.conf chunks should generally use something
+# like "20-mycorevars" and for plugin packages rather
+# "50-mypluginvars".
+#
+# It could be useful for the user to order variables
+# or set a higher/lower priority in case some
+# use case requires a slightly different setup.
+
+LOADERDIR="/usr/local/etc/rc.loader.d"
+LOADERCONF="/boot/loader.conf"
+
+: > ${LOADERCONF}
+
+if [ ! -d ${LOADERDIR} ]; then
+	# no dir no fun
+	exit 0;
+fi
+
+# collect all matching scripts
+LOADERCHUNKS=$(find -s ${LOADERDIR} -type f)
+
+for LOADERCHUNK in ${LOADERCHUNKS}; do
+	# extract loader chunk origin
+	LOADERCHUNK=${LOADERCHUNK##"${LOADERDIR}/"}
 
-loader_dir="/usr/local/etc/rc.loader.d"
-loader_conf_local='/boot/loader.conf.local'
+	echo "rc.loader: assembling ${LOADERCHUNK#??-}"
 
-if not os.path.isdir(loader_dir):
-    sys.exit(0)
+	cat ${LOADERDIR}/${LOADERCHUNK} >> ${LOADERCONF}
+done
 
-loader_conf_local_items=list()
-for filename in glob.glob('%s/*'%loader_dir):
-    prop_name = os.path.basename(filename)
-    prop_value = open(filename,'r').read().strip()
-    loader_conf_local_items.append('%s="%s"'%(prop_name, prop_value))
-# dump collected properies
-open(loader_conf_local,'w').write('%s\n'%'\n'.join(loader_conf_local_items))
+exit 0

src/etc/rc.loader.d/20-brand

+loader_brand="opnsense"
+loader_logo="hourglass"
+loader_menu_title=""

src/etc/rc.loader.d/20-misc

+autoboot_delay="3"
+hw.usb.no_pf="1"