kerndev-module-headers

#!/bin/bash
set -e; set -o pipefail; source kerndev-shared.sh

# Heavily based on PKGBUILD from
# https://www.archlinux.org/packages/core/x86_64/linux/

function usage()
{
	echo "usage: $(basename $0) [target dir] <karch?=x86> <make directives>">&2
	exit 1
}

# See http://stackoverflow.com/a/4774063
function get_full_path()
{
	echo "$( cd "$1" ; pwd -P )"
}

([[ -z "$1" ]] || ([[ -f "$1" ]] && [[ ! -d "$1" ]])) && usage

# Generate if doesn't exist.
install -dm755 $1

target_dir=$(get_full_path $1)
karch=${2:-x86}
if [[ "$#" -gt 2 ]]; then
    shift 2
    make_opts="$@"
fi

karch_dir="arch/$karch"
target_karch_dir="$target_dir/$karch_dir"

extra_header_dirs="drivers/md net/mac80211 drivers/media/dvb-core include/config/dvb \
drivers/media/dvb-frontends drivers/media/usb/dvb-usb drivers/media/tuners"

push_linux
trap pop EXIT

[[ ! -f .config ]] && fatal "Missing kernel configuration."
[[ ! -f Module.symvers ]] && fatal "Missing Module.symvers, build kernel to generate."
[[ ! -d "$karch_dir" ]] && fatal "Unrecognised karch: $karch"

echo Running modules_prepare...
make $make_opts modules_prepare >/dev/null

echo Copying required files...

for f in .config Makefile kernel/Makefile Module.symvers Documentation/DocBook/Makefile; do
	install -D -m644 "$f" "$target_dir/$f"
done

# Arch Linux copies only specific directories, however the difference is 31M
# vs. 37M (~168k compressed) so for future-proofing I think it's not much more
# of a cost to just copy everything.
find include -mindepth 1 -maxdepth 1 -type d | \
    xargs -I {} cp -a "{}" "$target_dir/include"

for d in include $extra_header_dirs; do
	[[ -d "$d" ]] && mkdir -p "$target_dir/$d"
done

mkdir -p "$target_karch_dir"
cp -a "$karch_dir/include" "$target_karch_dir"
for h in $(find $karch_dir -iname '*.h'); do
	mkdir -p "$target_dir/$(dirname $h)"
	cp $h "$target_dir/$h"
done

cp -a scripts "$target_dir/scripts"
# Don't strip binaries as only makes 200kb difference...

mkdir -p "$target_karch_dir/kernel"
cp "$karch_dir/Makefile" "$target_karch_dir"

# May as well always copy these if available.
for f in Makefile_32.cpu kernel/asm-offsets.s; do
	p="$karch_dir/$f"
	[[ -f $p ]] && cp "$p" "$target_karch_dir/$f"
done

# Copy in extra headers. Directories already created above.
for d in $extra_header_dirs; do
	[[ -d "$d" ]] && cp $d/*.h "$target_dir/$d"
done

# Specific required files.
mkdir -p "$target_dir/drivers/media/i2c/"
cp drivers/media/i2c/msp3400-driver.h "$target_dir/drivers/media/i2c/"

# Copy in Kconfig files.
for f in $(find . -name "Kconfig*"); do
	mkdir -p "$target_dir/$(dirname $f)"
	cp $f "$target_dir/$f"
done

say_done