#! /bin/sh

# slax-kernel-build.sh
# This script automates the task of rebuilding the Slax 6.1.2 kernel, which is 2.6.27.27.
# You need an internet connection for it to work, or you can get the packages and put
# them in place, then comment the wget lines.
# It will fetch the required files, modify them to work with 2.6.27.27 and prepare
# the scripts so you only need to fire build.kernel, adjust the config, and go for a coffee
# Major credit to Tomas for his 'kit' and to markds for his pointers over various threads
# on the Slax forum.
# Feel free to edit as much as you want/need to.
# This script is licensed under the WTFPL, available at http://sam.zoy.org/wtfpl/

# Written by raydeejay

# Step 1 - Preparing the environment
mkdir -p /usr/src/slax-kernel-build/{patches/squashfs,scripts}

# Step 2 - Get the files and put them in the proper places
# note that subsequent runs of this script will accumulate extra useless files with numerical
# extensions on the cwd.

cd /usr/src/slax-kernel-build
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/aufs.tar.gz
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/build.kernel
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/config
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/get-aufs-cvs.sh
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/lzma457.tar.bz2
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/prepare-crippled-kernel-sources
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/squashfs3.4.tar.gz
cd /usr/src/slax-kernel-build/patches/squashfs
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/patches/squashfs/mksquashfs.quiet.patch
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/patches/squashfs/sqlzma3.4-457.tar.bz2
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/patches/squashfs/unsquashfs.quiet.patch
cd /usr/src/slax-kernel-build/scripts
wget ftp://ftp.slax.org/source/slax/kernel/2.6.27.8/scripts/rc.modules
cd /usr/src/slax-kernel-build
wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.27.27.tar.bz2

# Step 3 - Apply some voodoo to the files:
# - make the scripts act on 2.6.27.27
# - extract the config from the currently running kernel
# - allow for overwriting before menuconfig
# - patch squashfs' code with a missing include
# - fix a bug in the command line that builds the .tgz package

cd /usr/src/slax-kernel-build
mv build.kernel build.kernel.orig
mv prepare-crippled-kernel-sources prepare-crippled-kernel-sources.orig
sed -e "s/2.6.27.8/2.6.27.27/" \
    -e "s/configuring kernel/Press a key to configure kernel, or copy over .config now and then press a key./" \
    -e "s/make oldconfig/zcat \/proc\/config.gz > .config\nread\nmake menuconfig/" \
    -e "s/unsquashfs.quiet.patch/unsquashfs.quiet.patch\ncd \$TMP\/\$KERNEL\nmv fs\/squashfs\/inode.c fs\/squashfs\/inode.c.orig\nsed -e \"33i#include <linux\/sched.h>\" fs\/squashfs\/inode.c.orig > fs\/squashfs\/inode.c/" \
    -e "s/makepkg -l n -c n /makepkg -l n -c n ..\//" \
    build.kernel.orig > build.kernel
sed -e "s/2.6.27.8/2.6.27.27/" prepare-crippled-kernel-sources.orig > prepare-crippled-kernel-sources
chmod +x build.kernel

# Step 4 - Finished
echo "Now execute ./build.kernel, adjust configuration, and wait for it to compile."
exit