#!/bin/sh
#
# This is the hook file executed by make-kpkg in the end of creation
# of the linux-image for a particular flavour. The major task it performs
# is the creation of the flavour-specific linux-headers package.
#
set -e

debhelper_pre() {
	dh_clean -k --package="$1"
	dh_installdirs --package="$1"
}

debhelper_post() {
	dh_installdocs --package="$1"
	dh_installchangelogs --package="$1"
	dh_compress --package="$1"
	dh_fixperms --package="$1"
	dh_installdeb --package="$1"
	dh_gencontrol --package="$1"
	dh_md5sums --package="$1"
	dh_builddeb --package="$1"
}
# The version which ends up here is something like
# $(version)-$(abiname)-$(flavour) and debnum is just
# -$(abiname), so that the variables get the values:
# suffix=$(flavour)
# prefix=$(version)-$(abiname)
# prefix is then used to form a destination directory
# to link to. For cases with subarch we need to link
# to linux-headers-$(subarch)-$(version)-$(abiname),
# not just linux-headers-$(version)-$(abiname). Note
# that the append_subarch substitution must contain a
# trailing dash, if it is non-empty.
#
append='@append_subarch@'
suffix=${version#*$debnum-}
prefix=${append}${version%%-*}${debnum}
pkg=linux-headers-$version
top=$PWD/debian/$pkg
dir=$top/usr/src/linux-headers-$version
#
# Here we need to find the kernel architecture which
# is appropriate for the current flavour. It is available
# in kernel-package as KERNEL_ARCH. Cleanest way is to get
# make-kpkg export it to this script. 
# 
# Currently we just use the fact that in the build directory
# the symlink include/asm must point to include/asm-${arch}
#
arch=$(readlink include/asm)
arch=$(basename "${arch}")
arch="${arch#asm-}"

debhelper_pre $pkg

#
# Stuff below is ugly as hell, but does the trick so I'm not
# touching it until we can invent something better.
#
mkdir -p $dir/include/linux
cp -a .config $dir
echo $debnum-$suffix > $dir/.extraversion
cp -a Module.symvers $dir

find . -mindepth 1 -maxdepth 1 \
	! -name debian -a ! -name Documentation -a ! -name include -a \
	! -name DEBIAN -a ! -name '.*' -a \( \
	-name Makefile -o -type d \) \
	-printf "../linux-headers-$prefix/%f\n" |
	xargs ln -s --target-directory="$dir"

cd include
find . -mindepth 1 -maxdepth 1 \
	! -name config -a ! -name linux -a \( \
	! -name 'asm-*' -o -name asm-generic -o -name asm-${arch} \) \
	-printf "../../linux-headers-$prefix/include/%f\n" |
	xargs ln -s --target-directory=$dir/include
cp -a config $dir/include
ln -sf asm-${arch} $dir/include/asm
find linux -mindepth 1 -maxdepth 1 \
	! -name autoconf.h -a ! -name compile.h -a ! -name version.h \
	-printf "../../../linux-headers-$prefix/include/linux/%f\n" |
	xargs ln -s --target-directory=$dir/include/linux
cp -a linux/autoconf.h linux/compile.h \
	linux/version.h $dir/include/linux
cd ..

mkdir -p $top/lib/modules/$version
ln -s /usr/src/linux-headers-$version $top/lib/modules/$version/build

debhelper_post $pkg

#
# Check whether we should force any modules to be available
# on the initrd.
#
cd ${IMAGE_TOP}/lib/modules/${version}
modules='@initrd_modules@'
if [ -n "${modules}" ]; then
  mkdir initrd
  for i in ${modules}; do
    if [ -f "${i}" ]; then
      ln "${i}" initrd
    fi
  done
fi
#
# Clean up the build and source symlinks
#
if [ -L build ]; then
  rm -f build
fi
if [ -L source ]; then
  rm -f source
fi