# This file declares functions to install the kernel headers for linux

# Copyright 2007 Yann E. MORIN

# Licensed under the GPL v2. See COPYING in the root of this package

CT_DoKernelTupleValues() {

    if [ "${CT_ARCH_USE_MMU}" = "y" ]; then

        CT_TARGET_KERNEL="linux"

    else

    # Sometime, noMMU linux targets have a -uclinux tuple, while

    # sometime it's -linux. We currently have only one noMMU linux

    # target, and it uses -linux, so let's just use that. Time

    # to fix that later...

    #    CT_TARGET_KERNEL="uclinux"

        CT_TARGET_KERNEL="linux"

    fi

}

# Download the kernel

do_kernel_get() {

    local k_ver

    if [    "${CT_KERNEL_LINUX_INSTALL}" = "y"  \

         -a "${CT_KERNEL_LINUX_CUSTOM}" != "y"  \

       ]; then

        case "${CT_KERNEL_VERSION}" in

            ?*.?*.?*.?*)

                # 4-part version, we need only first three digits

                k_ver="${CT_KERNEL_VERSION%.*}"

                ;;

            *)  # 3-part version, use all of it

                k_ver="${CT_KERNEL_VERSION}"

                ;;

        esac

        CT_GetFile "linux-${CT_KERNEL_VERSION}"                             \

                   http://ftp.{de.,eu.,}kernel.org/pub/linux/kernel/v2.6    \

                   http://ftp.{de.,eu.,}kernel.org/pub/linux/kernel/v2.6/longterm/v${k_ver}

    fi

}

# Extract kernel

do_kernel_extract() {

    local tar_opt

    if [ "${CT_KERNEL_LINUX_INSTALL}" = "y" ]; then

        if [ "${CT_KERNEL_LINUX_CUSTOM}" = "y" ]; then

            # We extract the custom linux tree into a directory with a

            # well-known name, and strip the leading directory component

            # of the extracted pathes. This is needed because we do not

            # know the value for this first component, because it is a

            # _custom_ tree.

            # Also, we have to protect from partial extraction using the

            # .extracting and .extracted locks (not using .patching and

            # .patched as we are *not* patching that kernel).

            if [ -e "${CT_SRC_DIR}/.linux-custom.extracted" ]; then

                CT_DoLog DEBUG "Custom linux kernel tree already extracted"

                return 0

            fi

            CT_TestAndAbort "Custom kernel tree partially extracted. Remove before resuming" -f "${CT_SRC_DIR}/.linux-custom.extracting"

            CT_DoExecLog DEBUG touch "${CT_SRC_DIR}/.linux-custom.extracting"

            CT_DoExecLog DEBUG mkdir "${CT_SRC_DIR}/linux-custom"

            case "${CT_KERNEL_LINUX_CUSTOM_TARBALL}" in

                *.tar.bz2)      tar_opt=-j;;

                *.tar.gz|*.tgz) tar_opt=-z;;

                *.tar)          ;;

                *)              CT_Abort "Don't know how to handle '${CT_KERNEL_LINUX_CUSTOM_TARBALL}': unknown extension";;

            esac

            CT_DoLog EXTRA "Extracting custom linux kernel"

            CT_DoExecLog ALL tar x -C "${CT_SRC_DIR}/linux-custom"      \

                                 --strip-components 1 -v ${tar_opt}     \

                                 -f "${CT_KERNEL_LINUX_CUSTOM_TARBALL}"

            CT_DoExecLog ALL mv -v "${CT_SRC_DIR}/.linux-custom.extracting" "${CT_SRC_DIR}/.linux-custom.extracted"

        else

            CT_Extract "linux-${CT_KERNEL_VERSION}"

            CT_Patch "linux" "${CT_KERNEL_VERSION}"

        fi

    fi

}

# Wrapper to the actual headers install method

do_kernel_headers() {

    CT_DoStep INFO "Installing kernel headers"

    if [ "${CT_KERNEL_LINUX_INSTALL}" = "y" ]; then

        do_kernel_install

    else

        do_kernel_custom

    fi

    CT_EndStep

}

# Install kernel headers using headers_install from kernel sources.

do_kernel_install() {

    local kernel_path

    CT_DoLog DEBUG "Using kernel's headers_install"

    mkdir -p "${CT_BUILD_DIR}/build-kernel-headers"

    kernel_path="${CT_SRC_DIR}/linux-${CT_KERNEL_VERSION}"

    if [ "${CT_KERNEL_LINUX_CUSTOM}" = "y" ]; then

        kernel_path="${CT_SRC_DIR}/linux-custom"

    fi

    V_OPT="V=${CT_KERNEL_LINUX_VERBOSE_LEVEL}"

    CT_DoLog EXTRA "Installing kernel headers"

    CT_DoExecLog ALL                                    \

    make -C "${kernel_path}"                            \

         O="${CT_BUILD_DIR}/build-kernel-headers"       \

         ARCH=${CT_ARCH}                                \

         INSTALL_HDR_PATH="${CT_SYSROOT_DIR}/usr"       \

         ${V_OPT}                                       \

         headers_install

    if [ "${CT_KERNEL_LINUX_INSTALL_CHECK}" = "y" ]; then

        CT_DoLog EXTRA "Checking installed headers"

        CT_DoExecLog ALL                                    \

        make -C "${kernel_path}"                            \

             O="${CT_BUILD_DIR}/build-kernel-headers"       \

             ARCH=${CT_ARCH}                                \

             INSTALL_HDR_PATH="${CT_SYSROOT_DIR}/usr"       \

             ${V_OPT}                                       \

             headers_check

    fi

    # Cleanup

    find "${CT_SYSROOT_DIR}" -type f                        \

                             \(    -name '.install'         \

                                -o -name '..install.cmd'    \

                                -o -name '.check'           \

                                -o -name '..check.cmd'      \

                             \)                             \

                             -exec rm {} \;

}

# Use custom headers (most probably by using make headers_install in a

# modified (read: customised) kernel tree, or using pre-2.6.18 headers, such

# as 2.4). In this case, simply copy the headers in place

do_kernel_custom() {

    local tar_opt

    CT_DoLog EXTRA "Installing custom kernel headers"

    mkdir -p "${CT_SYSROOT_DIR}/usr"

    cd "${CT_SYSROOT_DIR}/usr"

    if [ "${CT_KERNEL_LINUX_CUSTOM_IS_TARBALL}" = "y" ]; then

        case "${CT_KERNEL_LINUX_CUSTOM_PATH}" in

            *.tar)      ;;

            *.tgz)      tar_opt=--gzip;;

            *.tar.gz)   tar_opt=--gzip;;

            *.tar.bz2)  tar_opt=--bzip2;;

            *.tar.lzma) tar_opt=--lzma;;

        esac

        CT_DoExecLog ALL tar x ${tar_opt} -vf ${CT_KERNEL_LINUX_CUSTOM_PATH}

    else

        CT_DoExecLog ALL cp -rv "${CT_KERNEL_LINUX_CUSTOM_PATH}/include" .

    fi

}