#!/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$(grep -q CPU_LITTLE_ENDIAN=y .config && echo el) ;;
	arm*)
		debarch=arm$(grep -q CONFIG_AEABI=y .config && echo el) ;;
	*)
		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 $forcearch -p$pname -P"$pdir"
	dpkg --build "$pdir" ..
}

# Some variables and settings used throughout the script
version=$KERNELRELEASE
revision=$(cat .version)
if [ -n "$KDEB_PKGVERSION" ]; then
	packageversion=$KDEB_PKGVERSION
else
	packageversion=$version-$revision
fi
tmpdir="$objtree/debian/tmp"
fwdir="$objtree/debian/fwtmp"
hdrdir="$objtree/debian/hdrtmp"
packagename=linux-image-$version
fwpackagename=linux-firmware-image
hdrpackagename=linux-headers-$version

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

# Setup the directory structure
rm -rf "$tmpdir" "$fwdir" "$hdrdir"
mkdir -m 755 -p "$tmpdir/DEBIAN"
mkdir -p  "$tmpdir/lib" "$tmpdir/boot" "$tmpdir/usr/share/doc/$packagename"
mkdir -m 755 -p "$fwdir/DEBIAN"
mkdir -p "$fwdir/lib" "$fwdir/usr/share/doc/$fwpackagename"
if [ "$ARCH" = "um" ] ; then
	mkdir -p "$tmpdir/usr/lib/uml/modules/$version" "$tmpdir/usr/bin"
fi

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

if grep -q '^CONFIG_MODULES=y' .config ; then
	INSTALL_MOD_PATH="$tmpdir" make KBUILD_SRC= modules_install
	if [ "$ARCH" = "um" ] ; then
		mv "$tmpdir/lib/modules/$version"/* "$tmpdir/usr/lib/uml/modules/$version/"
		rmdir "$tmpdir/lib/modules/$version"
	fi
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" $debhookdir/$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
linux-upstream ($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: linux-upstream
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
find . -name Makefile -o -name Kconfig\* -o -name \*.pl > /tmp/files$$
find arch/x86/include include scripts -type f >> /tmp/files$$
(cd $objtree; find .config Module.symvers include scripts -type f >> /tmp/objfiles$$)
destdir=$hdrdir/usr/src/linux-headers-$version
mkdir -p "$destdir" "$hdrdir/DEBIAN" "$hdrdir/usr/share/doc/$hdrpackagename"
tar -c -f - -T /tmp/files$$ | (cd $destdir; tar -xf -)
(cd $objtree; tar -c -f - -T /tmp/objfiles$$) | (cd $destdir; tar -xf -)
rm -f /tmp/files$$ /tmp/objfiles$$
arch=$(dpkg --print-architecture)

cat <<EOF >> debian/control

Package: $hdrpackagename
Provides: linux-headers, linux-headers-2.6
Architecture: $arch
Description: Linux kernel headers for $KERNELRELEASE on $arch
 This package provides kernel header files for $KERNELRELEASE on $arch
 .
 This is useful for people who need to build external modules
EOF

create_package "$hdrpackagename" "$hdrdir"

# 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/"

	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

create_package "$packagename" "$tmpdir"

exit 0