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#!/bin/sh
#
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# builddeb 1.3
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# Copyright 2003 Wichert Akkerman <wichert@wiggy.net>
#
# Simple script to generate a deb package for a Linux kernel. All the
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# complexity of what to do with a kernel after it is installed or removed
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# is left to other scripts and packages: they can install scripts in the
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# /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.
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set -e

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

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	cp debian/copyright "$pdir/usr/share/doc/$pname/"
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	cp debian/changelog "$pdir/usr/share/doc/$pname/changelog.Debian"
	gzip -9 "$pdir/usr/share/doc/$pname/changelog.Debian"
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	sh -c "cd '$pdir'; find . -type f ! -path './DEBIAN/*' -printf '%P\0' \
		| xargs -r0 md5sum > DEBIAN/md5sums"
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	# Fix ownership and permissions
	chown -R root:root "$pdir"
	chmod -R go-w "$pdir"

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	# 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*)
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		debarch=s390$(grep -q CONFIG_64BIT=y $KCONFIG_CONFIG && echo x || true) ;;
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	ppc*)
		debarch=powerpc ;;
	parisc*)
		debarch=hppa ;;
	mips*)
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		debarch=mips$(grep -q CPU_LITTLE_ENDIAN=y $KCONFIG_CONFIG && echo el || true) ;;
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	arm64)
		debarch=arm64 ;;
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	arm*)
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		debarch=arm$(grep -q CONFIG_AEABI=y $KCONFIG_CONFIG && echo el || true) ;;
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	*)
		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 ${0} ..." >&2
		echo "" >&2
	esac
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	if [ -n "$KBUILD_DEBARCH" ] ; then
		debarch="$KBUILD_DEBARCH"
	fi
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	if [ -n "$debarch" ] ; then
		forcearch="-DArchitecture=$debarch"
	fi

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

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

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

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# Setup the directory structure
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rm -rf "$tmpdir" "$fwdir" "$kernel_headers_dir" "$libc_headers_dir" "$dbg_dir"
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mkdir -m 755 -p "$tmpdir/DEBIAN"
mkdir -p  "$tmpdir/lib" "$tmpdir/boot" "$tmpdir/usr/share/doc/$packagename"
mkdir -m 755 -p "$fwdir/DEBIAN"
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mkdir -p "$fwdir/lib/firmware/$version/" "$fwdir/usr/share/doc/$fwpackagename"
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mkdir -m 755 -p "$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/$kernel_headers_packagename"
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mkdir -p "$kernel_headers_dir/lib/modules/$version/"
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if [ "$ARCH" = "um" ] ; then
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	mkdir -p "$tmpdir/usr/lib/uml/modules/$version" "$tmpdir/usr/bin"
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fi
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if [ -n "$BUILD_DEBUG" ] ; then
	mkdir -p "$dbg_dir/usr/share/doc/$dbg_packagename"
	mkdir -m 755 -p "$dbg_dir/DEBIAN"
fi
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# Build and install the kernel
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if [ "$ARCH" = "um" ] ; then
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	$MAKE linux
	cp System.map "$tmpdir/usr/lib/uml/modules/$version/System.map"
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	cp $KCONFIG_CONFIG "$tmpdir/usr/share/doc/$packagename/config"
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	gzip "$tmpdir/usr/share/doc/$packagename/config"
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else
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	cp System.map "$tmpdir/boot/System.map-$version"
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	cp $KCONFIG_CONFIG "$tmpdir/boot/config-$version"
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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"
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fi
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if grep -q '^CONFIG_MODULES=y' $KCONFIG_CONFIG ; then
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	INSTALL_MOD_PATH="$tmpdir" $MAKE KBUILD_SRC= modules_install
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	rm -f "$tmpdir/lib/modules/$version/build"
	rm -f "$tmpdir/lib/modules/$version/source"
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	if [ "$ARCH" = "um" ] ; then
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		mv "$tmpdir/lib/modules/$version"/* "$tmpdir/usr/lib/uml/modules/$version/"
		rmdir "$tmpdir/lib/modules/$version"
	fi
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	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
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				$OBJCOPY --only-keep-debug $module $dbg_dir/usr/lib/debug/$module
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				# strip original module from debug symbols
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				$OBJCOPY --strip-debug $module
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				# then add a link to those
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				$OBJCOPY --add-gnu-debuglink=$dbg_dir/usr/lib/debug/$module $module
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			done
		)
	fi
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fi

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if [ "$ARCH" != "um" ]; then
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	$MAKE headers_check KBUILD_SRC=
	$MAKE headers_install KBUILD_SRC= INSTALL_HDR_PATH="$libc_headers_dir/usr"
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fi
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# Install the maintainer scripts
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# Note: hook scripts under /etc/kernel are also executed by official Debian
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# kernel packages, as well as kernel packages built using make-kpkg.
# make-kpkg sets $INITRD to indicate whether an initramfs is wanted, and
# so do we; recent versions of dracut and initramfs-tools will obey this.
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debhookdir=${KDEB_HOOKDIR:-/etc/kernel}
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if grep -q '^CONFIG_BLK_DEV_INITRD=y' $KCONFIG_CONFIG; then
	want_initrd=Yes
else
	want_initrd=No
fi
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for script in postinst postrm preinst prerm ; do
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	mkdir -p "$tmpdir$debhookdir/$script.d"
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	cat <<EOF > "$tmpdir/DEBIAN/$script"
#!/bin/sh

set -e

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# Pass maintainer script parameters to hook scripts
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export DEB_MAINT_PARAMS="\$*"
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# Tell initramfs builder whether it's wanted
export INITRD=$want_initrd

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

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# 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>"

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# Generate a simple changelog template
cat <<EOF > debian/changelog
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linux-upstream ($packageversion) unstable; urgency=low
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  * Custom built Linux kernel.
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 -- $maintainer  $(date -R)
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EOF

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# 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

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

if [ "$ARCH" = "um" ]; then
	cat <<EOF >> debian/control
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Package: $packagename
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Provides: linux-image, linux-image-2.6, linux-modules-$version
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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
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 files, version: $version.
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EOF

else
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	cat <<EOF >> debian/control
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Package: $packagename
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Provides: linux-image, linux-image-2.6, linux-modules-$version
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Suggests: $fwpackagename
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Architecture: any
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Description: Linux kernel, version $version
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 This package contains the Linux kernel, modules and corresponding other
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 files, version: $version.
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EOF
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fi
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# Build kernel header package
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(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"
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(cd $srctree; find arch/$SRCARCH -name module.lds -o -name Kbuild.platforms -o -name Platform) >> "$objtree/debian/hdrsrcfiles"
(cd $srctree; find $(find arch/$SRCARCH -name include -o -name scripts -type d) -type f) >> "$objtree/debian/hdrsrcfiles"
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(cd $objtree; find arch/$SRCARCH/include Module.symvers include scripts -type f) >> "$objtree/debian/hdrobjfiles"
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destdir=$kernel_headers_dir/usr/src/linux-headers-$version
mkdir -p "$destdir"
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(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 -)
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(cd $objtree; cp $KCONFIG_CONFIG $destdir/.config) # copy .config manually to be where it's expected to be
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ln -sf "/usr/src/linux-headers-$version" "$kernel_headers_dir/lib/modules/$version/build"
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rm -f "$objtree/debian/hdrsrcfiles" "$objtree/debian/hdrobjfiles"
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cat <<EOF >> debian/control

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

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

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

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	create_package "$fwpackagename" "$fwdir"
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fi

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cat <<EOF >> debian/control

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Package: $libc_headers_packagename
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Section: devel
Provides: linux-kernel-headers
Architecture: any
Description: Linux support headers for userspace development
 This package provides userspaces headers from the Linux kernel.  These headers
 are used by the installed headers for GNU glibc and other system libraries.
EOF

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

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create_package "$packagename" "$tmpdir"
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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

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exit 0