#!/bin/sh
#
# builddeb 1.3
# Copyright 2003 Wichert Akkerman <wichert@wiggy.net>
#
# Simple script to generate a deb package for a Linux kernel. All the
# complexity of what to do with a kernel after it is installed or removed
# is left to other scripts and packages: they can install scripts in the
# /etc/kernel/{pre,post}{inst,rm}.d/ directories (or an alternative location
# specified in KDEB_HOOKDIR) that will be called on package install and
# removal.

set -e

create_package() {
	local pname="$1" pdir="$2"

	cp debian/copyright "$pdir/usr/share/doc/$pname/"
	cp debian/changelog "$pdir/usr/share/doc/$pname/changelog.Debian"
	gzip -9 "$pdir/usr/share/doc/$pname/changelog.Debian"
	sh -c "cd '$pdir'; find . -type f ! -path './DEBIAN/*' -printf '%P\0' \
		| xargs -r0 md5sum > DEBIAN/md5sums"

	# Fix ownership and permissions
	chown -R root:root "$pdir"
	chmod -R go-w "$pdir"

	# Attempt to find the correct Debian architecture
	local forcearch="" debarch=""
	case "$UTS_MACHINE" in
	i386|ia64|alpha)
		debarch="$UTS_MACHINE" ;;
	x86_64)
		debarch=amd64 ;;
	sparc*)
		debarch=sparc ;;
	s390*)
		debarch=s390 ;;
	ppc*)
		debarch=powerpc ;;
	parisc*)
		debarch=hppa ;;
	mips*)
		debarch=mips$(grep -q CPU_LITTLE_ENDIAN=y $KCONFIG_CONFIG && echo el || true) ;;
	arm*)
		debarch=arm$(grep -q CONFIG_AEABI=y $KCONFIG_CONFIG && echo el || true) ;;
	*)
		echo "" >&2
		echo "** ** **  WARNING  ** ** **" >&2
		echo "" >&2
		echo "Your architecture doesn't have it's equivalent" >&2
		echo "Debian userspace architecture defined!" >&2
		echo "Falling back to using your current userspace instead!" >&2
		echo "Please add support for $UTS_MACHINE to ${0} ..." >&2
		echo "" >&2
	esac
	if [ -n "$KBUILD_DEBARCH" ] ; then
		debarch="$KBUILD_DEBARCH"
	fi
	if [ -n "$debarch" ] ; then
		forcearch="-DArchitecture=$debarch"
	fi

	# Create the package
	dpkg-gencontrol -isp -Vkernel:debarch="${debarch:-$(dpkg --print-architecture)}" -p$pname -P"$pdir"
	dpkg --build "$pdir" ..
}

# Some variables and settings used throughout the script
version=$KERNELRELEASE
if [ -n "$KDEB_PKGVERSION" ]; then
	packageversion=$KDEB_PKGVERSION
else
	packageversion=$version-$(cat .version)
fi
tmpdir="$objtree/debian/tmp"
fwdir="$objtree/debian/fwtmp"
kernel_headers_dir="$objtree/debian/hdrtmp"
libc_headers_dir="$objtree/debian/headertmp"
dbg_dir="$objtree/debian/dbgtmp"
packagename=linux-image-$version
fwpackagename=linux-firmware-image-$version
kernel_headers_packagename=linux-headers-$version
libc_headers_packagename=linux-libc-dev-$KBUILD_DEBARCH-cross
dbg_packagename=$packagename-dbg

if [ "$ARCH" = "um" ] ; then
	packagename=user-mode-linux-$version
fi

# Not all arches have the same installed path in debian
# XXX: have each arch Makefile export a variable of the canonical image install
# path instead
case $ARCH in
um)
	installed_image_path="usr/bin/linux-$version"
	;;
parisc|mips|powerpc)
	installed_image_path="boot/vmlinux-$version"
	;;
*)
	installed_image_path="boot/vmlinuz-$version"
esac

BUILD_DEBUG="$(grep -s '^CONFIG_DEBUG_INFO=y' $KCONFIG_CONFIG || true)"

# Setup the directory structure
rm -rf "$tmpdir" "$fwdir" "$kernel_headers_dir" "$libc_headers_dir" "$dbg_dir"
mkdir -m 755 -p "$tmpdir/DEBIAN"
mkdir -p  "$tmpdir/lib" "$tmpdir/boot" "$tmpdir/usr/share/doc/$packagename"
mkdir -m 755 -p "$fwdir/DEBIAN"
mkdir -p "$fwdir/lib/firmware/$version/" "$fwdir/usr/share/doc/$fwpackagename"
mkdir -m 755 -p "$libc_headers_dir/DEBIAN"
mkdir -p "$libc_headers_dir/usr/share/doc/$libc_headers_packagename"
mkdir -m 755 -p "$kernel_headers_dir/DEBIAN"
mkdir -p "$kernel_headers_dir/usr/share/doc/$kernel_headers_packagename"
mkdir -p "$kernel_headers_dir/lib/modules/$version/"
if [ "$ARCH" = "um" ] ; then
	mkdir -p "$tmpdir/usr/lib/uml/modules/$version" "$tmpdir/usr/bin"
fi
if [ -n "$BUILD_DEBUG" ] ; then
	mkdir -p "$dbg_dir/usr/share/doc/$dbg_packagename"
	mkdir -m 755 -p "$dbg_dir/DEBIAN"
fi

# # Build and install the kernel
# if [ "$ARCH" = "um" ] ; then
# 	$MAKE linux
# 	cp System.map "$tmpdir/usr/lib/uml/modules/$version/System.map"
# 	cp $KCONFIG_CONFIG "$tmpdir/usr/share/doc/$packagename/config"
# 	gzip "$tmpdir/usr/share/doc/$packagename/config"
# else 
# 	cp System.map "$tmpdir/boot/System.map-$version"
# 	cp $KCONFIG_CONFIG "$tmpdir/boot/config-$version"
# fi
# # Not all arches include the boot path in KBUILD_IMAGE
# if [ -e $KBUILD_IMAGE ]; then
# 	cp $KBUILD_IMAGE "$tmpdir/$installed_image_path"
# else
# 	cp arch/$ARCH/boot/$KBUILD_IMAGE "$tmpdir/$installed_image_path"
# fi

# if grep -q '^CONFIG_MODULES=y' $KCONFIG_CONFIG ; then
# 	INSTALL_MOD_PATH="$tmpdir" $MAKE KBUILD_SRC= modules_install
# 	rm -f "$tmpdir/lib/modules/$version/build"
# 	rm -f "$tmpdir/lib/modules/$version/source"
# 	if [ "$ARCH" = "um" ] ; then
# 		mv "$tmpdir/lib/modules/$version"/* "$tmpdir/usr/lib/uml/modules/$version/"
# 		rmdir "$tmpdir/lib/modules/$version"
# 	fi
# 	if [ -n "$BUILD_DEBUG" ] ; then
# 		(
# 			cd $tmpdir
# 			for module in $(find lib/modules/ -name *.ko); do
# 				mkdir -p $(dirname $dbg_dir/usr/lib/debug/$module)
# 				# only keep debug symbols in the debug file
# 				$OBJCOPY --only-keep-debug $module $dbg_dir/usr/lib/debug/$module
# 				# strip original module from debug symbols
# 				$OBJCOPY --strip-debug $module
# 				# then add a link to those
# 				$OBJCOPY --add-gnu-debuglink=$dbg_dir/usr/lib/debug/$module $module
# 			done
# 		)
# 	fi
# fi

# if [ "$ARCH" != "um" ]; then
# 	$MAKE headers_check KBUILD_SRC=
	$MAKE headers_install KBUILD_SRC= INSTALL_HDR_PATH="$libc_headers_dir/usr"
# fi

# Install the maintainer scripts
# Note: hook scripts under /etc/kernel are also executed by official Debian
# kernel packages, as well as kernel packages built using make-kpkg
# debhookdir=${KDEB_HOOKDIR:-/etc/kernel}
# for script in postinst postrm preinst prerm ; do
# 	mkdir -p "$tmpdir$debhookdir/$script.d"
# 	cat <<EOF > "$tmpdir/DEBIAN/$script"
# #!/bin/sh

# set -e

# # Pass maintainer script parameters to hook scripts
# export DEB_MAINT_PARAMS="\$*"

# test -d $debhookdir/$script.d && run-parts --arg="$version" --arg="/$installed_image_path" $debhookdir/$script.d
# exit 0
# EOF
# 	chmod 755 "$tmpdir/DEBIAN/$script"
# done

# Try to determine maintainer and email values
if [ -n "$DEBEMAIL" ]; then
       email=$DEBEMAIL
elif [ -n "$EMAIL" ]; then
       email=$EMAIL
else
       email=$(id -nu)@$(hostname -f)
fi
if [ -n "$DEBFULLNAME" ]; then
       name=$DEBFULLNAME
elif [ -n "$NAME" ]; then
       name=$NAME
else
       name="Anonymous"
fi
maintainer="$name <$email>"

# Generate a simple changelog template
cat <<EOF > debian/changelog
cross-toolchain-base ($packageversion) unstable; urgency=low

  * Custom built Linux kernel.

 -- $maintainer  $(date -R)
EOF

# Generate copyright file
cat <<EOF > debian/copyright
This is a packacked upstream version of the Linux kernel.

The sources may be found at most Linux ftp sites, including:
ftp://ftp.kernel.org/pub/linux/kernel

Copyright: 1991 - 2009 Linus Torvalds and others.

The git repository for mainline kernel development is at:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

    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; version 2 dated June, 1991.

On Debian GNU/Linux systems, the complete text of the GNU General Public
License version 2 can be found in \`/usr/share/common-licenses/GPL-2'.
EOF

# Generate a control file
cat <<EOF > debian/control
Source: cross-toolchain-base
Section: kernel
Priority: optional
Maintainer: $maintainer
Standards-Version: 3.8.4
Homepage: http://www.kernel.org/
EOF

# if [ "$ARCH" = "um" ]; then
# 	cat <<EOF >> debian/control

# Package: $packagename
# Provides: linux-image, linux-image-2.6, linux-modules-$version
# Architecture: any
# Description: User Mode Linux kernel, version $version
#  User-mode Linux is a port of the Linux kernel to its own system call
#  interface.  It provides a kind of virtual machine, which runs Linux
#  as a user process under another Linux kernel.  This is useful for
#  kernel development, sandboxes, jails, experimentation, and
#  many other things.
#  .
#  This package contains the Linux kernel, modules and corresponding other
#  files, version: $version.
# EOF

# else
# 	cat <<EOF >> debian/control

# Package: $packagename
# Provides: linux-image, linux-image-2.6, linux-modules-$version
# Suggests: $fwpackagename
# Architecture: any
# Description: Linux kernel, version $version
#  This package contains the Linux kernel, modules and corresponding other
#  files, version: $version.
# EOF

# fi

# Build header package
# (cd $srctree; find . -name Makefile\* -o -name Kconfig\* -o -name \*.pl > "$objtree/debian/hdrsrcfiles")
# (cd $srctree; find arch/$SRCARCH/include include scripts -type f >> "$objtree/debian/hdrsrcfiles")
# (cd $objtree; find arch/$SRCARCH/include Module.symvers include scripts -type f >> "$objtree/debian/hdrobjfiles")
# destdir=$kernel_headers_dir/usr/src/linux-headers-$version
# mkdir -p "$destdir"
# (cd $srctree; tar -c -f - -T "$objtree/debian/hdrsrcfiles") | (cd $destdir; tar -xf -)
# (cd $objtree; tar -c -f - -T "$objtree/debian/hdrobjfiles") | (cd $destdir; tar -xf -)
# (cd $objtree; cp $KCONFIG_CONFIG $destdir/.config) # copy .config manually to be where it's expected to be
# ln -sf "/usr/src/linux-headers-$version" "$kernel_headers_dir/lib/modules/$version/build"
# rm -f "$objtree/debian/hdrsrcfiles" "$objtree/debian/hdrobjfiles"

# cat <<EOF >> debian/control

# Package: $kernel_headers_packagename
# Provides: linux-headers, linux-headers-2.6
# Architecture: any
# Description: Linux kernel headers for $KERNELRELEASE on \${kernel:debarch}
#  This package provides kernel header files for $KERNELRELEASE on \${kernel:debarch}
#  .
#  This is useful for people who need to build external modules
# EOF

# # Do we have firmware? Move it out of the way and build it into a package.
# if [ -e "$tmpdir/lib/firmware" ]; then
# 	mv "$tmpdir/lib/firmware"/* "$fwdir/lib/firmware/$version/"
# 	rmdir "$tmpdir/lib/firmware"

# 	cat <<EOF >> debian/control

# Package: $fwpackagename
# Architecture: all
# Description: Linux kernel firmware, version $version
#  This package contains firmware from the Linux kernel, version $version.
# EOF

# 	create_package "$fwpackagename" "$fwdir"
# fi

cat <<EOF >> debian/control

Package: $libc_headers_packagename
Section: devel
Architecture: all
Provides: linux-kernel-headers-${KBUILD_DEBARCH}-cross, linux-libc-dev-${KBUILD_DEBARCH}-dcv1
Description: Linux Kernel Headers for development (for cross-compiling)
 This package was generated by dpkg-cross for cross compiling.
 .
 This package provides headers from the Linux kernel.  These headers
 are used by the installed headers for GNU glibc and other system
 libraries. They are NOT meant to be used to build third-party modules for
 your kernel. Use linux-headers-* packages for that.

EOF

# if [ "$ARCH" != "um" ]; then
# 	create_package "$kernel_headers_packagename" "$kernel_headers_dir"
	create_package "$libc_headers_packagename" "$libc_headers_dir"
# fi

# create_package "$packagename" "$tmpdir"

# if [ -n "$BUILD_DEBUG" ] ; then
# 	# Build debug package
# 	# Different tools want the image in different locations
# 	# perf
# 	mkdir -p $dbg_dir/usr/lib/debug/lib/modules/$version/
# 	cp vmlinux $dbg_dir/usr/lib/debug/lib/modules/$version/
# 	# systemtap
# 	mkdir -p $dbg_dir/usr/lib/debug/boot/
# 	ln -s ../lib/modules/$version/vmlinux $dbg_dir/usr/lib/debug/boot/vmlinux-$version
# 	# kdump-tools
# 	ln -s lib/modules/$version/vmlinux $dbg_dir/usr/lib/debug/vmlinux-$version

# 	cat <<EOF >> debian/control

# Package: $dbg_packagename
# Section: debug
# Provides: linux-debug, linux-debug-$version
# Architecture: any
# Description: Linux kernel debugging symbols for $version
#  This package will come in handy if you need to debug the kernel. It provides
#  all the necessary debug symbols for the kernel and its modules.
# EOF

# 	create_package "$dbg_packagename" "$dbg_dir"
# fi

exit 0