#!/bin/sh
#
# Bootstrap script for OpenWRT on the D-Link DSL-502T
# Version 1.0
# 
# Copyright (c) 2007 Christopher Pascoe
#

#
# This script fetches the components required to generate an OpenWRT image
# that can be flashed directly onto a D-Link DSL-502T.
#

PATCH_URL=http://www.itee.uq.edu.au/~chrisp/DSL-502T_OpenWRT
DSL502T_PATCH_FILENAME=dsl-502t-openwrt-2.4-1.patch
PPP_CRASH_PATCH_FILENAME=ppp-crash-workarounds.patch
DEFCONFIG_FILENAME=dsl-502t-defconfig

if [ "x`pwd`" = "x$HOME" ]
then
	echo "Are you sure you want to run this in the top level of your home directory?"
	echo "This script downloads files into the current directory."
	echo "Press ctrl-c to abort within 60 seconds if not."
	sleep 60
fi

if [ "x$1" = "xunpatch" ]
then
	if [ ! -f trunk/.cjp_patched ]
	then
		echo "Tree does not appear to be patched."
		exit 1
	fi
	cd trunk
	patch -p0 -R < ../$PPP_CRASH_PATCH_FILENAME
	patch -p0 -R < ../$DSL502T_PATCH_FILENAME
	rm .cjp_patched
	exit 0
fi

makehelp() {
	cat << EOM

To build the tree:

	make -C trunk

After the build completes, the image to flash is:

	trunk/bin/DLinkAU_DSL-502T_openwrt-2.4-squashfs.img

EOM
}

notify() {
	cat << EOM


==============================================================================
$1
==============================================================================

EOM
sleep 1
}

if [ -f trunk/.cjp_patched ]
then
	cat << EOM

You already seem to have run this script.  You should only run it once.

To change configuration options:

	make -C trunk menuconfig
EOM
	makehelp
	exit 1
fi

notify "Downloading patches and default configuration"
if ! wget -N $PATCH_URL/$DSL502T_PATCH_FILENAME $PATCH_URL/$PPP_CRASH_PATCH_FILENAME $PATCH_URL/$DEFCONFIG_FILENAME
then
	echo "Unable to obtain patch or config."
	exit 1
fi

# Check out source and packages
if [ ! -d trunk ]
then
	notify "Checking out OpenWRT trunk"
	svn co https://svn.openwrt.org/openwrt/trunk || exit 1
else
	notify "Updating OpenWRT trunk"
	( cd trunk && exec svn update ) || exit 1
fi
if [ ! -d packages ]
then
	notify "Checking out OpenWRT package tree"
	svn co https://svn.openwrt.org/openwrt/packages || exit 1
else
	notify "Updating OpenWRT package tree"
	( cd packages && exec svn update ) || exit 1
fi

cd trunk || exit 1

# Link in extra packages that were selected
notify "Adding packages based on default configuration"
for i in `grep ^CONFIG_PACKAGE_ ../$DEFCONFIG_FILENAME`
do
        i=${i##CONFIG_PACKAGE_}
        i=${i%%=[my]}
	PDIR=`echo ../packages/*/$i`
	if [ -d package/$i ]
	then
		continue
	elif [ -d "$PDIR" ]
        then
		echo "* Added $i from OpenWRT package tree"
        	ln -sf ../"$PDIR" package/
        fi
done

echo
echo "You can find more packages at: https://dev.openwrt.org/browser/packages"
echo

sleep 2

MD5=""
MD5_DEF=""
if [ -f .config ]
then
	# Compare 
	MD5=`cat .config | egrep -v '^(#|$)' | sort | md5sum -`
	MD5_DEF=`cat ../$DEFCONFIG_FILENAME | egrep -v '^(#|$)' | sort | md5sum -`
fi

if [ "x$MD5" != "x$MD5_DEF" ]
then
	D=`date +%s`
	notify "Resetting configuration.  Your old config will be saved into config.saved.$D"
	mv .config ../config.saved.$D
else
	notify "Selecting default configuration."
fi
cp ../$DEFCONFIG_FILENAME .config

notify "Patching the source tree with DSL-502T specific patches."
if ! patch -p0 < ../$DSL502T_PATCH_FILENAME
then
	exit 1
fi
svn add target/linux/ar7-2.4/image/dsl502t `grep '(revision 0)$' ../$DSL502T_PATCH_FILENAME | awk '{print $2}' | uniq`

notify "Patching the source tree with PPP crash workarounds."
if ! patch -p0 < ../$PPP_CRASH_PATCH_FILENAME
then
	exit 1
fi
:> .cjp_patched || exit 1

notify "Run first configuration."
sleep 2
make menuconfig

makehelp