#!/bin/bash
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#
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# Copyright (C) 2013 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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### Usage: generate_uapi_headers.sh [<options>]
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###
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### This script is used to get a copy of the uapi kernel headers
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### from an android kernel tree and copies them into an android source
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### tree without any processing. The script also creates all of the
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### generated headers and copies them into the android source tree.
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###
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### Options:
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### --skip-generation
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### Skip the step that generates all of the include files.
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### --download-kernel <VERSION>
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### Automatically create a temporary git repository and check out the
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### linux kernel source code for the given version.
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### --use-kernel-dir <DIR>
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### Do not check out the kernel source, use the kernel directory
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### pointed to by <DIR>.
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### --verify-modified-headers-only <DIR>
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### Do not build anything, simply verify that the set of modified
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### kernel headers have not changed.
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# Terminate the script if any command fails.
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set -eE
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TMPDIR=""
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ANDROID_DIR=""
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KERNEL_VERSION=""
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KERNEL_REPO="git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git"
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KERNEL_DIR=""
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KERNEL_DOWNLOAD=0
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ARCH_LIST=("arm" "arm64" "mips" "x86")
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ANDROID_KERNEL_DIR="external/kernel-headers/original"
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SKIP_GENERATION=0
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VERIFY_HEADERS_ONLY=0
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function cleanup () {
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if [[ "${TMPDIR}" =~ /tmp ]] && [[ -d "${TMPDIR}" ]]; then
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echo "Removing temporary directory ${TMPDIR}"
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rm -rf "${TMPDIR}"
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TMPDIR=""
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fi
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}
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function usage () {
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grep '^###' $0 | sed -e 's/^###//'
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}
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function copy_hdrs () {
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local src_dir=$1
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local tgt_dir=$2
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local dont_copy_dirs=$3
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mkdir -p ${tgt_dir}
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local search_dirs=()
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# This only works if none of the filenames have spaces.
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for file in $(ls -d ${src_dir}/* 2> /dev/null); do
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if [[ -d "${file}" ]]; then
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search_dirs+=("${file}")
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elif [[ -f "${file}" ]] && [[ "${file}" =~ .h$ ]]; then
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cp ${file} ${tgt_dir}
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fi
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done
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if [[ "${dont_copy_dirs}" == "" ]]; then
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for dir in "${search_dirs[@]}"; do
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copy_hdrs "${dir}" ${tgt_dir}/$(basename ${dir})
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done
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fi
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}
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function copy_if_exists () {
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local check_dir=$1
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local src_dir=$2
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local tgt_dir=$3
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mkdir -p ${tgt_dir}
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# This only works if none of the filenames have spaces.
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for file in $(ls -d ${src_dir}/* 2> /dev/null); do
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if [[ -f "${file}" ]] && [[ "${file}" =~ .h$ ]]; then
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# Check that this file exists in check_dir.
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header=$(basename ${file})
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if [[ -f "${check_dir}/${header}" ]]; then
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cp ${file} ${tgt_dir}
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fi
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fi
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done
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}
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function verify_modified_hdrs () {
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local src_dir=$1
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local tgt_dir=$2
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local kernel_dir=$3
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local search_dirs=()
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# This only works if none of the filenames have spaces.
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for file in $(ls -d ${src_dir}/* 2> /dev/null); do
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if [[ -d "${file}" ]]; then
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search_dirs+=("${file}")
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elif [[ -f "${file}" ]] && [[ "${file}" =~ .h$ ]]; then
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tgt_file=${tgt_dir}/$(basename ${file})
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if [[ -e ${tgt_file} ]] && ! diff "${file}" "${tgt_file}" > /dev/null; then
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if [[ ${file} =~ ${kernel_dir}/*(.+) ]]; then
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echo "New version of ${BASH_REMATCH[1]} found in kernel headers."
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else
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echo "New version of ${file} found in kernel headers."
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fi
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echo "This file needs to be updated manually."
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fi
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fi
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done
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for dir in "${search_dirs[@]}"; do
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verify_modified_hdrs "${dir}" ${tgt_dir}/$(basename ${dir}) "${kernel_dir}"
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done
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}
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trap cleanup EXIT
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# This automatically triggers a call to cleanup.
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trap "exit 1" HUP INT TERM TSTP
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while [ $# -gt 0 ]; do
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case "$1" in
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"--skip-generation")
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SKIP_GENERATION=1
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;;
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"--download-kernel")
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if [[ $# -lt 2 ]]; then
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echo "--download-kernel requires an argument."
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exit 1
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fi
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shift
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KERNEL_VERSION="$1"
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KERNEL_DOWNLOAD=1
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;;
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"--use-kernel-dir")
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if [[ $# -lt 2 ]]; then
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echo "--use-kernel-dir requires an argument."
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exit 1
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fi
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shift
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KERNEL_DIR="$1"
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KERNEL_DOWNLOAD=0
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;;
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"--verify-modified-headers-only")
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if [[ $# -lt 2 ]]; then
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echo "--verify-modified-headers-only requires an argument."
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exit 1
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fi
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shift
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KERNEL_DIR="$1"
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KERNEL_DOWNLOAD=0
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VERIFY_HEADERS_ONLY=1
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;;
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"-h" | "--help")
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usage
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exit 1
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;;
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"-"*)
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echo "Error: Unrecognized option $1"
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usage
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exit 1
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;;
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*)
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echo "Error: Extra arguments on the command-line."
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usage
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exit 1
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;;
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esac
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shift
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done
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ANDROID_KERNEL_DIR="${ANDROID_BUILD_TOP}/${ANDROID_KERNEL_DIR}"
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if [[ "${ANDROID_BUILD_TOP}" == "" ]]; then
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echo "ANDROID_BUILD_TOP is not set, did you run lunch?"
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exit 1
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elif [[ ! -d "${ANDROID_KERNEL_DIR}" ]]; then
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echo "${ANDROID_BUILD_TOP} doesn't appear to be the root of an android tree."
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echo " ${ANDROID_KERNEL_DIR} is not a directory."
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exit 1
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fi
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src_dir="linux-stable"
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if [[ ${KERNEL_DOWNLOAD} -eq 1 ]]; then
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TMPDIR=$(mktemp -d /tmp/android_kernelXXXXXXXX)
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cd "${TMPDIR}"
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echo "Fetching linux kernel source ${KERNEL_VERSION}"
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git clone ${KERNEL_REPO}
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cd ${src_dir}
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git checkout tags/"${KERNEL_VERSION}"
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KERNEL_DIR="${TMPDIR}"
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elif [[ "${KERNEL_DIR}" == "" ]]; then
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echo "Must specify one of --use-kernel-dir or --download-kernel."
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exit 1
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elif [[ ! -d "${KERNEL_DIR}" ]] || [[ ! -d "${KERNEL_DIR}/${src_dir}" ]]; then
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echo "The kernel directory $KERNEL_DIR or $KERNEL_DIR/${src_dir} does not exist."
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exit 1
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else
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cd "${KERNEL_DIR}/${src_dir}"
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fi
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if [[ ${VERIFY_HEADERS_ONLY} -eq 1 ]]; then
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# Verify if modified headers have changed.
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verify_modified_hdrs "${KERNEL_DIR}/${src_dir}/include/scsi" \
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"${ANDROID_KERNEL_DIR}/scsi" \
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"${KERNEL_DIR}/${src_dir}"
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exit 0
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fi
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if [[ ${SKIP_GENERATION} -eq 0 ]]; then
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# Clean up any leftover headers.
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make distclean
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# Build all of the generated headers.
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for arch in "${ARCH_LIST[@]}"; do
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echo "Generating headers for arch ${arch}"
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make ARCH=${arch} headers_install
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done
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fi
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# Completely delete the old original headers so that any deleted/moved
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# headers are also removed.
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rm -rf "${ANDROID_KERNEL_DIR}/uapi"
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mkdir -p "${ANDROID_KERNEL_DIR}/uapi"
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cd ${ANDROID_BUILD_TOP}
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# Copy all of the include/uapi files to the kernel headers uapi directory.
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copy_hdrs "${KERNEL_DIR}/${src_dir}/include/uapi" "${ANDROID_KERNEL_DIR}/uapi"
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# Copy the staging files to uapi/linux.
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copy_hdrs "${KERNEL_DIR}/${src_dir}/drivers/staging/android/uapi" \
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"${ANDROID_KERNEL_DIR}/uapi/linux" "no-copy-dirs"
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# Remove ion.h, it's not fully supported by the upstream kernel (see b/77976082).
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rm -f "${ANDROID_KERNEL_DIR}/uapi/linux/ion.h"
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# Copy the generated headers.
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copy_hdrs "${KERNEL_DIR}/${src_dir}/include/generated/uapi" \
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"${ANDROID_KERNEL_DIR}/uapi"
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for arch in "${ARCH_LIST[@]}"; do
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# Copy arch headers.
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copy_hdrs "${KERNEL_DIR}/${src_dir}/arch/${arch}/include/uapi" \
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"${ANDROID_KERNEL_DIR}/uapi/asm-${arch}"
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# Copy the generated arch headers.
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copy_hdrs "${KERNEL_DIR}/${src_dir}/arch/${arch}/include/generated/uapi" \
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"${ANDROID_KERNEL_DIR}/uapi/asm-${arch}"
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# Special copy of generated header files from arch/<ARCH>/generated/asm that
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# also exist in uapi/asm-generic.
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copy_if_exists "${KERNEL_DIR}/${src_dir}/include/uapi/asm-generic" \
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"${KERNEL_DIR}/${src_dir}/arch/${arch}/include/generated/asm" \
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"${ANDROID_KERNEL_DIR}/uapi/asm-${arch}/asm"
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done
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# The arm types.h uapi header is not properly being generated, so copy it
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# directly.
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cp "${KERNEL_DIR}/${src_dir}/include/uapi/asm-generic/types.h" \
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"${ANDROID_KERNEL_DIR}/uapi/asm-arm/asm"
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# Verify if modified headers have changed.
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verify_modified_hdrs "${KERNEL_DIR}/${src_dir}/include/scsi" \
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"${ANDROID_KERNEL_DIR}/scsi" \
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"${KERNEL_DIR}/${src_dir}"
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echo "Headers updated."
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