#!/bin/bash

#

# This script is aimed at generating the headers from the kernel sources.

# You should have a checkout of kernel-headers inside the kernel directory 'fedpkg clone kernel-headers'

# You will need to prep the kernel sources with 'make prep' or 'fedpkg prep' before running this script

#

# Author: Herton R. Krzesinski <herton@redhat.com>

# Author: Justin M. Forbes <jforbes@redhat.com>

set -e

# Location of kernel-headers checkout

CURRENTDIR=`pwd`

PKGLOC='kernel-headers'

if [ ! -f $PKGLOC/kernel-headers.spec ]; then

	echo "Missing checkout of kernel-headers in $PKGLOC"

	exit 1

fi

# Kernel version information taken from kernel.spec and change to prepared sources directory

MAJORVER='5'

RELEASED=`grep "%global released_kernel" kernel.spec| cut -d ' ' -f 3`

BASERELEASE=`cat kernel.spec | grep "%global baserelease" | cut -d ' ' -f 3`

BASE=`grep "%define base_sublevel" kernel.spec| cut -d ' ' -f 3`

STABLE=`grep "%define stable_update" kernel.spec| cut -d ' ' -f 3`

RC=`grep "%global rcrev" kernel.spec| cut -d ' ' -f 3`

GITREV=`grep "%define gitrev" kernel.spec| cut -d ' ' -f 3`

BUILDID=`grep "^%define buildid" kernel.spec| cut -d ' ' -f 3`

if [ $RELEASED -eq 0 ]; then

	cd kernel-$MAJORVER.$BASE.fc??

	NEWBASE=$(($BASE+1))

	KVER=$MAJORVER.$NEWBASE.0-0.rc$RC.git$GITREV

	cd linux-$MAJORVER.$NEWBASE.0-0.rc$RC.git$GITREV.$BASERELEASE$BUILDID.fc*/

else

	cd kernel-$MAJORVER.$BASE.fc??/linux-$MAJORVER.$BASE.$STABLE-$BASERELEASE$BUILDID.fc*/

	KVER=$MAJORVER.$BASE.$STABLE

fi

# ARCH_LIST below has the default list of supported architectures

# (the architectures names may be different from rpm, you list here the

# names of arch/<arch> directories in the kernel sources)

ARCH_LIST="arm arm64 powerpc riscv s390 x86"

headers_dir=$(mktemp -d)

trap 'rm -rf "$headers_dir"' SIGHUP SIGINT SIGTERM EXIT

archs=${ARCH_LIST:-$(ls arch)}

echo $archs

# Upstream rmeoved the headers_install_all target so do it manually

for arch in $archs; do

	mkdir $headers_dir/arch-$arch

	make ARCH=$arch INSTALL_HDR_PATH=$headers_dir/arch-$arch KBUILD_HEADERS=install headers_install

done

find $headers_dir \

	\( -name .install -o -name .check -o \

	-name ..install.cmd -o -name ..check.cmd \) | xargs rm -f

TARBALL=$CURRENTDIR/$PKGLOC/kernel-headers-$KVER.tar.xz

pushd $headers_dir

	tar -Jcf $TARBALL *

popd

echo wrote $TARBALL

# Update kernel-headers.spec

cd $CURRENTDIR/$PKGLOC/

BASE=$BASE perl -p -i -e 's|%define base_sublevel.*|%define base_sublevel $ENV{'BASE'}|' kernel-headers.spec

BASERELEASE=$(($BASERELEASE-1))

BASERELEASE=$BASERELEASE perl -p -i -e 's|%global baserelease.*|%global baserelease $ENV{'BASERELEASE'}|' kernel-headers.spec

if [ $RELEASED -eq 0 ]; then

	[ -n "$BUILDID" ] && sed -i -e 's/^# define buildid .local/%define buildid '$BUILDID'/' kernel-headers.spec

	RC=$RC perl -p -i -e 's|%global rcrev.*|%global rcrev $ENV{'RC'}|' kernel-headers.spec

	GITREV=$GITREV perl -p -i -e 's|%define gitrev.*|%define gitrev $ENV{'GITREV'}|' kernel-headers.spec

	rpmdev-bumpspec -c "Linux v$MAJORVER.$NEWBASE-rc$RC.git$GITREV" kernel-headers.spec

else

	STABLE=$STABLE perl -p -i -e 's|%define stable_update.*|%define stable_update $ENV{'STABLE'}|' kernel-headers.spec

	rpmdev-bumpspec -c "Linux v$MAJORVER.$BASE.$STABLE" kernel-headers.spec

fi

echo "Modified $CURRENTDIR/$PKGLOC/kernel-headers.spec"

echo "Don't forget to upload the sources"