#!/bin/sh
# makedeb - build .debs out of already-compiled kernel trees
# Copyright (C) 2005  Christian 'Greek0' Aichinger
# 
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
# USA.
#
# If you want to contact me write an email to Greek0@gmx.net

set -e

function make_clean() {
	rm -rf debian conf.vars stamp-*
	if $OOT; then
		rm -rf Documentation
	fi
}

function make_conf_vars() {
	head -n 4 "$SOURCE/Makefile" > conf.vars
}

function AppendMakefile() {
	if ! egrep "^$1 +=" Makefile 1>/dev/null 2>&1; then
		cp Makefile Makefile.new; mv -f Makefile.new Makefile
		egrep "^$1 +=" conf.vars >> Makefile 2>/dev/null
	fi
}

function make_Makefile() {
	if $OOT; then
		AppendMakefile "VERSION"
		AppendMakefile "PATCHLEVEL"
		AppendMakefile "SUBLEVEL"
		AppendMakefile "EXTRAVERSION"
	fi
}

function make_Changes() {
	if $OOT; then
		mkdir -p Documentation
		cp "$SOURCE/Documentation/Changes" Documentation
	fi
}

function make_debian() {
	make-kpkg --rootcmd fakeroot debian
}

function make_buildinfo() {
	COLUMNS=150 dpkg -l 'gcc*' perl dpkg 'libc6*' binutils ldso make dpkg-dev |\
		awk '$$1 ~ /[hi]i/ { printf("%s-%s\n", $$2, $$3) }' > debian/buildinfo

	echo this was built on a machine with the kernel: >> debian/buildinfo
	uname -a >> debian/buildinfo
	echo using the compiler: >> debian/buildinfo
	grep LINUX_COMPILER include/linux/compile.h | \
	sed -e 's/.*LINUX_COMPILER "//' -e 's/"$$//' >> debian/buildinfo
}

function make_stamps() {
	touch stamp-build stamp-configure stamp-kernel-configure
}

function make_package() {
	make-kpkg --rootcmd fakeroot kernel_image
}

function Usage() {
	echo "Usage: $0 [O=<build-tree>] [V=1] <targets>"
	echo "  Supported targets: clean build"
	exit 1
}

function check_tree() {
	if [ ! -e "$SOURCE/include/linux" ]; then
		echo "E: Not in the top-level kernel tree"
		Usage
	fi

	if [ ! -e "vmlinux" ]; then
		echo "E: The tree doesn't seem to be built"
		Usage
	fi
}

###############################
# Main entry point
##############################

SOURCE=`pwd`
OOT=false
VERBOSE=false

# parse commandline arguments
declare -a TARGETS
for i in $@; do
	if echo "$i" | grep -q "^O="; then
		if $OOT; then
			echo "E: An O= option mustn't be passed twice"
			Usage
		fi

		# We got a build-tree option, set the out-of-tree flag and cd to the
		# new location
		OOT=true
		cd "`echo \"$i\" | sed -e 's/^O=//'`"
	elif echo "$i" | grep -q "^V="; then
		if ! echo "$i" | grep -q "^V=1$"; then
			echo "E: Unknown parameter to V=: '$i'"
			Usage
		fi
		VERBOSE=true
	else
		# Append $i to the list of targets
		TARGETS[${#TARGETS[@]}]="$i"
	fi
done

if [ ${#TARGETS[@]} -eq 0 ]; then
	# no targets passed
	TARGETS[0]=build
fi

# Check if source and build tree are ok
check_tree

$VERBOSE && set -x

for i in ${TARGETS[@]}; do
	case "$i" in
		clean)
			make_clean
			;;
		build)
			make_clean
			make_conf_vars
			make_Makefile
			make_Changes
			make_debian
			make_buildinfo
			make_stamps
			make_package
			;;
		*)
			echo "E: unknown target: '$i'"
			Usage
	esac
done